4
Basic Operation
*1) Sometimes all outdoor units may stop. If there is operation input, outdoor units other than the target one will
start operation again after approximately
¿
ve minutes. (For details on the settings, see the next item.)
*2) Always carry out the following three tasks.
c
Check to make sure <<Step 2>> is
¿
nished. If the shutoff valve is opened, refrigerant will
À
ow from the
other outdoor unit to the target outdoor unit, causing serious malfunction.
d
After three minutes has elapsed from completion of <<Step 1>>, check to make sure the outdoor main
board displays “
ݕܞݕܝ݆݆
” and then perform this operation. If you turn off the power immediately
after performing “STOP” setting, the entire system will stop. (Backup operation cannot be performed.) If
this happens, see [System recovery procedure], recover the system, and then start over again starting from
<<Step 1>>.
e
There will not be any problem whether the circuit breaker of the outdoor unit in <<Step 3>> is ON or OFF.
Select one of them according to the work required.
[Work example] Perform maintenance on W MULTI outdoor unit 2 in refrigerant system 1.
Refrigerant System 1
Refrigerant
tubing
(main
tubing)
Refrigerant tubing(Outdoor
branch tubing)
W MULTI
outdoor unit
1
Indoor/outdoor
control wiring
<<Step 1>>
<<Step 2>>
<<Step 3>>
W MULTI
outdoor unit
2
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
¿
nished, W MULTI outdoor unit 1 is reset.
(It’ll stop even if it is operating.)
c) After approximately
¿
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.
c
Check to make sure all shutoff valves of refrigerant gas tube, refrigerant liquid tube, and balance tube of the
outdoor unit are opened.
d
Check to make sure the STOP switch (S001) on the outdoor main board is set to “NORM”.
e
If the power of the outdoor unit has been turned off, turn on the circuit breaker.
f
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.)
GHP̲Main̲Parts̲Replacement.indd 4
2012/07/31 17:54:17
