3-3 T -312
Table 3-3. Driver Display Panel Alarm Message Definition - Continued
ALARM
NO.
TITLE CAUSE REMEDY MICROPROCESSOR RESPONSE
A22 Condenser
Fan Overload
(continued)
Condenser fan over-
loads
Refertosection3.3.3
and/or 3.3.4
If after energizing the second con-
denser fan, the second condenser fan
overload does not open, the micro-
processor will keep the first over-
load alarm activated and leave the
compressor and second condenser
fan energized. (The second condens-
er fan remains energized since at
least one condenser fan must be en-
ergized when the compressor is en-
ergized.)
A23 High Pressure
Discharge
High discharge
pressure.
Check discharge
pressure transducer
voltage, wiring or
cause of high dis-
charge pressure. (Re-
fertosection4.15and
Table 4-5 and/or sec-
tion 3.3.3.)
If this alarm has not been activated
three times in 30-minutes, it de-en-
ergizes the clutch for the minimum
off time and until the alarm is de-ac-
tivated. Energizes the second con-
denser fan at high speed. De-ener-
gizes the rest of the system unless
heat is required.
If this alarm has been re-activated
three times in 30-minutes, it de-en-
ergizes the rest of the system. The
system will operate only in the heat
mode until the alarm is reset via
communications.
A25 Out of Range If the system is con-
trolling within 9
_F
(5_C) of setpoint for a
period of 15 minutes
and then fails to con-
trol within 18_F
(10_C) for any reason
this alarm will be acti-
vated.
Refertosection3.3.1,
3.3.2 and/or 3.3.8 de-
pending on heating/
cooling requirements.
No microprocessor response other
than alarm.
A26 Low Voltage/
Load Shed
Low coach voltage.
Coach 12 vdc battery
supply voltage
dropped below 12.6
vdc for 30 seconds.
Check/repair alterna-
tor or coach power
supply.
De-energizes all outputs except driv-
er evaporator fan motor. (See section
2.1.2.)
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