Mitsubishi Electric PUHZ-W90VHA Service Manual page 37

8-8. FUNCTION OF SWITCHES
Switch
Function
mark No.
Forced
1
defrosting
To clear error
2
history
SW1
3 No function
4 No function
5 No function
6 No function
1 Model Setting 1
Defrost control
2
selection
SW6
3~6 Model Setting 2
Energy saving
1 Mode selection
Cooling only,
Cooling only or
SW8 2 Heating only or
Reversible
To fix operation
3
mode
<Important Note>
All these dip switches on PUHZ-W90VHA are set as shown above.
Spare PCBs, however, will be supplied without any settings, which means that all dip switches are switched OFF.
When servicing, please make sure to set all switches correctly, referring to the previous PCB which is removed from the unit.
*1. Forced defrosting should be done as follows.
Change the DIP SW1-1 on the outdoor controller board from OFF to ON.
Forced defrosting will start by the above operation
• Heat mode setting
• 10 minutes have passed since compressor started operating or previous forced defrosting finished.
• Pipe temperature is less than or equal to 8 .
• Forced defrosting will finish if certain conditions are satisfied.
Forced defrosting 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.
Selection
ON (with) OFF (without)
ON to start Usual setting
ON to clear Usual setting
Do NOT use PUHZ-W90VHA
Do NOT use PUHZ-W90VHA
Do NOT use PUHZ-W90VHA
Do NOT use PUHZ-W90VHA
Do NOT use PUHZ-W90VHA
For high
Standard
humidity
SW6
3 4 5 6
1 0 1 0
1=ON, 0=OFF
Powerful mode
mode
Reversible
Heating only
Cooling only Heating only
Initial setting* Function details
Switch ON to forced defrosting
OFF
Switch ON to clear (erase) the followings:
(1)Error codes and Suspension flags in RAM
OFF
(2)Error codes and Suspension flags in
EEPROM
OFF
OFF
OFF
OFF
OFF PCB may be damaged, if switched ON.
Switch ON to change conditions (standard /
OFF
high himidity) to start defrosting
As shown in
the left table
OFF
To select Cooling only, Heating only or
OFF Reversible
OFF To fix as Cooling Only or Heating Only
if these conditions written below are satisfied.
37
Effective timing
(SW1, 8) /
Note (SW6)
When compressor
is working in heating
mode.*1
off or operating
–
ON for other models
Make sure to set
SW6-3 to 6 correctly
–
–
–
–
Always
Always
Always