
62-11785
8–6
b. Checking For Noncondensibles
1. Install a manifold gauge set to allow reading of suction and discharge pressure. See
.
2. Stabilize system to equalize pressure between the suction and discharge side of the system. The refrigerant
system needs to be off for several hours.
3. Measure temperature at the copper tubing leaving the condenser (not the sub-cooler).
4. Record compressor discharge pressure.
5. Determine saturation pressure as it corresponds to the condenser temperature using the temperature pressure
chart,
6. If gauge reading is not close to the calculated saturation pressure in step 5, noncondensibles or mixed
refrigerants are present.
7. Remove refrigerant. Refer to following
.
8. Leak check, evacuate, and recharge the system.
c. Removing Charge
1. Install a manifold gauge set to allow reading of suction and discharge pressure. See
.
WARNING
!
Only a refrigerant cylinder containing R404A should be connected to this refrigeration unit in
order to pressurize the system. However, dry nitrogen may be used to increase pressure. Any
other gas or vapor will contaminate the system and require additional removal and evacuation.
2. Place the unit in Service Mode (Refer to
). Ensure that the operator message panel displays
“RECOVER/LEAK CHK/EVAC MODE” during the refrigerant removal procedures. If the control system switches
to charge mode during the process, switch it back to the “RECOVER/LEAK CHK/EVAC MODE”.
3. Connect a refrigerant recovery device and a clean refrigerant recovery cylinder (or continue to use the same
cylinder used in step 3) as shown in
, and remove any remaining refrigerant from the system.
4. Refer to instructions provided by the manufacturer of the refrigerant recovery unit.
5. After making necessary repairs, leak check, evacuate and recharge the system.
d. Pumping Down The Low Side
Components on the low side of the refrigeration system (the filter drier, EVXV, ECXV, evaporator coil, CSMV, heat
exchanger, suction line etc.) may be serviced or replaced without having to completely remove the refrigerant charge
from the system by pumping down the low side, and temporarily storing the refrigerant in the condenser and receiver.
NOTICE
The scroll compressor achieves low suction pressure very quickly. Do not use the compressor
to evacuate the system below 0 psig. Never operate the compressor with the suction or
discharge service valves closed (frontseated). Internal damage will result from operating the
compressor in a deep vacuum.
1. Install a manifold gauge set to allow reading of suction and discharge pressure. See
.
2. Start the unit.
3. Frontseat the liquid line service valve.
4. Shutdown the unit when the suction pressure drops to 2 psig (0.2 bar). There should be very little refrigerant
remaining in the low side of the system at this point.
5. Monitor the gauges. The suction pressure should not rise rapidly. If the suction pressure continues to rise, the
liquid line service valve may not be properly closed. In this case, the low side cannot be pumped down and the
entire refrigerant charge must be removed from the system. (Refer to preceding step c.)
6. Ensure the unit will not start automatically by placing the START/RUN-OFF switch in the OFF position.
Disconnect the high voltage source and lockout/tagout the receptacle.
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