O.K. Safety first CDN USA. Table of Contents. Approvals. Attention IFGC CSA UL ANSI NFPA
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1 FRS 7../6 & FRS 5... Gas Pressure Regulator Installation Instructions USA CDN Table of Contents Table of Contents... Page 1 Approvals... Page 1 Attention... Page 1 Specification... Page 2 Lock-up Pressure Parameters.... Page 3 Mounting Preparation.... Page 3 Mounting & Installation... Page 4 Pressure Tap Connections.... Page 5 Regulator Orifice Diameters... Page 5 Outlet Pressure Spring Selection... Page 6 Breather Plug... Page 6 Vent Limiting Device, Backloading & Venting Page 7 External Impulse... Page 7 Outlet Pressure Adjustment... Page 8 Spring Replacement... Page 8 Flow Curve... Page 9 Accessories & Replacement... Page 10 Approvals FRS 7../6 series are CSA Certified: ANSI Z21.18/CSA 6.3. FRS 5... series are CSA Certified: ANSI Z21.18/CSA 6.3. Commonwealth of Massachusetts Approved Product Approval code G Repair Kits... Page 10 Attention 1 11 Explanation of symbols 1, 2, 3... = Action = Instruction The installation and maintenance of this product must be done under the supervision of an experienced and trained specialist. Never perform work if gas pressure or power is applied, or in the presence of an open flame. Please read the instruction before installing or operating. Keep the instruction in a safe place. You find the instruction also at www. dungs.com If these instructions are not heeded, the result may be personal injury or damage to property. Any adjustment and applicationspecific adjustment values must be made in accordance with the equipment manufacturers instructions. Safety first O.K. IFGC CSA UL ANSI NFPA Never close Breather hole! On completion of work on the pressure regulator, perform a leakage and function test. This product is intended for installations covered by, but not limited to, the following codes and standards: NFPA 37, NFPA 86, NFPA 54, CSD-1, UL 795, ANSI Z83.4, ANSI Z83.18, ANSI Z21.13, CSA B149.1, CSA B149.3 and CSA B Breather plug Breather hole
2 Specification FRS The FRS series balance type, pressure regulator is a spring-loaded pressure regulator with adjustable setpoint spring and an internal impulse for regulating output pressure. [PSI] Max. Operating Pressure (MOP) 7 PSI (500 mbar) for FRS 7../6 series. 10 PSI (680 mbar) for special versions of FRS 7../6 series (see P/N s below). 7 PSI (500 mbar) for FRS 5... Flanged series. 5 PSI (350 mbar) applies to the CSA Certification for FRS 7../6 and for FRS 5... Flanged series. Output pressure range Adjustable with different springs 1 to 80 in. W.C. F Ambient / Fluid Temperature FRS 7../6 NPT Threaded Series: +5 F to +160 F for up to 7 or 10 PSI, depending on model, for regulating behavior (+/- 10 % of setpoint) CSA Certified for -40 F to +160 F: Diaphragms are suitable for the low temperature, but there may be out of range regulating behavior. FRS 5... Raised Face Flange Series: +5 F to +160 F (-15 C to +70 C) for up to 7 PSI. Maximum pressure drop and gas velocity The maximum pressure drop is litmited by the celocity of the gas. Do not exceed a gas velocity of 30 meters/s. Gas Gases Dry, natural gas, propane, butane; other noncorrosive gases. Suitable for up to 0.1% by volume, dry H 2 S. A dry gas has a dew point lower than +15 F and its relative humidity is less than 60 %. Materials in contact with Gas Housing: Aluminum & Steel Seals & Diaphragm: NBR-based rubber. Vent Limiting Device and Vent Line Connection The FRS/6 has an internal, factory installed vent limiter, which limits the escape of gas to less than PSI in case atmospheric diaphragm ruptures. Vent limiting device also complies with EN 88-1 & ISO Venting required unless otherwise accepted by the authority having jurisdiction. Droop and