figure 22 - connection of the flexible hose to the gas valve
Liaison frigorifique
Bouchon (A)
Clé hexagonale de 4 mm
Vanne 3 voies
Orifice de charge
Bouchon (B)
Flexible de service (bleu)
muni d’un poussoir de valve
High pressure
flexible hose (red)
Refrigerating connector (gas)
•
First leak test
-
Remove the protection plug (
B
) from the filling orifice
(
Schrader
) on the gas valve (large diameter).
-
Connect the high pressure flexible hose of the
Manifold
-
Connect the Nitrogen bottle to the
Manifold
(only use
dehydrated Nitrogen type U).
-
Pressurise the Nitrogen (10 bar maximum) in
the refrigerating circuit (
gas-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
-
Search for leaks with a leak detector product, 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 any leakage is
excluded, leaving empty nitrogen to a pressure greater
than atmospheric pressure (0,2 to 0,4 bar).
•
Evacuation and connection of gas to refrigerating connections
-
If required, calibrate the pressure gauge(s) of the
Manifold
at 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.
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 after reaching the vacuum.
-
Close the
Manifold
tap then switch off the vacuum
pump
without disconnecting any flexible hoses
"
If the outdoor temperature is between
+5 and +10 °C, use method 3 empty
(cf. APPENDIX 2).
-
Remove the access plugs (A) from the valve controls.
"
If an additional charge is requires, add the additional
charge before filling the hydraulic unit with gas.
Refer to paragraph
-
First open the liquid valve (small) then the gas valve
(large) to maximum with an Allen key (anticlockwise
direction) without forcing it too far.
-
Quickly disconnect the
Manifold hose
-
Refit the 2 original plugs (ensure they are clean) and
tighten to the recommended torque from the table
. The sealing is performed in the
caps only metal to metal.
The outdoor unit does not contain any additional
refrigerating fluid to allow the installation to be drained.
Drain by flushing is strictly forbidden.
2 .8 .2 Final leak test
The sealing test must be performed with a certified gas
detector (sensitivity 5g/year).
Once the refrigerating circuit has been filled with gas
as described previously, check all of the refrigerating
connectors of the installation for leaks (4 connectors).
If the tube expanders have been correctly used, there
should be no leaks. If required check the refrigerating
tap plugs for leaks.
"
In case of leaks:
-
Feed gas into the outdoor unit (pump down). The
pressure must not drop below atmospheric pressure
(0 bar relative read on
Manifold
) to avoid polluting the
gas collected with air or humidity.
-
Make the connection again,
-
Re-start the commissioning procedure.
2 .8 .3 Additional volume added
Connection
liquid
Connection
liquid
Gas
Gas
High
pressure
High
pressure
High
pressure
Leak test
Valve closed
Pressure check
Nitrogen
3 way valve
Plug (A)
Plug (B)
4 mm Allen key
Filling orifice
Vacuum gauge
Vacuum pump
Installation and operating manual
"
1605 - EN
"
alfea hybrid duo heat pump oil low NOx CH
- 22 -
