Function Of Switches; Cooling - Mitsubishi Electric PUZ-A18NHA4 Service Manual

10-10. FUNCTION OF SWITCHES, CONNECTORS AND JUMPERS

(1) Function of switches

Type
No.
Function
of Switch
switch
1
Forced defrost 1
2
Abnormal history clear
3
4
SW1
Dip
Refrigerant address
switch
setting
5
6
1
Test run
SW4
2
Test run mode setting
1
No function
SW8 2
No function
Separate indoor/outdoor
3
unit power supplies
Push
SWP
Pump down
switch
w1 Forced defrost should be done as follows.
1 Change the DIP SW1-1 on the outdoor controller board from OFF to ON.
2 Forced 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 forced defrost finished.
· Pipe temperature is less than or equal to 8°C [46°F].
Forced defrost will finish if certain conditions are satisfied.
Forced 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.
Action by the switch operation
ON
Start
Clear
ON ON
1 2 3 4 5 6 1 2 3 4 5 6
0 1
ON ON
1 2 3 4 5 6 1 2 3 4 5 6
4 5
ON ON
1 2 3 4 5 6 1 2 3 4 5 6
8 9
ON ON
1 2 3 4 5 6 1 2 3 4 5 6
12 13
Operating
Heating
—
—
Used
Start
71
The black square (
OFF
Normal
Normal
ON ON
1 2 3 4 5 6 1 2 3 4 5 6
2 3
ON ON
1 2 3 4 5 6 1 2 3 4 5 6
6 7
ON ON
1 2 3 4 5 6 1 2 3 4 5 6
10 11
ON ON
1 2 3 4 5 6 1 2 3 4 5 6
14 15
OFF

Cooling

—
—
Not used
Normal
■
) indicates a switch position.
Effective timing
When compressor is operating
in heating operation. 1
Off or operating
When power supply ON
Under suspension
—
—
When power supply ON
Under suspension