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<Operation procedure for charging additional refrigerant>
Refer to the "Service Precautions" label on lid of the EL. COMPO.
BOX 1 of the outdoor unit for operation settings for charging addi-
tional refrigerant
EL. COMPO. BOX 1 (Right side)
"Service Precautions" label
(Surface of EL. COMPO. BOX 1 lid
(right-hand side) )
(1) Fully open the shutoff valve on the gas side (with the shutoff
valve on the liquid side and valve A shown in the above figure
kept closed) to perform the operation of charging additional
refrigerant.
(2) When the specified amount of refrigerant is filled, press the con-
firmation button (BS3) on the PCB (A1P) of the outdoor unit to
stop the operation of charging additional refrigerant.
(3) Fully open the liquid shutoff valve promptly, or otherwise a piping
rupture may result from liquid seal.
[About the refrigerant tank]
Check whether the tank has a siphon pipe before charging and place
the tank so that the refrigerant is charged in liquid form. (See the fig-
ure below.)
With siphon pipe
Stand the tank upright and charge.
(The siphon pipe goes all the way inside,
so the tank does not need be put
upside-down charge in liquid form.)
Other tanks
Stand the tank upside-down and charge.
9-2 Check operation
Take the following procedure to perform the check operation of the air
conditioner.
The following checks are made during the check operation. The air condi-
tioner will not operate normally unless the check operation is performed.
Shutoff valve open check
Wiring mistake check
Piping length check
Check Operation Procedure
(1) Make on-site settings with the Dip switch (DS1-1) on the PCB
(A1P) of the outdoor unit as required.
For details, refer to the information on on-site settings in the ser-
vice precautions label on the EL. COMPO. BOX 1 lid.
(2) Close EL. COMPO. BOX 1 lid and all the front panels other than
that on the EL. COMPO. BOX 1 side, and turn on the outdoor unit
and all the indoor units in the same system. 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 on-site settings with the push button switch (BS1-5) on the
PCB (A1P) of the outdoor unit as required. For details, refer to
the information on on-site settings in the "Service Precautions"
label on the EL. COMPO. BOX 1 lid.
(4) Perform the check operation of the system according to the
"Check Operation Procedure" in the "Service Precautions" label
on the EL. COMPO. BOX 1 lid. After the system operates for
approximately 30 to 40 minutes, the check operation of the sys-
tem will automatically stop. Finish the check operation of the sys-
tem if no malfunction code is displayed on the remote controller
for each unit in the end. Then the air conditioner will be normally
operable in approximately 5 minutes. If a malfunction code is dis-
played, refer to the following list of [Remote controller displays
malfunction code], remedy the problem, and perform the check
operation of the system again.
14
[Remote controller displays malfunction code]
Malfunc-
Installation error
tion code
E3, E4
The shutoff valve of
F3, F6
the outdoor unit is left
UF
closed.
The phases of the
U1
power to the outdoor
unit is reversed.
No power is supplied
U1
to an outdoor or indoor
U4
unit (including phase
LC
interruption).
There is conflict on the
connection of trans-
UF
mission wiring in the
system.
E3
Refrigerant over-
F6
charge.
UF
E4
Insufficient refrigerant.
F3
If the outdoor unit ter-
U7, U4
minal is connected
UF, UH
when there is one out-
door unit installed.
If any malfunction codes other than the above are displayed, check
the service manual for how to respond.
10. TEST RUN
• Make sure the following works are completed in accordance with
the installation manual.
Piping work
Wiring work
Air tight test / Vacuum drying
Additional refrigerant charge
Check operation
• Check that work on all the indoor units, BEV, and outdoor unit is
finished and that it is safe to operate the system.
• After check operation is completed, operate the unit normally and
check the following.
(1) Make sure the indoor and outdoor units are operating nor-
mally.
(2) Operate each indoor unit one by one and make sure the cor-
responding outdoor unit is also operating.
(3) Check to see if cold (or hot) air is coming out from the indoor
unit.
(4) Push the fan direction and strength buttons on the remote
controller to see if they operate properly.
Note
• Heating is not possible if the outdoor temperature is 24°C or
higher. Refer to the Operation manual.
• If a knocking sound can be heard in the liquid compression of the
compressor, stop the unit immediately and then energize the
crank case heater for a sufficient length of time before restarting
the operation.
• Once stopping, the compressor will not restart in about 5 minutes
even if the On/Off button of the remote controller is pushed.
• When the system operation is stopped by the remote controller,
the outdoor units may continue operating for further 5 minutes at
maximum.
• The outdoor unit fan may rotate at low speeds if the Night-time low
noise setting or the External low noise level setting is made, but
this is not a malfunction.
Remedial action
Open the shutoff valve.
Exchange two of the three
phases to make a proper
connection.
Make sure the power source
wire is properly connected to
the outdoor unit and revise if
necessary.
Check if the refrigerant piping
line and the transmission wir-
ing are consistent with each
other.
Recalculate the additional
amount refrigerant from the
piping length and correct the
refrigerant charge level.
• Check if the additional refrig-
erant charge has been fin-
ished correctly.
• Recalculate the additional
amount refrigerant from the
piping length and add the
adequate amount.
Remove the line from the
outdoor multi terminals (Q1
and Q2).
English
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