Mitsubishi Electric PUHY-P250YHM-A Data Book page 35

● Caution on using the external input function (20HP only)
Caution
When using the external input function on the indoor unit that is connected to
a two-refrigerant circuit, connect the short-circuit plate that is supplied with the
unit to the appropriate terminals on the external input-output board.
Without the short-circuit plate, the unit will not function properly.
Don't connect the short-circuit plate in case of a one-refrigerant circuit.
· Connecting the short-circuit plate
<The case of with-voltage input>
TB23
AC A1 A2
External input
<The case of no-voltage input>
TB23
AC A1 A2
<Dehumidification command>
Adapter for
Indoor unit remote display
controller circuit board (PAC-SA88HA)
CN52
External input-output board
CN53 CN54
Short-circuit plate
TB21 TB22
BC B1 B2
COM 1 2
External input-output board
CN53 CN54
Short-circuit plate
TB21 TB22
BC B1 B2
COM 1 2
External input
Relay circuit
5 Green
Z Z
1 Brown
SW : Dehumidification command
Z : Relay
Contact: Minimum applicable load DC12V 1mA
Contact rating DC12V 0.1A and over
31
3 4 5
3 4 5
Remote controller board
Relay power supply
SW