-7- 55008386-05
ADDING REFRIGERANT
1.
After evacuating the indoor unit and interconnecting pipework, open the valves using a 4 or 5mm Allen key. The high and low side
pressures should equalise within a minute.
2.
Additional charge for all systems, including heat pumps, should be introduced with the system in the
AIR CONDITIONING MODE.
3.
If a manual HP cutout is fitted, ensure that the reset button is depressed.
4.
A random start delay of up to 1 minute occurs when mains is first applied. A 3 minute delay occurs between successive compressor
operations on all systems.
5.
Additional charge should be introduced through the Schrader valve on the indoor unit or the service port on the suction service valve
on the outdoor unit (see charging section below to calculate the weight).
6. MCU
outdoor units should have a speed appropriate to their expected operating ambient
.
7.
Ensure that the refrigerant being added is the same refrigerant that the system was factory charged with.
8.
Run the system for a few minutes to allow it to stabilize.
9.
System to be charged to fitted sight glass.
10. 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:
R134A: 140
– 145 psig (9.7 – 10 barg) at 32°C ambient temperature, 250 – 260 psig (17.2 – 17.9 barg) at 55°C
ambient temperature
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)
11. 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.
