High ambient AC Start
High ambient AC Start
(OP)
I have a client with a system shutdown on high head pressure when trying to start his AC system at 130 DegF ambient at the condenser and the evaporator. If the pressure switch is jumpered out, the system will run and drop to normal operation pressures after 20-30 seconds. Any recommendations for this start-up condition? Will a crankcase regulating valve prevent the suction pressure from causing high head pressure on discharge side?





RE: High ambient AC Start
motor against overloading due to high suction pressure, it is important to arrive at the correct pressure setting to offer this protection. The best way to see if the motor is overloaded is to check the current draw at start-up or after a defrost cycle. If an overloaded condition is evident, a suction gauge should be put on the compressor because the CRO setting may be too high and may have to be adjusted. For more information go here:
http://www.sporlanonline.com/SD-036.pdf
RE: High ambient AC Start
RE: High ambient AC Start
RE: High ambient AC Start
If the high pressure is not normal but the switch is ok you may have a faulty/dirty expansion device.
Only if this fails I agree with the other suggestions.
RE: High ambient AC Start
RE: High ambient AC Start