Trane ReliaTel Diagnostic Manual page 27

Froststat Active
Outdoor Air Temperature Sensor Failure
Smoke Detector Active
Entering Evaporator Temp. Failure (On Modulating Reheat Units)
RTOM Comm. Failure
RTDM Comm. Failure (On Modulating Reheat Units)
RTVM Comm. Failure
Space Pressure Sensor Failure
Dehumidification Mis-Configuration
Reheat Circuit Entering Evaporator Temperature Failure
27½ to 50 Ton Units:
Zone temperature sensor failure during unoccupied mode and on units with Modulating Reheat
(VAV only)
Static pressure transducer output failure (VAV only)
High duct static pressure trip (VAV only)
Discharge air sensor failure (VAV only)
If the service technician sees the RTRM fault indication, the next step is to check for diagnostics as
indicated on the following pages to help determine which of the above diagnostics is present.
Note: Since Constant Volume (CV) units 3-50 ton may use a conventional thermostat, the RTRM
The RTRM provides certain diagnostic information to the end user or service technician depending
on the type of controls used. Regardless of controls used however, a service technician with a DC
voltmeter can read the diagnostics at the RTRM as shown below.
Note: When a voltmeter is first applied, allow 2-3 seconds for the reading to stabilize.
The actual readings obtained vary depending on the controls used. The following charts show what
readings to expect, as well as what the readings mean.
Table 1.
the following pages.
RT-SVD03G-EN
will not display 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 such as a
BAYSENS006 – 010 to terminals RTRM J6-1 through J6-10.
Approximate voltage readings (depending on control used)
Thermostat or
See "What the mechanical ZSM
readings mean" on without indicators or
with no controls
attached at all
ON
32 VDC ± 10%
OFF
0.75 VDC ± 10%
PULSING
20 to 30 VDC
ReliaTel Refrigeration Module (RTRM)
Programmable
Mechanical ZSM
ZSM with
with indicators
indicators
26 VDC ± 10% 2.0 VDC ± 10%
0.75 VDC ± 10% 0.75 VDC ± 10%
1.5 to 2.5 VDC 14 to 30 VDC
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