3-16T -320
Table 3-6 Controller Alarm Indications
(Sheet 1 of 4)
Code
No.
TITLE DESCRIPTION
AL14
Phase Sequence
Failure -- Electronic
Alarm 14 is triggered if the electronic phase detection system is unable to deter-
mine the correct phase relationship. DIRCHECK will be displayed while the rela-
tionship is determined. If the system is unable to determine the proper relation-
ship alarm 14 will remain active. Additional information on phase detection may
be displayed at Function Code Cd41. If the right most digit of Code Cd41 is 3 or
4, this indicates incorrect motor or sensor wiring. If the right most digit is 5, this
indicates a failed current sensor assembly.
AL15 Loss of Cool
Alarm 15 is activated when SMV is greater than 15%, unit is in economized or
standard operating modes and Return -- Supply Temperature Difference is less
than 0.5C after 4 minutes of compressor run time. The alarm triggers failure ac-
tion C ( evaporator fan only) or D ( all machinery off ) if in perishable mode and
failure action D ( all machinery off ) if a frozen set point has been selected.. The
alarm remains active until the unit is power cycled.
AL16
Compressor Current
High
Alarm 16 is triggered if compressor current draw is 15% over calculated maxi-
mum for 10 minutes out of the last hour. The alarm is display only and will trigger
off when the compressor operates for one hour without over current.
AL17
Phase Sequence
Failure -- Pressure
Alarm 17 is triggered if a compressor start in both directions fails to generate suf-
ficient pressure differential. The controller will attempt restart every twenty min-
utes and deactivate the alarm if successful. This alarm triggers failure action C
(evaporator fan only) or D (all machinery off) of Function Code Cd29 if the unit
has a perishable set point. Failure action D (all machinery off) is triggered if the
unit has a frozen set point
AL18
Discharge Pressure
High
Alarm 18 is triggered if discharge pressure is 10% over calculated maximum for
10 minutes within the last hour. The alarm is display only and will trigger off when
the compressor operates for one hour without overpressure.
AL19
Discharge Tempera-
ture High
Alarm 19 is triggered if discharge temperature exceeds 135_C (275_F) for 10
minutes within the last hour. The alarm is display only and will trigger off when
the compressor operates for one hour without over temperature.
AL20
Control Circuit Fuse
Open (24 vac)
Alarm 20 is triggered by control power fuse (F3A, F3B) opening and will cause
the software shutdown of all control units. This alarm will remain active until the
fuse is replaced.
AL21
Micro Circuit Fuse
Open (18 vac)
Alarm 21 is triggered by one of the fuses (F1/F2) being opened on 18 volts AC
power supply to the Controller. The suction modulation valve (SMV) will be
opened and current limiting is halted. Temperature control will be maintained by
cycling the compressor.
AL22
Evaporator Fan Mo-
tor Safety
Alarm 22 responds to the evaporator motor internal protectors. The alarm is trig-
gered by opening of either internal protector. It will disable all control units until
the motor protector resets and the unit is power cycled.
AL23 Loss of Phase B
Alarm 23 is triggered if low current draw is detected on phase B and IPCP, HPS
or IPEM is not tripped. If the compressor should be running, the controller will
initiate a start up every five minutes and trigger off, if current reappears. If the
evaporator fan motors only should be running, the alarm will trigger off is current
reappears. This alarm triggers failure action C (evaporator fan only) or D (all ma-
chinery off) of Function Code Cd29 if the unit has a perishable set point. Failure
action D (all machinery off) is triggered if the unit has a frozen set point
AL24
Compressor Motor
Safety
Alarm 24 is triggered when compressor is not drawing any current. It also triggers
failure action ”C” or ”D” set by function Code 29 for perishable setpoint, or ”D” for
frozen setpoint. If the compressor should be running, the controller will initiate a
start up every five minutes and trigger off, if current reappears. This alarm will
remain active until compressor draws current.
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