TABLE OF CONTENTS - INTRODUCTION

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2 TABLE OF CONTENTS - INTRODUCTION I. Intrductin... MZ 5C Imprtant Infrmatin... The Mnitr MZ... Technical Specificatins... 4 Getting Started... 5 Receiving, Opening, Strage... 5 II. Installatin & Technical... 5 Lcatin... 5 Munting... 6 Using MZS t Prduce DHW... 6 Cndensate... 7 Charging & Leak Testing... 7 Crrsin... 8 Freeze Prtectin... 8 Gas Piping... 8 Prpane Cnversin... 8 Venting... 0 Electrical Start Up... 6 Flw Verificatin... 6 III. Accessries... 7 BS Indirect Water Tank... 7 Dmestic Ht Water Kit... 8 MZ Md Cntrl... 8 IV. Maintenance... 9 V. Trubleshting... 9 VI. Appendix A... Piping schematics... Wiring schematics... 6 VII. Appendix B... 9 Parts and Assembly drawings... 9 VIII.Warranty I. I N T R O D U C T I O N! FOR YOUR SAFETY! This prduct must be installed and serviced by a prfessinal service technician, qualified in hydrnic heating system installatin and maintenance. Imprper installatin and/r peratin culd create carbn mnxide gas in flue gases which culd cause serius injury, prperty damage, r death. Imprper installatin and/r peratin will vid the warranty.! WARNING! If the infrmatin in this manual is nt fllwed exactly, a fire r explsin may result causing prperty damage, persnal injury r lss f life. D nt stre r use gasline r ther flammable vaprs and liquids in the vicinity f this r any ther appliance.! WHAT TO DO IF YOU SMELL GAS! D nt try t light any appliance. D nt tuch any electrical switch; d nt use any phne in yur building. Immediately call yur gas supplier frm a nearby phne. Fllw the gas supplier s instructins. If yu cannt reach yur gas supplier, call the fire department. Prducts that have earned the Energy Star are designed t prtect the envirnment thrugh superir energy efficiency. ISO 900 registered. Apprved by AGA, CGA, CSA, IAS, CE and several state and municipal apprvals. - I M P O R T A N T I N F O R M A T I O N The purpse f this manual is t prvide a useful reference fr cntractrs, distributrs, engineers, architects, building wners, and thse cnsidering the use f this heating system. heat. N ther cntrls r mixing valves are needed fr lw temp applicatins. The MZ s design simplifies multi-temp, multi-zne applicatins.. There is n lw temperature return limit. This means that NO SYSTEM / THERMAL SHOCK PROTECTION IS REQUIRED. The MZ is a fully cndensing heating system. The clder the return water, the mre cndensing actin, the mre efficient. 4. When using the MZ fr dmestic ht water (DHW) r ther pririty applicatin, use ur MZ DHW kit, part # 95. It makes cmbining different temps fr heat and DHW r ther applicatins quick and easy. Our 5, 40, 50 and 80 galln BS tanks are perfectly matched t MZs.. The heat exchanger is stainless steel. 5. MZ heating systems are cmpletely self-cntained. Circulatr pump, air eliminatr, lw water cut ff, pressure relief valve, cndensate trap and drain, return water strainer, temperature/pressure gauge, fill/ drain valve, n/ff & summer/winter switch, manual flw bypass, and, except fr the MZ40C, an expansin tank big enugh fr a 5 galln system. Yu will nt shck, warp, crrde, r therwise harm it with temperature r rapid temperature changes. N primary/secndary piping arrangements are needed t prtect the heating system frm lw-temp. peratin. Yu can size the heating system t the heat lss f the structure. This is imprtant when the structure has been imprved ver the years but the riginal radiatin remains, permitting lwer perating temps at high efficiency and cmfrt levels. 6. Three vent systems available:.) Parallel CPVC - separated exhaust & inlet air.) Hrizntal cncentric. An adjustable cntrl knb n the unit, frm 65º t 76º F, cntrls the utging water temperature limit fr the main MZ INSTALLATION & MAINTENANCE.) Vertical cncentric Fr mst new and retr-residential jbs, there are n ther

3 INTRODUCTION cmpnents t buy in rder t supply heat t the distributin system. The MZ is a mechanical rm n the wall. Labr savings are dramatic. 8. MZ Heating System facts: If a system is designed with a run temperature f F, extra radiatin may be needed since the MZ is nt designed fr such high temperatures. 7. The MZ is wall hung, zer clearance, and direct vent (uses n rm air). It can be munted almst anywhere; abve the washer / dryer in the laundry rm, in a pantry, bathrm, clset, kitchen - yu name it. Because it has n ftprint, it is extremely valuable in cnds and apartments. Lngest successful histry f reliability f all high efficiency, fully cndensing heating systems. ISO 900 certified. Perfect fr radiant heating. EPA Energy-star listed. CSA Listed fr Canada & US. The rest f this manual shuld give yu all the infrmatin needed t prperly plan, install, maintain and service this state f the art, ultra high efficiency heating system. THE MONITOR MZ 5C Cmbustin air intake via cncentric flue husing. Flue gas utlet. Extremely reliable spark ignitr Pre-mixing stainless steel burner. Flame inspectin prt (visible frm cabinet dr). Air flw prving switch. 7-watt nearly silent air inlet cmbustin turbine. Hneywell gas valve. Cast aluminum water jacket. Heat exchanger exhaust utlet. Stainless steel finned-tubed heat exchanger. Cnvenient tapping fr flue gas measurement. Rubber gasket fr cabinet seal Pressure relief valve. System water temperature/pressure indicatr. Adjustable system water temperature cntrl. Water prving flw switch. Electrical interface panel fr thermstat & husehld pwer. Gas inlet pipe. On/Off switch. Grundfs 54 -speed circulatr pump. Summer/Winter switch. Expansin-tank NOTE: Easyff expansin tank cnnectin. (Typical f quick piping cnnectins and extremely easy parts access thrughut.) Air Eliminatr- NOTE: Air vent n tp is fully serviceable withut need t drain system. Cndensate trap. Stainless steel fill & drain ball valve. Grmmets fr electrical wiring. Heating system supply water utlet frm belw (cnnectin in back). System return water inlet with stainless steel strainer t prevent clgging.

