Table of Contents
Advertisement
Air to Water Heat Pump split system
3 Refrigerant gas connection
and filling the installation with gas
" This appliance uses refrigerant R410A.
Comply with the legislation for handling refrigerants.
3 .1
Rules and precautions
" Connections must be made the day of the filling
the installation with gas
• Minimum necessary tools
- Set of manometers (Manifold) with hoses exclusively
reserved for HFCs (Hydrofluorocarbons).
- Vacuum gauge whith isolation valves.
- Vacuum pump specially for HFCs (use of a traditional
vacuum pump is authorized if, and only if, it is fitted
with a non-return valve on the suction side).
- Flaring tool, Pipe-cutter, Deburring tool, Wrenches.
- Refrigerant gas leak detector certified (sensitivity 5g/year).
" Provision on using tools that have been in
contact with HCFCs (R22 for example) or CFCs.
" The manufacturer declines any liability with
regard to the guarantee if the above instructions
are not observed .
• Flared connections
" Lubrication with mineral oil (for R12, R22)
is forbidden .
- Only lubricate with polyolester refrigerant oil (POE). If
POE is not available, fit without lubrication.
• Brazing on the refrigerant circuit (if necessary)
- Silver brazing (40% minimum recommended).
- Brazing only under dry nitrogen internal flux.
• Remarks
- After every intervention on the refrigerant circuit and
before final connection, take care to replace the plugs in
order to avoid any pollution from the refrigerant circuit.
- 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 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 is 70~80%, and an
insulating material thicker than 20mm if the humidity
exceeds 80%. If the recommended thicknesses are
Installation and operating manual "1775 - EN"
(3.4, page
22).
Coat the flared surface
with POE refrigerant oil.
Do not use mineral oil .
not observed under the conditions described above,
condensation will form on the surface of the insulation
material. Lastly, take care to use pipe insulators
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).
3 .2
Shaping the refrigerant pipes
3 .2 .1 Bending
The refrigerant 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.
" Warning !
• Remove the insulation material locally to bend the
pipes.
• Do not bend the copper to any angle over 90°.
Never bend pipes more than 3 times in the same
position otherwise traces of fracturing may appear (from
strain-hardening the metal).
3 .2 .2 Creating the flarings
- 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).
Flaring tool
ø Hose
L
9.52 (3/8")
2.5 to 2.7
15.88 (5/8")
2.9 to 3.1
figure 16 - Flaring for flare connections
B
Flare
L
nut
C
Hose
dimensions in mm
B
/
C
0
-0,4
13 2
22
19 7
29
- 17 -
Advertisement
Table of Contents
