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I just installed a GSC140421 using a coil CAPF

I just installed a GSC140421 using a coil CAPF 3642 . the problem is I can not get right pressure. low pressure is 80 psig high side pressure is 180 psig.

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Hey there, the matching coil for your unit is a Model# CAPF4860C6A. The coil you have installed is a 13 seer where the condenser is a 14 seer. Myy guess at this point without being there is you have a hot house (80 psi suction) while eliminating more heat from the condenser (180 psi). I am also guessing you are using r-22? If you could post your super heat and subcool readings and if ou have a txv or fixed orifice (guessing txv?) I could help you pinpoint the problem.

Posted on Aug 02, 2009

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Posted on Jan 02, 2017

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Above 78F no longer works gives heat head pressure is 300 and slightly above while low side varies bet 45 and 55 psi,noise in the return. i have about 85 feet of coil run 3/8 high side and 3/4 return from...

Your head pressure is a little high, depending on the ambient temp and your suction pressure is a little low. The suction pressure should be around 68 psig, the equivalent of a 40 degree coil. You can try adding a little refrigerant, check your compressor amp draw. If head pressure keeps going up and suction doesn't come up you may have a restricted metering device or filter dryer

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Can low air flow across the evaporator coil cause the high pressure cutout to trip on a heat pump during the summer? If so, how.

No, Just the opposite will happen. If you have low air flow across the Evap. this will cause the refrigerant to "puddle" or become dormant. Causing low head due to evap. frosting or coil freeze up. With low air flow your system is not transferring heat to the refrigerant in the evap. coil, so it (the evap coil) just gets colder and colder, lowering the pressures. Here are things which cause Hi head pressure, dirty condenser coil, low air flow across the condenser coil, air in the system, bent or kinked tubing before the evap. coil. Crushed fins (causing restricted air flow) in the condenser coil. With low air flow across the condenser coil, you can not "cool" the refrigerant, in other words get the heat out, it stays in the refrig. and kind of cooks the system. If your system is shutting off due to hi head, get a water hose and clean your outside coil first. Pull the power cut off, should be right there at the outside unit. turn it off at the t-stat. pull the power at the unit. Wash the condenser coil good. Do not use a press. washer as they can bend the coil fins making things worse. Use a bit of soap in a bucket, fill that with water and splash into the coils let that sit and hose it out. It is best if you can work from inside out (opposite of air flow across the coil, backwashing) but you have to remove the fan shroud to do so. If after you wash the coil, you still have a hi press issue you will need to do more troubleshooting. Hope this helps Fix Ya up.

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Probably costly and maybe time for a new one vs. repair? Be sure your coil behind the air filter is clean? and be sure the coil outside is clean?You could take the unit outside and clean both coils with a garden hose but be careful not to over pressurize the coils because the fins bend easy,use an up and down motion not side to side.Let unit drain and reinstall and try

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