External Heater - Mitsubishi Electric CITY MULTI PKFY-P NBMU-E2 Serie Para El Instalador

6. External Heater

DIP SW
OFF
SW1-5
ON Thermo ON/OFF signal *1
*1. When using the free contact function of TG-2000, set SW1-5, SW1-9, and
SW1-10 to ON.
Electric Heater Relay circuit
Electric
Heater
Preparations in the field
Fig. 6-1
88H
L1
1-phase
power supply
208V, 230V/60Hz
L2
CN52
Indoor unit
control board
Fig. 6-2
CN52-2 output signal
External heater signal
Adapter
PAC-SA88HA
x
x
+ -
FS1 H1
FS2 H2
26H
88H
FS1, FS2 ......Thermal fuse
H1, H2 ..........Heater
26H ...............Overheat protection
thermostat
88H ...............Electromagnetic contactor
In this function, the external signal can be extracted from CN52. To use the
external heater, set SW1-5 of the address board to OFF (factory setting).
6.1. Connecting external output cable
Use the cable with the connector that fits the connector on the indoor unit control
board.
• External output cable (PAC-SA88HA)
This cable is used to connect the relay circuit that is used for an inter locked
operation of indoor unit and electric heater. Connect the cable to connector CN52
on the indoor unit control board.
6.2. Locally Procured Wiring
A basic connection method is shown. Please refer to the service manual for details.
Indoor unit
control board
CN52
BROWN
1
RED
2
ORANGE
3
YELLOW
4
GREEN
5
Not for use.
Insulate it securely with insulation
tape or something similar.
Maximum cable length
is 10 m (32 ft)
• For relay X use the specifications given bellow Operation coil
Rated voltage: 12VDC
Power consumption: 0.9W or less
* Use the diode that is recommended by the relay manufacturer at both of the
relay coil.
• The length of the electrical wiring for the PAC-SA88HA is 2 meters (6-1/2 ft)
To extend this length, use sheathed 2-core cable.
Control cable type: CVV, CVS, CPEV or equivalent.
Cable size: 0.5 mm to 1.25 mm
2
Don't extend the cable more than 10 meters (32 ft)
• Recommended circuit (Fig. 6-2)
6.3. Wiring Restrictions
Keep the length of the cable connecting to the circuit board of the indoor unit
shorter than 10 meters (32 ft). Longer than 10 meters (32 ft) could cause improper
operation.
Use a transit relay when extending wiring such as remote wiring.
Outdoor unit
control board
For the dip switch setting, refer to
"6.4. Dip switch setting for outdoor
units and indoor units".
(16 to 22 AWG)
2
9