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I have a 3 ton Coleman heat and air pump and when I turn the air condition on the heat strip comes on at the same time

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If you are calling for heat and the thermostat is set for 2 degrees higher than room temp, the heat pump and strips come on.
When the room temp and stat temp are less than 2 degrees the strips turn off.
That is, unless the installer wired the t-stat for the strips to stay on.
If they are coming on in the air/cool mode then you have a bad heat relay or a t-stat wire shorted.

Posted on Mar 11, 2009

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SOURCE: when I turn the air on the heat strips comes on at the same time

Is this a central heat? From the size i assume it is.
You say air conditioning on part of your question then use heat pump on another part. So it is important for us both be on the same page.
With all due respect some people think they have a heat pump and it is just AC and electric heat also but is not a heat pump.
. If you have the outdoor AC unit running with your thermostat set for heat and the air coming off the out door unit is cold, or you see it "steam up outdoors" off the out door unit at times (we call this mode defrost).

If you actually have a Heat pump system some times it is wired to have the strips come on at the same time the heat pump comes on especially if you experience a lot of weather below 40' occasionally and have an emergency heat setting on your thermostat you most likely have a heat pump.

If you have a heat pump for sure now the heaters can come on with the outdoor section if
1 they are wired to do so or
2 the thermostat has 2 stage heating and the second stage is telling the elements to come on, or
3 the outdoor thermostat (if so equipped) is telling the elements to come on.
Any 1 or combination of these 3 items can cause the elements to come on wit the out door unit.

Posted on Mar 12, 2009

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Confirm the current indoor temperature. Turn the thermostat up one degree at a time until it comes on. This will typically be 1 to 4 degrees increase. As soon as it comes on stop increasing the temp.

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Check the temperature coming our of the vents at that time. You should have 30 to 60 degrees increase from the air temp going into the unit and the conditioned air temp coming out.

Then turn the T-stat up another 10 degrees. If the temp coming out of the vents increases by 20 degrees or more. the strips are on.

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You could also take the panels off the unit and look for a reversing valve, but unless you know what you are looking for you will not recognise it.

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When I turn the air on the heat strips comes on at the same time


Is this a central heat? From the size i assume it is.
You say air conditioning on part of your question then use heat pump on another part. So it is important for us both be on the same page.
With all due respect some people think they have a heat pump and it is just AC and electric heat also but is not a heat pump.
. If you have the outdoor AC unit running with your thermostat set for heat and the air coming off the out door unit is cold, or you see it "steam up outdoors" off the out door unit at times (we call this mode defrost).

If you actually have a Heat pump system some times it is wired to have the strips come on at the same time the heat pump comes on especially if you experience a lot of weather below 40' occasionally and have an emergency heat setting on your thermostat you most likely have a heat pump.

If you have a heat pump for sure now the heaters can come on with the outdoor section if
1 they are wired to do so or
2 the thermostat has 2 stage heating and the second stage is telling the elements to come on, or
3 the outdoor thermostat (if so equipped) is telling the elements to come on.
Any 1 or combination of these 3 items can cause the elements to come on wit the out door unit.

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