Panasonic 2WAY Multi - Page 9

II–3
[Work example] Perform maintenance on W MULTI outdoor unit 2 in refrigerant system 1 in Figure 1.
a) For 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) When <<Step 3>> is fi nished, W MULTI outdoor unit 1 is reset. It’ll stop
even if it is operating.)
c) After approximately fi ve minutes, if there is operation input (indoor
remote controller is “Run” or test run setting on outdoor main board), W
Multi outdoor unit 1 starts up. (Backup operation starts.)
d) If 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.
[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.

Check to make sure all shutoff valves of refrigerant gas tube, refrigerant liquid tube, and balance tube of the
outdoor unit are opened.

Check to make sure the STOP switch (S001) on the outdoor main board is set to “NORM”.

If the power of the outdoor unit has been turned off, turn on the circuit breaker.

If “Test run” (No.4 Test- Cool/Heat) is set, cancel it.
* When adjusting to No.4 Test-Cool or Heat, 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.)
Refrigerant System 1
Refrigerant tubing
(main tubing)
Refrigerant tubing(Outdoor
branch tubing)
W MULTI
outdoor unit
1
Indoor/outdoor operation wiring
<Procedure 1>
<Procedure 2>
<Procedure 3>
W MULTI
outdoor unit
2
Refrigerant System 1
Refrigerant tubing
(main tubing)
Refrigerant tubing(Outdoor
branch tubing)
W MULTI
outdoor unit
1
Indoor/outdoor operation wiring
<Procedure 1>
<Procedure 2>
<Procedure 3>
W MULTI
outdoor unit
2
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