Panasonic 2WAY Multi Technical & Service Manual page 9

[Work example] Perform maintenance on W MULTI outdoor unit 2 in refrigerant system 1 in Figure 1.
Refrigerant System 1 Refrigerant System 1
Refrigerant tubing(Outdoor Refrigerant tubing(Outdoor
branch tubing) branch tubing)
W MULTI W MULTI
W MULTI W MULTI
outdoor unit outdoor unit
outdoor unit outdoor unit
1 1
<Procedure 1> <Procedure 1>
<Procedure 2> <Procedure 2>
<Procedure 3> <Procedure 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.
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.)
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
2 2
remote controller, depending on the load, all outdoor units may stop due
to thermostat off.
II–3