Hysteresis Hysteresis is less than 10 % for up to 7 PSI inlet. Average droop at 20:1 turndown is 10 % for up to 7 PSI. Lock-up Rating The FRS meets the ANSI Z.21.80/ CSA 6.22 as Class I, which allows lockup rating not more than 150 % or 5 in. W.C, whichever is greater. The FRS meets EN 88-1 as SG30, which allows lock-up as high as +30 % of the outlet pressure. See Lock-up Pressure Parameters on page 3 for more details. Body Size Size Order No. 7 PSI max. Order No. 10 PSI max. FRS 705/6 1/2 NPT FRS 707/6 3/4 NPT FRS 710/6 1 NPT FRS 712/6 1 1/4 NPT FRS 715/6 1 1/2 NPT FRS 720/6 2 NPT FRS 725/6 2 1/2 NPT FRS 730/6 3 NPT FRS 5040 (internal impulse) 1 1/2 DN (ISO) Flanged not available FRS 5050 (internal impulse) 2 DN (ISO) Flanged not available FRS 5065 (internal impulse) 2 1/2 DN (ISO) Flanged not available FRS 5080 (internal impulse) 3 DN (ISO) Flanged not available FRS 5100 (internal impulse) 4 DN (ISO) Flanged not available FRS 5125 (internal impulse) 5 DN (ISO) Flanged not available FRS 5150 (internal impulse) 6 DN (ISO) Flanged not available 2 11
3 Lock-up Pressure Parameters Per ANSI Z21.80, lock-up is defined as an outlet pressure not more than 150 % or 5 in. W.C, whichever is greater, above the setpoint after a downstream safety shutoff valve closes with 2 seconds, and the two following conditions exists: 1. outlet pressure is set to the highest set point of the spring, and 2. the regulator is set to maximum capacity or flow at which the regulator will control lockup pressure within the acceptable limits. This means that in a given application, a lock-up greater than 150 % or 5 in. W.C could occur, depending out the inlet pressure, the outlet pressure of the regulator, the flow rate of the regulator, closing time of safety shutoff valves, and the pipe volume downstream the regulator and upstream the safety shutoff valve. Per DUNGS & EN 88, lock-up is +30 % of the outlet pressure setting after downstream shutoff valve slowly closes within 30 seconds. Therefore, in a given application, a lockup greater than +30 % or 5 in. W.C could occur, depending out the inlet pressure, the outlet pressure of the regulator, the flow rate of the regulator, closing time of safety shutoff valves, and the pipe volume downstream the regulator and upstream the safety shutoff valve. Lock-up Pressure Spike If in a given application the lock-up pressure is too high, upon system shutdown, employing one or more of the following should reduce the lock-up pressure: 1. Increase the size of the regulator. 2. For standard applications, increase the pipe volume downstream the regulator and upstream the safety shutoff valve. For a commercial appliance using a combination valve with a zero governor, installing the FRS within 1-2 feet of the appliance will help minimize the lock-up pressure. 3. Decrease the inlet pressure. 4. Decrease the oulet pressure. 5. Reduce the flow rate. 6. Disconnect vent line, if installed. 7. Use the external impulse option (see page 7). This will typically reduce the lock-up pressure by 10 %. 8. Install a token relief valve. Lock-up Pressure Creep If the lock-up pressure slowly increases over time, the regulating disc is dirty or damaged or the regulator is defective. In most cases to correct this condition, the regulator must be replaced. Mounting Preparation Mounting Preparation FRS 7../6 & FRS 5... Flanged The main gas supply must be shut off before starting the installation. Carefully examine the unit for shipping damage. Remove all dirt and debris before installing. Failure to remove dirt/debris could result in damage or improper performance. Recommended Mounting Procedure Regulator dome from vertically upright to horizontal 3 11 If the flow is not in the same direction of the arrows, the regulator will not operate properly.
