tarrco
Well-known member
Does anyone know the correct refrigerant to put in basement heat/ac for a 2004 Winnebago Adventurer? Thanks all and Happy New Yr.
The temperature outside today is 0 degrees Celsius (32?F) but it should still heat up right?
tarrco said:Thank you all. Got my pump running but I guess you guys are right, temperature outside is too low. New residential heat pumps work as low as minus 20C.
They have defrosters for the condenser coil which permits them to operate in low temperatures.tarrco said:Thank you all. Got my pump running but I guess you guys are right, temperature outside is too low. New residential heat pumps work as low as minus 20C.
I am talking about the newer hi efficiency ones. I had never heard of a coil defroster. When the temps get below where the heat pump can pull enough heat out of the air my (House) system has a built in electric heating element for heat. In the coach it switches to gas heat.John Canfield said:Not in the south, just a defroster.
You might be talking about commercial or industrial applications, but my residential Trane 2-stage variable speed VX20i heat pump is supposed to be the most efficient on the market and it uses a "defroster" like John says to thaw the coils when the temp drops. Once the heat pump gives it up, the system switches to natural gas furnace. Its fun to watch mine clear a snow drift around it after a good snow and the temps come back up.WILDEBILL308 said:I am talking about the newer hi efficiency ones. I had never heard of a coil defroster. When the temps get below where the heat pump can pull enough heat out of the air my (House) system has a built in electric heating element for heat. In the coach it switches to gas heat.
That doesn't look like it is very cost effective to spend energy to heat coils when the temperature is below where you can get enough heat for practical use.Mile High said:You might be talking about commercial or industrial applications, but my residential Trane 2-stage variable speed VX20i heat pump is supposed to be the most efficient on the market and it uses a "defroster" like John says to thaw the coils when the temp drops. Once the heat pump gives it up, the system switches to natural gas furnace. Its fun to watch mine clear a snow drift around it after a good snow and the temps come back up.
Heres a youtube of a smaller unit in defrost
https://www.youtube.com/watch?v=rbiultu6a3U
I actually don't use it much these days because the cost of natural gas is low so its not cost effective anymore.
It is what it is Bill - Obviously the defroster removes from the efficiency but it only runs long enough to clear the coils. Just part of living in a 4-season state.WILDEBILL308 said:That doesn't look like it is very cost effective to spend energy to heat coils when the temperature is below where you can get enough heat for practical use.
Bill
Residential heat pumps have always had a defrost mode since inception. Most have a thermister burried in the coil and when it reaches a certain temp, it switches to air conditioner mode to defrost the coils. I've seen coils with 4 to 8 inches of ice built up on them when the defrost board have failed. Not a pretty sight when you're a HVAC service man, let me tell ya. Most systems disable the heat pump at a certain out door air temp now. As a HVAC service tech for 25 years in a Northern state, I don't see why they even sell them here. They simply do NOT work below about 40 degrees. Ground thermal units work but are much more expensive to install, and takes years to make up for the installation cost. Electric heat may just be the cheapest heat now that gas has taken the leap in price.WILDEBILL308 said:That doesn't look like it is very cost effective to spend energy to heat coils when the temperature is below where you can get enough heat for practical use.
Bill