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Old 12-21-2010, 11:28 AM   #1
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TRANE HVAC running 24hrs/a day...?


I have a TRANE heat pump system:
Outdoor unit: XL1400 Model No: TWY036B100A0
Air Handler: TWE040E13FB0
The unit worked great in the summer keeping the place cool.
Right now its hi 35/lo 25 here in Maryland and the unit seems to run almost 24hrs a day just with temperature set to 65... Is that normal? The air that comes out of the vents is not really that warm either.
I did notice that one of the circuit breakers is OFF by the air handler. The breaker box has two large wires going to it, black and white. The breaker for the black wire is tripped. I'm guessing thats the "emergency heat" electric heater.
This is my first winter in this house (~2400sf). Could it be that the electric heater was turned off by previous owners? Does that make any sense as far as saving on heating costs? Is there anything I need to check before flipping that breaker back on?

Thank you,

Boris.

Just double checked and the breaker is TRIPPED not turned off.


Last edited by Borisw37; 12-21-2010 at 01:58 PM.
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Old 12-21-2010, 01:43 PM   #2
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TRANE HVAC running 24hrs/a day...?


Hi Boris,

Circuit breakers and heat strips are above me. I'm sure one of the HVAC pros will respond shortly.

I have a similar unit. Trane XL1200 with TWE040E13FB air handler, 3 Ton. I experience similar operation. A week ago I was only getting 13 degree temperature differential. Air temperature at the return was about 67 degrees and air temperature at the nearest air supply from the air handler was 80 degrees.

Sure didn't feel like warm air, but I'm told that is how a heat pump works. At 80 degrees it will warm the house to the thermostat set point, it will just take a long time.

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Old 12-21-2010, 03:48 PM   #3
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TRANE HVAC running 24hrs/a day...?


With resistance or fossil fuel, indoor temperature doesn't really affect capacity, but it does with heat pump. For maximum capacity you want the temperature difference as little as possible from ambient.

With 25F outdoor and 65F indoor, the 36,000 BTU cooling rated heat pump is only capable of about 24,000 BTU heating using something like 2.2kW. If it's really running 24/7, you're looking at about 50kWh/day.

In comparison, when they install gas furnace, they make it much more powerful, like 60,000(@80% 48,000) to 80,000(@80% 64,000)


Your COP is close to 3, so if its keeping up, its best to keep resistive back-up off until it just can not keep up.

The tripping breaker maybe because the backup heater kW exceeds the capacity of the circuit. If you plan on using backup, get it checked out.
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