High voltage can kill.
1. Disconnect power supply.
2. Loosen two panel
fasteners and remove lower panel.
3. Loosen four captive screws and remove junction box with control panel.
4 . Visually examin e relief valve for damage.
The following test should be performed by personnel qualified in
using test equipment capable of handling pressure to 1000 psi.
Use great care to avoid contact with liquid refrigerant or refrigerant
gas being discharged from any container under pressure. Sudden
and irreversible tissue damage can result from freezing. Wear
thermal protective gloves and a face protector or safety glasses in
any situation where skin or eye contact is possible.
Prevent contact of refrigerant gas with flame or hot metal surfaces.
Heat causes the refrigerant to break down and form carbonyl
chloride (phosgene), a highly toxic and corrosive gas. In case of
refrigerant leaks, ventilate area i m m e d i a t e l y .
2. Using an open end wrench remove the pressure relief valve (1) from the
3. Mount pressure relief valve in test fixture.
4. Using a pressure gauge calibrated from 0 to 1000 psig, connect a nitrogen cylinder
to pressure relief valve.
5. Slowly apply nitrogen until gauge indicates 555 psig. Valve should be open at
555 psig +/ 10 percent (500 psig to 610 psig). There should not be leakage at pressures below
500 psig. Adjust valve if not within tolerance.