Diagnostics (Cv Units Only) - Trane Voyager Commercial Installation & Operation Manual

Diagnostics
(see DIAGNOSTICS section).
Note: Diagnostics for CV or VAV units are listed separately. The same diagnostic may have a

Diagnostics (CV units only)

If only one diagnostic is present, refer to that diagnostic listing below. If more than one diagnostic
is present, refer to combination diagnostics such as COOL + HEAT as appropriate. On a
BAYSENS119*, the display will show HEAT FAIL or COOL FAIL or SERVICE (or an appropriate
combination) if a diagnostic is present. If the unit is using a conventional thermostat, diagnostics
are still available by using a DC voltmeter as described above.
HEAT (YC only)
1. TCO1, TCO2 or TCO3 has opened.
2. IGN Module lockout (see gas heat section for troubleshooting).
COOL
1. Zone temp input (RTRM J6-1) is open, shorted, or has failed after the RTRM sensed a valid input.
Note: Since CV units may use a conventional thermostat, the RTRM will not send a diagnostic if
2. Cooling and heating setpoint inputs are both open, shorted, or failed, but the unit has a valid
3. Programmable ZSM (BAYSENS119*) has failed to communicate after successful
4. CC1 or CC2 24 VAC control circuit has opened 3 times during a cooling mode. Check CC1, CC2
5. LPC 1 or LPC 2 has opened during the 3 minute minimum "on" time during 4 consecutive
SERVICE
1. The supply fan proving switch (FFS) has failed to close within 40 seconds after the fan starts or
HEAT + COOL
1. The Emergency Stop input (LTB1-5 and LTB1-6) is open. Check this input at the RTRM by
2. Outdoor air sensor (OAS) input is open, shorted, or has failed.
HEAT + COOL + SERVICE
1. Smoke Detector input active.
2. Supply Air Temperature Failure on units with modulating dehumidification
3. Entering Evaporator Temperature Failure on units with modulating dehumidification.
4. RTDM Communication Failure on units with modulating dehumidification.
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different meaning depending on whether the unit has VAV controls or CV controls.
(See note)
a zone sensor is not attached when power is applied to the unit. Also, the RTRM ignores a
zone sensor if it is attached to a powered-up unit. (after a brief time-out). Therefore, always
reset power after installing a mechanical ZSM to terminals RTRM J6-1 through J6-5.
zone temp input.
communication has occurred.
coils or any controls in series with the coils (winding thermostat, HPC, circuit breaker auxiliary
contacts).
compressor starts. Check LPC 1 circuit by measuring voltage from RTRM J1-8 to chassis
ground. Check LPC 2 circuit by measuring voltage from RTRM J3-2 to chassis ground. If 24 VAC
is not present, the circuit is open. 24 VAC should be present at these terminals at all times.
has closed during fan operation.
measuring voltage from RTRM J1-12 to chassis ground. 24 VAC should be present whenever
the Emergency Stop input is closed.
RT-SVX34C-EN