Backup Operation During Maintenance Work (For W Multi - Panasonic U-16GE2E5 Manual

(4) Basic Operations for Periodic Inspection Work
All work other than when the STOP (all stop) switch (S001) is set to STOP and the VG (fuel solenoid valve forced off
switch) switch (S002) is set to OFF should be performed with the HOME (S004), SET (S007), UP (S005), and DOWN
(S006) keys.
It is extremely dangerous if the customer performs an operation that runs the engine during a maintenance inspection
or when not expected. Make sure you stop operation during work in the way described below.
* Pressing the HOME (S004) key for 1 second or more forcefully returns the state to the initial state. The
value of a partially set item will be discarded, and the item number will return to "
* If there is no operation for 10 minutes when other than the "
a partially set item will be discarded, and the item number will return to "

Backup operation during maintenance work (for W MULTI)

• What is backup operation?
In the GHP W MULTI series, multiple outdoor units are connected to the same refrigerant tube. Therefore, even
during maintenance work of an outdoor unit, the other outdoor unit not required in maintenance work can be
used to keep the indoor operating conditions. This is called a backup operation.
• Backup operation procedure
To perform backup operation, the outdoor unit for maintenance work (hereafter referred to as "target outdoor
unit") must be cut off from the system using the following procedure. Review content of the maintenance work
and then select the most suitable method.Also, after the maintenance work is nished, always refer to [System
recovery procedure] and then return the system to its normal state.
[Backup operation procedure]
To turn off power of target outdoor unit and then perform maintenance work
(basic operation during inspection of outdoor unit)
« Important »
This is the basic operation performed during inspection work. If this operation is not performed and the
power of the outdoor unit is turned off, this will cause system fault and prevent backup operation to be car-
ried out, and serious malfunction will occur. If this happens, see [System recovery procedure] to recover the
system, and then once again use the following procedure to perform setup. Automatic backup operation will
kick in.
« Step 1 »
On the outdoor main board of the target
outdoor unit, set the STOP switch (S001) to
"STOP". *1
« Step 2 »
(After con rming that the engine of the target
outdoor unit is stopped) close the valves of re-
frigerant gas tube, refrigerant gas liquid tube,
and balance tube.
« Step 3 »
On the outdoor main board of the target
outdoor unit, set the STOP switch (S001) to
"STOP". Wait for three minutes or more and
then turn off the circuit breaker of the target
outdoor unit. *2
Start maintenance work.
" item number is displayed, the value of
* 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.
Check to make sure « Step 2 » is nished. If the shut-
off valve is opened, refrigerant will ow from the other
outdoor unit to the target outdoor unit, causing serious
malfunction.
After 3 minutes has elapsed from completion of « Step
1 », check to make sure the outdoor main board displays
" " 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 ».
There will not be any problem whether the circuit break-
er of the outdoor unit in « Step 3 » is ON or OFF. Select
one of them according to the work required.
I - 3
."
."