Mitsubishi Electric PCA Series Service Manual page 35

11-2. BACK-UP HEATING FUNCTION
11-2-1. Operation
The back-up heater turns ON when both of the following conditions have been satisfied:
A) When the room temperature has not risen after the heater ON delay time has passed.
Note: The heater ON delay time starts when the condition of "set temperature
room temperature ] 3°F [1.5:]
B) Set temperature
The back-up heater turns OFF when the following condition has been satisfied:
room temperature ] 1°F [0.5:]
Set temperature
Set temp. room temp. 1°F [0.5:]
11-2-2. How to change the heater ON delay time
You can set these function by wired remote controller.
Note that the change can be made only by the wired remote controller PAR-32MAA.
Notes:
1. Both main and sub unit should be set in the same setting.
2. Every time replacing indoor controller board for serving, the function should be set again.
3. Stop the air-conditioner operation before changing the heater ON delay time.
Request code list
Setting No.
Setting contents
(Request code)
No.1 Monitoring the request
code of current setting
390)
No.2
10 minutes
391
No.3
15 minutes
392
No.4
20 minutes
393
No.5
25 minutes
394
11-2-3. How to connect
When connecting to the connector CN24 of the indoor unit, use PAC-SE56RA-E (optional parts).
Note: For a twin indoor unit system, connect to the CN24 of the indoor unit that the remote controller is connected to.
OCH638
Heater output ON
The heater output turns ON
when both the conditions A and B
have been satisfied.
Heater output OFF
3°F [1.5:]
Initial setting
35
room temperature > 1°F [0.5:]" has been satisfied.