4 Mounting & Installation Procedure to Mount the FRS 7../6 Install the FRS.../6 with the gas flow matching the direction indicated by the arrows on the casting. Mount the FRS.../6 with the regulator dome vertical or horizontal. Use new, properly reamed and NPT threaded pipe free of chips. Apply good quality pipe sealant, putting a moderate amount on the male threads only. If using LP gas, use pipe sealant rated for use with LP gas. Do not thread pipe too far. FRS.../6 distortion and/or malfunction may result from excess pipe in the valve body. Apply counterpressure with a parallel jaw wrench only to the flats of the FRS.../6 when installing pipe. Do not overtighten the pipe. Follow the maximum torque values listed. After installation is complete, perform a leak test using a soapy water solution. Quickly opening the inlet manual shutoff valve can permanently rupture the internal, balancing diaphragm. Install the FRS 5... with the gas flow matching the direction indicated by the arrows on the casting. Mount the FRS 5... with the regulator dome vertical or horizontal. Insert seal inbetween flanges. Insert bolts, tighten in a star pattern to ensure uniform tightness. Do not overtighten bolts. Follow the maximum torque values listed. After installation is complete, perform a leak test using a soapy water solution. FRS 7../6 Threaded Series FRS 5... Flanged Series NPT pipe T max [Ib-in] 1/2 3/4 1 11/4 11/2 2 21/ Do not overtorque threaded connection or bolts. Permanent damage will occur. Bolts: as per DIN 939 T max [Ib-in] 443 NOTE: There are no limits for required pipe lengths immediately downstream of the FRS. If the flow is not in the same direction as the arrows, the FRS will not operate properly. 4 11
5 Pressure Tap Connections Pressure Taps - FRS 7../6 Threaded Version 1 Vent/breather connection FRS 705/6 - FRS 710/6, G 1/4 in. FRS 712/6 - FRS 730/6, G 1/2 in. 2 External impulse connection FRS 705/6 - FRS 710/6, G 1/4 in. - one side. FRS 712/6 - FRS 730/6, G 1/4 in. - both sides. 3 Upstream pressure connection FRS 705/6 - FRS 710/6, 1/4 in. NPT - one side. FRS 705/6 - FRS 710/6, G 1/4 in. - one side. FRS 712/6 - FRS 730/6, 1/4 in. NPT - both sides. Field mountable adapter for vent connection G 1/4 to 1/4 NPT Order No G 1/2 to 1/2 NPT Order No Downstream pressure connection FRS 705/6 - FRS 710/6, 1/4 in. NPT - one side. FRS 712/6 - FRS 730/6 1/4 in. NPT - both sides. Pressure Taps - FRS 5... Flanged Version FRS Flanged 1 Vent/breather connection FRS FRS 5150, G 1/2 in. 2 External impulse connection FRS FRS 5150, both sides G 1/4 in. See caution below. 3 Upstream pressure connection FRS FRS 5150, both sides G 1/4 in. 4 Downstream pressure connection FRS , both sides G 1/4 in. Field mountable adapter for vent connection G 1/4 to 1/4 NPT Order No G 1/2 to 1/2 NPT Order No When using external impulse connection, the internal impulse tube must be sealed with RTV. Regulator Orifice Diameters Regulator Type FRS 705/ FRS 707/ FRS 710/ FRS 712/ FRS 715/ FRS 720/ FRS 725/ Orifice Diameter (mm)
