Carrier NDK33BN0KB, Руководство по эксплуатации и обслуживанию

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62-61753-21 5-3
5.1.3 Service Mode
CAUTION
Service Mode MUST be used whenever re-
moving refrigerant charge, refrigerant leak
checking or evacuating.
NOTE
The Start/Run-Off switch (SROS) MUST be in
the START/RUN position to keep unit in Ser-
vice Mode. If the switch is placed in the OFF
position, the unit exits Service Mode and clos-
es the Compressor Suction Modulating Valve
(CSMV) and Evaporator Expansion Valve
(EXV) to 0% open and de-energizes the
Economizer Solenoid Valve (ESV).
To enter Service Mode:
a. Enter the Technicians Configuration/Test Mode
(refer to Section 5.1) and select SERVICE MODE.
b. ENTERING SERVICE MODE will appear in the
MessageCenter.
When entering Service Mode the microprocessor
opens the CSMV and EXV to 100% open and energiz-
es ESV.
c. Once the valves are open, "RECOVER / LEAK CHK
/ EVAC MODE" is displayed in the MessageCenter.
d. Refrigerant recovery, leak checking, or evacuation
may be performed on the unit at this time. Refer to
Service Procedures in Section 8.5.
e. The unit should remain in the RECOVER / LEAK
CHK / EVAC MODE as these service procedures
are performed. If the unit shifts to Charge Mode and
"CHARGE MODE-HOLD = TO EXIT" is displayed in
the MessageCenter, DO NOT perform refrigerant
recovery, leak checking, or evacuation. Exit Service
Mode and then re-enter, making sure that "RE-
COVER / LEAK CHK / EVAC MODE" is displayed in
the MessageCenter before continuing any of these
service procedures.
f. The microprocessor will monitor the pressure trans-
ducer readings during evacuation. Once all pressure
transducers (CDP, CSP and EVOP) have dropped
below 0.68 Bar (-20 inhg) and then 2 of the 3 pres-
sure transducers rise above 0.34 Bar (5 PSIG), the
microprocessor will close the CSMV and EXV to 0%
open and de-energize ESV. When the valves are
closed, "CHARGE MODE-HOLD = TO EXIT" is dis-
played in the MessageCenter. This action is taken to
prevent refrigerant migration to the compressor dur-
ing charging,
g. To exit Service Mode at any time, press and hold
the = key for 3 seconds. "EXITING SERVICE
MODE" will then appear in the MessageCenter.
When exiting Service Mode the microprocessor closes
the CSMV and EXV to 0% open and de-energizes
ESV.