REFCO Two-Way Manifolds - Manual (Page 3)

HVAC/R
Service Products
REFCO Manufacturing Ltd. Telefon +41 41 919 72 82
Industriestrasse 11 Telefax +41 41 919 72 83
CH-6285 Hitzkirch (Switzerland) [email protected] www.refco.ch
Use of manifold:
Preparing
Before use ensure that the temperature scales on the manifold gauges
match the refrigerants 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 atmos-
pheric 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.
Below the different types available:
BM2, STAR, JUMBO-STAR, SM2 ➞ lift plastic plug on lens
➞
screw on dial.
STAR, MK-2, M2 ➞ screw on top of gauge (outside –"12-o-clock")
After adjusting replace the lens or the plastic plug.
Connecting the manifold to a system
• Connect blue hose (4) ➞ compound side of system.
• Connect red hose (5) ➞ pressure side of system.
• Connect yellow hose (8) ➞ vacuum pump.
• Close both valves (6+7).
Evacuation of a system
• Turn on the vacuum pump
• Open both valves (6+7)
• Check pressure on compound gauge
• If vacuum reached close both valves (6+7)
Please note: The evacuation time may vary depending on the size of a
system. A minimal time span of 20 minutes must be observed to evac-
uate a small to middle size system.
Filling of a system after evacuation
• Keep all valves closed. Disconnect the yellow hose from the vacuum
pump and connect this hose to a refrigerant container.
• Open blue valve (compound side)
• Open valve on refrigerant container. The system is now being filled
with refrigerant. Check the correct quantity of refrigerant with a charg-
ing scale for example the REFCO REF-METER and observe the pressure
on the compound gauge. If the flow of refrigerant is too slow or insuf-
ficient the compressor of the unit can be turned on to speed up the
process. Ensure that you fill vapour refrigerant only. Filling with full liq-
uid may lead to damage of components of the system.
• If the correct filling quantity has been reached close all valves.
• After the filling process check the pressure on the pressure and com-
pound side of the unit. You may use the flare cap provided.