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6
HEATER CONTROL
6-1. Control specifications and Function setting
Table 1 shows how the field-installed heater is controlled. Select the desired pattern in the table below, and set the
Function on the indoor units as shown in Table 1.
Table.1 [Function table]
Select unit numbers 01 to 03 or all units (AL[wired remote controller] / 07[wireless remote controller])
Mode
Heater OFF
Heater control
Inlet air temp.
Heater ON
Inlet air temp. < set temp.-4.5˚F(2.5˚C)
The fan will stop and the heater will turn off when
[DEFROST] or [ERROR] is displayed.
Inlet air temp.
Heater output
Heater OFF
Inlet air temp.
Heater ON
Inlet air temp. < set temp.-1.8˚F(2.5˚C)
The fan will drive and the heater will turn on when
[DEFROST] or [ERROR] is displayed.
Inlet air temp.
Heater output
*Refer to the Installation Manual for function settings.
6-2. Fan control
By setting the Mode No. 23 in the Function Table in section 6-1 to 2 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.
* 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
Very low
Fan control
STOP
Remote controller setting
*Refer to the Installation Manual for function settings.
Setting
set temp.
Set temp.
Set temp.-1.8
Set temp.-4.5
ON
OFF
set temp.
Set temp.
Set temp.-1.8
ON
OFF
Heater is installed in the duct.
Unused*
Fan ON*1
Fan ON*1
Setting
[DEFROST] or [ERROR]
Very low
Remote controller setting
Remote controller setting
12
Mode no. Setting Initial setting
23
1
˚
F(1
˚C
)
˚
F(2.5
˚C
)
23
2
˚
F(2.5
˚C
)
No heater is installed in the duct.
Used
Fan OFF
Fan OFF
Mode no.
Setting
Initial setting
25
1
25
2
25
3
-
-
-
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