Refrigeration Service Operations (Rev 1/99)
70
5. Pressurize the low side and test for leaks. If no leaks
are found, evacuate the low side.
LOW PRESSURE CUTOUT SWITCH
Removal
1. Pump down the low side and stop the unit.
2. Disconnect the wires and remove the switch.
Installation
1. Apply a refrigerant locktite to the threads of the switch.
2. Install and tighten the switch and reconnect the wires.
3. Pressurize the refrigeration system and test for leaks.
4. If no leaks are found, evacuate the low side.
5. Open the receiver tank outlet valve, start the unit and
check the refrigerant charge.
SUCTION PRESSURE REGULATOR
VALVE
Removal
1. Pump down the low side and equalize the pressure to
slightly positive.
2. Release the remaining pressure and unsolder the suc-
tion pressure regulator valve from the suction tubes.
Installation
1. Clean the tubes for soldering.
2. Place the valve in position and solder the connections.
3. Pressurize the low side and check for leaks.
4. If no leaks are found, evacuate the low side.
5. Open the refrigeration valves, and place the unit in
operation. Check refrigerant charge and add refrigerant
as required.
REPLACING REFRIGERANT HOSES
Disassembly
1. Remove the refrigerant charge or pump down the low
side.
2. Use two wrenches to loosen the fittings.
3. Remove the hose and remove the fittings from the hose.
Assembly
1. Measure the hose, and using a sharp knife or suitable
plastic tube and hose cutter tool, cut to length. Make
sure the cut is clean and square. Wipe the inside of the
hose clean.
NOTE: DO NOT use a saw to cut the hose.
Cut Hose
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