4 INTRODUCTION T E C H N I C A L S P E C I F I C A T I O N S MODEL MZ5C MZ40C MZ5S BTU input 94,500 (Shwn Abve) 7,000 / 4,000 94,500 AFUE Efficiency 9 t 97% 9 t 97% 9 t 97% (depending n return water temp.) (depending n return water temp.) (depending n return water temp.) Built-in Cntrls & Functins Pririty pumped hi-temp circuit (fr DHW r heat) Pririty pumped hi-temp circuit (fr DHW r heat) Intergal DHW tank with seperate aquastat Dimensins 0" H x " W x " D 0" H x " W x " D 0" H x " W x " D Weight 5 lbs. 60 lbs. 60 lbs. Vent Length Vent runs lnger than.5 feet derate input by % per 0 feet. Cntact MPI if run is t exceed 0 feet. Fuel (see pg. ) Each MZ is factry tuned fr natural gas, but prpane kit is included. Cnversin takes abut 5 minutes. Q U I C K R E F E R E N C E Heating value H 60 F / 5.5 C BTU/ft CO/ CO Inlet Pressure (IWC) Gas flw (cf per F Air Reducer in /mm Gas Orifice in /mm P (utlet pressure, IWC) Air Pressure Switch Differential Heat Input (BT_U / _HR) MODEL NATURAL GAS LP GAS MZ 5 MZ 40 BOTH MZ 5 MZ 40 MZ 5 MZ 40 MZ 5 MZ 40 MZ 5 MZ 40 MZ 5 MZ 40 MZ 5 MZ 40 MZ ppm / 9.5% 50 ppm / 0.7% 7.0".0"/" " / 9mm Nne 0.8" / 5.8mm Nne.8".8".57" IWC.79" IWC 94,500 Tw Stage 7,000 / 7,000 Each "/mm Nne 0.8"/.5mm 0.65"/4.mm 5.50".8".57" IWC.79" IWC 94,500 Tw Stage 7,000 / 7,000 Each MZ 40 MZ 5S Dmestic Ht Water Flw Rate Delta 54 F (0 GAL/MIN Cmbustin Prducts MZ 5 SERIES: Max temperature: 76 F (80 C). Flw rate F (0 C) 4.7 PSI (0 mbar): 0 ft/h - 4 m h. Minimum System Water Flw Rate MZ 5C and M5S:.5 GAL/MIN MZ 40C 4.5 GAL/MN MZ 40 SERIES: Max temperature: 76 F (80 C). Flw rate F (0 C) 4.7 PSI (0 mbar): 084 ft/h - 59 m h. Water Pressure Heating pressure: maximum 4.5 PSI ( bars) minimum 4.5 PSI ( bar) Ht water pressure: maximum 87 PSI (6 bars) Water capacity f expansin tank n MZ5C/S 6 galln system capacity Maximum Operating Flw Temperature Nminal 80 F (80 C). Water capacity f: MZ5C.5 gallns MZ5S 6.50 gallns MZ40C.5 gallns Electrical Supply 0V -60Hz -5AMP MZ INSTALLATION & MAINTENANCE I N F O R M A T I O N 4

5 INTRODUCTION - INSTALLATION AND TECHNICAL GETTING STATED aut fill valve if ne is required r as the apprpriate place t cnnect additinal expansin tank, if needed. If nt needed, cap it. If yu are ging t use it, check t make sure that the pening in the male prt has been drilled ut. RECEIVING: Befre the cntractr accepts the MZ, care shuld be taken t verify that it has suffered n shipping damage. MPI cannt cver shipping damage. Trucking cmpanies refuse t cver hidden damage if the damage is nt claimed immediately. All f the parts inside the MZ s cver are imprtant and shuld be carefully guarded during the time between unpacking the MZ and installing it. The gaskets that are part f the cnnectin kit are easy t misplace. Please put them in a safe place until ready fr installatin. The MZ is externally prtected by fam inserts, a plastic bag and cardbard crner braces. Between the fam prtectr fr the tp f the MZ and the cartn is a steel munting rail that is frmed t match the munting rail n the back f the MZ. Cmbusin air in OPENING THE MZ: The frnt cver f the MZ is sealed against the back with a rubber gasket. With the cver n, the interir f the MZ becmes a plenum. The cver is held at the tp by a munting lip frm which it hangs. The bttm f the cver is fitted with tw clips that snap clsed arund the bttm f the back. These clips are secured with tw screws that hld the clips in place. Remve the screws s the cver can be remved. Replace them when the installatin is cmplete. Prducts f cmbustin ut Cncentric flue illustrated here. Pipe must be extended t utside f structure. STORAGE: If the MZ will nt be installed right away it shuld be inspected and then stred in a secure, dry lcatin. INSIDE THE COVER OF THE MZ ARE: Installatin instructins LP cnversin kit and instructins A cntainer f BIONIBAL crrsin inhibitr A set f unin elbws and gaskets fr cnnecting the MZ water and gas piping Tw () service drivers. Yu will ntice that ne f the heating systems J pipes has an extra /4" male prt n it. This can be used fr the return f the Dmestic Ht Water r high temperature circuit, as well as an Cmbustin chamber Cndensate cllectin II. INSTALLATION AND TECHNICAL CHOOSING A LOCATION: the MZ s heat exchanger r be carried int the cndensate trap. Sme airbrne substances that can be encuntered in the residential and light cmmercial applicatins that the MZ is cmmnly used in can cause premature failure f cmpnents vital t the MZ s functin. The MZ s cmbustin air must be free f chlrine, flurine, brmine, acids, cleaning cmpunds, slvents, metal dusts, metal fumes and air cntaminated with the gasses prduced in animal cnfinement buildings. When chsing a lcatin t munt the MZ, run length f the venting may be the primary factr, since it has the mst limiting factrs and, in the case f the cncentric type, it can be expensive. The ther factrs are prximity t existing r prpsed piping and gas lines, as well as a cndensate drain. It is usually easier t run lnger piping and gas lines than it is t have a far reaching and multi-elbwed vent system. The MZ shuld never be munted utdrs pen t the weather. A sheltered utdr lcatin is OK, but freeze prtectin f the cndensate trap and drain and f the circulating fluid will be necessary in cld climate znes. Take special care t avid chlrine fumes such as frm muriatic acid cmmnly used fr cncrete cleaning. Special care shuld be given t MZ installatins that are near swimming pls, laundries, beauty parlrs, dry cleaners, metal wrking peratins, metal treating peratins, industrial plants, autmbile r diesel peratins, and animal cnfinement facilities. The munting wall shuld be sund and dry. Wall anchrs can be used fr masnry; screws fr wd and carriage blt fr metal frames. If the wall is stne r very uneven, a pair f x4s frm the flr t the ceiling jists wrks fine. Be sure t leave clearance fr the vent if vent is exiting straight ut the rear. The MZ is very quiet and is rated fr zer clearance t cmbustibles. It requires n special utility rm r fireprfing fr its lcatin. It can be put in living spaces, pantries, bathrms r clsets. Since it is sealed cmbustin, it des nt need any indr air surce f any kind thugh indr air Clean cmbustin air is necessary fr prper peratin f MZ units. Sme dust will be brught int the MZ and will burn in the flame. Sme f the ash prduced will cling t the fins f 5

