Question about Heating & Cooling
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Posted on Jan 02, 2017
If you are low on refrigerant, and if you have a low pressure switch, it will not allow the compressor to come on in heat or cool, until you put a jumper across the low pressure switch or add enough refrigerant to get the pressure up to close the switch. You can only add refrigerant to a system if the bottle pressure is higher than the unit pressure without the compressor running.
Normally a technician will hook his gages up if suspects the unit is low on charge or he will push the contacts closed on the contactor and feel the suction line to see if it's cold.
Posted on Aug 07, 2009
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