Trane Technologies Thermo King Advancer A360 - Three-Way Valve Condenser Pressure Bypass Check Valve

98
TK 61753-2-MM-EN
Figure 46. High Pressure Cutout Manifold
1.
Relief Valve (66-6543)
2. O-Ring (33-1015)
3.
Adapter Tee Weather Head No. 552X3
Three-Way Valve Condenser Pressure Bypass Check Valve
A three-way valve condenser pressure bypass check valve is used in this unit. This check valve controls the bypass flow
of refrigerant gas between the condenser inlet line and the compressor discharge line.
The check valve is closed when the unit is running on cool, or whenever the discharge pressure is higher than the
condenser pressure.
When the unit is running on defrost or heat, if the condenser pressure is higher than the discharge pressure, the check
valve opens and the condenser pressure is bled off until it drops to the level of the discharge pressure. The purpose of
the valve is to improve the three-way valve response time when shifting from heat to cool.
If a three-way valve does not shift back to cool immediately after the pilot solenoid closes, and finally shifts to cool
when the temperature rise puts the unit into high speed, the three-way valve end cap should be checked. See “Three-
Way Valve Repair,” p. 115 in Refrigeration Service Operations.
Check the operation of the condenser pressure bypass check valve as follows:
1. Remove the condenser pressure bypass check valve cap from the three-way valve.
2. Using a screwdriver, gently turn the check valve stem in until the valve is front seated.
3. Install a gauge manifold set on the compressor.
4. Close (front seat) the receiver tank outlet valve.
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