tropicold
28-12-2009, 09:43 PM
Hello and a happy Christmas season to all !!
First the facts:
+ 5 year old equipment
+ Copeland 6D compressor
+ Demand Cooling, head fan, oil cooler
+ R-22, low temp, air cooled condenser
+ Multiple evaporators (5): independent suction and liquid lines, all routed to suction and liquid manifolds
+ Temperatures in freezers: three of them -12 deg C, one -7 deg C, the other one does not get below -5
+ Suction pressure: 1.2 bar
+ Condensing pressure: 13 bar
+ Main liquid line sight glass: clear
+ Suction line temperature at compressor: not above 18 deg, lot of condensation
+ Head temperature: not above 115 deg
Now the problem: demand cooling system operates almost continuously.
I learned that the liquid solenoid activates around 140 deg of head temperature, so I tried replacing the control module with a new one just in case it was out of calibration. No change.
Now the question: if there is no apparent reason for the overheating of the compressor, why is the DC operating most of the time ?
Best regards.
First the facts:
+ 5 year old equipment
+ Copeland 6D compressor
+ Demand Cooling, head fan, oil cooler
+ R-22, low temp, air cooled condenser
+ Multiple evaporators (5): independent suction and liquid lines, all routed to suction and liquid manifolds
+ Temperatures in freezers: three of them -12 deg C, one -7 deg C, the other one does not get below -5
+ Suction pressure: 1.2 bar
+ Condensing pressure: 13 bar
+ Main liquid line sight glass: clear
+ Suction line temperature at compressor: not above 18 deg, lot of condensation
+ Head temperature: not above 115 deg
Now the problem: demand cooling system operates almost continuously.
I learned that the liquid solenoid activates around 140 deg of head temperature, so I tried replacing the control module with a new one just in case it was out of calibration. No change.
Now the question: if there is no apparent reason for the overheating of the compressor, why is the DC operating most of the time ?
Best regards.