Mitsubishi Electric PEAD Series Service Manual page 26

HEATER CONTROL
9-2. FAN CONTROLL
By setting the Mode No. 11 in the Function Table in section 9-1 and using CN4Y on the optional parts PAC-YU25HT, the
following patterns of fan control will become possible when [DEFROST] or [ERROR] is displayed.
Fan control patterns when [DEFROST] or [ERROR] is displayed
Use of CN4Y (PAC-YU25HT)
Heater is off.
Heater is on.
While the heater is on, the fan will operate at high speed regardless of the fan setting on the remote controller, except
when the unit isoperated in the DEFROST mode or when the unit is in error.
* If a heater is installed in the duct, do not use CN4Y. By doing so, the fan will turn off when the heater is on,
which may result in fire.
*1 Fan speed setting
Mode
Heating Thermo-OFF
Fan control
Remote controller setting
*Refer to the Installation Manual for function settings.
9-3. PAC-YU25HT (OPTIONAL PARTS) INSTALLATION
The following section describes installation of the External Heater Adapter that connects to PEAD-A·AA7 series indoor
unit. This products is the special wiring parts to drive an electric heater with the air conditioner.
(1) Parts list
1) External output cable (with a yellow connector).............................2 in total
Two types of cables with different connectors are included.
2) Panel heater connector.................................................................. 3 in total
White: 1
Green: 2 (2 types)
(2) Connection to the indoor unit
1) External output cable (with a yellow connector)
This cable is used to connect a relay circuit for an interlocked operation with either an electric or a panel heater.
Connect the cable to CN24 on the indoor unit control board.
2) Panel heater connector (with a white connector)
This connector is used to perform an interlocked operation with a panel heater. Depending on the indoor unit control board
specification, connect the cable to CN4Y as appropriate
<Image>
CN4Y for FAN control
(PAC-YU25HT)
HWE16080
Heater is installed in the duct.
Unused*
Fan OFF
Fan ON*1
Setting
[DEFROST] or [ERROR]
Very low
STOP Remote controller setting
Remote controller setting
No heater is installed in the duct.
Mode no.
Very low 25
25
25
26
Used
Fan OFF
Fan OFF
Setting Initial setting
1 ○
2 -
3 -