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occurs, switch it back to the “RECOVER/LEAK CHK/
EVAC MODE” (Refer to Section 5.2.3)
10. Purge nitrogen from system at the suction service
valve.
11. Open the vacuum pump valve and start the pump.
Evacuate unit to 500 microns. Close the vacuum
pump valve and shut off the pump. Wait a few minutes
to be sure the vacuum holds below 2000 microns.
12. If vacuum holds below 2000 microns continue to
step 14. If vacuum rises above 2000 microns contin-
ue to step 13.
13. Repeat steps 8 through 11 until the vacuum stays
below 2000 microns.
14. Once the system holds a good vacuum, it is ready to
be charged with refrigerant. Refer to Section 8.6.2.
b. Evacuation of the Low Side
1. Evacuate only after a low side pressure leak check.
(Refer to Section 8.6.3)
2. If possible keep the temperature of the major com-
ponents (condenser, evaporator, compressor and re-
ceiver) above 60
_
F (15.6
_
C) to speed evaporation of
moisture. If the temperature is lower than 60
_
F
(15.6
_
C), ice might form before moisture removal is
complete. Heat lamps, heat guns or alternate
sources of heat may be used to raise system temper-
ature.
3. The recommended method to evacuate the system is
to connect three evacuation hoses with vacuum
pump and vacuum indicator (see Figure 8
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18).
4. Ensure that the microprocessor MessageCenter dis-
plays “RECOVER/LEAK CHK/EVAC MODE” during
the evacuation and dehydration procedures. (Refer
to Section 5.2.3.) If the microprocessor switches to
charge mode during the process, switch it back to the
“RECOVER/LEAK CHK/EVAC MODE”.
5. Leave the liquid line service valve and the discharge
service valve frontseated and then midseat the suc-
tion service valve.
6. Start the vacuum pump. Evacuate unit until the elec-
tronic vacuum gauge indicates 2000 microns. Close
the vacuum pump valve and shut off the pump. Wait a
few minutes to be sure the vacuum holds.
7. Break the vacuum with dry nitrogen through the liquid
line service valve. Raise system pressure to approxi-
mately 2 psig (0.1 bar). Ensure that the micropro-
cessor does not switch to the Charge Mode. If this oc-
curs, switch it back to the “RECOVER/LEAK
CHK/EVAC MODE” (Refer to Section 5.2.3
8. Purge nitrogen from the low side of the system at the
suction service valve.
9. Open the vacuum pump valve and start the pump.
Evacuate unit to 500 microns. Close the vacuum
pump valve and shut off the pump. Wait a few minutes
to be sure the vacuum holds below 2000 microns.
10. If vacuum holds below 2000 microns continue to
step 12. If vacuum rises above 2000 microns contin-
ue to step 11.
11. Repeat steps 6 through 9 until the vacuum stays be-
low 2000 microns.
12. Once the system holds a good vacuum, open the
compressor discharge service valve and the liquid
line service valve.
13. Start unit and check the refrigerant charge. Refer to
Section 8.6.2.
c. Evacuation of the Compressor
1. Evacuate only after a compressor pressure leak
check. (Refer to Section 8.6.3.)
2 Ensure the unit will not start automatically by dis-
abling any two way communication and placing the
Main Power switch in the OFF position. Disconnect
the high voltage source and lockout/tagout the re-
ceptacle.
3. If possible keep the temperature of the compressor
above 60
_
F (15.6
_
C) to speed evaporation of mois-
ture. If the temperature is lower than 60
_
F (15.6
_
C),
ice might form before moisture removal is complete.
Heat lamps, heat guns or alternate sources of heat
may be used to raise compressor temperature.
4. Connect evacuation equipment to the compressor
suction and discharge service valves. See
Figure 8
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18.
5. Start the vacuum pump. Evacuate compressor to 500
microns. Close the vacuum pump valve and shut off
the pump. Wait a few minutes to be sure the vacuum
holds. This checks for residual moisture and/or leaks.
6. Once the compressor holds a good vacuum, open the
compressor suction and discharge service valve to
allow refrigerant to enter the compressor.
7. Start unit and check the refrigerant charge. Refer to
Section 8.6.2.
8.7 COMPRESSOR AND UNLOADER SERVICE
8.7.1 Repair or Replacement Determination
Certain operating conditions or refrigeration system
components may be misdiagnosed and subsequently
lead to the determination that the compressor requires
replacement. These conditions or components should
be checked prior
to replacing a compressor and after a
replacement compressor is installed to prevent
replacement compressor damage. To determine if
compressor replacement or repair is required, do the
following:
a. If the compressor is operational, check the refrigerant
charge, refer to Section 8.6.2.
b. If the compressor is operational, check operation of
the unloaders, refer to Section 8.7.6.
c. If the compressor is operational, check the system
components as follows:
1. Install gauges to allow reading of receiver, suction
and discharge pressure. See Figure 8
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18.
2.
Start the unit in cooling so that compressor operates.