Fujitsu Waterstage Split Comfort 5 Series Installation Manual page 73

▼ Seal test
- Remove the protective plug (B) from the fi lling hole
(Schrader) in the gas valve (large diameter).
- Connect the high pressure hose from the Manifold to
the fi lling hole (fi g. 55).
- Connect the nitrogen bottle to the Manifold (only use
dehydrated nitrogen type U).
- Fill the refrigeration circuit with nitrogen to maximum
10 bar (gas-condenser-liquid connection system).
- Maintain this pressure in the circuit for 30 minutes.
High
Haute
Lo Hi
Pressure
pression
Liaison...
Connection
UE OU
Liquid liquide
gaz
Gas
- If a pressure drop occurs, bring it back down to 1 bar
and look for leaks with a leak detector, repair and
repeat the test.
High
Haute
Lo Hi
Pressure
pression
Liaison...
UE
OU
liquide
gaz
- Once the pressure is steady and there are no leaks,
empty the nitrogen by leaving the pressure above
atmospheric pressure (between 0.2 and 0.4 bar).
Vanne 3 voies
3-way valve
High-pressure hose (red)
Flexible haute pression
(rouge)
fi g. 55 - Connecting the hose to the gas valve
Waterstage Split Comfort DHW Serie / INSTALLATION / 2125 - EN
Nitrogen
Azote
Max 10 bar
10 bars max.
Min 30 mins
30 mn mini
MH
HU
Valve closed
Vanne fermée,
Contrôle pression
Seal test
Contrôle
d'étanchéité
MH
HU
Refrigeration connection
Liaison frigorifique (gaz)
(gas)
Bouchon (A)
Plug (A)
Allen (hex) key (4 mm)
Clé hexagonale/Allen
(4mm)
Filling hole
Orifice de charge
Plug (B)
Bouchon (B)
▼ Creating a vacuum
The triple evacuation method (APPENDIX 2)
is strongly recommended for any installation
and especially when the outdoor temperature
is below 10°C.
- If necessary, calibrate the
Manifold to 0 bar. Adjust the vacuum gauge to the
atmospheric pressure (≈ 1013 mbar).
- Connect the vacuum pump to the Manifold. Connect
a vacuum gauge if the vacuum pump is not equipped
with one.
High
Haute
Lo Hi
Pressure
pression
Liaison...
Connection
UE OU
Liquid liquide
gaz
Gas
- 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
Pmax
- bar 0.009
- mbar 9
- Let the pump continue to operate for another
30 minutes minimum after reaching the vacuum.
- Close the Manifold valve, then stop the vacuum pump
without disconnecting any of the hoses in place.
manometers(s) of the
Vacuomètre Vacuum
Gauge
MH
HU
Vacuum pump Pompe à vide
10°C<T<15°C 15°C < T
0.015 0.020
15 20
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