Mitsubishi Electric CITY MULTI PEFY-P06NMAU-E Technical & Service Manual page 24

[ VII Microprocessor Control ]
(2) On the Fresh air intake type units, the heater cannot be turned on with the fan setting set to OFF.
(3) Non-ducted models do not require the settings described in Section (1) above.
Reference (not applicable to the ducted models)
Pattern
CN4Y or CN22 for FAN control
*1
(YU25)
1 N/A
*1. Refer to Section 5 "Dipswitch Setting" for further information about each switch.
(4) Back-up heating will not be performed when the heater turns on while demand control is performed (not a request item).
(5) 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.
This is applicable only to the R410A series. Make the settings for the following dip switches on the indoor 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 (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
Use the cables that fit the connectors on the indoor unit control board. The items listed in this parts list cannot be used with
the following models.
PMFY-BM
PMFY-AM
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 green 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 either to CN4Y or CN22 as appropriate.
(3) Locally procured wiring
A basic connection method is shown below.
1) PEFY-P-NMSU-E and other models
Remote control board Relay circuit
Electric Heater
or panel
heater
Preparations in the field
HWE09040
NON duct unit (PL/PK/PC)
DIP S/W (Indoor unit)
N/A
Adapter
X
X
(applicable only when a panel
heater is connected)
Maximum cable length
is 10 m (32ft)
- 19 -
Fan in defrost
Stop (Heater ON)
Indoor unit
control board
CN24
Red 1
White 2
CN22 CN4Y
White 1
3
Outdoor unit
control board
• PUHY, PURY-P-
TGMU type Dip
switch SW5-2
"ON"
• PUHY, PURY-P-
YHMU type Dip
switch SW5-10
"ON"
• PUMY series Dip
switch SW4-4
"ON"
GB