Mitsubishi Electric M Series Service Manual page 25

(3) Wiring
A basic connection method is shown below.
Remote control board Relay circuit
Electric Heater
or panel
heater
Preparations in the field
The length of the electrical wiring for the CN24RELAY-KIT-CM3 is 2 meters (6-1/2 ft.)
To extend this length, use sheathed 2-core cable.
Control cable type: CVV, CVS, CPEV or equivalent.
2
Cable size: 0.5 mm ~ 1.25 mm
Don't extend the cable more than 10 meters (32ft)
Recommended circuit
Wiring diagram
(4) 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.
Adapter
X
X
(applicable only when a panel
heater is connected)
Maximum cable length
is 10 m (32ft)
y y
2
(16 to 22 AWG)
R
1-phase
S
power supply
208V, 230V/60Hz
R
S
Control board
CN24-1 or CN24-2
23
Indoor unit
control board
CN24
Red 1
White 2
CN4Y
White 1
3
y
H1
FS1
FS2
88H
H2
FS1
FS2
88H
26H
88H
FS1, 2 ----- Thermal fuse
H1, H2 ----- Heater
26H --------- Overheat
protection thermostat
88H --------- Electromagnetic contactor
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