6 INSTALLATION AND TECHNICAL fr cmbustin is apprved if Natinal Fuel Gas Cde requirements are fllwed. Utilizing indr air can cause a decrease in the verall system efficiency. The MZ shuld nt be run where ambient temperatures exceed 5 F. When the time cmes fr the heating system, simply remve the plugs, hang the MZ, tighten the unin nuts that cnnect the MZ t the piping and fill the unit. Preplumbing spares yu the wrry (and cash flw) f having the heating system sit n the jb site ut f yur cntrl while cnstructin ges n. Thirty minutes shuld be all yu need frm delivery t light ff. MOUNTING THE MZ: The MZ cmes frm the factry with a wall munt bracket, gas and water pipes. With this methd yu must: Munt the bracket securely, hang the MZ, attach the included turn-dwn elbws and begin piping. Nte that when the caps that cver the nipples n the heating system are remved, it is nrmal t find water left ver frm the test-run firing at the factry. Watch ut fr black-water staining if yu are wrking in a clean area. Always flush the heating system with plenty f clean water befre cmmissining. There are times when the rugh piping fr the heating system must be installed and pressure tested befre the heating system is actually needed. The pre-plumbed wall bracket was designed fr this scenari. Nte that the pre-plumbed brackets cme with and dmestic cld water shut-ff valves n the 5S. The pre-plumbed bracket (part #95 fr MZ5C pictured at right, #95 - MZ40C and #95 fr MZ5S) allws cmpletin f the heating and dmestic water piping withut the heating system present. NOTE: All MZ heating systems are shipped with an ffset Z bracket fr flush munting. The #955 Spacer Back Plate fr MZ5C & the #956 Spacer Back Plate fr MZ5S and MZ40C allw piping t be run up behind the unit. Pre-plumbed brackets can be a big help with radiant systems n new cnstructin r majr remdel jbs. Fit the bracket, pipe the gas and heat, use standard pipe plugs with the supplied fiber gaskets t pressure test the entire system. USING MZS TO PRODUCE DOMESTIC HOT WATER: a 54º F temperature rise. That is a cnstant draw f 74 gallns per hur. That setting maximizes efficiency and DHW prductin, and wrks fine fr a ne-shwer applicatin. SIZING: As lng as the BTU utput f the MZ is greater than the design heat lss f the structure, the DHW draw n the MZ des nt have t be taken int accunt because DHW run times are very shrt. The nly time that DHW lads affect sizing is when they are unusually large. The tank n the right side f the MZ5S inside its cver hlds system water. A cpper fin-tub cil inside the tank transfers heat frm system water t dmestic water. The adjustable aquastat just abve and t the left f the tank sets the limit fr the DHW-water temperature. We recmmend a setting f n mre than 0. If the DHW aquastat is set abve 45º F the fixed, manual-reset high-limit supply-water thermstat n the MZ may trip, causing nuisance callbacks. INDIRECT: Because f its very high efficiency and very quick respnse time, the MZ series is especially well suited fr high-vlume DHW water prductin thrugh the use f water strage tanks using the heat prduced by the MZ. Our 5, 40, 50 and 80 galln stainless tanks are designed with the cntractr, the end-user and the MZ in mind. The temperature f DHW is independently cntrlled and regulated by adjustable settings n the MZ5S. The MZ5S als includes an adjustable flw setting device fr DHW. In mixed space-heat DHW applicatins, the DHW functin is given pririty ver space heat thrugh the use f a three-way valve r pririty pump system cntrlled t direct 00% f the MZ s utput t the heat exchanger in the DHW system. When there is a lw DHW flw thrugh the MZ5S, the system water in the tank will give up heat t the DHW and its temperature will fall until the aqustat clses. The MZ will add heat t the tank at faster rate than it is being taken ut, and the temperature in the tank and in the DHW will rise until the aquastat is satisfied. Then the temperature will start t fall again until the aquastat calls fr heat again. This situatin presents little r n prblem fr laundry, dishwashing, hand washing r ther cmmn DHW uses. DIRECT DOMESTIC HOT WATER, THE MZ 5S: The MZ 5S prvides space-heat and DHW at extremely high levels f efficiency and lw levels f pllutin. It is especially well suited fr structures in which flr space is at a premium. The MZ 5S will prduce.9 GPM f dmestic-ht-water at MZ INSTALLATION & MAINTENANCE 6

7 INSTALLATION AND TECHNICAL CONDENSATE: Fr steady water temperatures, the DHW water flw rate thrugh the MZ5S must be high enugh t keep the MZ s burner n. If the user cmplains f DHW temperature swings, especially in the shwer, install a thermstatic mixing valve between the ht and cld legs f the system. Make sure it is a thermstatic, nt a tempering valve. Als make sure that the temperature setting f the MZ5S is at least 5 abve the desired mix temperature f the thermstatic valve (even if it means a higher than needed gpm valve is used), r there may be temperature fluctuatins. Cndensate remval can be accmplished by letting it drain int the building s nrmal drain r septic system. The MZ s cndensate utput depends n the return water temperature f the heating system. Clder return water means higher efficiency and mre cndensate. Over time cndensate will eat cncrete, irn and cpper drains. Mst drain water is alkaline which will neutralize cndensate. Perclating cndensate thrugh crushed limestne will neutralize it. If n gravity drain available, an acid-prf cndensate pump will d the jb. NOTE: The DHW perfrmance f the MZ5S is nt exactly like that f a regular ht water heater, s make sure that yu r yur custmer understand its limitatins. Filling a bathtub will take lnger, since mst wide pen spigts will nt yield ht enugh water fr a cmfrtable bath. The filling prcess will have t be slwed in rder t keep the temperature up. Make sure yur custmer knws this! If space is nt critical, it is almst always better t use an MZ 5C and ne f ur BS tanks. The cst f the tank and valves are little mre than the difference between the 5S and 5C. It has been ur experience that thse peple wh chse the MZ5S d s fr the exceptinally high efficiency fr verall DHW as cmpared t cnventinal standing-pilt, gravity-vented gas water heaters, and easily adjust t the subtle differences. CHARGING & LEAK TESTING: It is assumed that the system int which the MZ is being installed is a leak-free system. Leaks in the system will damage the heating system and vid the warranty. If there are leaks in the system, fresh water will have t be added t the system t replace the lst water. The additin f fresh water, ver time, will always bring air and disslved minerals int the heating system and will dilute the crrsin inhibitr. All f which will cause a failure. The prper cncentratin f BIONIBAL crrsin inhibitr (% by vlume fr all metal pipe systems and systems with xygen barrier tubing, % by vlume fr nn-barrier systems) that is shipped with the MZ will cmpletely prtect the MZ and the system it is cnnected t frm crrsin if kept at the right strength. BIONIBAL des nt deterirate ver time r get used up ver time. Additinal Binibal is available frm MPI. Table may be helpful in balancing MZ5S DHW systems. Table MZ5S Once the system is prperly charged with: Leaving water Temperatures, Degree F. Temp GPM Rise 5 F. 40 F. Inlet Inlet Water Water T e m p Temp F. Inlet Water Temp 5 50 F. Inlet Water Temp F. Inlet Water Temp F. Inlet Water Temp Water BIONIBAL, r Water, glycl BIONIBAL mixture, it shuld remain stable indefinitely. Befre the MZ is cnnected, the piping system shuld be filled with clean, neutral P-h water t a pressure f 00 PSI. If there is n change in pressure after 4 hurs, the system can be assumed t be leak-tight. The system shuld als be visually inspected as thrughly as pssible. If any leaks are fund, they must be repaired. The MZ has a brass, male-hse-thread, fill-and drain valve perated by a stainless-steel ball valve. We recmmend that the MZ nt be permanently piped t the structure s ptable water system, unless lcal cde requires aut fill. If aut-fill is installed t the system, ur recmmendatin is that it be turned ff. The flw switch in the MZ prevents lw-water firing. It is nrmal fr heating systems t lse a very small amunt f water ver time thrugh valve stems r similar fittings. This trivial amunt f water can easily be replenished during nrmal maintenance. There is a clear plastic tube in the MZ that fits ver the nzzle n the air vent and prevents the water that typically spits ut f the nzzle frm staining the inside f the MZ. APPROXIMATE DHW PERFORMANCE OF MZ5S AT VARYING FLOW RATES AND INLET WATER TEMPERATURES. ALL TEMPERATURES ARE IN FAHRENHEIT. First clumn gives flw in galln per minutes. At any steady gallns per minute (GPM) flw rate, the MZ will raise the temperature f the inlet water by a specific amunt. That temperature rise is shwn in the secnd clumn. On start up, the MZ shuld be run in the heating mde until the entire system is brught up t perating temperatures. Third, and subsequent clumns, gives inlet water temperature rising 5º F increments (tp rw) and the leaving dmestic ht water (DHW) temperature (remaining rws.) D nt leave city water pressure n the aut-fill during nrmal heating system peratin since any system leaks will cause the Binibal crrsin inhibitr t be diluted and eventually 7