6 Outlet Pressure Spring Selection Outlet Pressure Spring Selection (outlet pressure values are for horizontal pipe mounting) The output pressure is controlled by the force of the adjustable spring. The pressure regulator is supplied with the blue spring No. 4. By exchanging springs, other output pressures can be attained. Subtract 1 W.C. when mounted vertically. Spring # Spring Range (W.C.) Spring color Spring 1 1 to 3.6 brown Not CSA Spring 2 2 to 5 white Spring to 8 orange Spring 4 4 to a12 blue Standard Spring 5 10 to 22 red Spring 6 12 to 28 yellow Spring 7 24 to 40 black Spring 8 40 to 60 pink Spring 9 60 to 80 grey Not CSA FRS 705/ FRS 707/ FRS 710/ FRS 712/6, 715/6, FRS 720/6 & FRS 725/6, 730/6, 5065, FRS FRS FRS Breather Plug All FRS s have a breather plug that threads into the regulators s vent connection. Do not removed plastic breather plug unless venting outdoors is required. This plug is not the vent limiter, and it prevents debris from entering the upper chamber of the regulator. Debris in the upper chamber of the regulator could adversly affect regulator performance. The FRS regulator must also be able to exchange air through the breather hole in order to properly regulate. Do not plug the breather hole. Clear out if necessary. Breather plug Breather hole 6 11
7 External Impulse When it is desirable to use the external impluse as the feedback for the regulator, the internal impluse must be plugged. Seal the interal impulse connection with a silicone or RTV sealant suitable for exposure to natural gas, propane, or butane. The external impulse must be properly terminated and made of a durable, metal material that is suitable for gas service. External Impulse Connection Internal Impulse Silicone or RTV sealant The external impulse must terminate back into the gas piping at a point that is upstream two safety shutoff valves in series. Vent Limiting Device, Backloading & Venting Vent Limiting Device The FRS/6 series regulator contains an internal, factory installed vent limiting device, which limits the escape of gas to less than PSI in case atmospheric diaphragm ruptures. Venting required unless accepted by the authority having jurisdiction. The vent connecton is G 1/4 for FRS 705/6 to FRS 710/6 and G 1/2 for FRS 712/6 to FRS 730/6 and for all ISO flanged regulators. G 1/4 to 1/4 NPT adapters are available: (Order No ) and G 1/2 to 1/2 NPT (Order No ). Backloading Requirements If the vent line connection is backloaded with an air pressure, the air pressure may be 7 PSI/500 mbar maximum without damaging the FRS or causing adverse outlet pressure conditions Vent Line Requirements It is highly recommended that the internal vent limiter of the FRS be relied upon rather than venting the FRS, especially if the vent line is greater than 15 ft. An atmospheric vent line (aka vent line ) from a regulator can adversely affecting the performance (lockup, response time, repeatability, hysteresis, etc) of the regulator, which can result in damage to the downstream appliance (e.g. combustion chamber), excessive CO, hard light-offs, or nuisance shutdowns. If venting is required regardless of these issues, then the vent line from a regulator should be installed in accordance with the local code for vent sizing and termination requirements. In the absence of local codes, follow National Fuel Gas Code NFPA 54, the International Fuel Gas Code or the CSA B149.1 installation code for venting requirements in combination with the requirements in section Vent Line Installation. Connecting the vent line to the FRS If venting the regulator, the vent line is to be connected to the upper dome of the FRS regulator as illustrated. Remove the beather plug. In the absence of venting codes and where venting is required, each regulator must be vented separately from all other vents.
