Table 4-6 Controller Alarm Indications - Carrier 69NT40-561-019 Operation And Service Manual

CODE # CAUSE
Superheat has re-
mained below 1.66C
(3F) degrees for five
minutes continuously
while compressor run-
AL03
ning. Compressor
Loss of
drawing more than 2.0
Superheat
amps, compressor
Control
pressure ratio is great-
er than 1.8, and Elec-
tronic Expansion
Valve (EEV) is at 0%
open.
AL05 Controller has detect-
Manual ed continuous Manual
Defrost Defrost Switch activity
Switch for five minutes or
Failure more.
AL06 Controller has detect-
Keypad or ed one of the keypad
Keypad keys is continuously
Harness Fail activity.
AL07
Fresh Air The VPS is reading
Vent Open greater than 0 CMH
with while unit is in frozen
Frozen Set mode.
Point
Controller detects dis-
charge pressure to
AL08
suction pressure ratio
High
is too high.
Compressor
The controller will at-
Pressure Ra-
tempt to correct the sit-
tio
uation by restarting
the compressor.
Alarm 10 is triggered
when the CO
AL10
voltage is operating
CO Sensor
2
outside of the 0.9 v to
Failure
4.7 v range, or if the
sensor is out of range.
Table 4–6 Controller Alarm Indications
COMPONENTS
Electronic Expan-
sion Valve (EEV)
Evaporator Tem-
perature Sen-
sor(s) ETS &
ETS1.
Evaporator Fans
Keypad
Keypad or
Harness
Vent Position Sen-
sor (VPS)
Discharge
Pressure
Transducer (DPT)
sensor This is a display
2
alarm and has no
associated failure
action.
TROUBLESHOOTING
Check the operation of
the EEV using Cd41.
Verify accuracy of tem-
perature sensors, refer to
Sensor Checkout Proce-
dure Section 7.19.1.
Confirm fans
operating properly.
Power cycle the unit.
Power cycle the unit.
Manually reposition vent
and confirm using Cd45.
Refer to VENT POSI-
TION SENSOR SER-
VICE Section.
Confirm accurate DPT
pressure readings, refer
to MANIFOLD GAUGE
SET Section 7.2.
Refer to eAutoFresh
manual.
4–31
CORRECTIVE ACTIONS
Replace EEV if
defective.
Replace ETS or ETS1
if defective.
Replace fan(s) if defective,
refer to
EVAPORATOR FAN MO-
TOR ASSEMBLY Section
7.10.
Resetting the unit may cor-
rect problem, monitor the
unit.
If the alarm reappears af-
ter 5 minutes replace the
keypad.
Resetting the unit may cor-
rect problem, monitor the
unit.
If the alarm reappears re-
place the keypad and har-
ness.
If unable to obtain zero
reading, replace defective
VPS.
Replace DPT if defective.
The alarm is triggered off
when voltage is within op-
erating range.
T-359