Capacity regulator (hot gas bypass), type TUH/TCHE/ REFRIGERATION AND AIR CONDITIONING Technical leaflet
Contents Page Introduction........................................................................................3 Features............................................................................................3 Standard range.....................................................................................3 Identification.......................................................................................4 Technical data......................................................................................4 Ordering...........................................................................................5 Sizing..............................................................................................6 Replacement capacity and mass flow R134a..........................................................................................7 R22.............................................................................................9 R44A/R57.................................................................................. 11 R47C........................................................................................ 13 R41A........................................................................................ 15 Design/Function.................................................................................. 17 Dimensions and weight.......................................................................... 18 Application....................................................................................... 2 2 RD4EG22 DKRCC.PD.HK.A2.2 / 52H49 Danfoss A/S (RC-CMS / HBS), 1-25
Introduction TUH/TCHE/ capacity regulators adapt compressor capacity to actual evaporator load in applications operating at an evaporating temperature of around C. TUH/TCHE/ valves are typically used in applications such as: Air driers Water chillers Fitted in a bypass between the high and lowpressure sides of the air-drier system, TUH/TCHE/ maintain compressor suction pressure by injecting hot gas/cool gas from the high-pressure side. TUH has internal pressure equalisation and opens when pressure drops at the valve outlet. TCHE/ have external pressure equalisation and open directly when compressor suction pressure drops. For all types, the bulb only serves as a reservoir for the charge. However, it is recommended that the bulb be mounted in a location where temperature variation during operation is limited (see application drawings). Features Bimetal connections straightforward and fast soldering (no wet cloth or refrigeration pliers required) Refrigerants R41A, R134a, R44A/R57, R47C, R22 and other refrigerants on request. Replacement capacities up to 7.3 kw (2.1 TR) for R41A Stable regulation Tight across the seat Compact design small dimensions and low weight Hermetically tight design Stainless steel, hermetically tight solder version high connection strength high