7.
Tighten the connections using a wrench and torque
wrench according to the tightening torque values
in the table.
Tightening torquePipe diameter
Approx. 15 – 20 Nm6.35 mm (1/4")
Approx. 30 – 40 Nm9.52 mm (3/8")
Approx. 50 – 55 Nm12.7 mm (1/2")
8.
Insulate the pipes thoroughly and keep the pipe
connections free for leak testing.
Before vacuuming, leak trace the system. Fill with
nitrogen to approx. 3 bar. Leak trace all connections
using leak spray (soapy water) to ensure that the
system is sealed.
9.
For vacuuming of the indoor unit and refrigerant
pipe, connect the vacuum pump to the outdoor unit
as illustrated.
NOTE
Remaining air or damp affects the heat
pump's function negatively and can damage
the product.
10.
Remove the valve caps from both valves. Now start
the vacuum pump. If damp air has entered the
cooling pipes, flush through with dry nitrogen.
11.
With the vacuum pump in operation, close the tap
on the manometer unit when you have reached a
vacuum less than 2 mbar (absolute pressure, stand-
ing vacuum min. 30 minutes). Stop the vacuum
pump.
AG-AC10Chapter 5 | Installation16
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