Refco SM4 Mode D'emploi page 5

Changeable piston type valves ensure perfect sealing. Glycerine-oil filled gauges are
equipped with a safety pressure relief in case of a pressure build up inside the gauge
due to a defect. The hoses can be hooked up to the hose anchors on the side and at the
front of the t-style for storage. This protects the hoses against contamination or damage.
Use of manifold:
Preparing
Before use ensure that the temperature scales on the manifold gauges match the refri-
gerants used in the system.
Adjust the gauge with the zero adjusting screw to zero. Position of the hand may vary and
might not point to zero depending on the atmospheric pressure. Readjusting the gauge
might therefore be necessary before each use of the manifold. The zero adjusting screw
is positioned either at the top or through the front lens depending on the type of manifold.
The different types of available manifolds are:
BM4, SM4 ¨ lift plastic plug on lens ¨ screw on dial
M4, M4-DELUXE ¨ screw on top of gauge (outside –"12-o-clock")
After adjusting replace the lens or the plastic plug.
Connecting the manifold onto a refrigeration system
• Close all valves from the manifold (8, 9, 10, 11)
• Connect compound side (4) ¨ blue hose
• Connect pressure side (5) ¨ red hose
• Connect vacuum side (6) ¨ yellow hose (3/8") on vacuum pump
• Connect vacuum side (7) ¨ yellow hose (1/4") on refrigerant cylinder or can
• The side connection (X) is prepared for a vacuum gauge (vacuum gauges is not included)
Evacuation of a system
• Switch on vacuum pump
• Open all valves (8, 9, 10, + 11)
• Check vacuum shown on vacuum gauge if connected
• Close all valves (8, 9, 10 + 11) when the vacuum is reached
Please note: The time for the evacuation is different because it is depending
on the size of the system.
Filling of a system
• Remove the yellow hose from the vacuum pump and manifold (6)
• Open black valve (11)
• Open the valve on refrigerant cylinder or can
• Open blue valve (9)
• Fill the needed quantity of refrigerant from cylinder or can into the system. Check the
correct quantity of refrigerant with a charging scale like REFCO REF-METER-OCTA and
observe the pressure on the compound gauge. If the refrigerant flow into the system is
not sufficient, switch on the compressor of the cooling appliance.