heat pump blows cold air during defrost
xracer
13 years ago
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maryland_irisman
13 years agoRelated Discussions
heat pump-defrost cycle
Comments (20)"He didn't check the strips--just made it defrost and said it was kicking in according to the amps." - The 10 kw strips consist of two 5 kw sections. Only one 5kw section may be operating properly. Bad wire or bad sequencer. Get his a$$ back and have him meter the strips while the condenser is in defrost to make sure that all strips are energized. If you have 10kw strips and both are working fine, replace them with 15 kw strips (Goodman part# HKR-15C, approx $100). Did he check the air temperature after the strips to see if you were getting the 76 degrees that he stated? "The defrost is on 60 min. I need to change this to 90??" - Depending on climate and conditions, a longer defrost initiation time saves you money and helps with wear-n-tear on your system. I moved mine from 60 to 90 minutes with no problems with freeze-up, in Baltimore. FYI 10 kw electric strips provide an approximate 26 degree temperature rise at 1200 CFM fan speedd. If the air temp before the coil is 50 degrees, then the air temp after the coil is 50 + 26 = 76 degrees. If one of the 5 kw strips is not working, then 5 kw provides only a 13 degree rise, so 50 + 13 is 63 degrees. This will cool the house. 15kw strips provide a 40 degree rise in temperature. Good luck....See MoreCold air during defrost cycle. What's wrong?
Comments (3)There should be a wire that comes off of the outside unit that is the signal that it is in defrost mode and on my IAQ it goes to one of the stages of strips. Defrost starts and activates that one set of strips with power (24v) coming from the outdoor unit to the strip lug on the IAQ. The thermostat is actually 'out of the loop' as far as defrost works on my system. The thermostat makes a call for heat and the heat pump starts.. the heat pump makes a call for defrost and sends the signal back to the wire that activates the heat strips via the lug on the IAQ control. With this in mind the first thing to check is if everything is okay on emergency heat to find the control wire from the outside unit and make sure it is connected and connected correctly. ***NOTE**** I did upon first install with the new unit and staged strips have an issue with 'cool' air at defrost but not COLD. The strips are staged at 70/30 and the defrost wire was connected to the 30% stage of the strips and wasn't enough to temper the air. I switched it to the other stage of strips and now have 90 degree air instead of 70....See MoreHeat Pump Defrost Balance setting
Comments (1)I'm not quite sure, but I think 1) is 'yes'. For 2), those numbers seem quite high for a high efficiency unit like yours. I would expect it to be down in the 20/30s....See MoreHeat Pump Defrost & Electric Heat strips?
Comments (2)Posted by tigerdunes (My Page) on Thu, Jan 22, 15 at 12:11 If your defrost function and aux heat strips are operating correctly, you should get warm air. Remember the HP is now acting as an AC condense and the heat strip is used to temper the cold air. The outside condenser fan does not run in defrost function. Good quality hP thermostats usually have some indicator on the face showing aux or emergency heat strip operation. Can't say about the 950. IMO Thanks for the feedback TD. Yeah, I've searched everywhere on net & in owner's manual & I can't find any signs of Aux/Emerg heat status when it's running. I know when I force it manually into emergency heat, it shows an "E" on one of the settings icons but otherwise when I turn emergency off, it doesn't show anything if it defrosts. This post was edited by pbx2 on Thu, Jan 22, 15 at 12:51...See Moresparky823
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