What was the outdoor temperature, and indoor temperature, when the unit was discharging 68*?
Does it always discharge this low of a temperature, or just when the unit is in defrost?
We hope this is an appropriate question for this section - if not we apologize.
Our church has a small chapel heated by a six year old York heat pump with electric auxiliary back up.
In weather below 32 degrees the temp at registers is about 68 degrees briefly until aux heat starts and brings air at registers up to high 80's.
Problem: When room temp approaches thermostat setting the system reverts to heat pump only and blows 68 degree air again that congregants say is 'cold air'. The congregation is seated and reluctant
to move to another seat (& there may not be any other empty seats).
HVAC tech says everything is working normally and from what I've read I agree.
The thermostat will show aux heat is ON but the system design seems to be that the aux heat boost turns off 1.5 to 3 degrees short of the thermostat setting. We don't understand why. If the heat pump can't heat the room why go back to heat pump mode ?
We did find that on EmHeat the heat pump does not operate at all so no 'cold air' but it's apparently not recommended that Emergency heat be used this way.
If we had an outside temperature sensor & appropriate thermostat installed would that change the operation so that 'cold air' from heat pump would not blow after the aux heat turned OFF ?
Any other thoughts or solutions that we could pass along to our HVAC tech / company ?
Thank you,
Church Member
What was the outdoor temperature, and indoor temperature, when the unit was discharging 68*?
Does it always discharge this low of a temperature, or just when the unit is in defrost?
“I haven’t failed. I’ve just found 10,000 ways that won’t work.” - Thomas Edison
“It’s not whether you get knocked down, it’s whether you get up.” - Vince Lombardi
"In this house we obey the laws of thermodynamics" - Homer Simpson
Local 486 Instructor & Service Technician
25 degrees outside , 60 degrees inside (it had been turned down overnight).
68 degrees output only in this cold weather (We should get an output temp on a warmer day but don't have that at the moment)
Unit is not in defrost mode that we're aware of - doubt it would be if it just started running.
Should be getting warmer than 68 degree air when its 25 outside. Sounds like there may be a problem with the heat pump, unless its a 30 plus year old one.
There are thermostats that will satisfy the heat call with the heat pump and aux heat running at the same time.
How did the Heat Pump work 5 or 4 years ago, this being a 6 year old unit ( may have to ask someone with more history with this unit ) if it was the same output temperatures at the same supply register at similar conditions then to me it never was set up correctly from day one, such as refrigerant charge, duct leakage on return side, blower fan speed incorrect, ductwork or fan section in cold environment, mismatched systems etc. etc.