Replacing The Compressors (Three) Of The Pc Unit - Sanyo SPW-CR1503GDYH8 Technical Data & Service Manual

1. Compressors

1-5. Replacing the Compressors (Three) of the PC Unit

* Never attempt to recover the refrigerant or oil of the faulty unit (PC unit) in another unit (AD unit). See the flowchart in
"1-1. Judging whether a compressor needs to be replaced" and Fig. A (P19).
Start
Turn off the faulty outdoor unit (PC unit)
7
Close the valves (three) of the faulty outdoor unit (balance, liquid, and gas pipe valves)
Change the AD unit quantity settings of the C.C.U.
Short-circuit the AP service pin on the outdoor unit PCB of the faulty outdoor unit, and then turn on
Enable normal operation of the normal outdoor units (backup)
* Canceling of alarm (automatic, requires several minutes)
Recover the refrigerant of the faulty outdoor unit Ref. P VII-4
Recover the oil of the faulty outdoor unit Ref. P VII-4
Turn off the faulty outdoor unit
Replace the compressors
Turn on with the AP service pin on the faulty outdoor unit PCB short-circuited
Inspect for leaks in the faulty outdoor unit
Measure the oil level Ref. P VII-13
Make a vacuum in the faulty outdoor unit Ref. P VII-13
Inject oil and refrigerant Ref. P VII-13
Remove the short-circuit at the AP service pin
Return the AD unit quantity settings of the C.C.U. back to the normal setting
Fully open the valves (3) of the faulty outdoor unit (balance, liquid, and gas pipe valves)
Inject refrigerant until full Ref. P VII-13
Clean the dry core within the system Ref. P VII-13
End
NOTE
1. Ref. P VI-10, Backup Operation, under Control Functions.
2. When the AP service pin is short-circuited, the compressors and fans of the faulty unit (PC unit)
are stopped, the solenoid valves and electronic expansion valves are fully opened, and all trans-
mission is stopped.
3. Be sure to first check the injection amount of the refrigerant and oil, and then check the recovery
amount.
4. If the short-circuit of the AP service pin is removed when the power is left on, transmission with
the C.C.U. is restarted.
5. Even if an alarm (E26) has occurred, operation is restarted when the unit quantity setting is
returned to normal.
The power does not need to be turned on and off again.
6. Perform immediately once the oil and refrigerant are injected.
7. Perform this operation if you were unable to inject the specified amount using the normal injec-
tion procedure.
VII - 12
Replacement of Main Units
1874_M_I
TD831077