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XP25
Outdoor Control Operation, Checkout and Status / Error Codes
OPERATION:
The outdoor control is a microprocessor-based device for use with variable-capacity compressors up to 5-tons in capacity
operating on 24VAC residential power. The outdoor control integrates the functionality of maintaining compressor speed,
demand, defrost and fan PWM controls. The outdoor control is self-configuring. During start-up the outdoor control selects
one of two configurations variable-capacity air conditioner or variable-capacity heat pump
.
PUSH
BUTTON
7-SEGMENT
DISPLAY
PUMP DOWN - WHEN UNIT IS IN PUMP DOWN MODE,
WILL BE
DISPLAYED ON 7-SEGMENT.
TO ACTIVATE PUMP DOWN MODE, REFER TO PUMP DOWN
CYCLE SEQUENCE ON PAGE 39.
AMBIENT, COIL AND LIQUID
LINE SENSOR PLUG
COMMUNICATION PLUG BETWEEN OUTDOOR
CONTROL AND INVERTER CONTROL
NOTE - THE GREEN LED ON THE OUTDOOR CONTROL FLASHES
WHEN COMMUNICATION OCCURS BETWEEN THE OUTDOOR
CONTROL AND EITHER THE THERMOSTAT OR THE INVERTER.
Figure 57. Outdoor Control Operation
STATUS CODES:
Table 16. Outdoor Control 7-Segment Display Alert Codes - Outdoor Control Status
NOTE - System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidification).
Only the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes are active, then system status codes are displayed. Alert
codes are also displayed on the iComfort Wi-Fi
®
thermostat.
Alert
Codes
Priority
Alarm Description
Possible Causes and Clearing Alarm
E 600
Critical
Compressor has been cycled OFF
on utility load shedding.
Load shedding function: Provides a method for a local utility company to limit the maxim
um power level usage of the outdoor unit.
E 601
Critical
Outdoor unit has been cycled OFF
on low temperature protection.
Low temperature protection: Outdoor unit will not operate when the outdoor temperat
ure is at or below 4°F (20°C). If the unit is operating and the outdoor temperature
drops below 4°F (20°C), the unit continues to operate until the room thermostat is sat
isfied or the outdoor temperature drops to 15°F (26°C). Outdoor unit ambient sensor
provides temperature readings.
