29
JOHNSON CONTROLS
FORM 150.68-ICOM1
ISSUE DATE: 10/15/2020
Suction Superheat: Check suction superheat at steady
full system load only. It is important that no bubbles
appear in the liquid line sight glass. Measure suction
temperature on the copper line about 150 mm before the
compressor inlet connection. Measure suction pressure
at the compressor pressure transducer gauge connection
port. Superheat should be 9ºF to 12ºF.
Expansion valve adjustment: The expansion valves
are factory set and should not need adjustment.
Subcooling: Check liquid subcooling at steady full
compressor load only. Measure liquid line temperature
on the copper line beside the main liquid line service
valve. Measure liquid pressure at the liquid line service
valve. Subcooling should be 9ºF to 14ºF. If subcooling
is out of range add or remove refrigerant as required.
Do not overcharge the unit.
General Operation: After completion of the above
checks for System 1, repeat the process for System 2.
In addition, check that loading occurs as specied in
the Technical Data Section and that general operation
is correct.
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