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Posted by jamesgangnc on November 10, 2009, 9:40 am
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> I have a LENNOX heatpump with a newer replacement RHEEM outside unit,
> due to a gas leak at the coils of the original LENNOX unit. =A0 It works
> fine in AC mode, but when it switches to heat, the compressor gets VERY
> hot over time, and the accumulator starts frosting up from the bottom
> up. =A0 It's a dual fuel, and I switched it over to gas, and the icing
> leared up almost instantly. =A0 In heatpump "heat" mode, the air at the
> registers is only about 75deg. =A0 I'll have to switch it back to heatpum=
> mode to see ig that's happening all the time, or just when the
> compressor is heating up.
> I'm thinking the defrost board might be wacky, but not sure .. .. anyone
> got opinions ?? =A0
What's your location?
It's not clear to me exactly what you have. A heat pump is primarily
the outside unit. The A coil inside is very similar between a heat
pump and a straight ac. Some use the same A coil for both. You said
a leak in the coil, do you mean the outside coil or the inside coil?
You now have a rheem heat pump outside? Was the A coil inside repaced
with a rheem unit as well? When did this happen? Have you had a
successful winter season with the combination of equipment you have
now? Or did this replacement happen last summer? It's ok to mix the
inside air handler or one brand with the ac/heat pump of another
brand. Not so good to mix inside A coil of one brand with outside
unit of another brand.
It could be low on refrigerant. Slightly low refridgerant sometimes
causes a unit to actually be colder initially but have freezing
problems.
It might be the defrost cycle first. Have you seen it start the
defrost cycle? There are several ways this happens, it can be a
simple timer circuit or there is a sensor that triggers the defrost
cycle. Most of the boards have a test point that can be used to force
a defrost. Look for that. If you can trip it watch to see that the
flow reverses and the outside fan stops running. If you can't force
it then you have to watch it a while.
Be careful, serious electricity and high pressure gas. If you are not
comfortable with these then call the guy.
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> due to a gas leak at the coils of the original LENNOX unit. =A0 It works
> fine in AC mode, but when it switches to heat, the compressor gets VERY
> hot over time, and the accumulator starts frosting up from the bottom
> up. =A0 It's a dual fuel, and I switched it over to gas, and the icing
> leared up almost instantly. =A0 In heatpump "heat" mode, the air at the
> registers is only about 75deg. =A0 I'll have to switch it back to heatpum=
> mode to see ig that's happening all the time, or just when the
> compressor is heating up.
> I'm thinking the defrost board might be wacky, but not sure .. .. anyone
> got opinions ?? =A0