Mitsubishi Electric PUHZ-FRP71VHA2 Service Manual page 54

10-10. FUNCTION OF SWITCHES, CONNECTORS AND JUMPERS
(1) Function of switches
Type
of Switch No. Function
switch
1 Manual defrost
2 Abnormal history clear
3
SW1
4
Dip
switch
Refrigerant address setting
5
6
1 Test run
SW4
2 Test run mode setting
Push
SWP Pump down
switch
*1
Manual defrost should be done as follows.
1 Change the DIP SW1-1 on the outdoor controller board from OFF to ON.
2 Manual defrost will start by the above operation 1 if all these conditions written below are satisfied.
• Heat mode setting
• 10 minutes have passed since compressor started operating or previous manual defrost is finished.
• Pipe temperature is less than or equal to 8°C.
Manual defrost will finish if certain conditions are satisfied.
Manual defrost can be done if above conditions are satisfied when DIP SW1-1 is changed from OFF to ON.
After DIP SW1-1 is changed from OFF to ON, there is no problem if DIP SW1-1 is left ON or changed to OFF again.
This depends on the service conditions.
OCH665B
Action by the switch operation
ON
*1
Start
Clear
ON ON
1 2 3 4 5 6 1 2 3 4 5 6
0
ON ON
1 2 3 4 5 6 1 2 3 4 5 6
4
ON ON
1 2 3 4 5 6 1 2 3 4 5 6
8
ON ON
1 2 3 4 5 6 1 2 3 4 5 6
12
Operating
ATA Heating
Start
The black square ( ) indicates a switch position.
OFF
Normal
Normal
ON ON
1 2 3 4 5 6 1 2 3 4 5 6
1 2
ON ON
1 2 3 4 5 6 1 2 3 4 5 6
5 6
ON ON
1 2 3 4 5 6 1 2 3 4 5 6
9 10
ON ON
1 2 3 4 5 6 1 2 3 4 5 6
13 14 15
OFF
ATA Cooling
Normal
54
Effective timing
When compressor is working
in ATA heating and ATW
heating operation.
OFF or operating
3
7
When power supply ON
11
OFF
OFF
*1