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REMKO WKF / WKF-compact
Fig. 80: Tighten fittings
1: Tighten 1st Spanner
2: Counter 2nd Spanner
Copper piping Out-
side diameter
3/8" = 9,52 mm
5/8" = 15,88 mm
n
The installed refrigerant pipes, including the
flare connections, must be provided with suit-
able insulation.
n
Special measures need not be taken for the
return of the compressor oil.
NOTICE!
Use only tools which are approved for use in
an HVAC environment. (z. B.: bending pliers,
pipe/tubing cutters, de-burrers and flaring
tools). Do not cut refrigerant pipes with a saw.
NOTICE!
All work must be carried out in a way that pre-
vents dirt, particles, water etc. from entering,
refrigerant lines!
72
1
2
Tightening torque
32 - 40 Nm
65 - 75 Nm
Outdoor units may be delivered with nuts suit-
able for joining flanges.
9.2 Commissioning the
refrigeration system
Leak testing
Once all the connections have been made, the
pressure gauge station is attached to the Schrader
valve as follows (if fitted):
blue = large valve = suction pressure
Once the connection has been made successfully,
the leak test is carried out with dry nitrogen. The
leak test involves spraying a leak detection spray
onto the connections. If bubbles are visible, the
connections have not been made properly. In that
case, tighten the connection or, if necessary,
create a new flange.
Pumping down to vacuum
After completing a successful leak test, the excess
pressure in the refrigerant pipes is removed and a
vacuum pump with an absolute final partial pres-
sure of min. 10 mbar is used to remove all of the
air and empty the pipes. Any moisture present in
the pipes will also be removed.
NOTICE!
A vacuum of at least 10 mbar must be pro-
duced!
The time required to generate the vacuum is
dependent on the final pressure pipe volume of the
indoor units and the length of the refrigerant pipes.
This always takes at least 60 minutes. Once any
foreign gases and humidity have been completely
extracted from the system, the valves on the pres-
sure gauge station are closed and the valves on
the outdoor component are opened as described in
the "Commissioning" section.
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