8 INSTALLATION AND TECHNICAL eliminated. Oxygen and minerals in the water cming in t replace the water leaking ut will damage the MZ. CORROSION: The MZ shuld be filled with clean, clear, neutral ph water suitable fr drinking. A cleaning slutin such as a mixture f water and trisdium phsphate shuld be used in any systems with ily residues. Many chemicals have been used ver the years in existing heating systems that culd cause premature failure f MZ units. It is imprtant that n additives be used in the system water fr the MZ ther than BIONIBAL, which is supplied with each unit. IMPORTANT: The use f a % by vlume slutin f BIONIBAL in a radiant-heating system using nn-xygenbarrier tubing will prtect the MZ and the system t which it is cnnected, frm xygen crrsin. In a system using tubing with an effective, intact, xygen barrier r in a hard-piped system, a % slutin f BIONIBAL is sufficient. BIONIBAL desn t deterirate r weaken ver time, but shuld be renewed if system is drained. in an easily accessible place. The pipe supplying gas t the heating system must nt cause a pressure lss great enugh t decrease inlet gas pressure belw the specified minimum gas pressure values. (5" f water clumn fr natural gas, " fr LP.) After initial start up, check that the pressure tapping pints are prperly clsed and check the general leak tightness f the gas circuit. Always purge thrugh the gas pipe wrk befre initial firing f the unit (in rder t get rid f any particles prduced by welding r threaded jints). The unit and its individual shut-ff valve must be discnnected frm the gas supply piping system during any pressure testing f that system. EXAMPLE PIPE SIZING TABLE Fr gas flw thrugh varius pipe lengths and diameters. (FOR REFERENCE ONLY) Capacity f pipe fr pipe size (ft/hr) Pipe length (feet) /" /4" " /4" Under n circumstances shuld standard cmmercial antifreeze slutins be used in the MZ. Mst f them cntain crrsin inhibitrs that are nt apprved fr use in the MZ. They will cause heat exchanger failures that are nt cvered by warranty. N ther additives fr lubricatin, leak stppage r any ther purpse can be used in the MZ. T d s will vid all warranty. FREEZE PROTECTION: Nte: Table abve is fr natural gas with specific gravity 0.60 with a pressure drp thrugh the gas piping f 0.0" w.c. Refer t ANSI Z. fr additinal pipe sizing. In situatins where freeze prtectin is a necessity. MPI ships 5 galln quantities f BIONIBAGEL anti-freeze which is frmulated with Binibal at a cncentratin that will bring a 50/50 mix f BIONIBAL and water t a % cncentratin f BIONIBAGEL. If the applicatin des nt require a 50/50 mix, the additin f sufficient BIONIBAL t bring the resulting slutin t a % cncentratin is imprtant, therwise bacterial grwth and crrsin may take place. In nn-barrier systems, which we discurage, a % cncentratin f BIONIBAL must be assured. One quart (part # 956) and.6 galln (part #959) quantities f BIONIBAL are available frm MPI. NATURAL GAS TO LP GAS CONVERSION AND HIGH ALTITUDE ADJUSTMENT: Nte that the additin f glycls t the water passing thrugh the MZ changes the rate at which the mix absrbs and releases heat, decreasing its effectiveness as a heat transfer fluid. Glycls als increase the viscsity f the water, making it mre difficult t pump. These factrs can significantly influence the verall perfrmance f the heating system and shuld be taken int accunt in the system s design.. Recnnect nut and tighten.. Fr MZ5C/S mdels nly: Remve the cmbustin air fan by pulling it t the right. Discnnect the rubber air hse and the wiring. Set the fan aside. Nte: The split-ring LP rifice slips int the burner, as shwn belw. If it fits lsely, use the apprpriate tl t pen the split-ring LP rifice s that it hlds in place. 4. Inlet gas pressure fr LP gas must be between " and " water clumn with the heating system running. The MZ40C requires n gas valve change. The MZ5C/S requires a gas pressure adjustment frm the factry.8" water clumn setting t 5.5". The adjuster is under the sltted cap n the gas valve. Turn the adjustment screw underneath the cap full clckwise and then back ff ne turn cunter-clckwise. Replace cap. The heating system shuld then fire, permitting utlet pressure measurement. Repeat adjustments until the crrect utlet pressure f 5.5" is reached. The final pressure reading at tap P must be taken with the unit running and the cap reinstalled n the gas valve. NOTE: Many cmmnly used, unapprved crrsin inhibitrs CAN DAMAGE THE MZ AND VOID THE WARRANTY. MZ Heating System GAS PIPING: The supply line is /4" NPT, and enters at the lwer left side f the unit as shwn. The gas supply pipe must be fitted with a / 4 turn stp valve lcated MZ INSTALLATION & MAINTENANCE ÍGas Inlet Each MZ is supplied with a LP cnversin kit. Fllw steps fr cnversin frm Natural gas t LP:. Lsen the nut frm the gas line/burner junctin as shwn n next page (there are n the MZ40C). Insert rifice int gas line. Nte that since there is n natural gas rifice in the MZ40C, the tightening f the unin between the gas line and the elbw smetimes narrws the pening in the gas line fr the rifice. If that ccurs, ream the pening. Fr MZ40C LP heating systems, insert rifices befre munting heating system. 8

