Mitsubishi Electric CITY MULTI PVFY-P12NAMU-E Technical & Service Manual page 26

[ 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
Pattern
CN22 for FAN control (YU25)
1 Disabled
(CN22 cannot be used with
2
this unit)
*1. While the heater is on, the fan will operate at high speed regardless of the fan setting on the remote controller.
* 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 (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.
(3) Locally procured wiring
A basic connection method is shown below.
Remote control board Relay circuit
Electric Heater
or panel
heater
Preparations in the field
For relay X use the specifications given below Operation coil
Rated voltage: 12VDC
Power consumption: 1W or less
* Use the diode that is recommended by the relay manufacturer at both ends of the relay coil.
The length of the electrical wiring for the PAC-YU25HT is 2 meters (6-1/2 ft.)
HWE1405A
PVFY-NAMU-E
DIP S/W3-4 (Indoor unit)
OFF
ON
Adapter
X
X
Maximum cable length
is 10 m (32ft)
- 19 -
Fan in defrost
Stop (Heater OFF)
Stop (Heater OFF)
Indoor unit
control board
CN24-1 or CN24-2
Red 1
White 2
Fan (All modes other
than Defrost)
Set (Heater ON)
*1
High (Heater ON)
Outdoor unit
control board
• PUHY, PURY-P-TGMU
type Dip switch SW5-2
"ON/OFF"
• PUHY, PURY-P-THMU/
YHMU/TJMU/YJMU type
Dip switch SW5-10 "ON/
OFF"
• PUHY, PURY-P-TKMU/
YKMU type Dip switch
SW4: 932 "ON/OFF"
• PUMY series
Dip switch SW4-4
"ON/OFF"
GB