55
XC25
Table 11 continued
Alert
Codes
Inverter
Code
Inverter LED Flash
Code (number of
flashes)
Priority
Alarm Description
Possible Causes and Clearing Alarm
Red LED
Green LED
E 440
13
1 flash
3 flashes
Moderate
Compressor slow
down due to high
heatsink temperat
ure.
Heat sink temperature is approaching limit. The compressor
speed automatically slows to reduce heatsink temperature. The
control sets indoor CFM and outdoor RPM to values according to
demand percentage rather than the actual Hz. Alarm is automat
ically cleared.
E 441
14
1 flash
4 flashes
Moderate
Compressor slow
down due to high
compressor current.
Compressor current is approaching high limit. The compressor
speed automatically slows. The control will set indoor CFM and
outdoor RPM to values according to demand percentage rather
than the actual Hz. Alarm is automatically cleared.
E 600
N/A
N/A
N/A
Critical
Compressor has
been cycled OFF on
utility load shedding.
Load shedding function: Provides a method for a local utility
company to limit the maximum power level usage of the outdoor
unit. The feature is activated by applying 24 volts AC power to
the L and C terminals on the outdoor control.
Crankcase Heater, Checkout and Status / Error Codes
OPERATION:
CRANKCASE HEATER (HR1)
Compressors in all units are equipped with a 40 or 70 watt (depending on unit size) belly-band type crankcase heater. The
heater prevents liquid from accumulating in the compressor. The heater is controlled by the crankcase heater thermostat.
CRANKCASE HEATER THERMOSTAT (S40)
Crankcase heater thermostat S40 controls the crankcase heater in all units and is located on the liquid line (see figure 2 for
location).
1. When liquid line temperature drops below 50°F the thermostat closes which results in the heater being energized.
2. When liquid line temperature rises above 70°F the thermostat opens which results in the heater being de-energized.
Belly-Band Crankcase Heater - 240VAC, Watts
40 or 70
Crankcase Heater Thermostat
Figure 36. Belly-Band Crankcase Heater Thermostat
CHECKOUT:
Belly-Band Crankcase Heater
:
Using meter set on ohms, check crankcase heater resistance. If resistance is 0 ohms or
infinite, replace the crankcase heater.
