Question about Whirlwind FH-778 Air Conditioner

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5 ton split LG UNIT brand new about 1 year old.

The lowside pressure is listed 90-100psi. i clean the condenser and the evaporator coil and filter. check the oms reading on the compressor which is ok. i notice the compressor is so hot. i grab me 2 bags of ice to cool down the compressor. then i start the unit and pressure went down to 70 then i goes back to 90-100 range. my partner told me it might be the compressor is not pumping well or it overheated. Can you help me out?

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Look up the term BLACK DEATH.


90-100 psi is very high on the low side.

Without spending too much time,I would pull a vacuum to -28 inch of mercury and let it sit over night.

Monitor the manifold garage for leak. (rise of inch of mercury)

My bet is the low quality LG compressor's worn out metal part is in the condenser.

Blockage will increase the low side PSI.

You can buy HVAC blow out can/chemical to clean line before you vac and fill the refrigerant.

Please let me know what's you founding is on reply.



Posted on Jul 11, 2010

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