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Home Repair - - If it ain't broken, don't fix it. Otherwise look here.
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Posted by =?ISO-8859-1?Q?=22=3C=3C=3C=5F on November 8, 2009, 10:26 am
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. 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. It's a dual fuel, and I switched it over to gas, and the icing
leared up almost instantly. In heatpump "heat" mode, the air at the
registers is only about 75deg. I'll have to switch it back to heatpump
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 ??
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Posted by DanG on November 10, 2009, 7:56 am
Bob, air to air heat pumps only work well to about 50 degrees.
They are prone to icing - nature of the beast. It will be more
cost efficient to use the heating coils if all electric or other
alternate fuel.
--
______________________________
Keep the whole world singing . . . .
DanG (remove the sevens)
dgriff237@7cox.net
show/hide quoted text
>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.
>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. It's a dual fuel, and I
>switched it over to gas, and the icing leared up almost
>instantly. In heatpump "heat" mode, the air at the registers is
>only about 75deg. I'll have to switch it back to heatpump 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 ??
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Posted by jamesgangnc on November 10, 2009, 9:30 am
> Bob, air to air heat pumps only work well to about 50 degrees.
> They are prone to icing - nature of the beast. =A0It will be more
> cost efficient to use the heating coils if all electric or other
> alternate fuel.
That's just crap, modern heat pumps work fine far lower than that.
Certainly more effeciently that electric resistance. Gas back up will
be more economical at a higher point.
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Posted by Red Green on November 10, 2009, 10:48 am
show/hide quoted text
> Bob, air to air heat pumps only work well to about 50 degrees.
> They are prone to icing - nature of the beast. It will be more
> cost efficient to use the heating coils if all electric or other
> alternate fuel.
>
50 degrees?
Not buying that one. I had an old clunker that worked fine at 32. Worked
good below that as well but being a clunker the efficiency dropped more
rapid.
Then there was another old one, not as old, that went into a defrost cycle
for a few minutes if icing occured.
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Posted by JIMMIE on November 10, 2009, 8:50 am
show/hide quoted text
> 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
My Lennox automatically switches to gas when the outside temp get s
down to a preset level. You can set this level in your thermostat.
Recommended level is 45F. This may be setup wrong or doesnt work with
the RHEEM unit.
Jimmie
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>unit, due to a gas leak at the coils of the original LENNOX unit.
>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. It's a dual fuel, and I
>switched it over to gas, and the icing leared up almost
>instantly. In heatpump "heat" mode, the air at the registers is
>only about 75deg. I'll have to switch it back to heatpump 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 ??