96 RT-SVP011E-EN
Troubleshooting
Suction Pressure
Sensor CktX
where X is “1” or “2”
Circuit
Immediate
Shutdown
Latching
Circuit X Suction Pressure sensor has failed out of
range.
Circuit X operation is terminated.
Remote
Suction Temperature 1
CktX
where X is “1” or “2”
Circuit
Immediate
Shutdown
Latching
The Suction Temperature sensor has failed out of
range for circuit X.
Circuit X operation is terminated.
Remote
Suction Temperature 2
CktX
where X is “1” or “2”
Circuit
Immediate
Shutdown
Latching
The Suction Temperature 2 sensor has failed out of
range for circuit X.
Circuit X operation is terminated.
Remote
Superheat High Limit
Lock
out CktX
where X is “1” or “2”
Circuit
Immediate
Shutdown
Latching
High superheat is detected and severe enough to
shut down the circuit.
Circuit X operation is inhibited.
Local
Supply Fan Bypass
Enabled
Unit Warning Non-Latching
This diagnostic is generated to notify system control
integrators that the unit is operating in Supply Fan
VFD Bypass mode.
Local
Supply Fan Bypass
Inte
rrupt Failure
Unit
Immediate
Shutdown
Latching
Any time the Supply Fans are not being commanded
On in Bypass Mode and a Flow Proving condition from
the Discharge Air Pressure sensor exists for 40
continuous seconds.
Unit operation is inhibited.
Remote
Supply Fan Bypass
Proving Failure
Unit
Immediate
Shutdown
Latching
Any time the Supply Fans are being commanded On
in Bypass Mode and a No-Flow Proving condition from
the Discharge Air Pressure sensor exists for 40
continuous seconds.
Unit operation is inhibited.
Remote
Supply Fan X Proving
Fa
ilure
where X is “1” or “2”
Unit Warning Latching
Any time Supply Fan X is being commanded On in
Bypas
s Mode and a No-Flow Proving indication from
the fans VFD exists for 40 continuous seconds.
Failure of fan X with other fan available:
Generate “Supply Fan X Proving Failure”
diagnostic and lockout all heating operation.
Failure of fan X with other fan not-available:
Generate “Supply Fan X Proving Failure” and inhibit
unit operation.
Remote
Unexpected
Compressor Shutdown
CprsrXY
where X is “1” or “2”
where Y is “A”, “B” or
“C”
Circuit
Immediate
Shutdown
Latching
The fixed speed compressor Y proving input on circuit
X has opened while the compressor is operating.
Sources for this condition are High Pressure Cutout
switch opening, a fault from the compressor
protection module, contactor failure or wiring.
Circuit X operation is inhibited.
Local
Unit Economizing When
It Should Not
Unit Warning Non- Latching
The unit is in active e
conomizer cooling. The
economizer (OAD) command has been lower than the
economizer position by 10% for 5 continuous
minutes.
No unit response.
Remote
Diagnostics Target Severity Persistence Condition / Response Reset Level
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