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7.0 COMPONENTS & CONTROLS
(-)P20 heat pumps are equipped with a suction pressure transducer for the
purpose of measuring the suction pressure between the reversing valve
and the accumulator. The output of this device is a 0.5 – 4.5VDC signal
that the VSODC converts to a pressure used in calculating the heating
mode suction superheat. The measured suction superheat is used for
controlling the position of the outdoor EXV to maintain the correct heating
mode superheat level. The VSODC communicates the suction pressure
and heating mode superheat level to the EcoNet™ Control Center where
they are displayed on outdoor unit status screen
.
(-)P20 heat pumps are equipped with a suction line
thermistor for the purposes of measuring suction
gas temperature during the heating mode. The
measured temperature is paired with the saturated
suction temperature and used by the VSODC to
calculate superheat and adjust the outdoor EXV to
maintain the correct superheat level.
IMPORTANT:
The clamp on the suction
line thermistor securely attaches to the alternate
suction line at the 10 to 2 o’clock position with a
corrosion resistant stainless steel clip. Insulation is
factory installed over the suction line thermistor and
suction line. This thermistor is provided with the coil
thermistor as a single harness.
7.15 Suction Pressure Transducer
7.16 Suction Temperature Thermistor
Thermister Location
Components
meet the capacity demand as long as the operat-
ing conditions remain within the safe operating
range of the compressor and inverter.
1. High voltage input (L1 – Black; L2 – Yellow)
2. Ground connection
3. Choke Connection
4. High Pressure control connection (HPS) – with
automatic reset
5. Discharge line thermistor connection (Sensor)
6. Modbus communication connections (RS485)
7. Compressor connections (W-Black; V-Red;
U-Yellow)
