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9-2. FAN CONTROL
By setting the Mode No. 23 in the Function Table in section 9-1, the following patterns of fan control will become possible.
Fan control patterns
CN4Y for FAN control
(PAC-YU25HT)
Disabled
(CN4Y cannot be used with this unit)
*1 While the heater is on, the fan will operate at high speed regardless of the fan setting on the remote controller.
*2 While the heater output is on in the Function Table in section 9-1, the heater will be ON except when the unit is in
communication error, return air thermistor error and motor error.
* If a heater is installed in the duct, do not use Panel heater connector. By doing so, the fan will turn off
when the heater is on, which may result in fire.
9-3. PAC-YU25HT (OPTIONAL PARTS) INSTALLATION
The following section describes installation of the External Heater Adapter that connects to MVZ-A AA4
series indoor unit. This products is the special wiring parts to drive an electric heater with the air conditioner.
(1) Parts list
Check that the following parts are included in the package.
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)
*Panel heater connectors cannot be used with this unit.
(2) Connection to the indoor unit
Use the cables that fit the connectors on the indoor unit control board.
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.
Select the heater output pattern (1st = CN24-1 or 2nd = CN24-2) to use, and connect the cable to the connector
on the indoor unit control board that corresponds to the selection.
Fan in defrost
Mode(function)
No.23(123)
1
STOP(Heater OFF)
2
STOP(Heater OFF)
20
Fan(All modes other
Factory
than defrost)
setting
*2
-
Set(Heater ON
)
*1
*2
High
(Heater ON
)
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