corrosion resistance capillary tube joints of high strength and vibration resistance Laser-welded, stainless steel diaphragm element optimum function long diaphragm life high pressure resistance Adjustable setting accurate setting fine tuning possible Low p-band Low hysteresis have an advanced filter/strainer design Standard range (Variants available on request) Standard models: One standard range per refrigerant Refrigerants R134a, R44A/R57, R47C, R22, R41A Capillary tube length TUH.8 m / 2.6 ft. TCHE.9 m / 2.9 ft. 1 1.5 m / 5. ft. 2 1.5 m / 5. ft. 4 3. m / 1 ft. 8 3. m / 1 ft. Orifice sizes TUH Orifice 9 TCHE Orifice 3 Orifice 4 1 Orifice 1 2 Orifice 2 4 Orifice 4 8 Orifice 7 Connections Inlet: 1 mm / 3 / 8 in. Outlet: 12 mm / 1 / 2 in. 1 & 2 Inlet: 16 mm / 5 / 8 in. Outlet: 16 mm / 5 / 8 in. 4 Inlet: Outlet: 8 Inlet: Outlet: 22 mm / 7 / 8 in. 22 mm / 7 / 8 in. 28 mm / 1 1 / 8 in. 28 mm / 1 1 / 8 in. Danfoss A/S (RC-CMS / HBS), 1-25 RD4EG22 DKRCC.PD.HK.A2.2 / 52H49 3
Identification - Main valve data is given on the element (fig. 1) and on the valve body (fig. 2). Main valve data example, fig. 1 TUH = Type 68U2954 = Code number R44A = Refrigerant 5 +5 C = Adjusting range in C +23 +41 F = Adjusting range in F PS 34 bar/ MWP 5 psig = Max. working pressure 14B = Date marking (week 1, year 24, weekday B = Tuesday) Fig. 1 Main valve data example, fig. 2 = Normal flow direction inch = Connection in inches (MM = millimetres) ORIF 9 = Orifice number 9 1.3 TR = Replacement capacity in Tons of Refrigeration 4.5 kw = Replacement capacity in kw Fig. 2 Identification - Main valve data example, fig. 3 2 = Type 6.4 TR = Rated replacement capacity Q nom in Tons of Refrigeration 22.6 kw = Rated replacement capacity Q nom in kw R41A = Refrigerant 9 +7 C = Adjusting range in C +16 +45 F = Adjusting range in F 67L164 = Code number PS 42 bar/ MWP 6 psig = Max. working pressure Fig. 3 PS Technical data Max. valve body temperature: 12 C / 248 F Transient peak: 15 C / 32 F Max. permissible working pressure R134a, R22, R47C, R44A: PS = 34 bar / MWP = 5 psig R41A PS = 42.5 bar / MWP = 615 psig Max. test pressure R134a, R22, R47C, R44A: p = 37.5 bar / 54 psig R41A: p = 47 bar / 68 psig P-band max..5 bar / 7.3 psig Setting The valve is set to start opening at an evaporating temperature of +2 C/+36 F. The setting can be changed by turning the setting spindle. The temperature at which the valve starts opening is increased by turning the spindle anti-clockwise and decreased by turning the spindle clockwise. Specifically designed for hot gas applications. All valves react only on to suction pressure variations. 4 RD4EG22 DKRCC.PD.HK.A2.2 / 52H49 Danfoss A/S (RC-CMS / HBS), 1-25
