Mitsubishi Electric Mr.SERVICE PUHZ-HRP71VHA Service Manual page 26

10-1. Refrigerant recovering (pump down)
Perform the following procedures to recover the refrigerant when moving the indoor unit or the outdoor unit.
1 Turn on the power supply (circuit breaker).
w When power is supplied, make sure that "CENTRALLY CONTROLLED" is not displayed on the remote controller. If
"CENTRALLY CONTROLLED" is displayed, the refrigerant recovering (pump down) cannot be completed normally.
2 After the liquid stop valve is closed, set the SWP switch on the control board of the outdoor unit to ON. The compressor
(outdoor unit) and fans (indoor and outdoor units) start operating and refrigerant recovering operation begins. LED1 and
LED2 on the control board of the outdoor unit are lit.
w Set the SWP switch (push-button type) to ON in order to perform refrigerant recovering operation only when the unit is
stopped. However, refrigerant recovering operation cannot be performed until compressor stops even if the unit is stopped.
Wait 3 minutes until compressor stops and set the SWP switch to ON again.
3 Because the unit automatically stops in about 2 to 3 minutes after the refrigerant recovering operation (LED1 is not lit and
LED2 is lit), be sure to quickly close the gas stop valve.
w In case the outdoor unit is stopped when LED1 is lit and LED2 is not lit, open the liquid stop valve completely, and then
repeat step 2 3 minutes later.
w If the refrigerant collecting operation has been completed normally (LED1 is not lit and LED2 is lit), the unit will remain
stopped until the power supply is turned off.
4 Turn off the power supply (circuit breaker).
10-2. Unit replacement operation (except for PUHZ-HRP·HA2R1)
When reusing the existing pipes that carried R22 refrigerant for the HRP71, HRP100 and HRP125 models, replacement
operation must be performed before performing a test run.
1 If new pipes are used, these procedures are not necessary.
2 During replacement operation, "C5" is displayed on "A-Control Service Tool (PAC-SK52ST)".
Replacement operation procedures
1 Turn on the power supply.
2 Set DIP switch SW8-2 on the control board of the outdoor unit 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 blink together.
3 Replacement operation requires at least 2 hours to complete.
• After setting switch SW8-2 to ON, the unit automatically stops after 2 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 control board.
4 Set switch SW8-2 to OFF. (Replacement operation is completed.)
w The unit can be operated normally by remote controller even if SW8-2 remains ON.
w If the indoor temperature is less than 15:, the compressor will operate intermittently but the unit is not faulty.
10-3. Start and finish of test run
• Operation from the indoor unit
Execute the test run using the installation manual for the indoor unit.
• Operation from the outdoor unit
By using the DIP switch SW4 on the control board of outdoor unit, test run can be started and finished, and its operation
mode (cooling/heating) can be set up.
1 Set the operation mode (cooling/heating) using SW4-2.
2 Turn on SW4-1 to start test run with the operation mode set by SW4-2.
3 Turn off SW4-1 to finish the test run.
• There may be a faint knocking sound around the machine room after power is supplied, but this is
no problem with product because the linear expansion pipe is just moving to adjust opening pulse.
• There may be a knocking sound around the machine room for several seconds after compressor
starts operating, but this is no problem with product because the check valve itself generates the
sound because pressure difference is small in the refrigerant circuit.
Note:
The operation mode cannot be changed by SW4-2 during test run. (To change test run mode, stop the unit by SW4-1,
change the operation mode and restart the test run by SW4-1.)
is displayed on the remote controller and LED1 (green) and LED2 (red) on the
TEST RUN
26
<SW4>
ON
OFF
1 2
Stop Operation
Cooling Heating