9 INSTALLATION AND TECHNICAL Imprtant nte abut altitude: Since atmsphere thins as altitude increases, there is less xygen available t supprt cmbustin at high altitude. The cmbustin-air blwer used n the MZ was designed specifically fr the MZ. Its nrmal perating speed is partly determined by the density f the air mving thrugh it. As altitude increases, the MZ s blwer spins easier and faster in- Cmbustin Chamber unit pressure ALTITUDE ADJUSTMENT DIAGRAM creasing the amunt f air. The MZ can be used up t 6,000 feet dependinc n vent length f run, aabve 6,000 feet, adjustment f the air-pressure switch is necessary. Gas rifice is lcated in gas-line side f unin. Spray unin with penetrating il and tap wrench t lcate nut n unin. Gas line may need t be reamed t accept LP rifice fr MZ40. Inizatin prbe Ignitin electrde Air pressure switch Air rifice lcatin Outlet pressure Air pressure switch test pint MZ5 Nat..8 MZ5 LP 5.5 MZ 40 Nat r LP.8 Pressure Tap P Gas pressure regulatr Inlet pressure must stay within 5 and 7 WC fr Natural Gas and and WC fr LP gas Ignitin acceleratr Slenid Servsystem Pressure Tap P Air fan Gas valve T avid pressure, remve cap, turn adjustment screw clckwise t increase, cunter clckwise t decrease. Cap must be n t measure. blckage is reached where CO des begin t ramp up, a very small increase in blckage makes a very large increase in CO. It is best t increase blckage VERY slwly.) Remve jumper wire frm switch. Burner will g ut and CO will begin t fall. ALTITUDE ADJUSTMENT ) Fire heating system. Let run fr five minutes. Measure and set CO at 0 PPM fr natural gas (50 PPM fr LP gas ). There is a tapping in the vent elbw inside the MZ s cabinet just t the left f the flue-gas exit frm the MZ fr flue gas measurement. Nte that the cap that cvers the gas valve s adjustment screw must be in place when CO measurement is made. 4) Adjust air pressure switch VERY, gradually cunter clckwise t the pint where the switch clses, which will then cause the burner t relight. ) Take cver ff f air-pressure switch. With heating system running, jump cntacts s that heating system cntinues t fire when switch pens. 5) Unblck blwer inlet air. 6) CO measurement shuld then return t 0 PPM fr natural gas ( 50 PPM fr LP.) Check t verify that CO is nrmal. ) Very, gradually blck inlet air t blwer with smething light and stiff, such as a credit card, until CO reads between 500 and 750 PPM. (NOTE: Blcking half f the blwer inlet may raise CO nly slightly. As the critical pint f 7) Replace terminal cver n air-pressure switch, replace plug in vent pipe, replace MZ cver. Cycle unit t verify nrmal peratin. 9

10 INSTALLATION AND TECHNICAL VENT KITS FOR MZ HEATING SYSTEM: MINIMAL STARTER KITS MP# #950 #95 The mst ecnmical venting lcatin fr the MZ is n r near enugh t an utside wall s that the vent bx that fits the tp left-hand side f the MZ is within 8" f the final terminatin pint f the vent run. (see Fig. ) Descriptin Page N. Hrizntal Flue Kit, Meter... Use part number 950 t prvide all the necessary parts fr r the abve venting ptin. Vertical Vent Kit... 4 HORIZONTAL CONCENTRIC BUILT-UP VENT SYSTEMS #950 Hrizntal Flue Kit, Meter... #950 Hrizntal Flue Kit,.5 Meter... #950 Hrizntal 90 Elbw... #9504 Hrizntal Meter Stick... #950 Flue Adapter t Plastic Run... VERTICAL CONCENTRIC BUILT-UP VENT SYSTEMS #9505 Vertical Flue Adapter... #06 Vertical Thrugh-Rf Terminal 5" lng... #0 Vertical -Meter Stick... #0 Vertical / Meter Stick... #04 Vertical 45 L... #90 Vertical 5-45 Rf Cler... #90 #90 #904 #05. Hrizntal Cncentric: 6 Maximum Fig. Minimum 6 clearance Overhang is.5 Intake pipe verhang MZ Heating System The MZ s hrizntal vent system can run straight back frm the MZ r right, left, r ver the tp f the MZ at 90º increments using the standard vent bx munting prcedure. Vents must slpe back t the heating system. A minimum drp f 5/8th inch per ft f hrizntal run must be prvided.. Vertical Cncentric: Fr vertical cncentric venting, Mnitr Prducts, Inc. kit number #9505 is required. (see fig. ). Fig. Vertical 5-55 Cllar, Black... Pipe Supprt Ring... Vertical Black-Plastic Ceiling Trim... Vertical 90 L (.44 meter) Intake adapter Adapter and gasket VENTING: The MZ is designed fr direct, cncentric venting, althugh it can be prperly vented in ther ways. The MZ is vented in basic ways.. Hrizntal Cncentric. Vertical Cncentric. Separated Exhaust & Inlet Air in " PVC Hrizntal vs. Vertical: The final terminal pint f the vent run determines which vent system shuld be used fr the MZ. THE SYSTEMS HAVE DIFFERENT DIMENSIONS AND CANNOT BE MIXED. The hrizntal system is less expensive than the vertical system, ft fr ft and fitting fr fitting. Fr vent runs in excess f 0 feet, cntact MPI. All length f runs must be accessible fr inspectin. MZ INSTALLATION & MAINTENANCE MZ Heating System Once the kit has been installed, the venting can be cntinued by way f utilizing different lengths f cncentric pipe, 90º elbws, and 45º elbws. Part numbers & descriptins shwn in Table. Vents must slpe back t the heating system. A minimum drp f 5/8th inch per ft f hrizntal run must be prvided. TABLE PART NUMBER CONCENTIC PIPE LENGTHS 0.65 Feet (. 5 Meter) 0. Feet ( Meter) 04 Vertical Vertical 90 0

11 INSTALLATION AND TECHNICAL After the area f terminatin has been selected use part number #06 and install vent terminatin utilizing supprt bracket included with kit. (See Fig. ) Fig A.5" X 9 Lng pipe CPVC Trim s that reducing bushing fits snug n tp f bx. Fig. " Cupling CPVC " Elbw, CPVC 4 f " CPVC pipe " X.5" Reducing bushing Lcking ring Bi-Directinal bx Gasket BI-DIRECTIONAL VENT KITS: USE FOR TWO PIPE APPLICATIONS ALLOWS FOR " PVC VENTING THIS ARRANGEMENT CAN BE TERMINATED THROUGH WALL LEFT, RIGHT, OR REAR Supprt bracket (included with kit) Terminatin f a vertical flue must prvide at least inches (0 cm) abve the rf jack t the cmbustin air intake cllar. If there are tw units in the installatin with vertical flue systems, the terminatin f the systems must be separated by 6 inches (40 cm). (See Fig.4) Fig. 4 0 cm - Minimum 40 cm 6 Minimum s mmuusstt. Separated Exhaust & Inlet Air in " PVC In a situatin where it is desirable t rute the venting in a nncncentric fashin, use part #950A as seen in Fig. 5. This kit will allw fr the exhaust t be piped independently f the intake. Drain slpe twards inside 5/8 per ft " Male threaded apapter CPVC The venting then can be cntinued in " PVC fr intake air, and " CPVC fr exhaust air. Terminatin then can be piped in a cnventinal manner. Inlet and utlet shuld be in the same wind plane. The flue/cmbustin air system piping shuld be installed bserving the fllwing criteria: Fr vent lengths in excess f 0 feet, cntact MPI Fr each 90º elbw used in the flue system, subtract. feet frm the ttal allwable length. Fr each 45º elbw used in the flue system, subtract.65 feet frm the ttal allwable length. Hrizntal runs f the flue system must pitch dwn 5/8" per ft f length twards the heating system t facilitate prper flue prducts cndensate drainage. Terminatin f a hrizntal flue system shall nt be less than 6 feet abve walkway. Take care t minimize the likelihd f flue/cmbustin air intake blckage. Vertical flues must intake and discharge abve the snw line. D nt place the flue terminal less than. feet frm a ventilatin hle r pening in a building. Terminatin shuld be at least feet abve the snw line. All flue-piping cmpnents must be assembled t prvide an airtight flue/cmbustin air system. Inspectin hatch screw 950 KIT FLUE 6% slpe back t system. 5/8 per ft f run. Dimensins Inches 5.4 A 4. B C mini D.76 E.64 F mm Flue gas utlet.95 (PP dia. 75) Air inlet 4. (PVC dia. 0) Intake pipe verhang

