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55908039-03
9.
HEAD PRESSURE CONTROL SAGINOMIYA (RGE
– ZIN4 – SH)
The head pressure controller is factory set to suit the refrigerant. It may be necessary to adjust this to suit site
conditions, to raise or lower the nominal head pressure.
a. With the system switched off, connect a high pressure gauge to the liquid line service valve.
b. Switch on the system, indoor fan set to high speed, and run for a few minutes to stabilise.
c. The head pressure should be approximately:
R407C: 275-280 psig (18.9-19.6barg)
to achieve this adjust the screw clockwise to increase pressure or
anticlockwise to decrease. Each ½ turn will alter the pressure by approx 5 psig (0.5 barg)
Min fan speed (0 rpm) and fan cut in pressure 200 psig (13.8 barg) are factory set and not adjustable.
NOTE:
The condenser fan may stop if the operating pressure drops below 200 psig (13.8 barg)
10. HEAD PRESSURE CONTROL ALCO (FSY-42S) & SAGINOMIYA (XGE-4C)
The head pressure controller is factory set to suit the refrigerant. It may be necessary to adjust this to suit site
conditions, to raise or lower the nominal head pressure.
ALCO (FSY-42S)
a. With the system switched off, connect a high pressure gauge to the liquid line service valve.
b.
Switch
on
the system, and
run
for a few
minutes to
stabilise.
c. The
head pressure
should be
approximately:
Min fan speed (0 rpm) and fan cut in pressure 200 psig (13.8 barg) are factory set and not adjustable.