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Installed a 13 seer compressor in a 10 seer coil and condensing…

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Installed a 13 seer compressor...
Installed a 13 seer compressor in a 10 seer coil and condensing unit, I have a 7/8 pipping low side and 3/8 on the high side. The unit is cooling but not a full force, runs for 2 to 3 hours at the time and the pressures on the gages are 53 for the low side and 290 high side. What im I missing to make this unit work properly??
Submitted: 8 years ago.Category: HVAC
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Answered in 4 minutes by:
6/24/2010
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 8 years ago
BillyHvac
BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 23,154
Experience: Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
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You have an obstruction or blockage....you will need to reclaim, purge nitrogen through suction backwards through coil. If liguid line dryer in place remove or replace. Right now the suction is too low and the head too high.
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Customer reply replied 8 years ago
tried that, still the same readins on the pressures, and unit still running for hours at the time none stop
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 8 years ago

Well the basics are you pumping with a "back pressure" of 290......and only getting 50's back......what is the metering device?

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Customer reply replied 8 years ago
Just gages on (PSI'S) High side still 290 PSI and Low side still 51 PSI. temperature in the house not going below 75 degrees and now start to freeze.
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 8 years ago
What is metering device for flow.....cap tube, orifice or TXV?
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Customer reply replied 8 years ago

txv

 

HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 8 years ago
have you tried adjusting txv?...take sense bulb off suction line and hold it in your hand and see if suction line gets colder.
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