Installation manual
14
ERQ125~250A7W1B
Inverter condensing unit
4PW51323-1C – 2018.04
1
Charge with the outdoor unit at standstill
1.
Calculate how much refrigerant to be added using the formula
explained in the chapter
"4.2 How to calculate the additional
refrigerant to be charged" on page 6
2.
Open valve C (valves A and B and the stop valves must be left
closed) and charge the required amount of refrigerant through
the liquid side stop valve service port.
When the required amount of refrigerant is fully charged,
close valve C. Record the amount of refrigerant that was
added on the additional refrigerant charge label provided with
the unit and attach it on the back side of the front panel.
Perform the test procedure as described in
.
2
Normal system display
3
Remote controller malfunction code display
Remote controller heating mode malfunction codes
Remote controller cooling mode malfunction codes
11.5.
Checks after adding refrigerant
Are the stop valves for both liquid and gas open?
Is the amount of refrigerant, that has been added, recorded?
NOTE
See
"11.3. Stop valve operation procedure" on
for details on how to handle stop valves.
The refrigerant charging port is connected to the
piping inside the unit.
The unit's internal piping is already factory
charged with refrigerant, so be careful when
connecting the charge hose.
After adding the refrigerant, do not forget to close
the lid of the refrigerant charging port.
The tightening torque for the lid is 11.5 to
13.9 N•m.
In order to ensure uniform refrigerant distribution,
it may take the compressor ±10 minutes to start
up after the unit has started operation. This is not
a malfunction.
LED
display
(Default
status
before
delivery)
Micro-
computer
operation
monitor
Mode
Ready
/Error
Cooling/Heating
changeover
Low
noise Demand Multi
Indivi-
dual
Bulk
(master)
Bulk
(slave)
HAP
H1P
H2P
H3P
H4P
H5P
H6P
H7P
H8P
Single outdoor
unit system
c x x w x x x x x
Error code
P8
recharge
operation
Close valve A immediately and press the TEST OPERATION
button once.
The operation will restart from the charging mode judgement
onwards.
P2
charge
hold
Close valve A immediately. Check
following items:
- Check if the gas side stop valve is
opened correctly
- Check if the valve of the refrigerant
cylinder is opened
- Check if the air inlet and outlet of the
air handling unit are not obstructed
After correcting the
abnormality, restart
the automatic
charging procedure
again.
Error code
PA
,
PH
,
PC
replace
cylinder
Close valve A and replace the empty cylinder. When renewed,
open valve A (the outdoor unit will not stop operating).
The code on the display shows the unit where a cylinder is to be
renewed:
PA
= master unit,
PH
= slave unit 1,
PC
= slave unit 2, flashing
PA
,
PH
and
PC
= all units
After recplacing the cylinder, open valve A again and continue the
work.
P8
recharge
operation
Close valve A immediately.
Restart the automatic charging procedure again.
P2
charge
hold
Close valve A immediately. Check
following items:
- Check if the gas side stop valve is
opened correctly
- Check if the valve of the refrigerant
cylinder is opened
- Check if the air inlet and outlet of the
air handling unit are not obstructed
- Check if the indoor temperature is not
lower than 20°C DB
After correcting the
abnormality, restart
the automatic
charging procedure
again.
*
abnormal
stop
Close valve A immediately. Confirm the
malfunction code by the remote controller
and correct the abnormality by following
the
"Correcting after abnormal completion
of the test operation" on page 18
.
Make sure to open the stop valves after charging the
refrigerant.
Operating with the stop valves closed will damage the
compressor.
Error code
4PWEN51323-1C_2018_04.book Page 14 Thursday, May 31, 2018 9:12 PM
