Question about Carrier Air Conditioners
Well I dont know what refrigerant your working wqith but I know the oil press sw's Ive dealt with open after a senmce of NO pressure Difference between Crank case and Oil pump Output pressure. You'll have to pump down the compressor and install an access tee for telling you what your oil pressure is and then subtract the suction pressure for true oil pressure. Usually the oil press sw is set at factory and is tween 7 and 20 psig. If it dosnt see this pressure a heater on the OP sw will energize and if the difference isnt senced withing the heater time limit it causes the points to open shutting off the compressor. If oil press is indeed low You could have bad oil, bad screen inlet to the pump or worn out pump or low oil. BEWARE LOW REFRIGERANT CAUSES OIL TO SETTLE OUT DURING A RUN CYCLE. So if you add some oil then Refrigerant Be ready to take the oil back out important to measure how much in so you dont take out too much. Low back pressure from anything from low charge to a TXV or other valve not feeding correctly. This pressure being low can allow oil to settle anywhere eccept tyhe crank case. The Refrigerant returning toi the compressor caries it back usually unless its piped in incorectly where the oil can trap OUT of the system and not be brought back. .
Posted on Mar 02, 2009
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EACH OF THE FOLLOWING STATUS CODES IS A TWO DIGIT NUMBER WITH THE FIRST DIGIT DETERMINED BY THE
NUMBER OF SHORT FLASHES AND THE SECOND DIGIT BY THE NUMBER OF LONG FLASHES.
43 LOW-HEAT PRESSURE SWITCH OPEN WHILE MEDIUM-HEAT PRESSURE SWITCH IS CLOSED - Check for:
- Low inlet gas pressure (if LGPS used).
- Plugged condensate drain.
- Improper pressure switch wiring.
- Water in vent piping, possible sagging pipe.
- Stuck open low-heat pressure switch.
- Disconnected or obstructed pressure tubing.
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