Trane SCXG-SVX01B-EN manual Maintenance diagnostics, Diagnostics

Maintenance diagnostics

Diagnostics

Refer to the IntelliPak Self-Contained Programming Guide, PKG-SVP01B-EN, for specific unit programming and troubleshooting information. In particular, reference the “Service Mode Menu” and “Diagnostic Menu”sections in the programming guide. Refer to the following text for general diagnostic and troubleshooting procedures. Common diagnostics and troubleshooting procedures follow below.

A

Auto Reset S/A Static Pressure Limit Problem: The supply air static pressure went too high.

Reason for Diagnostic: The S/A static pressure exceeded the S/A static pressure limit setpoint for at least one second continuously.

UCM Reaction: A "supply air pressure shutdown" signal is sent to the following functions:

a. Compressor staging control, b. Economizer actuator control, c. Heat operation,

d. Supply fan control, e. IGV/VFD control, f. Exhaust fan control,

g. Exhaust actuator control

Reset Required: (PAR) An automatic reset occurs after the IGV close. The supply fan is not allowed to restart for 15 seconds after the diagnostic occurs. An auto reset will also occur if the unit cycles out of occupied mode and back.

C

CO2 Sensor Failure

Problem: The VCM CO2 sensor input signal is out of range.

Check: Check field/unit wiring between sensor and VCM.

Reason for Diagnostic: The unit is reading a signal that is out of range for the CO2 sensor transducer input.

UCM Reaction: The CO2 reset function disables.

Reset Required: (PAR) An automatic reset occurs after the CO2 sensor transducer input receives a signal that is within range for ten continuous seconds.

Compressor Contactor Fail - Circuit 1, 2, 3, or 4

Problem: The compressor contactor for Ckt. 1, 2, 3, or 4 has malfunctioned.

Reason for Diagnostic: The circuit compressor proving input is detected closed continuously for more than three seconds while neither compressor output on that circuit closes.

UCM 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 the disgnostic is set. It can be reset by the HI orTracer Summit.

CompressorTrip - Ckt 1, 2, 3, or 4 Problem: The compressor ckt #1, 2, 3, or 4 has tripped.

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).

Reason for Diagnostic: 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).

UCM’ 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 orTracer Summit.

CondenserTemp 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).

UCM 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.

UCM 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.

UCM Reaction: If the unit has the comparative enthalpy option, the economizer enable r.e. enthalpy function will revert to level 2 enthalpy comparison.

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