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Components
7.0 COMPONENTS & CONTROLS
7.1 Accumulator
All (-)P20 EcoNet™ enabled variable speed heat
pumps are equipped with an accumulator for
the purpose of managing possible refrigerant
flood back issues that may occur at abnormal
environmental conditions.
7.2 Choke/Inductor
For each power inverter used in the (-)P20 system
there is a paired choke/inductor. The choke
is designed as a low pass filter and increase
inductance. By doing this the input power can
be more efficiently used by the inverter and
compressor.
7.3 Coil Temperature
Thermistor
The EcoNet™ enabled (-)P20 variable speed
heat pumps are equipped with a coil sensor that
is used for the purposes of identifying defrost
parameters and low ambient cooling operational
conditions. This thermistor is provided with the
suction line thermistor as a single harness.
7.4 Discharge Line
Thermistor
(-)P20 heat pumps are equipped with a discharge
line thermistor that is used to measure the
compressor discharge temperature. This sensor's
leads connect directly to the inverter which
communicates with the Variable Speed Outdoor
Control (VSODC). The compressor discharge
temperature is continuously monitored by the
controls. The compressor speed is reduced
as needed to prevent excessive discharge
temperatures that would damage the compressor
under extreme environmental conditions. As the
discharge temperature returns to an acceptable
level, the controls will gradually increase the
compressor speed in an attempt to meet the
capacity demand as long as the discharge
temperature remains at a safe level.
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