• Caution when servicing the switch box
1. Be sure to check using a tester that the power supply is turned off at a terminal
strip before service inspection.
2. Be aware that temperature of switch boxes can be extremely high.
3. Do not touch the switch box for another 1 O minutes after turning off the circuit
breaker. Even after 10 minutes, always measure the voltages at the terminals of
main circuit capacitor or electrical parts and make sure that those voltages are 50V
DC or less.
(Always touch the earth terminal first before pulling out or plugging in connectors in
order to discharge static electricity. This to prevent the PCB from being damaged.
FAN
-coNNECTORS
--- EARTH TERMINAL
4. After confirming the main circuit capacitor voltage drop, pull out the outdoor unit fan
connector, make sure not to touch any live parts during this action. (strong adverse
winds which let the outdoor unit fan rotate, induce a risk of electrical shock because
the fan rotation makes the capacitor store electricity.
• Caution when performing other servicing
Do never connect power supply cables to compressors (U,V,W) or fan motor directly.
(Failure to connect the power supply to the PC board may cause the compressor or
fan motor to burn out.)
• Total refrigerant charging (Details please see service manual} In
case of
RZFQ12s,140
v
series
CD Turn ON refrigerant recovery mode by remote control
Please refer [field setting] from remote control installation manual.
Setting content
Mode No.
Setting switch No.
Setting position No.
Refrigerant recovery mode
01
I
03
setting
16(26)
7
I
OFF
ON
® After setting CD, power supply will be intercepted after 1 minute passed.
*
It turn on power supply before@ � ® are completed refrigerant recovery mode is
turned OFF, the refrigerant cannot be recovered or charged regularly.
In case charge power supply unwillingly, please set refrigerant mode as ON by
remote control again.
@ Please recover the refrigerant until becoming 0.09Mpa (gauge pressure: -0.011 Mpa) or
less by the refrigerant recovery machine from stop valve service port (liquid . gas side}
at the same time.
@ Exchange service parts modify leak point.
® Perform airtightness test . air- purge.
Please refer installation manual of outdoor unit or service manual.
® Charge refrigerant amount selected by table 1 from liquid stop valve service port.
Caution Do not turn on power during evacuation. The motor may be damaged due to vacuum
discharge.
*
In other hands, Recovery mode can set from button at outdoor side.
Table 1. Charge refrigerant amount
(After a leak, etc ... )
64
How to execute a pumping-down
(for example, when moving or reinstalling an indoor or outdoor unit)
The outdoor unit is equipped with a high pressure switch to protect the compressor.
I
Caution
I
Never short-circuit the high pressure switch during pump-down operation.
• It is not allowed to let the refrigerant out into the air.
The refrigerant should be recovered completely.
• Although pumping-down operation allows most of the refrigerant to be
be recovered in a short period of time, some refrigerant will remain
inside the indoor unit and the refrigerant piping. Using a refrigerant recovery
machine, recover remaining refrigerant from the stop valve service port until
the pressure falls to 0.09 MPa. (gauge pressure:- 0.011 MPa) or less.
• Be sure to execute the pumping-<:lown before refrigerant piping and wiring
is taken off.
• Preparation for pumping-down operation
A1P
INSULATION
SHEET
• For pumping-down operation
1. Make sure to cut off power supply.
Open the front panel and cover the PCB and terminal board with insulation sheet to avoid electric
shock by accidental touching of live parts.
2. Close the front panel before leaving the outdoor unit. You cannot leave the unit unattended in case
the front panel remains opened.
3. Turn on the power supply and carry out pumping-down operation according to the following
procedure.
inspection from the
PUSH SWITCH FOR
PUMP DOWN(BS2)
?SEGMENT
DISPLAY
� Do not remove the indoor unit until pump operation finish.
l,ll (It is dangerous when indoor fan automatically starts the operation.)
Perform pumping-down operation using the following procedure
1
2
3
4
Procedure
Precaution
Confirm that stop valves both
liquid and gas sides are open.
Push the pumping-down button
Compressor and outdoor unit fan will start
operation automatically. Indoor fan may
(B82) on the PC board of the
automatically start running. Pay attention
outdoor unit for 5 seconds.
to this
Close the stop valve on the liquid • Do never leave the outdoor unit unattended
side securely about 2 minutes after with opened front panel when power supply
the compressor started operation.
is on.
Once the compressor operation
• In case the stop valve on the liquid side is not
stops after 2 to 5 minutes, close the securely closed during compressor operation,
stop valve on the gas side securely. pumping-down operation can not be executed.
When you work alone, carry out after closing
Turn off the power supply.
the front plate, After turning the power supply
off, remove the insulation sheet.
• If after finishing pumping-down operation the outdoor unit
does not operate, even when the remote controller switch
is turned on, the remote controller and ?segment display
may or may not indicate "U4" But it is not a malfunction.
• When in need of operation, tum off the main power supply
and turn it on again. make sure that stop valves both on liquid
and gas sides are open and be sure to operate the unit is cooling
operation during test run.
Liq.
stv. valve Gas stv.
valve
� When installing and relocating, be sure to install the earth leakage breaker to protect
Lil
from the electric shock disaster and fire due to leakage of electricity. For installing the
earth leakage breaker. request to the qualified electrician.
13.2 CAUTION (RZVFQ125,140 A
Y
16, RZFQ125, 140 A
Y
16)
opening to prevent electric shock.
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