1. CREATING A VACUUM AND TOPPING UP THE REFRIGERANT GAS CHARGE
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.
Leak Detector.
1
2
3
LOW
HIGH
VAC
REF
7 8
9 10
1
2
3
4
5
6
11
BLUE
RED
YELLOW
KEY
:
1. LP pressure gauge
2. HP pressure gauge
3. LP valve marked “LOW”
4. HP valve marked “HIGH”
5. Valve connected to the vacuum pump marked
“VAC”
6. Refrigerant valve marked “REF”
7. Attachment for connecting the hose to the LP side
8. Attachment for connecting the hose to the vacuum
pump
9. Attachment for connecting the hose for the
refrigerant
10. Attachment for connecting the hose to the HP side
11. Vacuum gauge
12. Leak detector
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 valve marked “LOW” (Blue hose).
2
VAC
5
Connect the hose to the vacuum pump and to the inlet on the pressure gauge unit,
shut off using the yellow valve marked “VAC” (Yellow hose).
3
HIGH
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 valve marked “High”. The other connection on the detector which is not
connected should be kept closed.
4
-
DISCONNECTING THE UNIT FROM THE POWER SUPPLY; Ensure that the condensing
and evaporation units are not connected to the power supply (check carefully).
5
CHECKING THAT THE VALVES ARE SHUT OFF ON THE OUTDOOR UNIT; Ensure that the
shut-off valves (brass) on the outdoor unit are completely closed (carefully check the
valves with a suitable Allen key).
CREATING A VACUUM AND TOPPING UP THE REFRIGERANT GAS CHARGE
31
Summary of Contents for SGE250
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Page 17: ...17 TECHNICAL DIMENSIONS SGE250 SGE350 SGE500 mm mm ...
Page 18: ...18 SGE700 mm ...
Page 29: ...Fig A Fig C Fig E Fig B Fig D Fig F 29 ...
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