saltydawg

SOS, Red

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The old-school AC/heater combo unit in my shop stopped blowing cold air. The compressor is not kicking on...just blowing room temp air. Is it worth parts swapping and, if so, do I start with the capacitor? 

 

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Is compressor making any noise like it’s trying to start?

if so the capacitor is worth a try, if not try jumping the thermostat 

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4 mins ago, ted527 said:

Is compressor making any noise like it’s trying to start?

if so the capacitor is worth a try, if not try jumping the thermostat 

When I crank the temp control to the coldest setting, the compressor doesn’t make noise like it did when it cooled. 

 

What does “jumping the thermostat” mean?

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3 mins ago, Sandflee said:

looks like an antique, imagine its not too efficient 

Oh, it’s old, loud and inefficient...but it’s worked like a dream forever. 

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Should be two wires going to the thermostat, hook em together,

Does it click at all? Turn it to heat , and all the way down if the heat doesn't cycle off it's the thermostat, wack it with a screwdriver handle, report back,

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15 mins ago, saltydawg said:

When I crank the temp control to the coldest setting, the compressor doesn’t make noise like it did when it cooled. 

 

What does “jumping the thermostat” mean?

Connecting the wires directly that would be going to the thermostat. In a residential or commercial thermostat the wires would be labeled per standard, but in a window unit who knows. It sounds like it’s either the cap or the low gas limit switch is trying to protect the compressor by not letting it kick on. If you know a guy they may be able to charge it for you and, as they say around these parts “put the cool back in it, yo” 

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Bypass thermostat, with it being a heat/cool unit you will need to figure out what wires go to compressor.

if you open unit up look around electric connectors for a burnt off wire. Not uncommon for a unit that age.

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1 min ago, ted527 said:

Bypass thermostat, with it being a heat/cool unit you will need to figure out what wires go to compressor.

if you open unit up look around electric connectors for a burnt off wire. Not uncommon for a unit that age.

Good catch... just saw the heat on there. 

2 mins ago, redfishkiller said:

There may be three wires on the thermost, dont jump anything yet.

Never mind.

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1 min ago, chessie_yaker said:

Connecting the wires directly that would be going to the thermostat. In a residential or commercial thermostat the wires would be labeled per standard, but in a window unit who knows. It sounds like it’s either the cap or the low gas limit switch is trying to protect the compressor by not letting it kick on. If you know a guy they may be able to charge it for you and, as they say around these parts “put the cool back in it, yo” 

That old pos doesn't have a low pressure  switch.

 

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