12 INSTALLATION AND TECHNICAL PVC dia. 0 Dia. 4. Psitining slt Plyprpylene dia. 75 Dia..95 The MZ can be supplied with a standard length flue, which can be used t run thrugh a wall up t three feet thick directly behind the MZ. Fr greater lengths, specify with yur rder. HORIZONTAL CONCENTRIC VENTING: SHORT VENT RUNS 905 Hrizntal Flue Kit Intake pipe - slides ver exhaust pipe 9.6 meter This arrangement recmmended fr vent runs shrter than 4 feet. This arrangement can be terminated thrugh wall left, right, r rear. This end is final wall terminatin End view (assembled) MZ Heating System HORIZONTAL CONCENTRIC VENTING: UP AND OVER LONG VENT RUNS 950 Exhaust elbw inside intake elbw 9504 Exhaust pipe inside intake pipe (cut length as needed) 950 Adapter and gasket 950 Still needed fr terminatin MZ Heating System DO NOT USE Nte: Direct cnnectin f # 950 MZ INSTALLATION & MAINTENANCE This arrangement recmmended fr vent runs lnger than 4 feet. Order lengths f 9504 t cmplete desired vent lengths.

13 INSTALLATION AND TECHNICAL 950A KIT FOR PVC VENTING CPVC Elbw.5 x CPVC Bushing " X 4 CPVC Stick Tp f heating system t Tp f Elbw,.75, Minimum.5 x CPVC Pipe. Trim s that Reducing Bushing Fits Snug n Tp f Bx " X " CPVC TO PVC Cupling. Remainder f Flue can be " PVC Retaining ring Fits Inside f Bx t secure Bushing. Cnnectin Bx Cmbustin Air Inlet Bushing. Bx t " PVC. Cmbustin Air Inlet Run Can be " PVC. Gasket Between Bx and Heating System Exterir Wall Flue gas ut Prducts f Cmbustin Out Cmbustin-air In Cap 8 Minimum Existing chase used fr flue and intake-air runs (fr instance, chimney, after cleaning). Cntinuus " PVC run fr intakeair is preferred, especially if very clean chase cannt be assured. DO NOT USE CHLORINATED CLEANERS FOR CHASE LEANING!!! Cmbustin air in. Flue gas ut. Cmbustin-air In Tw Ft Minimum, n Maximum Fundatin Wall NOTE: Inlet and utlet must be in same wind plane. Otherwise they can be any distance abve grade r frm each ther as lng as flue gas cannt reach inlet and as lng as the entire system meets the requirements f the Natinal Fuel Gas Cde. Cmbustin-air t MZ Sil r Snw Line All pipe " PVC. Cnnect t MPI s accessry #950 A, separated vent kit. Flue gas frm MZ CONCENTRIC FITTINGS FOR VERTICAL DISCHARGE VENTING Plyprpylene/PVC Cncentric - Vertical Terminal - Fr Flat r Slping Rf Cncentric Fittings Reference Clr 06 Length Black 4.5 I.D. O.D. Reference Angle I.D deg (80mm) (5mm) (080mm) (80mm) (5mm) Useful length under sleeve tile inches (0.4 m) 05 Extentin - Jint Fitting Sleeve Tile with Adaptable Cupling Reference Length 0 0 I.D. O.D (500mm) (80mm) (5mm) (80mm) (5mm) (000mm) Fastening cllar (each flue piece must be adequately supprted.) Useful length after assy inches (0.45 m) [0]r 7.4 Inches (0.95 m) [0] 90 deg Reference Slpe O.D (80mm) (5mm) 90 Diameter mm 4.9 (5mm) Cllare are essential t bear the weight f the vertical extensin. Plyprpylene Ceiling Plate t Cver Rugh Opening Cvering type Clr 5-45 deg Til Tile Red 5-55 deg SlateBlack Shingle Plyprpylene/PVC Cncentric Elbw -jint fitting Reference Reference Clr 904 Black

14 INSTALLATION AND TECHNICAL VERTICAL CONCENTRIC VENT These parts are needed t fit the vertical-vent system t the MZ. The internal flue pipe that ships with the MZ is sized fr the hrizntal flue system and side-by-side tw-pipe vent systems. They are used with the MZ mre ften than the vertical, cncentric vent system is. When the vertical-vent system is used, the MZ s inner vent pipe must be replaced with ne that matches the size used fr the vertical vent system 9505 Vertical Flue Adapter This Pipe replaces this pipe MZ HEATING SYSTEM 95 Vertical Vent Kit 9505 (See abve) and 9505 (See page ) Thrugh-rf terminal Pipe-supprt ring MZ HEATING SYSTEM Slpe Venting Back t System a Minimum 6% Grade (5/8 per ft) 6 Minimum 4. r (8mm) Intake Pipe Overhang Terminal must exit a minimum f 8 abve the snw line mandated by lcal cde r Natinal Fuel Gas Cde. MZ INSTALLATION & MAINTENANCE 4 MZ HEATING SYSTEM

