Refrigeration Connections; Rules And Precautions; Shaping The Refrigeration Pipes - Fujitsu Waterstage WOYG160LJL Installation Manual

 Refrigeration connections
This appliance uses refrigerant R410A.
Comply with the legislation on handling of refrigerants.
►

Rules and precautions

Connections must be made on the same day
the installation is filled with gas (see para.
"Filling the installation with gas", page
• Minimum tools required
- Set of pressure gauges (Manifold) with hoses
exclusively designed for HFCs (Hydrofluorocarbons).
- Vacuum gauge with isolation valves.
- Vacuum pump specifically for HFCs (using a standard
vacuum pump is allowed if, and only if, it is fitted with
a non-return valve on the suction side).
- Flaring tool, Pipe-cutter, Deburring tool, Spanners.
- Certified refrigerant leak detector (sensitivity 5g/year).
Using tools that have been in contact with
HCFCs (R22 for example) or CFCs is prohibited.
The manufacturer declines any liability with
regard to the warranty if the above instructions
are not observed.
• Flared connections
Lubricating with mineral oil (for R12, R22)
is prohibited.
- Lubricate only with polyolester oil (POE). If POE is not
available, fit without lubrication
• Brazing the refrigeration circuit (if necessary)
- Silver brazing (40% minimum recommended).
- Brazing only with dry nitrogen internal flux.
• Other remarks
- After each maintenance operation on the refrigeration
circuit and before final connection, take care to put
the caps back in position to avoid any pollution of the
refrigeration circuit.
- To eliminate any filings getting into the pipes, use dry
nitrogen to avoid introducing any humidity that may
adversely affect the appliance's operation. In general,
take every precaution to avoid humidity penetrating
into the appliance.
- Proceed with thermal insulation of the gas and liquid
pipes to avoid any condensation. Use pipe insulators
resistant to temperatures over 90°C. In addition, if the
humidity level in areas where the refrigerant pipes are
installed is expected to exceed 70%, protect the pipes
with pipe insulators. Use an insulating material thicker
than 15mm if the humidity level reaches 70 ~ 80%,
and an insulating material thicker than 20mm if
the humidity exceeds 80%. If the recommended
thicknesses are not observed under the conditions
- 22 -
26).
Coat the flared surface
with POE refrigeration oil.
Do not use mineral oil.
described above, condensation will form on the
surface of the insulation material. Lastly, use insulating
sleeves whose thermal conductivity will be less than
or equal to 0.045 W/mK if the temperature is equal to
20°C. The insulation must be impermeable in order to
withstand the passage of vapour during the defrosting
cycles (glass wool is prohibited).
►

Shaping the refrigeration pipes

▼ Bending
The refrigeration pipes must be shaped only on a
bending machine or with a bending spring in order to
avoid any risk of crushing or breaking them.
Remove the insulation material from the section of
pipe to be bent.
Do not bend copper to an angle greater than 90°.
Never bend pipes more than 3 times in the
same place otherwise traces of fracturing may
appear (hardening of the metal).
▼ Creating the flarings
- Cut the pipe to an appropriate length with a pipe-cutter
without damaging it.
- Carefully deburr it, holding the pipe pointing downward
to avoid introducing filings into the pipe.
- Remove the flared connection nut situated on the
valve to be connected and slide the pipe into the nut.
- Proceed to flare it, letting the pipe protrude out of the
flaring tool's tube.
- After flaring, check the state of the working radius (L).
This must not present any scratches or signs of
fracturing. Also check the dimension (B).
Flaring tool
Pipe ø
L
9.52 (3/8") 2.5 to 2.7
15.88 (5/8") 2.9 to 3.1
fig. 17 - Flaring of the flared connections
Waterstage / Installation / 2011 - EN
B
Nut
L
flare
C
Pipe
Dimensions in mm
B / C
0
-0.4
13.2 22
19.7 29