Compressor Bad | Heat Pump In Bypass | ?? - HVAC - Contractor Talk

Compressor Bad | Heat Pump In Bypass | ??

 
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Old 02-22-2019, 05:42 PM   #1
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Compressor Bad | Heat Pump In Bypass | ??


Hi everyone,

we just had a unit installed at a job site with a 5 Ton Heat Pump split unit. The lines are all good and it's holding it's charge right now on R-410a at around 70psig I know we may need to add more charge to the system.
We just ran the system on cooling to actually figure out if it hold's up when our R-410a bottle ran out so we havn't fully charged the system yet but we saw an issue and do like to know a bit more on the fact we do have a 5ton Air Handler with a TXV valve is is correctly installed.
When the compressor is running we don't get from the Amana 5 Ton unit which is an 18Sheer unit with an Emerson module no more error or alerts once we had passed under running condition the 100PSIG mark and we had the charge up to 145-150PSIG when we noticed the high pressure side had zero difference so :

Inside Airtemp : 80
Outside Airtemp: 75

Low PSIG running : ~150PSIG
High PSIG running : ~150PSIG


Heat Pump is a Amana ASC18 running on 240V 2 phase.



which is a sign of Compressor valves maybe blown or Heatpump is in bypass mode. When the system is shut off the PSIG drops down to around 70PSIG.

Myself I am rusty on HVAC my last system I worked on was like 15years ago and now with all those new features I am not 100% sure if the Compressor valves are blown or maybe something else. Our HVAC tech is also relative fresh of the bench so we may end up having to call in a local Company to help troubleshooting it.

Does anyone have Tips what to look/check for ?

Last edited by lumanet; 02-22-2019 at 07:33 PM.
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Old 02-22-2019, 07:09 PM   #2
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Re: Compressor Bad | Heat Pump In Bypass | ??


Is it a 3 phase condenser. If so, the line voltage may not be wired in proper phase, and the scroll compressor is running backwards. When a scroll runs backwards, it doesn't pump.

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Old 02-22-2019, 07:26 PM   #3
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Re: Compressor Bad | Heat Pump In Bypass | ??


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Is it a 3 phase condenser. If so, the line voltage may not be wired in proper phase, and the scroll compressor is running backwards. When a scroll runs backwards, it doesn't pump.
It is a ASZC18 Heat Pump running on 240V so 2 phase only.
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Old 02-22-2019, 07:56 PM   #4
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Re: Compressor Bad | Heat Pump In Bypass | ??


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It is a ASZC18 Heat Pump running on 240V so 2 phase only.
Could be the reversing valve is stuck between heat and cool position.
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Old 02-27-2019, 12:09 PM   #5
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Re: Compressor Bad | Heat Pump In Bypass | ??


What is the amp draw on compressor?

What is Super Heat Reading?

What is Sub cool Reading?

Are Your Service Valves open?

Is you hoses pressing the shrader core.

Could be alot of things but some more data would help someone help you a little eaiser.
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Old 02-27-2019, 04:04 PM   #6
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Re: Compressor Bad | Heat Pump In Bypass | ??


What is the amp draw on compressor?

8.9 AMP draw

What is Super Heat Reading?

not yet measured

What is Sub cool Reading?

not yet measured

Are Your Service Valves open?

Yes all open

Is you hoses pressing the shrader core.

Yes otherwise I would not get the pressure readings.

I was back onsite quickly in between customers and we ran the system which was at off position both at 75PSIG and as soon the Compressor and Fan kicked on I saw a 8.9 AMP draw towards the compressor which is normal.
the PSIG jumped quickly up 160PSIG on the low side and 150PSIG on the high side.

I than closed off the suction line and guess what. The pressure on the low side draw down and the high pressure came up to about 250PSIG. So Compressor seam to work leaves now the Valve been most likely stuck and not moving.

Just for reference the low pressure line get quickly extremely hot to the point you can't touch it with your bare hands.
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Old 02-27-2019, 05:04 PM   #7
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Re: Compressor Bad | Heat Pump In Bypass | ??


Is your suction hose on the service valve port or the true suction line service port. Sounds like unit is running in heat mode.

Check low voltage wiring to reversing valve.
jump the O wire to R and see what happens see if your reversing valve switches over

Make sure thermostat is set up for heat pump and the B/O terminal settings in the stat are set properly. Should be set for "O" to operate reversing valve.
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Old 02-27-2019, 09:33 PM   #8
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Re: Compressor Bad | Heat Pump In Bypass | ??


It would be a mf if both valves on your gauges were open. .
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Old 02-28-2019, 07:00 AM   #9
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Re: Compressor Bad | Heat Pump In Bypass | ??


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It would be a mf if both valves on your gauges were open. .
They are both closed :-) otherwise yes I should shoot myself :-)

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