Function Of Switches, Connectors And Jumpers - Mitsubishi Electric MXZ-8B48NA Technical & Service Manual

9-8. FUNCTION OF SWITCHES, CONNECTORS AND JUMPERS

(1) Function of switches
MXZ-8B48NA MXZ-8B48NAR1
Type of
No.
Switch
Switch
1
2
Abnormal history clear
3
4
Dip
SW1
switch
5
(Indoor unit selection)
6
1
SW4
2
Test run mode setting
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 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: [46 °F].
3 Forced defrost will finish if certain conditions are satisfied.
w 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.
Function
Forced defrost
No function
ON
1 2 3 4 5 6
Indoor No.1
ON
1 2 3 4 5 6
Indoor No.4
ON
1 2 3 4 5 6
Indoor No.7
<Example>
OC
Self-diagnosis
A
IC
RC
Indoor
No.1
BC#1 : branch box controller unit Number 1
BC#2 : branch box controller unit Number 2
Test run
The black square ( ) indicates a switch position.
Action by the switch operation
ON
Start
Clear
—
ON
1 2 3 4 5 6
Indoor No.2
ON
1 2 3 4 5 6
Indoor No.5
ON
1 2 3 4 5 6
Indoor No.8
BC#1 (5- branch type)
BC#2 (3- branch type)
B C D E A
IC IC
R
RC
C
Indoor Indoor
No.2 No.3
1 blinking LED2 (branch box controller board)
2 blinking LED2 (branch box controller board)
Operating
Heating
62
Effective timing
OFF
When compressor is
Normal
working in heating
operation.
Normal
off or operating
—
ON
1 2 3 4 5 6
Indoor No.3
ON
1 2 3 4 5 6
Indoor No.6
Indicating a particular
self-diagnosis
B C
IC IC
R R
C C
Indoor Indoor
No.4 No.5
OFF
Under suspension
Cooling
—