MAINTENANCE
11.
Air leaks may make the conditioned area
uncomfortably drafty or produce noises. Visually
inspect foam gasket between wall and unit, taking
note of separation between air inlet for condenser
and condenser coil discharge. These two areas must
be sealed off from each other. If you experience poor
cooling operation or erratic operation, check for air
recirculation at condenser coil.
12.
Replace access panels and reconnect electrical power.
Heat Pump Units — Temporary Emergency
Heating Mode
Heat pump failure, control board can be forced into electric
heat mode.
This is temporary solution until heat pump system
can be repaired.
1.
Locate circuit board in control section of the unit.
2.
Locate terminals where outdoor sensor connects to the
circuit board.
3.
Using small needle nose type pliers, disconnect one
side of sensor from circuit board. A 2-stage thermostat
will provide Emergency heat.
4.
This will appear to circuit board as outdoor coil freeze
condition energizing the electric resistance heater on
call for heat.
5.
See "Manual Reset Limit Switch" for resetting limit
switch if needed. See figure 33 page 35.
Troubleshooting Sensors
1.
See figure 34 for location of sensor connections to the
control board.
2.
If temperature response of indoor or outdoor sensor
is not correct, disconnect sensor from control board
and verify sensor resistance. Replace sensor if its
resistance is not close to values in the table below.
Table 2 - Sensor Resistance Values
@ Ambient
Temperature
Resistance
77 (25°C)
10.0 K
50 (10°C)
19.9 K
35 (1.6°C)
30.0 K
30 (-1.1°C)
34.4 K
Figure 34
- Control Board Sensor Connections
Indoor Sensor Connections
Outdoor Sensor Connections
The Right Fit for Comfort
36
P/N 240010545, Rev. B [10/24/2014
]
