SCXF-SVX01Q-EN
103
Category Diagnostic
Reason for
Diagnostic
• The ckt #1, 2, 3, or 4 compressor proving input is detected open continuously for more than 3 seconds when either or both
compressor outputs on that circuit energize (as described in the compressor protection function).
• The circuit compressor proving input is detected open continuously for more than 3 seconds when either or both
compressor outputs on that circuit energize (as described in the compressor protection function).
Controls
Reaction
A “lockout ckt #1, 2, 3, or 4” request is issued to the compressor staging control function.
Reset
Required
(PMR) A manual reset is required after this diagnostic occurs. The diagnostic can be reset by the unit mounted HI module or
Tracer Summit.
Condenser Temp Sensor Failure—Circuit 1, 2, 3, or 4
Problem
The saturated condenser temperature input is out of range for circuit #1, 2, 3, or 4.
Check
Sensor resistance should be between 830 ohms (200°F) and 345.7 ohms (-40°F). If so, check field/unit wiring between sensor
and MCM/SCM.
Reason for
Diagnostic
The unit is reading a signal that is out of range for the circuit #1, 2, 3, or 4 saturated condenser temperature sensor. (temp <
-55°F or temp > 209°F).
Controls
Reaction
A “Lockout Ckt # 1, 2, 3, or 4” request is issued to the compressor staging control function.
Reset
Required
(PAR) An automatic reset occurs after the circuit 1, 2, 3, or 4 condenser temp input returns to its allowable range within 10
seconds.
D
Dirty Filter
Problem
There is a dirty filter.
Reason for
Diagnostic
The filter switch input on the RTM is closed for more than 60 seconds continuously.
Controls
Reaction
An information only diagnostic is set.
Reset
Required
(INFO) An automatic reset occurs after the dirty filter input reopens for 60 continuous seconds.
E
ECEM Communications Failure
Problem The RTM has lost communication with the ECEM.
Check
Field/unit wiring between RTM and ECEM module.
Reason for
Diagnostic
The RTM has lost communication with the ECEM.
Controls
Reaction
If the unit has the comparative enthalpy option, the economizer enable r.e. enthalpy function will revert to level 2 enthalpy
comparison.
Reset
Required
(PAR) An automatic reset occurs after communication has been restored.
Emergency Stop
Problem
The emergency top input is open.
Reason for
Diagnostic
An open circuit has occurred on the emergency stop input caused either by a high duct temp t-stat trip, or the opening of field-
provided contacts, switch, etc.
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