124 RT-SVP04F-EN
System Testing & Troubleshooting
Diagnostics
There are four types of diagnostics:
1. (PMR) Partial System Disable, Manual Reset
2. (PAR) Partial System Disable, Auto Reset
3. (INFO) Information Only
4. (HO) History Only
The following Troubleshooting chart list possible Failure Modes and:
1. The Diagnostic Displayed on the Human Interface’s LCD screen and if it is a PMR,
PAR, INFO or HO diagnostic.
2. The condition which caused the failure mode to occur or the Reason for Diagnostic.
3. The UCM’s Reaction to the failure mode.
4. The Reset Required to remove the diagnostic.
DIAGNOSTIC DISPLAYED REASON FOR DIAGNOSTIC UCM’S REACTION RESET REQUIRED
Auto Reset Return Pressure
Limit Trip.
Problem: Return Plenum
Pressure exceeds the return
Plenum Pressure High Limit
(single Trip).
Auto Reset Return Pressure
Limit Trip.
Problem: Return Plenum
Pressure exceeds the return
Plenum Pressure High Limit
(3.5 iwc non-adjustable)
continuously for 1 second
A "Return Pressure Shutdown"
signal is sent to the following
functions: Compressor Staging
Control; Economizer Actuator
Control; Heat Operation;
Supply Fan Control and Proof
of Operation; IGV Actuator
Control; Return Fan and Proof
Operation. The Return
Pressure High Limit trip
counter is incremental.
(PAR) An automatic reset
occurs when the Return
Plenum Pressure drops below
the Return Plenum Pressure
High Limit, the VFD closes
completely, and 15 seconds
have elapsed since the
shutdown command was
issued.
Auto Reset SA Static
Pressure Limit
Problem: The Supply Air Static
Pressure went too high.
The SA static pressure
exceeded the SA static
pressure limit SETPOINT for at
least one second continuously.
A "Supply Air Pressure
Shutdown" signal is sent to
the following functions;
a. Compressor Staging
Control,
b. Economizer Actuator
Control,
c. Heat Operation,
d. Supply Fan Control,
e. Return Fan Control,
f. IGV / VFD Control,
g. Exhaust Fan Control,
h. Exhaust Actuator Control
(PAR) An automatic reset
occurs after the Inlet Vanes
have closed. The Supply Fan
will not be allowed to restart
for 15 seconds after the
diagnostic has occurred.
BACnet Communications
Interface (BCI) Module
• None • None • None
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