Lennox SCA 010 Installation, Operation & Maintenance Manual page 109

SAFETY AND ERROR CODES SAFETY AND ERROR CODES SAFETY AND ERROR CODES SAFETY AND ERROR CODES SAFETY AND ERROR CODES
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Page 108 - IOM / Rooftop Smart and Linéa™ Range
Customer error
A fault has been detected, external to the unit.
WATER HEAT EXCHANGER OUTLET TEMPERATURE SAFETY SYSTEM.
Condenser Water Temperature Too Low
If the temperature of the water loop is less than or equal to the preset setpoint [C89] during
the operation of one of the compressors, the condenser safety mechanism is applied. The
compressors are stopped.
This safety mechanism automatically cuts out if the loop temperature exceeds 4°C from this
setpoint.
It is also automatically locked out after 3 failures within a day. In this case, manual resetting is
obligatory. The counter is reset to zero every evening at 20:00 if its value does not exceed 3
failures.
Condenser Water Temperature Too High
The temperature of the water loop is greater than or equal to the preset setpoint [C90] during
the operation of one of the compressors, the condenser safety mechanism is applied. The
compressors are stopped.
This safety mechanism automatically cuts out if the loop temperature is less than 4°C from
this setpoint.
It is also automaticallylocked out after 3 failures within a day. In this case, manual resetting is
obligatory. The counter is reset to zero every evening at 20:00 if its value does not exceed 3
failures.
Faulty Water Flow
If the contact of the water flow controller is open for more than 20 seconds, the condenser
safety mechanism is applied. The compressors are stopped.
This safety mechanism automatically cuts out if the loop temperature is less than 4°C from
this setpoint.
It is also automatically locked out after 3 failures within a day. In this case, manual resetting is
obligatory. The meter is reset to zero every evening at 20:00 if its value does not exceed 3
failures.
Error : Smoke
If the contact closes due to the smoke detector card, the smoke safety mechanism is activated.
The unit is completely shut down and the fresh air louver is set to the fresh air position.
This safety mechanism is automaticallylocked out. In this case, manual resetting is obligatory.