Mitsubishi Electric CITY MULTI PEFY-P06NMAU-E4 Technical & Service Manual page 30

[ VII Microprocessor Control ]
(1) Turning on the heater with the fan setting set to OFF requires that the DIP S/W and connectors on the indoor units are set on
site.
Fan control
CN22 for
Pattern FAN control
(PAC-YU25HT)
1
Disabled
2
3
Enabled
4
*1 Heater will not operate during all error modes.
*2 The fan speed in the Heating Thermo-OFF mode depends on the settings of DIP-SW 1-7 and 1-8. Refer to VIII-[1]-5-1
Function setting.
*3 While the heater is on, the fan will operate at high speed regardless of the fan setting on the remote controller.
*4 The fan speed depends on the settings of the remote controller. The heater turns on regardless of the fan speed.
*5 The fan stops and the heater turns off, depending on the type of error.
* If a heater is installed in the duct, do not use CN22. By doing so, the fan will turn off when the heater is on,
which may result in fire.
(2) Back-up heating will not be performed when the heater turns on while demand control is performed (not a request item).
(3) This is applicable only to the R410 series. Make the settings for the following dip switches on the outdoor unit control board
before switching on the power.
2. PAC-YU25HT (Optional Parts) installation
The following section describes installation of the External Heater Adapter that connects to CITY MULTI air conditioner R410A
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.............................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)
HWE20150
DIP DIP
in error *1 *5
SW3-2 SW3-4
(Indoor (Indoor
Fan
unit) unit)
OFF FAN ON *2
High
(DIP SW1-7: ON
and SW1-8: OFF)
or
(DIP SW1-7: OFF
and SW1-8: ON)
ON
ON
Very low
(DIP SW1-7: OFF
and SW1-8: OFF)
STOP
(DIP SW1-7: ON and
SW1-8: ON)
OFF FAN ON *2
ON FAN ON *2
in defrost
Heater Fan
OFF Stop
High
(DIP SW1-7: ON
and SW1-8: OFF)
ON
or
(DIP SW1-7: OFF
and SW1-8: ON)
Very low
(DIP SW1-7: OFF
and SW1-8: OFF)
OFF
STOP
(DIP SW1-7: ON and
SW1-8: ON)
OFF Stop
ON Stop
- 23 -
All modes other than
defrost and error
Heater Fan Heater
OFF High *3 ON
In heating Thermo-Off
Fan Heater
High
ON
(DIP SW1-7: ON
and SW1-8: OFF)
ON
or
(DIP SW1-7: OFF
and SW1-8: ON)
Very low
(DIP SW1-7: OFF
and SW1-8: OFF)
OFF
OFF
STOP
(DIP SW1-7: ON
and SW1-8: ON)
OFF
*4
ON
ON
GB