TK 61753-2-MM-EN
99
Figure 47. Three-way Valve Condenser Pressure Bypass Check Valve
1. Check Valve
2. Heating/Defrost Position
3. Cooling Position
5. Operate the unit on cool and pump down the low side to 20 in. Hg (-0.68 bar)of vacuum.
6. Stop the unit. The condenser and suction pressures should remain stable, indicating no leaks.
7. Shift the three-way valve to the heat position. The low side gauge will raise slightly. The high side gauge will drop
to approximately zero. The gauges will equalize.
8. The gauges will remain in this position, approximately zero, if the three-way valve seals properly toward the
condenser and the condenser pressure bypass check valve seals properly.
9. Back seat condenser pressure bypass check valve stem against the snap ring. Both gauges should rise indicating
the condenser pressure bypass check valve is properly releasing condenser pressure into the discharge tube and
evaporator.
10. Replace the cap on the condenser pressure bypass check valve.
NNoottee:: Valve stem MUST be back seated during normal unit operation.
11. Open the receiver tank return outlet valve, remove the gauges and return the unit to normal operation.
Electronic Throttling Valve (ETV)
The Electronic Throttling Valve (ETV) is standard on the these units. The ETV is a variable position valve operated by a
stepper motor. The ETV is located in the suction line between the accumulator and the suction vibrasorber. The ETV
system also uses discharge and suction pressure transducers, and a hot gas bypass valve.
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