Trane S*HF*20-75 Troubleshooting Manual page 137

Table 11: Diagnostics Troubleshooting Chart (continued)
SZVAV HW
Configuration Failure
Used With: SZVAV units.
Module: RTM
Space Press Low Limit
Trip Auto Reset
Used With: Return Fan w/
Statitrac.
Module: RTM
Space Press Low Limit
Trip Warning
Used With: Return Fan w/
Statitrac.
Module: RTM
RT-SVP07B-EN
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.
Problem: The building's
space pressure has
dropped below the Building
Pressure Low Limit
st
Setpoint for the 1
or 2
time out of 3 occurrences
Check: Check return
plenum pressure, exhaust/
return damper actuators,
etc.
Problem: The building's
space pressure has
dropped below the Building
Pressure Low Limit
Setpoint plus 0.02 IWC.
Check: Check return
plenum pressure, exhaust/
return damper actuators,
etc.
The unit will not honor the
Single Zone VAV control
sequence. The unit will
perform normal Zone
Temperature control
(CVZT).
The unit will trip all outputs,
de-energize dx cooling,
staged heating, fans, etc.,
and will drive all analog
nd
ouputs closed/stop, fan
speed, dampers,
modulating heat, etc.
Information only.
DIAGNOSTICS Menu
(PAR) An automatic reset
occurs after the user has
accessed and followed the
instructions on the Human
Interface SZVAV
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.
(PAR) An auto reset occurs
when the building's space
pressure has risen above
the Building Pressure Low
Limit Setpoint plus .02
IWC.
Note: Each occurrence will
increment a counter which
upon the third occurrence
will generate a manual
reset diagnostic. The
counter will be cleared if
the building pressure ever
exceeds the building
pressure setpoint bottom
deadband.
(PAR) An auto reset occurs
when the building's space
pressure has risen above
the Building Pressure Low
Limit Setpoint plus .03
IWC.
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