Heat pumps are two systems in one – Honeywell CT8611 User Manual
Page 4
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HEAT PUMPS ARE DIFFERENT
HEAT PUMPS ARE TWO SYSTEMS IN ONE
• Heat pun>p systems usually
have a supplemental,
“second stage" heating
system that operates only
when necessary. This heat
pump thermostat is designed
to minimize more expensive
second-stage operation,
indicated by the green AUX
light on your switching
subbase.
• With this thermostat, you will notice that your compressor
operates continuously during the recovery period. This may
appear to waste energy, but actually is more efficient.
Multiple ON-OFF cycles are neither necessary to achieve
comfort, nor are they as efficient for heat pump systems. By
reducing the number of cycles, you reduce the strain on
your system and extend equipment life.
MILD WEATHER
INDOORS
■ AUXILIARY
HEATING
ELEMENT
OFF
INDOOR
AIR
In mild westher, virtuafiy all of the demand for heat in buildings
can be met by the heat pump compressor. This "First Stage"
process o\ moving heat indoors is very economical. As the
air becomes colder outside, the first stage may be unabfe to
deliver enough heat to maintain the desired comfort /evef
m the buiiding.
SEVERE WEATHER
OLrnKWRS
INDOORS
AUXILIARY
> HEATING
EUCMCNT
ON
i
INDOOR
t AIR
During high heat demand, the thermostat wiU call for additiorm!
“Second Stage"power from the auxiliary heat system. This
auxiliary tieat is commonty electric “resistance" heat and is two
to three times more expensive to operate than the compressor.
If you have specific questions concerning the the operation of
your heat pump, please contact the equipment manufacturer.