Mitsubishi Electric PEAD Series Service Manual page 33

HEATER CONTROL
(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
1-phase
power supply
208V, 230V/60Hz
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.
HWE2109A
Adapter
X
X
(applicable only when a panel
heater is connected)
Maximum cable length
is 10 m (32ft)
2
(16 to 22 AWG)
R
S
88H
R
S
88H
88H
Control board
CN24
33
Indoor unit
control board
CN24
Red 1
White 2
CN4Y
White 1
3
H1
FS1
FS2
H2
FS1
FS1, 2 ----- Thermal fuse
FS2
H1, H2 ----- Heater
26H
26H --------- Overheat
88H --------- Electromagnetic contactor
protection thermostat