CaptiveAire DOAS RTU Series, Инструкция по установке, эксплуатации и обслуживанию

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111
Oil Sensor
The oil level sensor monitors the
compressor’s internal oil level. Refer to
“Compressor Information” on
page 50 .
Low oil level, if sight glass is available,
check level.
Oil depositing itself in pipes. Increase
compressor velocity for short periods of
time.
Refer to
“Superheat and Subcooling”
on page 118 to check parameters.
Check oil level sensor wiring.
Check transformer voltages.
Oil level sensor failure, refer to
“Oil
Level Sensor (Sen-1)” on page 124 .
Envelope Cond
Temp High
Indoor and outdoor coil operating
temperatures are too high.
Follow possible checks for “Refrigerant
High PS”.
Refer to
“Superheat and Subcooling”
on page 118 to check parameters.
Envelope Cond
Temp Low
Indoor and outdoor coil operating
temperatures are too low.
Follow possible checks for “Refrigerant
Low PS”.
Refer to
“Superheat and Subcooling”
on page 118 to check parameters.
Envelope Angle
Indoor and outdoor coil operating
temperatures are out of range.
Follow possible checks for “Refrigerant
low PS” and “Refrigerant high PS”
Refer to
“Superheat and Subcooling”
on page 118 to check parameters.
Max Head Pressure The max head pressure for the
compressor is too high.
Refer to “Monitoring the A/C System”
on page 103 .
Check airflow.
Freezestat lockout
(optional)
The discharge temperature was too low
for a long period of time.
Check gas pressure.
Check for proper burner firing.
Use the HMI to reset.
Overheat Stat
lockout (optional)
The discharge temperature was too high
for a long period of time.
Check cooling system.
Use the HMI to reset.
Firestat lockout
(optional)
Intake or discharge temperatures
exceeded the firestat set point.
Use the HMI to reset.
Check for bad regulators, or modulating
valves.
Suction PS
MUA Board has detected a pressure
sensor failure.
Verify suction pressure transducer is
operating correctly and wired properly.
Temp Sens
MUA Board has detected a temperature
sensor failure.
Verify suction line temp sensor is
operating correctly and wired properly.
Check EEV, refer to
“Electronic
Expansion Valve (EEV-1)” on
page 128 .
DX/Condensation
Float Detect
Input signal from the drain pan float
switch.
Make sure the pan drain is clear and
water is draining.
Check for shorted wires.
Replace float switch.
Modbus System
Communication
Software mismatch.
Verify P410 (Modbus Address) is 21 on
VFD.
Problem Potential Cause Corrective Action