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HP TO HIGH IN REVERSE CYCLE

Faulty hp pressure switch(off:33kgf/cm on:24/kgf/cm)replaced with danfoss hp-auto pres/switch.Refrigerant R22

In cooling cycle, hp1500kpa lp380kpa
On Heating, hp to high 3000kpa.Pype size 3/4 &1/2 inch.

Indoor unit: fan-HI
Outdoor unit: condensor fans cut in and out

Why hp to high in reverse cycle?

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  • Coenie May 27, 2008

    LG CASSETTE SPLIT

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If the refrigerant charge was improperly adjusted at any time you may have the indications of an overcharge in your system causing the high pressure to trip out. The name plate on these indicates the proper charge and it is critical to the ounce.

Posted on May 27, 2008

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There are a few things that can cause the compressor/condenser fan no to start.

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The high side/low side pressure equalization you describe is normal for a compressor sitting idle.

If you have an ohm meter you can check the compressor windings for opens and shorts. If your compressor is 3 phase as you state (this would be very unusual for a residential unit) you should have continuity across all 3 phases and no continuity to ground. Take the compressor out of the circuit before you check.

If the compressor does have crankcase heat, it should have been left on for at least 24 hours before starting the unit. Another cause for failure could be overcharging which could have resulted in refrigerant slugging back to the compressor.

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