Trane S*HF*20-75 Troubleshooting Manual page 134

DIAGNOSTICS Menu
Table 11: Diagnostics Troubleshooting Chart (continued)
RTM Space Humidity
Sensor Failure
Used With: Dehumidificat
ion or Humidification
option.
Module: RTM
RTM Zone Temperature
Sensor Failure
Module: RTM
RA Humidity Sensor
Failure
Used With: Dehumidificat
ion or Humidification
option, or Comparative
Enthalpy installed.
Module: ECEM
Rapid Restart HW
Configuration Failure
Used With: Rapid Restart.
Module: RTM
134
Problem: The RTM space
humidity sensor data is out
of range (Humidity < 1% or
Humidity > 100%).
Check: Check field/unit
wiring between RTM and
the sensor.
Problem: The RTM Zone
Temperature Sensor has
been assigned to at least
one function, and this
sensor signal is out of range
(Temp < -55 F or Temp >
209 F).
Check: The HI value and
wiring between the RTM
module and the sensor.
Removing the plug from the
RTM module there should
be no shorts, opens and
sensor resistance should be
between 830 ohms and
345.7Kohms.
Problem: The return air
humidity sensor data is out
of range (Humidity < 10%
or Humidity > 90%).
Check: Check field/unit
wiring between ECEM and
the sensor.
Problem: The
GBAS(5VDC) hardware
configuration module or
input has failed, or has
been changed since the last
power cycle.
Check: The wire harness,
the GBAS(5VDC) config
module input. Refer to the
Human Interface
GBAS(5VDC) status screen
for proper index value.
The dehumidification and
humidification functions
are disabled if the RTM
Space Humidity Sensor is
selected as sensor source
for these functions.
The functions with the RTM
Zone Temperature Sensor
input designated as their
sensor are disabled.
The Economizer Enable r.e.
Enthalpy function reverts
to Reference Enthalpy
changeover ("Level 2")
control.
The unit will not honor the
Rapid Restart start
sequence. Normal unit
start times and DX
interstage will be honored.
(PAR) An automatic reset
occurs after the RTM Space
Humidity Sensor input
returns to within range
continuously for 10
seconds.
(PAR) An automatic reset
occurs after the designated
temperature signal returns
to its allowable range. In
order to prevent rapid
cycling of the diagnostic,
there is a 10 second delay
before the automatic reset.
(PMR) An automatic reset
occurs after the RA
Humidity input returns to
its allowable range
continuously for 10
seconds.
(PAR) An automatic reset
occurs after the user has
accessed and followed the
instructions on the Human
Interface Rapid Restart
configuration menu. Press
+ or - key then press the
ENTER key to reset the
configuration. Power down
the unit, troubleshoot then
power up the unit and
return to this screen for
verification.
RT-SVP07B-EN