62-11039 5-14
5.2.3 Service Mode
CAUTION
Service Mode MUST be used whenever re-
moving refrigerant charge, refrigerant leak
checking or evacuating.
NOTE
Unit Start/Run--Off switch (RS) MUST be in
Start/Run position to keep unit in Service Mode.
If the switch is turned OFF, the unit exits Ser-
vice Mode and closes CSMV to 0% open and
de--energizes UL1.
a. Press = key when SERVICE MODE appears in the
MessageCenter.
b. ENTERING SERVICE MODE will appear in the
MessageCenter.
When entering Service Mode the microprocessor opens
the CSMV to 100% open and energizes UL1.
c. Once the CSMV is 100% 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 8.10.2.
e. To prevent refrigerant migration to the compressor
during charging, if all pressure transducers (CSP
and CDP) drop below –20 inHg (0.68 Bar), and
then 3 of the 4 pressure transducers rise above 5
PSIG (0.34 Bar), the microprocessor will close the
CSMV to 0% open and de-energize UL1. When the
valve is closed,
“CHARGE MODE – HOLD = TO EXIT” is displayed
in the MessageCenter.
f. 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
at this time. Exit Service Mode and then re-enter,
making sure that
“RECOVER / LEAK CHK / EVAC MODE” is
displayed in the MessageCenter before performing
any of these services.
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 to 0% open and de-energizes UL1.
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