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54208003-13
4.
If a manual HP cutout is fitted, ensure that the reset button is depressed.
5.
Additional refrigerant and polyolester oil should be introduced through the Schrader valve on the indoor
unit, or the service port on the suction service valve on the outdoor unit.
Ensure the refrigerant is the
correct type, as shown on the rating plate
. R407C must always be added in the liquid state.
6.
Run the system for a few minutes to allow it to stabilize. Where possible, charge to a sweat line on the
evaporator. Typical suction pressures on short lines at UK conditions, with high speed evaporator fan,
high speed condenser fan, should be; electromechanical comfort system approx 4.4 bar (65 psig);
electronic comfort system approx 3.8 bar (55 psig); heat pump system approx (58 psig).
Systems
should not be overcharged, to avoid liquid return to the compressor
.
7.
DCU+/DHPUL: 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)
8. DCU+/DHPUL: HEAD PRESSURE CONTROL ALCO (FSY-42S)
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.