Page 20
Diagnostic Features
The Status LED on the CXM control advises the service-
man of the current status of the CXM control. The status
LED can display either the current CXM mode or the last
fault memory if in test mode. See Table 1 for a complete
listing of codes.
Unit Operation Description
PowerUp
-
The unit will not operate until all the inputs
and safety controls are checked for normal conditions.
NOTE: The compressor will have a 5 minute anti-short -
cycle delay at power-up.
Standby
-
In Standby mode, Y and W inputs are not
active. Inputs O and G may be active. Compressor will
be off.
Cooling
-
To enter Cooling mode, Y and O become
active. The first time after power-up that there is a call
for compressor, the compressor will follow a 5 to 80
second random start delay. There will also be a 5 min
compressor anti-short cycle protection time as well.
After the random start delay, the compressor relay is
energized. On all subsequent compressor calls, the
random start delay is omitted.
Heating Stage 1
-
To enter Heating Stage 1 mode, Y
becomes active. The first time after power-up that there
is a call for compressor, the compressor will follow a 5 to
80 second random start delay. There will also be a 5 min
compressor anti-short cycle protection time as well. After
the random start delay, the compressor relay is energized.
On all subsequent compressor calls, the random start
delay is omitted.
Heating Stage 2
-
To enter Heating Stage 2 mode, W
becomes active (Y already active). The Compressor relay
remains on. EH1 is turned on immediately. With
continuing Heating Stage 2 demand, EH2 will turn on
after 10 minutes. The EH2 will not turn on in heating (or
will turn off if already on) if loop temperature is above
approximately 50
°
F (FP1 >45
°
F).
Emergency Heat
-
In Emergency Heat mode, W be-
comes active while Y is not active. EH1 is turned on
immediately. With continuing Emergency Heat demand,
EH2 will turn on after 5 minutes. The FP1 and FP2
temperatures do not effect emergency heat operation.
excluding LED and Alarm Relay, will NOT be affected
by UPS. The UPS condition cannot occur during a
compressor off cycle. During UPS warning, the alarm
relay will cycle on and off. The cycle rate will be On for
5 seconds, Off for 25 seconds, On for 5 seconds, Off for
25 seconds, etc.
Unit Performance Sentinel Warning Code = 8
Table 9. Fault Description Table
F a u l t
Fault LED
C o d e
Fault Condition
No Fault In Memory
1
There has been no fault detected since the last
power down/power up sequence
High Pressure Switch
2
HP Open Instantly
Low Pressure Switch or LOC
3
LP open for 30 continuous seconds before or
during a call (bypassed for first 60 seconds)
Freeze Protection Coax - FP1
4
FP1 below Temp limit for 30 continous seconds
(bypassed for first 60 seconds of operation)
Freeze Protection Air Coil - FP2
5
FP2 below Temp limit for 30 continous seconds
(bypassed for first 60 seconds of operation)
Condensate overflow
6
Sense overflow (grounded) for 30 continous
seconds
Over/Under Voltage Shutdown
7 (Autoreset)
"R" power supply is <19VAC or >30VAC
UPS Warning
8
Unit Performance Warning signal has occurred
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