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Thread: Pressure transducer problem
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13-09-2009, 05:20 PM #1
Pressure transducer problem
I was working on a Lennox unit KVHK48D the other day that has 2 circuits each circuit has 1 compressor, 1 accumulator , 1 condensor fan etc.
My problem is circuit 2 was tripping on HP due to high head pressure caused by an actuator that controlls dampers (which were closed) for the head pressure but each circuit doesnt have a seperate actuator/damper they share 1 on the condensor coil.
Also the pressure transducer that controlls the actuator is in the discharge line of circuit 1 only.
When circuit 2 starts up alone then the dampers are closed causing the HP to rise, it's only when circuit 1 starts up that the dampers begin to open.
For the life of me i can't figure out how it is supposed to work.
Why only have 1 pressure transducer controlling 2 circuits?
The difference between genius and stupidity is that genius has its limits.
Marc
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13-09-2009, 11:01 PM #2
Re: Pressure transducer problem
Perhaps circuit 1 is the duty circuit and and second one kicks in when the load increases.
Brian - Newton Abbot, Devon, UK
Retired March 2015
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14-09-2009, 06:59 AM #3
Re: Pressure transducer problem
That could be the case but the 2nd one starts up before the first one sometimes.
I tried ringing technical to ask them but i was put through to a guy in France that didn't know.The difference between genius and stupidity is that genius has its limits.
Marc
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