Fujitsu WOYA060LFCA, Installation And Operating Manual, Page: 25 / 92

3 .4 .1 Seal test
- Remove the protective plugs ( B ) from the charging
hole ( Schrader ) in the "Gas" valve (large diameter).
- Connect the high pressure hose to the Manifold
- Connect the bottle of nitrogen to the Manifold
(Use only dry nitrogen type U).
- Pressurize the refrigerant circuit with nitrogen
(10 bar maximum) ("Gas" connection – condensor -
"Liquid" connection assembly).
- Let the circuit under pressure for 30 minutes.
Lo
Hi
UE
MH
Liaison...
liquide
gaz
Haute
pression
Azote
10 bars max.
30 mn mini
- If pressure drop, get it down to 1 bar and look for leaks
with a leak detector, repair and repeat the test.
Lo Hi
UE
MH
Liaison...
liquide
gaz
Haute
pression
Contrôle
d’étanchéité
Vanne fermée,
Contrôle pression
- When the pressure is stable and leakage is excluded,
drain nitrogen letting a pressure above atmospheric
pressure (0,2 to 0,4 bar).
3 .4 .2 Creating a vacuum
The 3 empty method (ANNEX 2) is highly
recommended for any installation especially when
the outdoor temperature is below 10 ° C.
- If necessary, calibrate the Manifold gauge to 0 bar.
Adjust the vacuum gauge to the atmospheric pressure
(around 1013 mbar).
- Connect the vacuum pump to the Manifold . Connect
a vacuum gauge if the vacuum pump is not equipped.
Lo Hi
UE
MH
Liaison...
liquide
gaz
Haute
pression
Vacuomètre
Pompe à vide
- Create a vacuum until the residual pressure* in the
circuit falls below the value given in the following table
(* measured with the vacuum gauge).
T °C 5°C<T<10°C 10°C<T<15°C 15°C < T
Pmax
- bar
- mbar
0 009
9
0 015
15
0 020
20
- Let the pump continue to operate for another
30 minutes minimum after reaching the vacuum.
- Close the Manifold valve and then stop the vacuum
pump without disconnecting any of the hoses in
place
High
pressure
High
pressure
High
pressure
Vacuum pump
Nitrogen
Max. 10 bar
during 30 mn mini.
Closed valve,
pressure control
Connection
Liquid
Leak control
Connection
Liquid
Gas
Gas
Vacuum gauge
figure 21 - Connexion of the hose on the "Gaz" valve
Refrigerant connexion
(gas)
Plug (A)
Hex / Allen key (4mm)
3-way valve
Load orifice
Plug (B)
High pressure hose (red)
Installation and operation manual "1764 - EN" - 25 -
Air to Water Heat Pump, split system