McQuay MWM Service Manual page 36

MCQUAY Service Guide Book
W2 Heatpump with Auxiliary heater
To convert SB125 heatpump PCB to auxiliary
heater application, the following components
need to be added onto the PCB:
Step 1:-
Place the shunt jumper at jumper header M2.
M2
Step 2:-
1. Place the JM relay at RY_HTR location
2. Solder all the relay pins
RY_HTR
1. Shunt jumper
2. JM Relay 240VAC/ 20A
W2 Heatpump with Auxiliary Heater
35
Controller Configuration