York Heat Pump: YHJF60
Re: Low Heat / Low Cool
The 5 Ton model of the YHJF heat pump uses a 2-stage scroll compressor and a Yorkguard VI control module.
It should also be matched with a Variable Speed air handler.
Since the 5 Ton model is the only unit in this series that uses a 2-stage compressor, it is very common to see one of the following issues:
1. Wrong or Mis-Wired Thermostat
The YHJF60 requires a thermostat that is capable of controlling, and is configured for, a 3-Stage Heat / 2-Stage Cool Heat Pump. R, Y1, Y2, O, G, Aux, C
As of 4/20/17 the three thermostats we have that are capable of controlling this unit are:
2. Mis-Wired Low Voltage
If Y2 is not hooked-up at the Yorkguard module, the compressor will never operate at full capacity.
The following low-voltage wiring should be followed:
Thermostat | Air Handler | Heat Pump |
R | R | R |
C | C | C |
G | G | |
O | O | O |
Y1 | Y1 | Y1 |
Y2 | Wire Nut | Y2 |
Aux | Wire Nut | W |
W1 | W1 Out | |
W2 | W2 Out |