Mitsubishi Electric Mr.SLIM PEAD-A24AA Service Manual page 20

(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: 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-YU25HT 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.
X
X
2
(16 to 22 AWG)
R
1-phase
S
power supply
208V, 230V/60Hz R
S
Control board
CN24
Indoor unit
control board
Adapter
CN24
Red 1
White 2
CN4Y
White 1
3
(applicable only when a panel
heater is connected)
Maximum cable length
is 10 m (32ft)
H1
FS1
FS2
88H
H2
FS1
FS2
88H
26H
88H
20
FS1, 2 ----- Thermal fuse
H1, H2 ----- Heater
26H --------- Overheat
protection thermostat
88H --------- Electromagnetic contactor