Temperature Difference
(Z = set temp. – room temp.)
CN 24 Out Put
1
Z
≤
0°C (°F)
0Vdc (OFF)
2
Z
≥
0
≤
2.5°C (4.5°F)
maintains current out put
3
Z
≥
2.5°C (4.5°F)
12Vdc (ON)
5
Wiring Restrictions
Keep the length of the cable connecting to the circuit board of the indoor unit shorter than 10 meters (32ft).
Longer than 10 meters (32ft) could cause improper operation.
Use a transit relay when extending wiring such as remote wiring.
CN24
X
+
–
X
Remote control Board
Relay circuit
Adapter
Indoor unit
control board
Electric
Heater
Red
1
White
2
Preparations in the field
Maximum cable length
is 10 m (32ft)
Connection to the Indoor Unit
3
Locally Procured Wiring
4
Elect
r
ic Hea
te
r
po
w
er sour
ce
Yellow
Outline of functions
The back-up heater signal is sent out according to the temperature difference between set temperature and indoor room temperature.
This function is available only in heating operation.
NOTE:
In defrost, hot adjust and power off mode the output on CN 24 will be 0VDC
(1) external output cable (with yellow connectors)
This cable is used to connect the relay circuit that is used for an interlocked operation of indoor unit and electric heater. Connect the cable
to connector
CN24
on the indoor unit control board.
A basic connection method is shown.
(i.e. interlocked operation with the electric heater).
For relay X use the specifications given below Operation coil
Rated voltage: 12VDC
Power consumption: 0.9W 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-
SE56RA-E
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
2
~1.25mm
2
(16 to 22 AWG)
Don’t extend the cable more than 10 meters (32ft)
