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11
TEST RUN • REPLACEMENT OPERATION & EMERGENCY OPERATION
11-1. Test run • replacement operation
11-1-1. Check points
• After installation of indoor and outdoor units, piping work and electric wiring work, re-check that there is no refrigerant
leakage, loosened connections and wrong polarity.
• Check if there is no phase interruption to the power supply.
• Measure impedance between the ground and the terminal block(L, N) of the outdoor power board by 500V Merger and
check that it is 1.0MΩ or more. If the indoor unit is equipped with a heater, also check the terminal block(L, N) of the heater
power board.
w Don't use 500V Merger to the indoor/outdoor connecting wire terminal block(S1, S2, S3) and the remote controller terminal
block(1, 2). This may cause a malfunction.
Insulation Resistance
• The insulation resistance may get down to around 1.0MΩ as the liquid refrigerant collects in the compressor right after the
installation of units or if the units are left for a long time with the main power OFF. In that case, there is no abnormality on
units. Follow the procedure below.
1 Measure the insulation resistance of the compressor itself by disconnecting any wires from it.
2 It is considered that the insulation resistance will get down due to the collected refrigerant in the compressor or the
defective compressor when the insulation resistance is below 1.0MΩ.
3 Start warming up the compressor by turning on the main power supply after connecting all the wires to the compressor
again. Measure the insulation resistance again after supplying electricity to the compressor during the time indicated below.
a) Warming-up time needed to get the insulation resistance back to 1.0MΩ or more from the insulation resistance decline:
2 to 3 hours (More time may be needed due to the outside temperature conditions or the refrigerant collected conditions.)
b) Warming-up time needed to prevent the compressor from failure when the compressor is started with some refrigerant
collected in compressor: 12 hours or more
4 If the insulation resistance is back to 1.0MΩ or more, the compressor is not defective.
• Make sure that the test run switch (SW4) on the outdoor controller board is set to OFF before turning on the power supply.
• Turn on the power supply 12 hours before operation in order to protect the compressor.
• For specific models which require higher ceiling settings or auto-recovery feature from power failure, make proper changes
on settings by referring to the description of "Selection of Function through Remote Controller".
• Check if there is something wrong with the outdoor unit. LED1 & LED2 on the outdoor controller board flashes if the outdoor
unit is in a trouble.
• Open both the stop valve of liquid/gas pipes completely.
• The surface of DIP switch is covered with the protection sheet. Uncover the protection sheet to make the switch controlled
more easily.
After checking the above points, conduct the test run by following the procedure written in the below section. Make sure to
read the operation manual before the test run. (Especially items to secure safety.)
11-1-2. Replacement operation
• When reusing the existing pipes that carried R22 refrigerant for the RP4, RP5 and RP6 models, replacement
operation must be performed before performing a test run.
1 If new pipes are used, these procedures are not necessary.
2 If existing pipes that carried R22 refrigerant are used for the RP3 model, these procedures are not necessary.
(The replacement operation cannot be performed.)
3 During replacement operation, "C5" is displayed on "A-Control Service Tool(PAC-SK52ST)". (This is applied to only RP4,
RP5 and RP6 models.)
• Replacement operation procedures
1 Turn on the power supply.
2 Set DIP switch SW8-2 on the outdoor controller board to ON to start replacement operation.
• The replacement operation is performed using the cooling system. Cool air will flow from the indoor unit during the replace-
ment operation.
• During the replacement operation,
control board of the outdoor unit flash together.
3 Replacement operation requires at least two hours to complete.
• After setting switch SW8-2 to ON, the unit automatically stops after two hours.
• Replacement operation can be performed repeatedly by setting switch SW8-2 from OFF to ON. Make sure to perform the
operation more than 2 hours. (If the operation is performed less than 2 hours, the existing pipes cannot be cleaned
enough and the unit may be damaged.)
• If replacement operation is performed over 2 hours, this action is recorded into nonvolatile memory of controller board.
4 Set switch SW8-2 to OFF. (Replacement operation is completed.)
wThe unit can be operated normally by remote controller even if SW8-2 remains ON.
wIf the indoor temperature is less than 15:, the compressor will operate intermittently but the unit is not faulty.
is displayed on the remote controller and LED1 (green) and LED2 (red) on the
TEST RUN
86
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