Trane Voyager Commercial Installation, Operation And Maintenance Manual page 130

D D i i a a g g n n o o s s t t i i c c s s
depending on the type of meter used. Some meters
may only pulse between 20 and 30 volts DC.
3. Refer to the data in "What Outputs Mean" section
to determine course of action.
What Outputs Mean:
HEAT J6-7
• On = system is actively heating
• Off = system is not actively heating
• Pulsing = a diagnostic is present (see
DIAGNOSTICS section).
COOL J6-8
• On = system is actively cooling
• Off = system is not actively cooling
• Pulsing = a diagnostic is present (see
DIAGNOSTICS section).
SYSTEM J6-9
• On = RTRM has power
• Off = RTRM does not have power or has failed
• Pulsing = unit is in the TEST mode
SERVICE J6-10
• On = dirty air filter indication
• Off = normal operation
• Pulsing = a diagnostic is present (see
DIAGNOSTICS section).
N N o o t t e e : : Diagnostics for CV/SZ VAV or VAV units are
listed separately. The same diagnostic may
have a different meaning depending on
whether the unit has VAV controls or CV/SZ
VAV controls.
Diagnostics (CV and SZ VAV 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)
• TCO1, TCO2 or TCO3 has opened.
• IGN Module lockout (see gas heat section for
troubleshooting).
• Supply Air Temperature has Failed (SZ VAV Only
with Modulating Heat).
COOL
• Zone temp input (RTRM J6-1) is open, shorted, or
has failed after the RTRM sensed a valid input.
130
N N o o t t e e : : Since CV units may use a conventional
thermostat, the RTRM will not send a
diagnostic if 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.
All units configured for SZ VAV will blink the
Cool indicator if there is a Zone Temp. input
failure because a valid Zone Temperature
reading is required for all SZ VAV operation.
• Cooling and heating setpoint inputs are both open,
shorted, or failed, but the unit has a valid zone temp
input.
• Programmable ZSM (BAYSENS119*) has failed to
communicate after successful communication has
occurred.
• CC1 or CC2 24 VAC control circuit has opened 3
times during a cooling mode. Check CC1, CC2 coils
or any controls in series with the coils (winding
thermostat, HPC, circuit breaker auxiliary contacts).
• LPC 1 or LPC 2 has opened during the 3 minute
minimum "on" time during 4 consecutive
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.
• Discharge air sensor (DTS) input is open, shorted,
or has failed.
SERVICE
The supply fan proving switch (FFS) has failed to close
within 40 seconds after the fan starts or has closed
during fan operation.
HEAT + COOL
• The Emergency Stop input (LTB1-5 and LTB1-6) is
open. Check this input at the RTRM by measuring
voltage from RTRM J1-12 to chassis ground. 24
VAC should be present whenever the Emergency
Stop input is closed.
• Outdoor air sensor (OAS) input is open, shorted, or
has failed.
HEAT + COOL + SERVICE
• Smoke Detector input active.
• Supply Air Temperature Failure on units with
modulating hot gas reheat
• Entering Evaporator Temperature Failure on units
with modulating hot gas reheat.
• RTDM Communication Failure on units with
modulating hot gas reheat.
RT-SVX34R-EN