Technical data (continued) Adjustment range for start opening Valve type TUH TCHE 1 Refrigerant Adjustment range for start opening [ C] [ F] R134a 7 +11 C +19 +51 F R22 / R47C 4 +8 C +25 +46 F R44A 3 +7 C +27 +44 F R41A 2 +6 C +29 +43 F R134a 6 +9 C +22 +48 F R22 / R47C 3 +6 C +27 +43 F R44A 3 +6 C +27 +43 F R41A 5 +8 C +23 +46 F R134a 6 +9 C +22 +48 F R22 / R47C 6 +9 C +22 +48 F R44A 5 +8 C +23 +46 F R41A 4 +7 C +25 +44 F Valve type 2 4 8 Adjustment range Refrigerant for start opening [ C] [ F] R134a 7 +1 C +19 +5 F R22 / R47C 6 +9 C +22 +48 F R44A 5 +8 C +23 +46 F R41A 6 +9 C +22 +48 F R134a 5 +8 C +23 +46 F R22 / R47C 5 +8 C +23 +46 F R44A 4 +7 C +25 +44 F R41A 3 +6 C +27 +43 F R134a 4 +7 C +25 +44 F R22 / R47C 5 +8 C +23 +46 F R44A 4 +7 C +25 +44 F R41A 3 +6 C +27 +43 F Ordering Supplied with bulb strap TUH TCHE Standard range Refrigerant R134a R44A/R57 R47C R22 R41A Type Orifice no. 1) The nominal replacement capacity is the regulator capacity at evaporating temperature t e = 2 C / 28 F, condensing temperature / 14 F, reduction of suction temperature / suction pressure t s = 4 K / 7 F. 2) Valves with inch connections have 1 /4 in. pressure-equalisation. 3) Valves with mm connections have 6 mm pressure-equalisation. R134a, R22, R44A/R57, R47C, R41A Nominal replacement Connection capacity 1 ) Pressure Inlet Outlet equalisation kw TR in. 2 ) Code no. mm 3 ) Code no. 1.8.5 int. 3 / 8 1 / 2 68U2953 1 12 68U295 2.6.8 ext. 3 / 8 1 / 2 68U454 1 12 68U453 3.4 1 ext. 3 / 8 1 / 2 68U4537 1 12 68U4534 1 1 2.9.8 ext. 5 / 8 5 / 8 67L15 16 16 --- 2 2 6.5 1.9 ext. 5 / 8 5 / 8 67L16 16 16 --- 4 4 11.3 3.2 ext. 7 / 8 7 / 8 67L35 22 22 --- 8 7 2.8 5.9 ext. 1 1 / 8 1 1 / 8 67L36 28 28 --- 4.5 1.3 int. 3 / 8 1 / 2 68U2954 1 12 68U2951 5.9 1.7 ext. 3 / 8 1 / 2 68U4541 1 12 68U4531 7.6 2.2 ext. 3 / 8 1 / 2 68U4538 1 12 68U4535 1 1 5.1 1.5 ext. 5 / 8 5 / 8 67L151 16 16 --- 2 2 11.3 3.2 ext. 5 / 8 5 / 8 67L161 16 16 --- 4 4 2. 5.7 ext. 7 / 8 7 / 8 67L351 22 22 --- 8 7 41.3 11.8 ext. 1 1 / 8 1 1 / 8 67L361 28 28 --- 2.8.8 int. 3 / 8 1 / 2 68U2955 1 12 68U2952 4.1 1.2 ext. 3 / 8 1 / 2 68U4542 1 12 68U4532 5.3 1.5 ext. 3 / 8 1 / 2 68U4539 1 12 68U4536 1 1 4.1 1.2 ext. 5 / 8 5 / 8 67L152 16 16 --- 2 2 9.1 2.6 ext. 5 / 8 5 / 8 67L162 16 16 --- 4 4 16.6 4.7 ext. 7 / 8 7 / 8 67L352 22 22 --- 8 7 28.8 8.2 ext. 1 1 / 8 1 1 / 8 67L362 28 28 --- 3..9 int. 3 / 8 1 / 2 68U2959 1 12 68U2957 4.1 1.2 ext. 3 / 8 1 / 2 68U4546 1 12 68U4544 5.3 1.5 ext. 3 / 8 1 / 2 68U4547 1 12 68U4545 1 1 5.4 1.6 ext. 5 / 8 5 / 8 67L153 16 16 --- 2 2 11.9 3.4 ext. 5 / 8 5 / 8 67L163 16 16 --- 4 4 2.8 5.9 ext. 7 / 8 7 / 8 67L353 22 22 --- 8 7 37.5 1.7 ext. 1 1 / 8 1 1 / 8 67L363 28 28 --- 7.3 2.1 int. 3 / 8 1 / 2 68U296 1 12 68U2958 1. 2.9 ext. 3 / 8 1 / 2 68U4548 1 12 68U4528 12.9 3.7 ext. 3 / 8 1 / 2 68U4549 1 12 68U4529 1 1 1.3 3. ext. 5 / 8 5 / 8 67L154 16 16 --- 2 2 22.6 6.4 ext. 5 / 8 5 / 8 67L164 16 16 --- 4 4 34.9 1. ext. 7 / 8 7 / 8 67L354 22 22 --- 8 7 7.3 2.1 ext. 1 1 / 8 1 1 / 8 67L364 28 28 --- Danfoss A/S (RC-CMS / HBS), 1-25 RD4EG22 DKRCC.PD.HK.A2.2 / 52H49 5
