heatpump problem - http://www.hvacmechanic.com/ Forums
Original message
| tim6820
 |  "heatpump problem"
, posted Sun 20 Jul 22:00  
ok last week I had extremly high head pressure on a 2 1/2 ton rheem heat pump (350 to 400). Coils were clean, drier clear so I replaced the txv. Pressures returned to normal 250 and 75. Now the unit will not get the temp in the house below 75 degrees during the hottest part of the day. The really odd part is when the head pressure was so high it cooled the house just fine. cycled on and off just fine and now it runs continuous from noon to dark and runs fine all night. This unit is slated to be replaced soon but I would like to know what is causing this.
Tim
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Replies:
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| mississippi
| "Re(1):heatpump problem" , posted Sun 20 Jul 22:10
may need to adjust txv if adjustable.
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| | tim6820
| "Re(2):heatpump problem" , posted Sun 20 Jul 22:14
txv has a bulb not adjustable as far as i can tell. I am a chilled water and chiller installer I know enough about split units to mess one up.
Tim
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| | mississippi
| "Re(3):heatpump problem" , posted Sun 20 Jul 22:19
whats your subcool temp. could be slightly low on freon
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| | tim6820
| "Re(4):heatpump problem" , posted Sun 20 Jul 22:27
ok subcooling is the differce in temp from the guage and the temp of the suction line right.
Tim
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| | tim6820
| "Re(5):heatpump problem" , posted Sun 20 Jul 22:36
I have tried adding a little freon to it but it just make the head pressure go up and the air temp at the unit seems to go down.
Tim
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| | theduke03
| "Re(6):heatpump problem" , posted Wed 23 Jul 19:36:
I think you should have washed the condenser reguardless of it's appearance, then measure your suction and liquid line temps as well as the outdoor ambient temp. Otherwise pressures are relatively meaningless. Subcooling is the difference between the liquid line temp and high side saturation temp(on gauge).
Same thing as a chiller.
"My dad was the most feared furnace fighter in Northern Indiana."
[this message was edited by theduke03 on Wed 23 Jul 19:43] |
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