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Old 12-30-2009, 07:34 AM   #16
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Which honeywell thermostat should I buy for my Carrier heat pump?


To an extent yes.

The CPH is only accurate at 50% load(50% of your systems capacity to heat or cool the house). As it gets colder or hotter out.
It will do more or less cycles.

CPH is both a timing and temp difference algorithm(but not a lot of temp difference swing).

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Old 12-30-2009, 07:41 AM   #17
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Which honeywell thermostat should I buy for my Carrier heat pump?


Off the top of my head I cannot remember what it is set at, but I am quite sure I left them at the default setting which is 5-5, 6-5, 8-9, 9-3, 10-3 (there is no 7).
5 is heat cycle rate
6 is second heat cycle rate/aux heat
8 is emergency heat cycle rate
9 is compressor cycle rate
10 is second stage compressor cycle rate
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Old 12-30-2009, 08:10 AM   #18
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Which honeywell thermostat should I buy for my Carrier heat pump?


Oooops, 7 is only on the 5320 model.

5 CPH is too many for a heat pump. Waste a lot of electric. Takes too long for a compressor to get to its full efficiency.

You'll find better efficiency at 3 CPH of all heat and cool CPH on a heat pump.
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Old 12-30-2009, 08:33 AM   #19
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Which honeywell thermostat should I buy for my Carrier heat pump?


OK, that makes sense. I'll switch all those down to 3.
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Old 01-29-2010, 07:12 PM   #20
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Which honeywell thermostat should I buy for my Carrier heat pump?


I wasn't able to change from the default settings until last week because the house is out of state. Those default cycle rate settings managed to get me a $120 electric bill. The previous month was $20.

Another question I had was how come the manual says the heat cycle rate should be 9 for electric furnaces, emergency heat, and second stage heat/aux heat? Is a heat pump considered an "electric furnace"?

Also, what would happen if I changed the heat cycle rate from 3 to 2?

Last edited by mannypp; 01-29-2010 at 08:32 PM.
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Old 01-29-2010, 10:51 PM   #21
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Which honeywell thermostat should I buy for my Carrier heat pump?


The aux and emergency setting of 9 is for comfort. Which is ok, if you don't mind the annoyance of 3 minutes on and 3 minutes off. Which at outdoor temps just below your heat pumps thermal balance point. Will keep the heat pump running 24/7.

Setting to 3 allows the heat pump to shut off when its just below your balance point temp outside. Which could be 35 degrees.

Setting the heat pump to 2 instead of 3 makes it run slightly longer. And can bring on the aux heat quicker.
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Old 01-30-2010, 06:28 AM   #22
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Which honeywell thermostat should I buy for my Carrier heat pump?


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The aux and emergency setting of 9 is for comfort. Which is ok, if you don't mind the annoyance of 3 minutes on and 3 minutes off. Which at outdoor temps just below your heat pumps thermal balance point. Will keep the heat pump running 24/7.

Setting to 3 allows the heat pump to shut off when its just below your balance point temp outside. Which could be 35 degrees.

Setting the heat pump to 2 instead of 3 makes it run slightly longer. And can bring on the aux heat quicker.
It seems that running 3 mins on and 3 mins off would cause the electric bill to be very high (which is what happened last month when the cycle rate was set to 5). And I definitely don't want the heat pump running 24/7.

Can you explain what balance point is?
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Old 01-30-2010, 06:35 AM   #23
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Which honeywell thermostat should I buy for my Carrier heat pump?


Balance point.

There are 2.
1. The outdoor temp at which the heat pump can no longer maintain the set indoor temp.
2. The outdoor temp at which point it cost more to use the heat pump then the aux heat source.


There is really nothing wrong with a heat pump running 24/7. They are designed for that. But, many people just don't like it.

Often, it cost less to run the heat pump 24/7. Then for the heat pump to run for 10 hours and the aux heat to also come on for 4 of those 10 hours.
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Old 01-30-2010, 06:55 AM   #24
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Which honeywell thermostat should I buy for my Carrier heat pump?


Makes sense. I think that the combination of the heat cycle settings set above 3 and the fact that the temps last month were in the high 20's at night and high 30s during the day for a week or two caused the $120 bill. I had the heat set to 60 while I was not there. The heat pump is in South Carolina on the coast. In the winter months, the temp tends to be in the 50's during the day and 40's during the night. I bet what was happening was that the aux heat (heat strips) in the air handler were on quite a bit during those cold days and using a lot of power.

In the install manual for the tstat, for the cycle rates, it refers to an "electric furnace" and the cycle rate of 9. Is a heat pump considered an electric furnace? I'm thinking not because that is counter to your recommendation of 3 for all the cycle rates.
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Old 01-30-2010, 07:02 AM   #25
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Which honeywell thermostat should I buy for my Carrier heat pump?


An electric furnace is an air handler with strip heaters(in your case your aux heaters).


Even on electric furnaces(no heat pump attached). I don't set the CPH to 9. It also cycles the blower motor with the heaters. And that waste a lot of electric starting that motor back up every 6 minutes.

I set the CPH to 3. And people like that MUCH better. Then 9CPH.
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Old 01-30-2010, 07:08 AM   #26
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Which honeywell thermostat should I buy for my Carrier heat pump?


Great. I just want to validate the settings. The aux heat cycle rate set to 9 was probably causing the heat strips in the air handler to go on and off alot and wasting alot of electric.
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Old 01-30-2010, 09:44 AM   #27
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Which honeywell thermostat should I buy for my Carrier heat pump?


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Originally Posted by mannypp View Post
Great. I just want to validate the settings. The aux heat cycle rate set to 9 was probably causing the heat strips in the air handler to go on and off alot and wasting alot of electric.
A 9 setting does waste electric.
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Old 01-30-2010, 10:03 AM   #28
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Which honeywell thermostat should I buy for my Carrier heat pump?


Now that I have come full circle on all this, I realize that the same heat strips in the air handler are used for Aux heat and Emergency heat. That is why there is a jumper between E and Aux (Y2 and W2) in the thermostat. The heat pump itself is only a single stage system, the heat strips in the air handler provide the Aux heat. The Aux heat is the second stage and the thermostat is configured for a 2H/1C system.

With the combination of the very cold weather and the aux heat cycle rate set to 9 was most likely the reason for the high electric bill. I changed the setting on the thermostat to 3 right at the end of the last billing cycle, so we will see the result of these changes at the end of Feb when I get the next bill.
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Old 01-30-2010, 01:55 PM   #29
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Which honeywell thermostat should I buy for my Carrier heat pump?


The only thing that might be a bit fishy about the thermostat wiring is that the E and Aux are jumpered together. The white wire coming out of the wall which I assume is the second stage heat circuit is connected to Aux (W2) and then there is a jumper between Aux (W2) and E (Y2). Does this seem correct to you? Should I expect a black wire to be connected to E (Y2)? The previous thermostat did not have a black wire connected to it. It had the same setup, Aux and E had a jumper between them and connected to the white (second stage heat) wire.
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Old 01-30-2010, 02:21 PM   #30
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Which honeywell thermostat should I buy for my Carrier heat pump?


Nope. Thats pretty much standard wiring for many heat pumps where the aux and emergency heat is the same strip heater package.

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