Rules And Precautions; Refrigeration Connections; Creating The Flarings - Fujitsu AOYA18LALL Installation And Operating Manual

Heat pump air/water split single service
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Heat pump, Split, single service

Refrigeration connections

2.6
F
This appliance uses refrigerant R410A.
Comply with the legislation for handling refrigeration
fluids.

Rules and precautions

2.6.1
After every intervention on the refrigeration circuit
and before final connection, take care to replace the
plugs in order to avoid any pollution from the
refrigeration circuit.
Tools
Set of manometers with hoses exclusively reserved
for HFCs (Hydrofluorocarbons).
Vacuum pump specially for HFCs.
Provision on using tools that have been in contact
with HCFCs (R22 for example) or CFCs.
Use of a traditional vacuum pump is authorized if,
and only if, it is fitted with a non-return valve on the
suction side.
The manufacturer declines any liability with regard to
the guarantee if the above instructions are not
observed.
Flared connections
F
Lubrication with mineral oil (for R12, R22) is
forbidden.
- Only lubricate with polyolester refrigeration oil
(POE). If POE is not available, fit without
lubrication.
B r a z i n g o n t h e r e f r i g e r a t i o n c i r c u i t ( i f
necessary)
- Silver brazing (40% minimum recommended).
- Brazing only under dry nitrogen internal flux.
To eliminate any filings in the pipes, use dry nitrogen
to avoid introducing any humidity that may
adversely affect the appliances operation. In
general, take every precaution to avoid humidity
penetrating into the appliance.
Proceed to insulate the gas and liquid pipes to avoid
any condensation.
Use insulating sleeves resistant to temperatures
over 120°C. In addition if the humidity level in the
areas where the refrigeration pipes pass risks
exceeding 70%, protect the pipes with insulating
sleeves. Use a sleeve thicker than 15mm if the
humidity reaches 80%, and a sleeve thicker than
2 0 m m i f t h e h u m i d i t y e x c e e d s 8 0 % . I f t h e
recommended thicknesses are not observed under
the conditions described above, condensation will
form on the surface of the insulation material. Lastly,
take care to use insulating sleeves whose thermal
conductivity is 0.045 W/mK or less when the
temperature is 20°C. The insulation must be
impermeable to resist the passage of steam during
the defrosting cycles (fibreglass wool is prohibited).
18
Flaring tool
Ø Hose
L
6,35 (1/4")
1,8
9,52 (3/8")
2,5
12,7 (1/2")
2,6
15,88 (5/8")
2,9
Figure 18 - Flaring for flare connections
Refrigeration connections
2.6.2
The outside unit must be connected to the hydraulic
m o d u l e w i t h c o p p e r p i p e s a n d c o n n e c t i o n s
(refrigeration quality), insulated separately.
Comply with the pipe diameters and the permitted
pipe lengths (figure 13).
T h e m i n i m u m l e n g t h o f t h e r e f r i g e r a t i o n
connections is 5m for correct operation.
The appliance will be excluded from guarantee if it is
used with refrigeration connections less than 5m
long.
Manipulate the pipes and take them through walls
with protective plugs in place.
If the distance between the outside unit and the
hydraulic module exceeds the length of the
maximum conduits indicated in the table, an
additional charge of R410A must be loaded.
The quantity of R410A added must be adapted to the
length of the refrigeration circuit in order to the heat
p u m p 's p e r f o r m a n c e w i t h o u t d a m a g i n g t h e
compressor (figure 23).

Creating the flarings

2.6.3
- Cut the pipe to an appropriate length with a
pipe-cutter without deforming it.
- Carefully deburr it, holding the pipe towards the
bottom to avoid introducing filings into the pipe.
- Remove the flared connection nut situated on the
valve to be connected and slip the pipe into the nut.
- Proceed to flare, letting the pipe overflow the flaring
tool.
- After flaring, check the condition of the working
radius (L). This must not show any scratch or trace
of any fracturing. Also check the dimension (B).
Installation and operating manual "1350-EN"
B
L
Flare
nut
C
Hose
Dimensions in mm
0
B
C
- 0,4
2
9,1
17
2,7
13,2
22
2,9
16,6
26
3,1
19,7
29

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