Ingersoll-Rand ReliaTel, Manual, Page: 33 / 176

RT-SVD03L-EN 33
Figure 24. ReliaTel™ refrigeration module (RTRM)
RTRM Diagnostics
N No otte e:: For production, several versions of the RTRM are
used depending on unit functions. There is one
replacement module for all units.
RTRM System LED Diagnostic Indicator
On RTRM version 4.0 or higher, the green system LED
on the RTRM module can provide a quick visual
indication of the presence of certain diagnostics. If the
green LED on the RTRM is blinking with two ¼ second
blinks every two seconds, one or more of the following
diagnostics is present:
• Supply fan fail
• Zone temperature sensor input failure on CV units
• Programmable ZSM communication failure
• Manual compressor lockout (one or both circuits)
• Outdoor coil temp sensor failure (heat pumps only)
• Defrost fault condition (heat pumps only)
• Gas heat failure
• Discharge air temperature failure on modulating
heat and modulating reheat units
• Frostat ™ active
• Outdoor air temperature sensor failure
• Smoke detector active
• Entering evaporator temperature failure (on
modulating reheat units)
• RTOM communication failure
• RTDM communication failure (on modulating
reheat units)
• RTVM communication failure
• Space pressure sensor failure
• Dehumidification mis-configuration
• Reheat circuit entering evaporator temperature
failure
• 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.
N No otte e:: Since constant volume (CV) units 3 to 50 Tons
may use a conventional thermostat, the RTRM
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.
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.
N No otte e:: 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.
SERVICE
SYSTEM
COOL
HEAT
COMMON
RTRM J6
DC
VOLTS
The following charts show what readings to expect, as
well as what the readings mean.
R Re elliia aT Te ell ™ ™ R Re effrriig ge erra attiio on n M Mo od du ulle e ((R RT TR RM M))