Installation manual
18
ERQ125~250A7W1B
Inverter condensing unit
4PW51323-1C – 2018.04
Check operation procedure
1
Close the electric box lid and all front panels except the one on
the side of the electric box.
2
Turn on the power to the outdoor unit, control box and air
handling units. Be sure to turn the power ON at least 6 hours
before operation in order to have power running to the crank
case heater.
3
Make the field setting as needed using the push buttons on the
PCB (A1P) of the outdoor unit. Refer to
4
Set the check operation (without initial refrigerant decision)
following setting mode 2 in the field setting and perform the
check operation.
The system operates for ±30 minutes and automatically stops
the check operation.
If no malfunction code is displayed on the remote controller
after the system has stopped, check if the operation is
completed. Normal operation will be possible after 5 minutes.
If a malfunction code is displayed on the remote controller,
correct the malfunction and perform the check operation
again as decribed in
"Correcting after abnormal completion of
the test operation" on page 18
Test operation procedure
1
Close all front panels except the front panel of the electric box.
2
Turn ON the power to all outdoor units and the connected air
handling units.
Be sure to turn on the power 6 hours before operation in order to
have power running to the crank case heater and to protect the
compressor.
3
Make the field setting as described in the paragraph
4
Press the
button once, and set to the SETTING
MODE (H1P LED = OFF).
5
Press and hold the
button down for 5 seconds or
more. The unit will start the test operation.
The test operation is automatically carried out in cooling
mode, the H2P LED will light up and the messages "Test
operation" and "Under centralized control" will display on the
remote controller.
It may take 10 minutes to bring the state of the refrigerant
uniform before the compressor starts.
During the test operation, the refrigerant running sound or the
magnetic sound of a solenoid valve may become loud and
the LED display may change, but these are not malfunctions.
During the test operation, it is not possible to stop the unit
operation from a remote controller. To abort the operation,
press the
button. The unit will stop after
±30 seconds.
6
Close the front panel in order to let it not be the cause of
misjudgement.
7
Check the test operation results by the LED display on the
outdoor unit.
8
When the test operation is fully completed, normal operation will
be possible after 5 minutes.
Otherwise, refer to
"Correcting after abnormal completion of the
to take actions for correcting the
abnormality.
Correcting after abnormal completion of the test operation
The test operation is only completed if there is no malfunction code
displayed on the remote controller. In case of a displayed malfunction
code, perform the following actions to correct the abnormality:
Confirm the malfunction code on the remote controller
After correcting the abnormality, press the
button
and reset the malfunction code.
Carry out the test operation again and confirm that the
abnormality is properly corrected.
13. S
ERVICE
MODE
OPERATION
Vacuuming method
At the first installation, this vacuuming is not required. It is required
only for repair purposes.
1
When the unit is at standstill and under the setting mode 2, set
the required function B (refrigerant recovery operation/
vacuuming operation) to
(ON).
- After this is set, do not reset the setting mode 2 until the
vacuuming is finished.
- The H1P LED is on and the remote controller indicates
(test operation) and
(external control) and the
operation will be prohibited.
2
Evacuate the system with a vacuum pump.
3
Press the
button and reset the setting mode 2.
Refrigerant recovery operation method
by a refrigerant reclaimer
1
When the unit is at standstill and under the setting mode 2, set
the required function B (refrigerant recovery operation/
vacuuming operation) to
(ON).
- The air handling unit and the outdoor unit expansion valves
will fully open and some solenoid valves will be turned on.
- The H1P LED is on and the remote controller indicates
(test operation) and
(external control) and the
operation will be prohibited.
H1P H2P H3P H4P H5P H6P H7P
Normal completion
x x w x x x x
Abnormal completion
x w w x x x x
BS1 MODE
BS4 TEST
BS3 RETURN
Installation error
Error code
Remedial action
The stop valve of an
outdoor unit is left
closed.
E3
E4
F3
UF
Check referring to the table in
"11.4. Additional refrigerant charge"
on
The phases of the
power to the outdoor
units are reversed.
U1
Exchange two of the three phases
(L1, L2, L3) to make a positive
phase connection.
No power is supplied
to an outdoor unit,
control box or air
handling unit
(including phase
interruption).
U1
U4
Check if the power wiring for the
outdoor units are connected
correctly.
(If the power wire is not connected
to L2 phase, no malfunction display
will appear and the compressor will
not work.)
Incorrect
interconnections
between units
UF
Check if the refrigerant line piping
and the unit wiring are consistent
with each other.
Refrigerant
overcharge
E3
F6
UF
Recalculate the required amount of
refrigerant from the piping length
and correct the refrigerant charge
level by recovering any excessive
refrigerant with a refrigerant
recovery machine.
Insufficient refrigerant
E4
F3
Check if the additional refrigerant
charge has been finished correctly.
Recalculate the required amount of
refrigerant from the piping length
and add an adequate amount of
refrigerant.
BS3 RETURN
ON
BS1 MODE
ON
4PWEN51323-1C_2018_04.book Page 18 Thursday, May 31, 2018 9:12 PM
