Thermostat: cycles per hour


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Old 12-31-19, 04:13 AM
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Thermostat: cycles per hour

Hello, why would a home owner want more cycles per hour (CPH) versus less for their heating system?

FYI I have a gas fired forced air heat/cooling system with a Honeywell thermostat.

I see more advantages to less cycles per hour involving humidity control and general comfort.

When would more CPH be better than less?

Thank You
JOB
 
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Old 01-01-20, 02:04 AM
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The Honeywell manual gives a description for cycles per hour.


Cycle rate limits the maximum number of times
the system can cycle in a 1 hour period measured
at a 50% load. For example, when set to 3 CPH, at
a 50% load, the most the system will cycle is 3
times per hour (10 minutes on, 10 minutes off).
The system cycles less often when load conditions
are less than or greater than a 50% load. The
recommended cycle rate settings are below for
each heating equipment type:
Standard Efficiency Gas Forced Air = 5 CPH
High Efficiency Gas Forced Air = 3 CPH
Oil Forced Air = 5 CPH
Electric Forced Air = 9 CPH
Hot Water Fan Coil = 3 CPH
Hot Water Radiant Heat = 3 CPH
Geothermal Radiant Heat = 3 CPH
Steam = 1 CPH
Gravity = 1 CPH
 
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Old 01-01-20, 08:38 AM
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My opinion......

Pro.... more cycles per hour allow for a more constant overall temperature.
Con... more cycle per hour is harder on the equipment.
 
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Old 01-01-20, 08:48 AM
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Thanks Houston for the response, when in doubt stick to the owner manual.

Thanks PJ for the input well said

JOB
 
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Old 01-01-20, 08:57 AM
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Usually at 50% load you will rarely see the CPH come into play IMO. I have heat pump and have mine set for 2. Why they would recommend 9 is beyond me..

I want long run times

But temperature will always over ride CPH
 
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Old 01-01-20, 06:05 PM
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Thanks Larosa I have a new Honeywell after 23 years

The stat still reads the same temperature as the old one and the CPH was set the same as the old unit.

My run times are longer and my 2nd floor is now warmer then it ever was for the past 23 years.

Go figure!
JOB
 
 

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