8 Vent Line Installation Requirements for Vent Line Installation 1. Do not use excessive fittings or long pipe runs. With runs longer than 15 ft, increasing the pipe size can increase stack effect (movement of air through the vent line) and can reduce air friction to improve breathability of the regulator. 2. Elbows significantly reduce stack effect. Keep elbows to an absolute minimum, and when a 90 deg needs to be made, do as follows: If using rigid pipe, use long radius elbows (not short). Long radius elbows have a bending radius of 1.5 times the pipe diameter. Short elbows have a bending radius of 1 times the pipe diameter. If using tubing and permitted by code, use a minimum bending radius of 2 x the vent line outside diameter. 3. Do not reduce along the entire run of the vent line the pipe size that is established at the regulator s threaded vent connection. 4. Do not apply a bending moment on the vent line, if rigid pipe is used. This can apply a large bending force (a severe stress) to the vent connection of the regulator and damage the housing, which will bypass of the vent line. 5. Apply proper pipe hangers and supports so that the vent line does not load or strain due to the regulator vent line connection. 6. Do not combine or connect other vents from other devices. Requirements for Vent Line Length and Size for a maximum 15ft run For ¼ vent line connection Use schedule 40, ¼ pipe or minimum 9mm OD tubing. For regulator main inlet pipe connections up to 1 and with ½ vent line connection Use schedule 40, 3/8 pipe or minimum 12mm OD tubing For regulator main inlet pipe connections greater than 1 and with ½ vent line connection Use schedule 40, ½ pipe or minimum 15mm OD tubing Additional Requirements for Vent Line Length and Pipe Size for runs beyond 15ft For regulator main inlet pipe connections up to 1 and with ¼ vent line connection The same as above applies, and then after a length of 15 ft: schedule 40, 3/8 pipe or minimum 12m OD tubing. After additional 10ft, increase pipe to schedule 40, ½ pipe or minimum 15mm OD tubing. For regulator main inlet pipe connections up to 1 and with ½ vent line connection The same as above applies, and then after a length of 15 ft: ½ pipe or minimum 15mm OD tubing After additional 10ft, increase pipe to schedule 40, 3/4 pipe or minimum 20mm OD tubing. For regulator main inlet pipe connections greater than 1 and with ½ vent line connection The same as above applies, and then after a length of 15 ft: schedule 40, 3/4 pipe or minimum 20mm OD tubing. After additional 10ft, increase pipe to schedule 40, 1 pipe or minimum 26mm OD tubing Requirements for the Vent Line s Point of Termination 1. If a vent line runs through a roof, verify that the vent line terminates above the point where water due to heavy rains and snow accumulate on the roof do not cover or isolate the termination point from the atmosphere. 2. To limit the consequences of rain or debris getting into the vent, always turn the outlet of the vent down towards the ground (goose necked). 3. Bugs Screen Bugs are attracted to the smell of the natural/lp gas odorant and will nest in the vent line, which will further reduce stack effect or will completely seal the termination point. Install a bug screen on the termination point to deter insects from nesting in the line. Do not paint the bug screen. 4. Points of Discharge The vent line must discharge away from where people might walk or work, such as pedestrians, roofers and other maintenance professionals. The vent line must discharge away from fresh air intakes and from windows. See applicable fuel gas installation codes (e.g. CSA B149.1, NFPA 54, or the International Fuel Gas Code) for acceptable clearances. 8 11
9 Outlet Pressure Adjustment Adjusting the FRS outlet pressure 1. Verify that the intended output pressure is within the spring range that is installed in the regulator by comparing the colored outlet pressure label with the table on page Remove the black cover. 3. To increase outlet pressure, turn the adjustment spindle clockwise. To decrease the outlet pressure, turn the adjustment spindle counterclockwise. 4. Always use an accurate pressure gauge connected downstream of the regulator to measure the actual outlet pressure as the FRS is mounted in the operating position. 5. Reinstall the black adjustment cover. 6. To prevent unauthorized adjustment, holes in the black cover and the side of the regulator can be used to secure a lead seal. Cover - + Outlet pressure adjustment CCW reduces outlet pressure CW increases outlet pressure Top View Spring Replacement Remove the adjustment cover. Completely release the spring tension by turning the adjustment spindle completely counterclockwise with a screwdriver, and remove the aluminum cap. Remove existing spring and insert new spring. Re-install the adjusment cover, and apply the new outlet pressure label provided with new outlet pressure range onto the name plate. Reinstall the adjustment cover. Never have your head above or near the aluminum cap when removing regulator spring. The spring tension can be high enough to rapidly eject the aluminum cap with a large force. Adjustment cover Adjustment spindle for outletpressure adjustment Aluminum Cap. Turn only to remove outlet pressure spring Spring Breather plug