15 INSTALLATION AND TECHNICAL Exterir Wall Part 950, Hrizntal 90 Degree Elbw Part 9504, Hrizntal I-meter Stick, Cut t Length if Necessary Part 950, Hrizntal Flue Terminatin Kit, Cut t Length Prducts f Cmbustin Out Terminal Must Exit at the Depth Abve snw Line Cmbinatin Air In Mandated by Lcal Cdes f Natinal Fuel Gas Cde. Fundatin Wall Abve Grade Part 950, Flue Adaptr t Plastic Run Ntes: All flue parts are cncentric. They exhaust the prducts f cmbustin thrugh a nminal.7 pipe that is enclsed and supprted within a nminal 4 pipe. The 4 cnveys cmbustin air back t the MZ. Snw Line MZ HEATING SYSTEM All flue-pipe cnnectin are gasketed slip-fit. It is recmmended that a lubricant such as sapy water be used t facilitate the slip-fit cnnectin. The male end f each cnnectin shuld be inserted int the crrespnding female end until it bttms ut. All flue cmpnents shuld drain back t the MZ. The MZ an all f its flue parts are zer-clearance t cmbustibles. If the terminal pint f the MZ as shwn in this drawing is belw the lcal snw line, use apprpriate numbers f parts 950 and 9504 t raise the terminal pint. Lcal cdes determine flue distance abve snw line. Always terminate with the terminal end f ur 905. Always terminate in the hrizntal plane. The hrizntal system will nt wrk in a cnfiguratin in which the terminal end f part 950 is in a vertical psitin. ELECTRICAL: Cautin: The 4 vlt transfrmer supplied with the MZ is nly intended t perate the heating system cmpnents. If zne valves are being used an auxiliary transfrmer f the prper VA rating must be installed separately. Please see zne valve manufacturers data sheets fr prper transfrmer sizing and wiring recmmendatins. Attaching zne valves t heating system transfrmer will cause damage and will vid warranty. Electrical cnnectins and cntrl strategies, including the summer / winter switch. The installatin must cnfrm t ne r mre f the fllwing, as applicable: A.) Lcal cdes r, in the absence f lcal cdes, the Natinal Fuel Gas Cde, ANSI Z.. B.) Canada-CGA B49 installatin cde and/r lcal installatin cdes. C.) The Natinal Electrical Cde ANSI/NFPA N. 70. D.) CSA Standard C. and Canadian Electrical Cde PZ.. ELECTRICAL CONNECTIONS FROM SITE The heating system, when installed, must be grunded in accrdance with lcal cdes r, in the absence f lcal cdes, with the Natinal Electrical Cde, ANSI/NFPA 70 and the CSA Standard Canadian Electrical Cde C.. The MZ is designed fr 0 vlt, 60 cycle, three-wire (lad, neutral, and grund) current and draws abut watts in full peratin. The electric supply shuld be frm a dedicated 5 amp circuit. The MZ is easy t wire. Trim the minimum amunt f material frm the pyramid-shaped grmmets in the MZ s cabinet s as t prvide a snug fit fr all wiring in and ut f the MZ. Run lw and high vltage wires thrugh the strain reliever n the left side f the cntrl panel, thrugh the chase and int the cntrl panel. Make sure plarity is crrect r the unit will lck ut right after lighting. There are black jumper wires ging int terminals t the left f the high vltage blck. Frm left t right they are T, T, & T. Nte: If bth jumpers are left in place, the pump will run cntinuusly and the MZ will maintain the aquastat setting cntrlled by the adjustable black knb n the MZ s cntrl panel. Jumper psitin and the summer/winter switch have n effect n a pririty zne, r a Dmestic Ht Water call cming in t the MZ thrugh the wiring harness that is part f the DHW kit. If yu desire cnstant circulatin in the heating (winter) mde (water mving thrugh the B side f the -way valve at all times if MPI s DHW Kit is used fr priritizing r if the MZ 5S is used) and the thermstat r heating system cntrl firing the burner as needed, then leave the jumper in T, T and the heating system cntrl in T, T. Cnstant circulatin has multiple benefits. We recmmend designing fr cnstant circulatin whenever practical. T 0V-60HZ T T T N 0V-60HZ T L 5 T T N L

16 INSTALLATION AND TECHNICAL T call fr burner and pump at the same time, leave the jumper in T, T and the heating system cntrl in T, T. Check that the flue utlet and air intake is leak free and unbstructed. T 0V-60HZ T T Flushing the gas will als have the effect f remving any xide particles frm the pipes prduced during brazing. T N L With the heating system s summer/winter switch in the summer (sunshine symbl) psitin, the heating system will nt respnd t a call fr heat frm a space heat thermstat r ther space-heat cntrl.! AT T E N T I O N! N attempt shuld be made t cnnect electrical wires t any ther lcatin except. The indirect ht water strage tank wiring kit, which plugs int the terminal scket n the right side f the cntrl panel cluster; and which als includes strap-n aquastat t be installed inside the MZ and wired in series with the MZ s builtin high limit flue and leaving water safety limits. (See page 8).. Tw-stage external cntrl f MZ 0-40C. NOTE: Tw-stage peratin f the Mdel MZ40C is autmatic: On a call fr heat, bth burners fire. When return water temperature gets t between 9º F t 4º F f the setting n the adjustable aquastat n the face f the heating system, the nd stage shuts ff and the st stage runs until the heat call is satisfied. If return-water temp falls, the secnd stage cmes back n. PREPARATION FOR USE/INITIAL START-UP: Check fr the appearance f the flame thrugh the rund bservatin windw inside the hinged dr just abve the cntrls. Check that the installatin is filled with water. The water pressure shuld equal PSI. The MZ heating system has tw air purge valves, ne n the heating utlet, the ther n the dmestic ht water heater (5 S mdel dual-functining unit). Check that the electricity supply is cnnected crrectly: 0 V-60 Hz, with crrect plarity. Check that the siphn trap is filled with water. Check that the cndensate utlet is cnnected. Make sure the circulatr is running. If nt, remve cap cvering shaft and manually start. The adjustable dmestic ht water thermstat is factry set n the MZ 5S. If it becmes necessary t adjust this psitin it s recmmended that fr energy efficiency the setting be kept at the minimum water temperature cnsistent with the cnsumer s needs. The maximum DHW temp is 45. Keep in mind there is a ht water scald ptential if the thermstat is set t high. COMMISSIONING: When perating the unit fr the first time, the installer must verify: That the gas valve wrks prperly; That the flame cntrl wrks prperly; The burner setting: CO, CO, and gas valve settings are crrect.. Open the manual valve n the gas inlet.. Switch n the main heating switch, r circuit breaker. Shuld verheating ccur r the gas supply fail t shut ff, turn ff the manual gas cntrl.. Set the lighted n/ff switch n the cntrl unit t the n psitin. D nt use this unit if any part has been under water. Immediately call a qualified service technician t inspect the unit and t replace any part f the cntrl system r any gas cntrl, which has been under water. 4. Put the circulating pump switch t the winter psitin (snwflake). In the summer psitin (sun), the circulating pump nly wrks when the dmestic ht water tank requires heating (MZ 5S r C mdels with indirect ht water strage tank). Befre initial start up f the unit, the installer shuld: Check that the gas circuit is leak free. Carefully flush ut the gas pipes. Where the installatin is new, the purge serves t evacuate the air that is cntained in the pipes s that the unit has sufficient fuel. The presence f air in the gas prevents the burner frm lighting and results in the flame cntrl unit safety device cutting in. This applies t a new installatin running n either natural gas r LP. Fr the latter, the strage tank must als be prperly flushed befre initial start up. FLOW VERIFICATION: In rder fr the MZ t functin prperly a minimum amunt f water must flw thrugh the MZ s heat exchanger t remve the heat being prduced. There is a flw switch inside the MZ that will nt allw the MZ t fire unless there is minimum flw. Apprximate external feet f head available frm the Grundfs UPS54 in the MZ5 series heating system at flw rates shwn. ATTENTION! All necessary safety precautins shuld be taken when venting the gas. MZ INSTALLATION & MAINTENANCE 6 GPM Speed : FT f Head Available 0 5