Sizing R134a 6 5 4 3 2 1-6 -5-4 -3-2 -1 1 2 3 Correction for condensing temperature The corrected replacement capacity can be obtained by dividing the replacement capacity with the correction factor given below. R134a +3 C +4 C +5 C.8 1. 1.2 Example Refrigerant R134 Compressor capacity 6 kw at +2/+5 C Min. load 5% 3 kw Replacement capacity 6 3 = 3 kw Min. evaporating temperature t e = 1. C t c = +5 C Correction factor (table) 1.2 The corrected replacement capacity thus becomes 3 kw divided by 1.2 = 2.5 kw. The gives 2.7 kw at 1./+4 C ( ) and gives 2.5 kw at.8/+4 C ( ) Thus the would be a suitable choice. 6 RD4EG22 DKRCC.PD.HK.A2.2 / 52H49 Danfoss A/S (RC-CMS / HBS), 1-25
Replacement capacity 6 5 R134a 4 3 2 1-6 -5-4 -3-2 -1 1 2 3 35 3 25 2 15 1 5 1 2 4 8 R134a +3 C +4 C +5 C.8 1. 1.2 The correction factor can either be multiplied with the valve capacity or the replacement capacity can be divided with the correction factor. Danfoss A/S (RC-CMS / HBS), 1-25 RD4EG22 DKRCC.PD.HK.A2.2 / 52H49 7
Mass flow.3.25 R134a Start opening: t e = + 2 C Mass flow [kg/s].2.15.1.5. -6-5 -4-3 -2-1 1 2 3 Mass flow [kg/s].18.16.14.12.1.8.6.4.2. Start opening: t e = + 2 C 1 2 4 8 R134a +3 C +4 C +5 C.8 1. 1.2 The correction factor can either be multiplied with the valve capacity or the replacement capacity can be divided with the correction factor. 8 RD4EG22 DKRCC.PD.HK.A2.2 / 52H49 Danfoss A/S (RC-CMS / HBS), 1-25
Replacement capacity 8 7 R22 6 5 4 3 2 1 7 6 5 4 3 2 1 1 2 4 8 R22 +3 C +4 C +5 C.8 1. 1.2 The correction factor can either be multiplied with the valve capacity or the replacement capacity can be divided with the correction factor. Danfoss A/S (RC-CMS / HBS), 1-25 RD4EG22 DKRCC.PD.HK.A2.2 / 52H49 9
Mass flow.4.3 R22 Start opening: t e = + 2 C Mass flow [kg/s].2.1..3.25 Start opening: t e = + 2 C Mass flow [kg/s].2.15.1.5. 1 2 4 8 R22 +3 C +4 C +5 C.8 1. 1.2 The correction factor can either be multiplied with the valve capacity or the replacement capacity can be divided with the correction factor. 1 RD4EG22 DKRCC.PD.HK.A2.2 / 52H49 Danfoss A/S (RC-CMS / HBS), 1-25
Replacement capacity 12 1 R44A/R57 8 6 4 2 7 6 5 4 3 2 1 1 2 4 8 R44A/R57 +3 C +4 C +5 C.8 1. 1.2 The correction factor can either be multiplied with the valve capacity or the replacement capacity can be divided with the correction factor. Danfoss A/S (RC-CMS / HBS), 1-25 RD4EG22 DKRCC.PD.HK.A2.2 / 52H49 11
Mass flow.8.7.6 R44A/R57 Start opening: t e = + 2 C Mass flow [kg/s].5.4.3.2.1. -6-5 -4-3 -2-1 1 2 3.4 5.4.3 5 Start opening: t e = + 2 C Mass flow [kg/s].3.2 5.2.1 5.1. 5. 1 2 4 8 R44A/R57 +3 C +4 C +5 C.8 1. 1.2 The correction factor can either be multiplied with the valve capacity or the replacement capacity can be divided with the correction factor. 12 RD4EG22 DKRCC.PD.HK.A2.2 / 52H49 Danfoss A/S (RC-CMS / HBS), 1-25
Replacement capacity 8 7 R47C 6 5 4 3 2 1-6 -5-4 -3-2 -1 1 2 3 5 45 4 35 3 25 2 15 1 5 1 2 4 8 R47C +3 C +4 C +5 C.7 1. 1.4 The correction factor can either be multiplied with the valve capacity or the replacement capacity can be divided with the correction factor. Danfoss A/S (RC-CMS / HBS), 1-25 RD4EG22 DKRCC.PD.HK.A2.2 / 52H49 13
