Lennox SCA 010 Installation, Operation & Maintenance Manual page 110

SAFETY AND ERROR CODES SAFETY AND ERROR CODES SAFETY AND ERROR CODES SAFETY AND ERROR CODES SAFETY AND ERROR CODES
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Refrigeration system faults
Faulty condenser temperature sensor
Faulty pressure transmitter sensor, refrigeration system
Faulty refrigeration system, frost temperature sensor
High pressure switch safety or compressor electrical safety
The compressor contactor is not connected although the CLIMATIC requests it.
- The high pressure pressostat is open.
- The internal protection of the compressor motor is open.
The high pressure pressostat and the compressor motor thermal protection act directly
on the compressor contactor. This information is transmitted to the CLIMATIC via an
auxiliary contact of the contactor.
If the CLIMATIC gives the order to operate to the compressor and if the auxiliary contact
is still open 5 seconds later, the fan safety system is activated and stops the
compressor.The safety system automatically cuts out after 4 minutes.
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.
Faulty low pressure compressor
If the low pressure pressostat is open and the compressor has been operating for more
than 2 minutes, the low pressure safety system is activated and stops the compressor.
This safety system is not taken into account during the defrost cycle for the heat pump
units.
The compressor is engaged when the pressostat contact closes.
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.
IOM / Rooftop Smart and Linéa™ Range - Page 109