Brochure

Catalog CIC-2003-1/US
Parker Hannifin Corporation
Climate & Industrial Controls Group
Cleveland, OH
189
Service
& Check
Valves
Thermostatic and Constant Pressure (Automatic) Expansion Valves
TXVs & AXVs
Problem: Voltage to the valve is low, liquid is in the
suction line.
Probable cause: Solder or other electrically
conductive material has clogged the thermistor.
Problem: Voltage to the valve is high, superheated
condition at the thermistor location.
Probable cause: Some contaminant is shorting the
thermistor out of the circuit.
Problem: Voltage will not drop below 17 volts and
goes as high as 26 volts.
Probable cause: Transformer output too high.
Valve Replacement
Always replace a defective electric valve with an exact
duplicate.
Mounting
If possible, install the valve with the head within 30 de-
grees of upright. This prevents any liquid from migrat-
ing to the bimetal chamber where it could affect valve
operation.
If the valve is mounted with the head down, an electric
valve with a bleed tube connection must be used.
Bleed Connection
The third solder connection on solder-type electric
valves is the bleed connection. It prevents migration of
liquid refrigerant to the bimetal chamber. A valve with a
bleed tube must always be used on heat pumps.
Connect the bleed tube downstream of the thermistor
in the system suction line as shown in the illustration
below. On heat pumps, connect the bleed tube to the
common suction line.
Remember to use a chill block or wet cloths to protect
the valve body when soldering.
Valve Ratings
The following ratings are based on 100°F (38° C) vapor-free liquid refrigerant entering the valve.
Refrigerant R-134a/R-12/R-401A, B
Tons of Refrigeration — Evaporator Temperatures ° F/C
To determine valve ratings for other liquid refrigerant temperatures entering the valve, multiply the capacities listed above by the proper multiplier
factor listed.
Thermal Electric ValvesTroubleshooting
Optional
Bleed
Connection
625
Electric
Valve
Evaporator Coil
Compressor
Condenser Coil
Receiver
Part Orifice
Number Size 40 60 80 100 120 60 80 100 120 140 80 100 120 140 160 100 120 140 160 180
040925-023 .040 .274 .335 .387 .433 .476 .318 .368 .411 .450 .486 .335 .374 .410 .442 .473 .332 .364 .393 .420 .446
040925-014 .047 .530 .650 .750 .840 .923 .618 .715 .798 .875 .945 .648 .725 .794 .857 .917 .642 .703 .760 .812 .862
040925-013 .062 .735 .900 1.04 1.07 1.28 .860 .995 1.11 1.22 1.31 .905 1.01 1.11 1.20 1.28 .895 .980 1.06 1.13 1.20
040925-025 .070 .875 1.07 1.24 1.39 1.52 1.00 1.16 1.30 1.42 1.53 1.04 1.16 1.27 1.37 1.46 1.00 1.09 1.18 1.26 1.34
040925-002 .078 1.36 1.66 1.92 2.15 2.36 1.58 1.82 2.04 2.23 2.41 1.65 1.85 2.02 2.19 2.34 1.64 1.79 1.94 2.07 2.20
040925-003 .093 1.87 2.29 2.65 2.96 3.26 2.15 2.49 2.78 3.04 3.29 2.26 2.53 2.77 2.99 3.20 2.21 2.42 2.61 2.79 2.96
040925-004 .109 2.29 2.80 3.24 3.63 3.98 2.64 3.05 3.41 3.73 4.04 2.74 3.07 3.36 3.63 3.88 2.65 2.90 3.14 3.35 3.55
040925-001 .125 2.65 3.25 3.75 4.20 4.61 3.05 3.53 3.94 4.31 4.66 3.14 3.51 3.84 4.15 4.44 3.03 3.32 3.58 3.83 4.06
040925-005 .140 3.01 3.68 4.25 4.75 5.23 3.42 3.78 4.42 4.84 5.23 3.52 3.93 4.30 4.65 4.96 3.40 3.72 4.03 4.30 4.56
040925-028 .187 4.42 5.41 6.25 7.00 7.68 5.04 5.83 6.51 7.13 7.70 5.17 5.78 6.33 6.84 7.32 5.00 5.47 5.92 6.32 6.71
1.07
1.00
0.93
Multiplier FactorLiquid Refrigerant Temp Entering Valve
110°F (43°C)
Liquid Refrigerant Temp Entering Valve
90°F (32°C)
100°F (38°C)
80°F (27°C)
PRESSURE DROP ACROSS VALVE (PSIG)
0.71
120°F (49°C)
130°F (54°C)
140°F (60°C)
0.87
0.81
Multiplier Factor
1.11
+20°F (-7°C) -10°F (-23°C) -40°F (-40°C)+40°F (+4°C)