Mass flow.5.4 R47C Start opening: t e = + 2 C Mass flow [kg/s].3.2.1. -6-5 -4-3 -2-1 1 2 3.3.25 Start opening: t e = + 2 C Mass flow [kg/s].2.15.1.5. 1 2 4 8 R47C +3 C +4 C +5 C.7 1. 1.4 The correction factor can either be multiplied with the valve capacity or the replacement capacity can be divided with the correction factor. 14 RD4EG22 DKRCC.PD.HK.A2.2 / 52H49 Danfoss A/S (RC-CMS / HBS), 1-25
Replacement capacity 2 18 16 14 12 1 8 6 4 2 R41A 12 1 8 6 4 2 1 2 4 8 R41A +3 C +4 C +5 C.8 1. 1.2 The correction factor can either be multiplied with the valve capacity or the replacement capacity can be divided with the correction factor. Danfoss A/S (RC-CMS / HBS), 1-25 RD4EG22 DKRCC.PD.HK.A2.2 / 52H49 15
Mass flow Mass flow [kg/s].1.9.8.7.6.5.4.3.2.1. R41A Start opening: t e = + 2 C.6.5 Start opening: t e = + 2 C Mass flow [kg/s].4.3.2.1. 1 2 4 8 R41A +3 C +4 C +5 C.8 1. 1.2 The correction factor can either be multiplied with the valve capacity or the replacement capacity can be divided with the correction factor. 16 RD4EG22 DKRCC.PD.HK.A2.2 / 52H49 Danfoss A/S (RC-CMS / HBS), 1-25
Design/Function 1. Bulb with capillary tube 2. Diaphragm element 3. Setting spindle for adjustment of opening point/minimum suction pressure 4. Fixed orifice TUH, Angleway TCHE, Angleway 1. Bulb with capillary tube 2. Diaphragm element 3. Pressure pin seal 4. Two-way balanced port 5. Setting spindle for adjustment of static superheat SS, Straightway Danfoss A/S (RC-CMS / HBS), 1-25 RD4EG22 DKRCC.PD.HK.A2.2 / 52H49 17
Dimensions and weight TUH Connection dimensions, see ordering table. TUH, Angleway - all dimensions in mm Weight.13 kg TCHE Connection dimensions, see ordering table. TCHE, Angleway - all dimensions in mm Weight.15 kg 18 RD4EG22 DKRCC.PD.HK.A2.2 / 52H49 Danfoss A/S (RC-CMS / HBS), 1-25
Dimensions and weight Connection dimensions, see ordering table., Straightway Connection, ODF solder Capillary tube Type Inlet outlet Inlet outlet length H 1 H 2 H 3 H 4 L 1 L 2 L 3 L 4 ød 1 ød 2 Weight in. mm m mm mm mm mm mm mm mm mm mm mm kg 1 5 / 8 5 / 8 16 16 1.5 32 7.5 5 14 45.5 45.5 34.5 7 45 15.39 2 5 / 8 5 / 8 16 16 1.5 37 9 8 122 48 48 38 119 53 16.5.6 4 7 / 8 7 / 8 22 22 3 42 13 11 145 57.5 57.5 41 111 6 2.3.79 8 1 1 / 8 1 1 / 8 28 28 3 47 17 13 165 67 67 44 148 72 2.3 1.34 Danfoss A/S (RC-CMS / HBS), 1-25 RD4EG22 DKRCC.PD.HK.A2.2 / 52H49 19
Application Note: The bulb serves only as a reservoir for the charge, however, it is recommended to mount it in a position where the temperature variation during running conditions is limited (see a and b in the application drawings). 1. Evaporator 2. Condenser 3. Receiver 4. Solenoid valve 5. Discharge bypass valve with adjustable setting 6. Compressor System with capillary tube expansion and internal pressure-equalised hot gas bypass valve, type TUH System with capillary tube expansion and external pressure-equalised hot gas bypass valve TCHE or System with thermostatic expansion valve and external pressure-equalised hot gas bypass valve TCHE or 2 RD4EG22 DKRCC.PD.HK.A2.2 / 52H49 Danfoss A/S (RC-CMS / HBS), 1-25