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[Work example] Perform maintenance on W MULTI outdoor unit 2 in refrigerant system 1.
Refrigerant system 1
Refrigerant tube
(outdoor branch tube)
Balance tube
W MULTI
outdoor
unit 1
«Step 1»
«Step 2»
«Step 3»
[System recovery procedure]
If backup operation has been performed, by all means check the following items after the maintenance work, and then
perform settings again to return the system to its normal state.
1) C heck to make sure all shutoff valves of refrigerant gas tube, refrigerant liquid tube, and balance tube of the outdoor
unit are opened.
2) Check to make sure the STOP switch (S001) on the outdoor main board is set to "NORM".
3) If the power of the outdoor unit has been turned off, turn on the circuit breaker.
4) If "Test run" (No.4 - / ) is set, cancel it.
* W hen adjusting to No.4 - / , if TEST/WARNING LED (D052) lights, this means
"Test run" is being set. In this state, press the SET (S007)
key for one second or more. The setting will be canceled
(TEST/WARNING LED (D052) goes off.)
k Engine Stop
Forcibly turns off the thermostat of all operating indoor
units, and stops outdoor units.
(STOP SW (S001) is normally set to "NORMAL.")
1) M ove STOP SW (S001) from "NORMAL" to "STOP"
(Figure 1). " " will appear on the 7- seg-
ment LED display (Figure 2).
On a W MULTI, the 7-segment LED display shown in
Figure 3 (" ") replaces that shown in Fig-
ure 2 (" ") when 3 minutes have elapsed.
2) The all stop operation starts.
Note: D uring all stop, the outdoor unit will not start
even when directed to do so by the indoor unit.
3) T urn off the power supply circuit breaker for the out-
door unit.
l Canceling Engine Stop
1) M ove the STOP SW (S001) from "STOP" to "NOR-
MAL."
2) T urn on the power supply circuit breaker for the out-
door unit. The all stop will be canceled, and the engine
will start.
a) F or the W MULTI outdoor unit 2 indicated in the left diagram, perform «
Step 1 » to « Step 3 » in [Backup operation procedure] in that order. Then,
perform maintenance work on W MULTI outdoor unit 2.
b) W hen « Step 3 » is finished, W MULTI outdoor unit 1 is reset. (It'll stop
even if it is operating.)
c) A fter approximately five minutes, if there is operation input (indoor
W MULTI
remote controller is "Run" or test run setting on outdoor main board), W
outdoor
unit 2
MULTI outdoor unit 1 starts up. (Backup operation starts.)
d) I f test run is set from outdoor main board, W MULTI outdoor unit 1
continues to run. However, if normal operation is started by the indoor
remote controller, depending on the load, all outdoor units may stop due
to thermostat off.
I - 4
Figure 1
Figure 2
Figure 3
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