Trane S*HF*20-75 Troubleshooting Manual page 139

Table 11: Diagnostics Troubleshooting Chart (continued)
Supply Air Reheat
Setpoint Failure
Used With: Dehumidificat
ion option.
Module: RTM
Supply Air Temperature
Cool Setpoint Failure
Used With: VVDA.
Module: RTM
Supply Air Temperature
Heat Setpoint Failure
Used With: VVDA.
Module: RTM
Supply Air Temperature
Sensor Failure
Used With: All units.
Module: RTM
RT-SVP07B-EN
Problem: The GBAS input
assigned to the Supply Air
Reheat Setpoint is out of
range (Temp< 60 F or
Temp > 90 F).
Check: The wiring between
the GBAS input assigned to
this setpoint and the
external device.
Problem: The source
assigned to SA Temp Cool
Setpoint is out of range
(Temp < 35 F or Temp > 95
F).
Check: Wiring and
external devices on the
associated RTM input.
Problem: The source
assigned to SA Temp Heat
Setpoint is out of range
(Temperature < 35 F or
Temperature > 185 F).
Check: Wiring and
external devices on the
associated RTM input.
Problem: The RTM Supply
Air Temperature 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.
The Active Supply Air
Reheat Setpoint reverts to
the default Supply Air
Reheat Setpoint defined at
the Human Interface.
The Active Supply Air Temp
Cool Setpoint reverts to the
default Supply Air Temp
Cool Setpoint defined at the
Human Interface.
The Active Supply Air Temp
Heat Setpoint reverts to the
default Supply Air Temp
Heat Setpoint defined at
the Human Interface.
These unit functions are
disabled:
a. Supply Air Tempering
b. Economizing
c. On CV units, the Supply
Air Temperature low limit
function is disabled.
d. On VAV units, the Supply
Air Temperature Control
heating and cooling
functions are disabled.
DIAGNOSTICS Menu
(PAR) An automatic reset
occurs after the source
input assigned to the
Supply Air Reheat Setpoint
input returns to within
range for 10 continuous
seconds, or after a
different, valid Supply Air
Reheat Setpoint source is
applied (BAS/Network).
(PAR) An automatic reset
occurs after the source
input assigned to the
Supply Air Temp Cool
Setpoint input returns to
within range for 10
continuous seconds, or
after a different, valid
Supply Air Temp Cool
Setpoint source is applied
(BAS/Network).
(PAR) An automatic reset
occurs after the source
input assigned to the
Supply Air Temp Heat
Setpoint input returns to
within range for 10
continuous seconds, or
after a different, valid
Supply Air Temp Heat
Setpoint source is applied
(BAS/Network).
(PAR) An automatic reset
occurs after the designated
Supply Air Temperature
input returns to its
allowable range. In order to
prevent rapid cycling of the
Diagnostic, there is a 10
second delay before the
automatic reset.
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