Seal Test; Creating A Vacuum - Fujitsu WATERSTAGE WOYG112LHT Maintenance Document

Air to Water Heat Pump (Split integrated DHW type)

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.
High
Haute
Lo Hi
pressure
pression
Liaison...
Connection
UE
Liquid liquide
gaz
Gas
- If pressure drop, get it 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
liquide
gaz
- When the pressure is stable and leakage is excluded,
drain nitrogen letting a pressure above atmospheric
pressure (0,2 to 0,4 bar).
3-way valve
High pressure hose (red)
figure 21 - Connection of the hose on the "Gaz" valve
Installation and operating manual "1768 - EN"
Azote Nitrogen
Max. 10 bar
10 bars max.
during 30 mn mini.
30 mn mini
MH
Closed valve,
Vanne fermée,
pressure control
Contrôle pression
Leak control
Contrôle
d'étanchéité
MH
Refrigerant connexion
(gas)
Plug (A)
Hex / Allen key (4mm)
Load orifice
Plug (B)

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.
High
Haute
Lo Hi
pressure
pression
Liaison...
Connection
UE
liquide
Liquid
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 and then stop the vacuum
pump without disconnecting any of the hoses in
place
Vacuomètre Vacuum gauge
MH
Vacuum pump Pompe à vide
Vacuum pump
10°C<T<15°C 15°C < T
0 015 0 020
20
15
- 21 -