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System Testing & Troubleshooting
DIAGNOSTIC DISPLAYED REASON FOR DIAGNOSTIC UCM’S REACTION RESET REQUIRED
IBTS Adjusted to Maintain Min Diff
Problem: The active Ice Build
Terminate Setpoint (IBTS) is
closer to the Leaving Solution
Cutout Temp Setpoint than the
calculated Minimum Differential.
The active Ice Build Terminate Setpoint
and the Leaving Solution Cutout Temp
Setpoint are too close together for proper
unit operation.
The active Ice Build Terminate
Setpoint is set to the Leaving
Solution Cutout Temp Setpoint
plus the larger of 1) calculated
Minimum Differential value, or
2) 6.5 deg F.
(PAR) An automatic reset occurs after
the difference between the active Ice
Build Terminate Setpoint and the
Leaving Solution Cutout Temp Setpoint
meets the minimum difference
requirement.
Ice Build Terminate Setpoint Fail
Problem: The Ice Build Terminate
Setpoint is out of range.
Check: If Ice Build Terminate
Setpoint Source is assigned to
either GBAS module, but this
setpoint has not been assigned to
one of that GBAS module’s analog
inputs, this diagnostic can occur.
The unit is reading a signal that is out of
range for the Ice Build Terminate
Setpoint.
The default (HI) Ice Build
Terminate Setpoint will become
the active setpoint while this
diagnostic is active.
(PAR) An automatic reset occurs after
the designated Ice Build Terminate
Setpoint source sends a signal that is
within range for 10 continuous seconds,
or after a different setpoint source is
user-defined.
Leaving Solution Setpoint Fail
Problem: The designated Leaving
Solution Setpoint is out of range.
If either GBAS module is
designated as the Leaving Solution
Setpoint source, verify that GBAS
module has this input assigned to
one of it’s analog inputs.
The designated Leaving Solution Setpoint
source is out of range. Out of range is
defined as one of the following:
a) LSS > 65 deg F or < 51 deg F for unit
with LSS Range 51-65 deg F.
b) LSS > 50 deg F or < 40 deg F for unit
with LSS Range 40-50 deg F.
c) LSS > 39 deg F or < 30 deg F for unit
with LSS Range 30-39 deg F.
d) LSS > 29 deg F or < 20 deg F for unit
with LSS Range 20-29 deg F.
e) LSS > 75 deg F or < 10 deg F for unit
with LSS Ran
e SPECIAL.
While the diagnostic is active,
the Leaving Solution Setpoint
will revert to using the default
(HI) Leaving Solution Setpoint.
(PAR) An automatic reset occurs after
the designated Leaving Solution
Setpoint returns to its allowable range.
In order to prevent rapid cycling of the
Diagnostic, there is a 10 second delay
before the automatic reset.
Liquid Pressure Sensor Fail
Circuit 1
Problem: Circuit 1 Saturated Liquid
Line Pressure sensor input is out
of range.
Check: Check field/unit wiring
between Sensor and SSM.
The unit is reading a signal that is out of
range for the Circuit 1 Saturated Liquid
Line Pressure Sensor input on the SSM.
(Pressure < 0 PSIG or Pressure > 400
PSIG).
The Superheat/Subcool
calculation is invalid and the
vaiues are set to zero. No
other change in unit operation
occurs. This diagnostic is for
information only.
(INFO) An automatic reset occurs after
the Circuit 1 Saturated Liquid Pressure
Sensor input returns to its allowable
range. In order to prevent rapid cycling
of the Diagnostic, there is a 10 second
delay before the automatic reset.
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