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Section 7 - Operation
Unit yearly service required warning
UNIT WARNING
YEARLY SERVICE REQUIRED – CONTACT JCI
Yearly service warning is set when the days since the
last service exceed 365 days and the operating hours
since the last service exceed 2.890 hours. Warnings are
not logged in the history buffer. When the yearly ser-
vice is complete, set the days to zero after clearing the
warning.
Unit 3 year service required warning
UNIT WARNING
3 YEAR SERVICE REQUIRED – CONTACT JCI
3 year service warning is set when the days since the
last service exceed 1,095 days. Warnings are not logged
in the history buffer. When the 3 year service is com-
plete, set the days to zero after clearing the warning
Unit 5 year service required warning
UNIT WARNING
5 YEAR SERVICE REQUIRED – CONTACT JCI
5 year service warning is set when the days since the
last service exceed 1,825 days. Warnings are not logged
in the history buffer. When the 5 year service is com-
plete, set the days to zero after clearing the warning
Unit safeties
Unit safety operation
Unit faults are safeties that cause all running compressors
to be shut down, if a safety threshold is exceeded for 3 s.
Unit faults are recorded in the history buffer along with
all data on the unit and system operating conditions. Unit
faults are auto reset faults where the unit will be allowed
to restart automatically after the fault condition is no lon-
ger present. The only exception is any of the VSD related
unit faults. If any 3 VSD unit faults occur within 90 min,
the unit will be locked out on the last fault. A VSD lock-
out condition requires a manual reset using the system
switches. Both system switches must be cycled OFF and
ON to clear a VSD unit lockout fault. If a unit safety is in
effect, the message will be displayed to the operator when
the STATUS key is pressed.
In the descriptions of the fault displays that follow, the
fault message will show a YYYYYYY to indicate that
a system is in a FAULT condition and will restart when
the fault clears or LOCKOUT" and will not restart until
the operator clears the fault using the keypad.
110
If a control panel safety occurs after the VSD fault,
but before the fault is reset, the control panel fault is
an ALL FAULT of the VSD fault, meaning it is regis-
tered as such in the History because it occurred while
the VSD was shutting down or while the systems were
shut down. All faults do not store operating data at the
time of the fault.
If a VSD fault occurs during the fault rampdown or
while the systems are shut down, the VSD fault will
be registered as a new fault. The reason for this is the
belief any VSD fault be registered with a full account
of the systems data at the time of the fault.
High ambient temp fault
If the ambient temperature rises above 55°C (131°F),
the chiller will shut down with a controlled ramped
shutdown. Restart will automatically occur, if demand
allows, when temperature falls 1.1°C (2°F) below
the cutout of 53.9°C (129°F). This fault cannot cause
a lockout. The fault display message will be present
only during the time when the ambient temperature is
causing a fault condition. The following is a sample
display:
UNIT YYYYYYYY
HIGH AMBIENT TEMP
The unit is also inhibited from starting any time the
temperature is above 53.9°C (129°F).
Low ambient temp fault
If the ambient temperature falls below the program-
mable Low Ambient Temp Cutout the chiller will
shut down with a controlled ramped shutdown. This
fault will only occur if the Low Ambient Cutout is
ENABLED under the OPTIONS key. Restart can oc-
cur, if demand allows, when temperature rises 1.1°C
(2°F) above the cutout. This fault cannot cause a lock-
out. The fault display message will be present only dur-
ing the time when the ambient temperature is causing
a fault condition. The following is a sample display:
UNIT YYYYYYYY
LOW AMBIENT TEMP
The unit is also inhibited from starting any time the
temperature is below the cutout plus 1.1°C (2°F).
Form QTC4-NM2
Issue date: 05/12/2023
Quantech
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