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• As temperature of indoor space moves closer to set
point compressor, indoor, and outdoor motors adjust
speeds to reduce rate of indoor temperature change
and avoid passing set point. As temperature of indoor
space moves farther from set point compressor, indoor,
and outdoor motors adjust to increase rate of indoor
temperature change and remain close to set point.
System tries to remain running, minimizing the number
of start / stop cycles. This provides the most uniform
space conditioning comfort levels and best overall
system efficiency.
• In Heating Mode reversing valve is de-energized, except
during defrost. When air handler calls for heating,
if compressor is not in ASCT, it will start softly then
increase in speed as necessary to balance indoor heating
load, while minimizing compressor starts and stops.
Actual compressor speed is based on room temperature
differential, indoor fan speed, and compressor rated
frequency parameters. Minimum compressor run
times and outdoor coil defrost are in place whenever
compressor runs in Heating Mode. Condenser mounted
Electronic Expansion valve (EXv) continuously adjusts
refrigerant flow to maintain 15ºF (8.3ºC) superheat at
compressor. Refrigerant vapor travels through large
diameter tube of line set to air handler where heat is
transferred into air. Once refrigerant is condensed, sub-
cooled liquid returns to condenser via small diameter
tube.
• As temperature of indoor space moves closer to set
point compressor, indoor, and outdoor motors adjust
speeds to reduce rate of indoor temperature change
and avoid passing set point. As temperature of indoor
space moves farther from set point compressor, indoor,
and outdoor motors adjust to increase rate of indoor
temperature change and remain close to set point. If
system has optional electric heat, and heat pump alone
(stage 1) can not reduce set point differential, optional
electric heat energizes (stage 2) of heat. System tries
to remain running, minimizing number of start / stop
cycles. Providing uniform space conditioning levels and
best overall system efficiency.
COnDenSeR OpeRATIOn
