Airwell PAC BT Series, Installation And Operating Manual

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4 - REFRIGERATING CONNECTIONS
Use only copper pipes for refrigeration, specifications for
R410A
Pipes must be clean.
On vertical sections ensure the presence of siphons every six
metres of unevenness on the delivery/suction line only.
Plug the ends of the pipe prior to passing it through a hole in
the wall (
1
).
Do not place the ends of pipes which have not been plugged
or closed with tape directly on the ground (
2
).
4.1 - DUCTING
Equivalent length of the lines (metres ) = Effective length
(metres) + (Q.ty of curves x K)
Consider K=
0.3
m for wide radius 90° curves;
Consider K=
0.5
m for standard 90° elbow curves
1 2
If the installation of the pipes is not to be completed within the
next day or for a long period of time, braze the ends of the
pipes and introduce nitrogen oxide via a Schrader valve
access joint to avoid the formation of humidity and the
contamination of the particles.
PRESSURE EQUIPMENT DIRECTIVE (97/23/EC)
It is an installer responsability :

follow the PED Directive and to the national regulations of
PED Directive realization

consider the insertion of any additional security devices

check the safety device operation

write on the serial label number the amount of total
refrigerant

issue the Declaration of conformity

inform the user of the need to carry out regular checks
Indoor unit
The indoor unit shipped with a nitrogen charge of about 1 bar.
If it is discharged, test the leaks also before the connections.
Before attaching the ducting to the two units, clean with dry air
or nitrogen.
Type of pipes
Size 5kW 7kW 9kW 12kW 14kW 17kW
Liquid Ø outdoor 3/8” 3/8” 3/8” 3/8” 1/2” 1/2”
Gas Ø outdoor 3/8” 1/2” 1/2” 5/8” 5/8” 3/4”
Min. thickness
gas
0,8 mm
1,0
mm
Min. thickness
liquid
0,8 mm
A max 25 m equivalent length of the pipe lines
B max 15 m height difference
C 6 m 6 m back up → siphon (gas line)