Carrier Transicold X4 7300, Operation & Service Manual, Page: 97 / 282

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5.2.5 Service Mode
CAUTION
!
Service Mode MUST be used whenever removing refrigerant charge, refrigerant leak checking
or evacuating.
NOTE
If the START/RUN - OFF switch is toggled to the OFF position, the System will exit Service Mode.
To enter Service Mode:
a. Enter the Technicians Menu, highlight SERVICEMODE and then press the “=” key as described in Figure
5.1 .
b. “TRANSITION TO SERVICE MODE” and then “ENTERINGSERVICE MODE” will display in the operator
message panel. When entering Service Mode the control system brings the CSMV and EVXV to 100%open
and energizes SV2 & UL1.
c. Once the CSMV and EVXV are 100% open, “ RECOVER/ LEAK CHK / EVAC MODE” is displayed in the
operator message panel.
d. Refrigerant recovery, leak checking, or evacuation may be performed on the unit at this time. Refer to Ser-
vice Procedures in Section 8 .
e. The unit should remain in the RECOVER / LEAK CHK/ EVAC MODE as refrigerant recovery or leak testing
procedures are performed.
f. If the message in the operator message panel changes to “CHARGE MODE - HOLD = TO EXIT” do not
continue refrigerant recovery, leak testing or evacuation procedures. Exit Service Mode and then re-enter,
ensuring that “RECOVER / LEAK CHK /EVAC MODE” is displayed in the operator message panel before
continuing refrigerant recovery or leak testing.
g. During evacuation, the control system will monitor the pressure transducer readings.
• The System will remain in “RECOVER / LEAKCHK / EVAC MODE” as evacuation is started.
• As the refrigeration system is evacuated, the system pressure will go into a deep vacuum. Once the CSP is
less than 20 inhg and the CDP is less than+5 psig the operator message panel will change to “EVAC/
CHARGE MODE”. The position of the CSMV, EVXV, SV2 & UL1 do not change in this mode.
• Following the evacuation, as the charging procedures are started the control system will bring the CSMV
and EVXV to 0% open and de–energize SV2& UL1 when both of the transducers rise above+5psig (0.34
bar).
• When the CSMV and EVXV are closed, “CHARGE MODE – HOLD = TO EXIT” is displayed in the operator
message panel. This action is taken to prevent refrigerant migration to the compressor during charging.
h. To exit Service Mode at any time, press the EXIT softkey. “EXITING SERVICE MODE” will then display in
the operator message panel. When Service Mode is exited, the control system brings the CSMV and EVXV
to 0% open and SV2 & UL–1 will be de–energized.
NOTICE
Technician Mode should be canceled when work is complete. If Technician Mode is not can-
celed, Technician Mode will be available for 60 minutes after the last key press without requir-
ing a code, even after placing the SROS in the OFF and then back in the RUN/STOP position.
i. Once activity requiring use of Technician Mode is complete, Technician Mode should be manually canceled,
refer to Figure 5.1 .