18
1
2
3
LOW
HIGH
VAC
REF
7
8
9
10
1
2
3
4
5
6
11
The fitter must be equipped with:
• A vacuum pump for chiller systems, ideally a two-stage pump, equipped with a non-return valve in the event
of a power cut or if the pump is switched off.
• A suitable pressure gauge unit for the refrigerant gas added to the system being operated on.
• Pipes for connecting the pressure gauge unit to the cooling circuit on the unit, equipped with valves to shut
off the flow of refrigerant gas.
• A vacuum gauge with a needle or an electronic gauge (recommended) to check the vacuum level.
• Digital thermometer.
Key:
1. LP pressure gauge
2. HP pressure gauge
3. LP cock marked “LOW”
4. HP cock marked “HIGH”
5. cock connected to the vacuum pump marked
“VAC”
6. refrigerant cock marked “REF”
7. attachment for connecting the hose to the LP
side
8. attachment for connecting the hose to the vac-
uum pump
9. attachment for connecting the hose for the re-
frigerant
10. attachment for connecting the hose to the HP
side
11. Vacuum gauge
VAC
5
HIGH
BLUE
RED
YELLOW
10.8. CREATING A VACUUM AND TOPPING UP THE REFRIGERANT GAS CHARGE
1
CONNECTING THE LOW PRESSURE HOSE AND CREATING THE VACUUM; Using the service
socket (split-systems normally have a single socket), connect the hose to the service
connection on the outdoor unit and to the inlet on the pressure gauge unit, shut off
using the blue cock marked “LOW” (Blue hose).
Connect the hose to the vacuum pump and to the inlet on the pressure gauge unit,
shut off using the yellow cock marked “VAC” (Yellow hose).
2
CONNECTING THE VACUUM GAUGE; If using an electronic vacuum gauge to measure
the correct vacuum level, connect the connection on this to one of the hoses not used
on the pressure gauge unit, for example to the red HP hose, shut off using the red cock
marked “High”. The other connection on the detector which is not connected should
be kept closed.
3
DISCONNECTING THE UNIT FROM THE POWER SUPPLY; Ensure that the condensing and
evaporation units are not connected to the power supply (check carefully).
4
1
2
3
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