5-17. CHECK VALVE.
This task covers:
Tool kit, service, refrigeration unit
Power off at power source.
Both front door assemblies removed. See para 4-17.
General Safety Instructions:
Disconnect input power to the unit before performing any internal maintenance.
Voltages used can kill. Shutting the unit off at the control panel does not
disconnect unit power.
(1) discharge the refrigerant system. See para 5-5.
The complete liquid line assembly may be removed if required for access.
(2) Purge system with nitrogen and debraze the tubing at the check valve. See Figure 5-7 and para 5-6 and 5-
(3) Remove the check valve from the unit.
Blow into the valve on both sides. Air should only pass through the valve one way.
If air passes through valve both ways or if air will not pass either way, the valve is
defective and must be replaced.