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Category
Diagnostic
Condenser Temp Sensor Failure—Circuit 1, 2, 3, or 4
The saturated condenser temperature input is out of range for circuit #1, 2, 3, or 4.
Problem
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.
Check
Reason for
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 >
Diagnostic
209°F).
Controls
A "Lockout Ckt # 1, 2, 3, or 4" request is issued to the compressor staging control function.
Reaction
Reset
(PAR) An automatic reset occurs after the circuit 1, 2, 3, or 4 condenser temp input returns to its allowable range within 10 seconds.
Required
D
Dirty Filter
There is a dirty filter.
Problem
Reason for
The filter switch input on the RTM is closed for more than 60 seconds continuously.
Diagnostic
Controls
An information only diagnostic is set.
Reaction
Reset
(INFO) An automatic reset occurs after the dirty filter input reopens for 60 continuous seconds.
Required
E
ECEM Communications Failure
Problem
The RTM has lost communication with the ECEM.
Field/unit wiring between RTM and ECEM module.
Check
Reason for
The RTM has lost communication with the ECEM.
Diagnostic
Controls
If the unit has the comparative enthalpy option, the economizer enable r.e. enthalpy function will revert to level 2 enthalpy comparison.
Reaction
Reset
(PAR) An automatic reset occurs after communication has been restored.
Required
Emergency Stop
The emergency top input is open.
Problem
Reason for
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
Diagnostic
contacts, switch, etc.
Off or close requests are issued as appropriate to the following functions;
•
Compressor staging/chilled water cooling control
•
Heat operation
•
Supply fan control and proof of operation
Controls
Reaction
•
Exhaust fan control and proof of operation.
•
Exhaust actuator control
•
Outside air damper control
•
On VAV units, VFD control
Reset
(PMR) A manual reset is required after the emergency stop input recloses. The diagnostic can be reset by the HI.
Required
Entering Condenser Water Temperature Sensor Fail
Activation
Temperature < -50°F or temperature > 209°F, and unit configured for water-cooled condenser
Conditions
SCXF-SVX01T-EN
Diagnostics
93
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