Trane Horizon OANG Series - Page 70

Alarms and Troubleshooting
70 OAU-SVX006E-EN
BV-19
Diagnostic: Space Humidity
Sou
rce Failure
Auto Reset. Occurs when the space
humidit
y active falls outside of
range
• BAS communication down
• Failed sensor or improper sensor installation
• Humidity Wiring Polarity sensitive
BV-22
Diagnostic: Compressor Fail Unit
Lock
out
Manual Reset
Occurs when there is a compressor run failure and the
d
ischarge air temperature is 5°F from setpoint, or the
dehumidification temperature is 5°F during dehumidification.
BV-24 Diagnostic: Exhaust Fan Failure Auto Reset
Occurs when there is a call for exhaust fan but there is no
s
tatus for three minutes
BV-28
Diagnostic: Condensate
Ov
erflow Unit Lockout
Auto Reset
• Occurs when the condensate switch is open and the discharge
air temperature is 5°F from setpoint, or the dehumidification
temperature is 5°F during dehumidification.
• Shuts down entire unit until 5 minutes after the condensate
sw
itch closes.
BV-29
Diagnostic: Low Refrigerant
Pr
essure Circuit 2
Auto Reset
Occurs when circuit 2 is running and the suction pressure
tr
ansducer reads below 90PSI (cooling) or 55PSI (heat pump)
for two minutes.
BV-30
Diagnostic: Duct Static Pressure
Se
tpoint Range
Auto Reset
Occurs when the duct static setpoint is above 85% of the
maximum li
mit for the hardwired input, below 5% of the full
scale input, or less than the minimum.
BV-31
Diagnostic: Liquid Line
R
efrigerant Pressure Circuit 1
Source Failure
Auto Reset
Occurs when circuit 1 is running and the liquid line transducer
i
s outside of the 150- 650PSI range for two minutes.
BV-32
Diagnostic: Liquid Line
R
efrigerant Pressure Circuit 2
Source Failure
Auto Reset
Occurs when circuit 2 is running and the liquid line transducer
i
s outside of the 150- 650PSI range for two minutes.
BV-33
Diagnostic: Low Outdoor Coil
Wa
ter Flow
Auto Reset
• Occurs when the supply fan is
• running and the outdoor coil water flow switch is open.
BV-34
Diagnostic: Dehumidification
T
emperature Sensor Source
Failure
Auto Reset
• Occurs when the indoor coil leaving or discharge air
temperature/humidity sensor
• falls outside of range.
BV-35
Diagnostic: Compressor 1 Run
Fa
ilure
Manual or Auto Reset
• Occurs when there is a call for a compressor without a run status
for five minutes. Auto
• resets after three hours.
BV-36
Diagnostic: Duct Static Pressure
Sou
rce Failure
Auto Reset
• Occurs when the supply duct
• static pressure transducer reading falls outside of range.
BV-37
Diagnostic: Outdoor Coil Water
Te
mperature Low
Auto Reset
Occurs when the supply fan is running and the outdoor coil
water low temperature switch is open.
BV-38
Diagnostic: Low Refrigerant
Pr
essure Circuit 1
Auto Reset
Occurs when circuit 1 is running and the suction pressure
tr
ansducer reads below 90PSI (cooling) or 55PSI (heat pump)
for two minutes.
Table 14. Diagnostic values (continued)
Name Manual or Auto Reset Possible Causes