Form O-Y P/N 273647R5, Page 17
Install sensor(s) to the top of the liquid line where the line exits the condenser coil
as shown below in sketch. A liquid line sensor will be required for each independent
refrigerant circuit. Both liquid line sensors will be connected to one head pressure
controller.
Installation of Liquid
Line Sensor(s)
Use Temperature to Resistance table shown below to verify proper sensor operation.
Temperature to
Resistance Table
3.6 Check
Refrigerant
Pressure and
Temperatures
(subcooling and
superheat)
Two important requirements before checking superheat and subcooling:
1)
This unit has fully intertwined refrigerant circuits and each circuit MUST be
isolated before measuring its temperature. Another active circuit will influence the
reading and make it impossible to determine accurate superheat and subcooling.
2)
If the circuit is equipped with an optional hot gas bypass valve, the valve must
be disabled before measuring superheat and subcooling. Locate the shutoff
valve. Disable the hot gas bypass valve by closing the shutoff valve. When
measurements are complete, be sure to open the valve.
The cooling system is charged and set at the factory to provide cooling as designed
and to meet the requirements of the application. The procedures below for checking
subcooling and superheat are not required under normal conditions and should only
be performed as a service function by a qualified technician.
DANGER
These refrigeration circuits are high pressure systems. Hazards exist that could
result in personal injury or death. Removal, installation, and service of this scroll
compressor must be performed by a technician qualified in R-410A refrigerant.
DO NOT USE service equipment or tools designed for R22 refrigerant. See Hazard
Levels, page 2.