10 Flow Curve Flow Curve (mechanically open) Using Natural Gas. NPT 1/2 NPT 3/4 NPT 1 NPT 1 1/4 NPT 1 1/2 DN 50 (2 ) NPT 2 NPT 2 1/2 DN 65 NPT 3 DN 80 DN 100 (4 ) DN 125 (5 ) DN 150 (6 ) Pressure Drop (in. W.C.) ,000 20,000 40,000 60, , , ,000 Flow of Natural Gas (cubic feet/hr) Sizing an FRS for an application 1) Based on desired maximum flow rate, intersect the FRS flow curve and determine corresponding pressure drop. 2) Select a spring in the table on page 6 that fits within the desired outlet pressure for the application. 3) Add the desired outlet pressure to the pressure drop determined in step one above. The sum of these is the required minimum inlet pressure to achieve the desired maximum flow rate. Example of sizing an FRS for an application 1) Desired maximum flow rate = 2,000 CHF and desired outlet pressure = 12 WC 2) From table on page 6, either the blue, red or yellow spring will work, because 12 of W.C. is within the range of these springs. 3) 2000 CFH intersects the following curves and corresponding flow rates FRS 707 = 16 of W.C. drop FRS 710 = 6.5 of W.C. drop FRS 712 = 2.7 of W.C. drop FRS 715 = 1.8 of W.C. drop Adding 12 to these values gives the following minimum inlet pressures required to achieve the flow rate up to 2000 CFH with 12 of W.C. outlet pressure. FRS 707 requires minimum inlet pressure of 28 ( ) of W.C. FRS 710 requires minimum inlet pressure of 18.5 ( ) of W.C. FRS 712 requires minimum inlet pressure of 14.7 ( ) of W.C. FRS 715 requires minimum inlet pressure of 13.8 ( ) of W.C
11 Maintenance & Testing The regulator shall be annually tested for proper performance and leakage as follows: Verify there is no external leakage out the vent, at the inlet and outlet connections, and where there are o-ring seals. Apply a leak detection solution to these areas. The presence of bubbles indicates an leak. If the leakage can not be sealed, the regulator must be replaced. Verify the regulated pressure is in accordance with the requirements of the downstream appliance/burner. If the outlet pressure is either too high or too low, adjust the regulator to get a proper regulated pressure. If the proper Accessories & Replacement regulater pressure can not be achieved, replace the regulator. If vented, remove the adjustment spindle and inspect the inside of the upper dome for debris. Signs of water or other materials indicate improper venting that needs to be corrected. Verify that the lock-up pressure does not exceed the requirements for the downstream appliance/burner. If the lock-up pressure is too high, employ one of the methods describe in section Lock-up Pressure Parameters or replace the regulator FRS Flange Accessories Body Size Repair Kits Repair Kit Order No. (contains all internal hardware to rebuild regulator) FRS 705/6 FRS 707/6 FRS 710/6 Flange Description Not available Not available Not available FRS 712/6, 715/6 & FRS 720/6 & Karl Dungs, Inc Pheasant Ridge Drive NE Suite 150 Blaine, MN 55449, U.S.A. Phone Fax info@karldungsusa.com Internet # of Holes per Flange Flange Order No. Repair Kit Karl Dungs GmbH & Co. KG P.O. Box D Schorndorf, Germany Phone +49 (0) Fax +49 (0) info@dungs.com Internet Bolt size Order No. (contains all internal hardware to rebuild regulator) FRS 725/6 & FRS 5080 & 730/ FRS FRS FRS We reserve the right to make modifications in the course of technical development. **Bolt Order No. ***Gasket Order No. FRS /2 ISO Flanged M16x FRS ISO Flanged M16x FRS /2 ISO Flanged M16x FRS /2 ISO to NPT M16x FRS ISO Flanged M16x FRS ISO to NPT M16x FRS ISO Flanged M16x FRS ISO Flanged M16x FRS ISO Flanged M20x * When a control is used alone, one mating flange is needed for each end, for a total of two flanges. When one control is bolted to another, such as an FRS to a DMV dual modular safety valve, one mating flange is needed for each end, for a total of two flanges. ** Includes one bolt, one lock washer, and one nut. *** One seal needed for each flange.
Commonwealth of Massachusetts Approved Product Approval code G
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