17 INSTALLATION AND TECHNICAL - ACCESSORIES The pump in the MZ40C is generally nt capable f pumping nrmal heating znes utside the heating system. Such applicatins nrmally will require additinal series pumping r a primary-secndary layut. The pump WILL supply adequate flw fr prper peratin f ne f ur BS indirect tanks thrugh ur DHW kit. When the MZ is prperly cnnected t a primary-secndary pumping layut, the MZ s pump will prvide the necessary flw. When the MZ is directly cnnected t a system in which the pump inside the MZ is used t pump the entire system, the system must be checked fr prper flw. If the system is a single-zne system r a multi-zne system balanced with manually set circuit setters, there either will r will nt be sufficient flw t clse the flw switch. If the system is multi-zne with zne valves used t pen and clse znes n demand, the system can be checked fr prper flw by running the system ne zne at a time with all f the ther znes ff. If any f the znes restrict flw s much that the flw switch will nt clse, adjustment t the system will have t be made, such as wiring the system s that the restricted zne can nly perate when anther zne is running r adding a pump t that zne, increasing the pipe diameter r zne valve selectin fr that zne, r installing a differential pressureverflw valve. LEAVING WATER LIMIT-SWITCH FUNCTION There is a manual reset high temperature limit switch in the water jacket f the MZ. In systems with lw flw r systems with water-glycl mixes, it is pssible fr that manual reset switch t trip befre the call fr heat has been satisfied. In rder t check fr this pssibility, the system shuld be run with the adjustable limit switch n the MZ s panel turned full clckwise. The temperature - cntrl devices in the system (thermstats, aquastats etc.) shuld be adjusted t deliver the highest temperature that this applicatin will require until thse temperature-cntrl devices are satisfied. NOTE: If the system has been designed t require high temperature (>76 F.) water at design cnditins, care must be taken t prevent nuisance trips f the MZ s manual-reset high-limit switch. The best ways t d that is t prvide fr cnstant circulatin in the winter mde, r add mre radiatin. In multi-zne applicatins, each zne shuld be run individually t assure that nuisance limit-switch trips will nt ccur during the heating seasn. If the manual reset switch trips, pull the adjustable-limit switch knb and adjust the wire stps in the knb s that the adjustable limit shuts the MZ dwn befre the ver-limit switch pens. If the leaving-water temperature at that setting will satisfy the structure s need fr heat n a design day, the prblem has been slved. If the leaving-water temperature will nt satisfy the need fr heat at that setting. Changes t the distributin system, piping arrangement, pumping prvisin, cntrl system, r the additin f radiatin may be apprpriate. D nt install MZ heating systems in jbs that require mre than 76º F. water. I I I. A C C E S S O R I E S BS INDIRECT WATER TANK A. 6 L austenitic stainless steel cil. B. 6 L austenitic stainless steel tank. C. Mlded, rigid remvable insulatin. D. Remvable ABS plastic casing. E. DHW cld inlet. F. DHW ht utlet. G. Heating system circuit inlet. H. Heating system circuit utlet. I. Pressuretemperature relief tap and/r DHW recycling circuit tap. J. Inspectin pening and ande access. K. Thermmeter. L. Aquastat. BS50 BS 80 BS 5 BS 40 Mdels Nminal Strage Gal. 45." 6" 7.5" 6.4" Height IN..6".6".6".6" Diameter IN. /4" /4" /4" /4" All Pipe Cnnectins MPT Max DHW Pressure PSI 68-76ºF 68-76ºF 68-76ºF 68-76ºF Aquastat Range F 0.8ºF 0.8ºF 0.8ºF 0.8ºF Aquastat Differential F.9".9".9".9" Inspectin Prt Opening IN MBH 5 5 Nminal Exchanger Pwer (70ºF Av. system Water Temp) 7 MIN. 0 5 MZ5 Nminal Reheat Time frm 50ºF t 40ºF Stred GPM.8 MZ5 Cntinuus Output at 0ºF GAL. 50 MZ40 Nminal First Hur Draw at 70ºF Rise LBS. 7 Dry Weight Ratings assume cld-water inlet at 50ºF, heating system circuit average temp f 70ºF and heating system utput at least equal t the nminal heat exchanger pwer shwn abve. Tank utput cannt exceed heating system utput. 7

18 ACCESSORIES DHW KIT-MPI #95 Rapid way t ffer tw temperatures Pririty t DHW Zne MZ Heating System built-in cntrl feature that allws the nn priritized spaceheat side t be regulated by the main temperature knb and the high temp side cntrlled by a strap-n aquastat. The kit cntains a factry wiring harness, -way valve, mtr, and strap n aquastat. The heating system utput s first cnnectin is the AB prt f the -way valve. All system water flw thru the B prt will be cntrlled by the MZ s main temp knb and the heating thermstats. The A prt will be the primary hi temp circuit fr DHW recvery. The A prt is als a pririty zne. Wire the aquastat in series with the high limit n the MZ s water jacket. Strap the bulb t the leaving water pipe just behind the cmbustin- air fan. Cver with fam insulatin. Secure with nyln ties; nt ultra tight. Adjust leaving water temp. at 70º t 75º F. Scratching the paint ff the water pipe will give a mre accurate temp reading. Frm Factry Harness T -way valve mtr Either black t Black Either black t # n BS tank Brwn t # n BS tank Orange t Heating System Grund Mnitr s dmestic ht water kit (part # 95) allws fr the zning and cntrl f any indirect tank, r any tw r mre temperature applicatins - ne usually being DHW recvery - with the higher temp being a pririty. This system utilizes the T Indirect tank r High temp thermstat Brwn Grey t Blue Green Grund terminal n tank (cnnect t grund) Red - nt used Red - nt used MPI #90 MZ MOD CONTROL / MPI #90 The MZ Md Cntrl cmes with mdulating cntrl, strap n sensrs, instructin manual, utdr sensr, & wiring harness. MZ MOD CONTROL SPECIFICATIONS Cntrl Micrprcessr PID Cntrl. This is nt a safety (limit) cntrl Enclsure Enclsure D, back Nryl Plastic Optinal Devices Universal Sensr Dimensins 4-/4" H x -7/8" W x -7/8 D (0 x 74 x 48 mm) Apprvals CSA C US, meets ICES & FCC regulatins fr EI/RFI Pwer Supply 4 V 50/60 Hz 75 VA Pump / Stage Relay 0 V (ac) 5 A /6 hp, pilt duty 40 VA Stage Relay 0 V (ac) A /6 hp Alarm Relay 4 V (ac) A /6 hp Ambient Cnditins Indr use nly, -40 t 40º F (40 t 60º C) <90% RH nn-cndensing Sensrs Include NTC thermistr, 0 77º F (5º C 0.º C) B = 89 f Universal Sensr and f Outdr Sensr Cntrl Features: Versatile, easily adapts t all cmmn piping methds. Heating system inlet and utlet sensrs Optinal primary lp sensr Optinal DHW sensr. Smart cntrl feature can adapt t the building. Exercising f heating system pump. Purging f heating system based n time. MZ INSTALLATION & MAINTENANCE Display f temperatures & run times Errr messages fr sensr failure with alarm signal. Minimum n and ff delays Adjustable differential. Smart cntrl feature adapts t each heating system. Built-in test sequence. Building ccupants can be lcked ut f installer s settings. 8