Trane Technologies IntelliPak Signature SCWF - Condenser, Filter, and Communication Diagnostics

SCXF-SVX01T-EN
93
Category Diagnostic
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.
Controls
Reaction
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
• Exhaust fan control and proof of operation.
• Exhaust actuator control
• Outside air damper control
• On VAV units, VFD control
Reset
Required
(PMR) A manual reset is required after the emergency stop input recloses. The diagnostic can be reset by the HI.
Entering Condenser Water Temperature Sensor Fail
Activation
Conditions
Temperature < -50°F or temperature > 209°F, and unit configured for water-cooled condenser
Diagnostics