2 .8 Commissioning
the refrigerating gas installation
"
This operation is only to be carried out by
qualified fitters in compliance with the legislation
for the handling of refrigerating fluids.
"
Evacuation with a calibrated vacuum pump is
essential (see appendix 1).
"
Do not use equipment that has previously been
used with a refrigerating fluid other than a HFC.
"
Remove the refrigerant circuit caps only when
building the refrigerant connections .
"
Unfavourable conditions:
- If the temperature outdoors is b5 and
+10°C
, a vacuum gauge must be used to check
the evacuation and use the 3 vacuum method.
(
see appendix 2
).
- If the temperature outdoors is below +5°C
, it is
strongly recommended to connect the gas.
2 .8 .1 Start procedure
•
Checks before connection:
Checking the gas connection (large diameter).
-
Connect the "Gas" connection to the outdoor unit.
-
Blow dry nitrogen into the "Gas" connection and
observe this end:
If water or impurities come out, use a new refrigerating
connection
Otherwise expand and immediately connect to the
Hydraulic module
Checking the liquid connection (small diameter).
-Connect the "Liquid" connection to the hydraulic unit
-
Blast with Nitrogen the entire
gas-condensor-liquid
connection
and observe the end (outdoor unit side).
If water or impurities come out, use a new refrigerating
connection
Otherwise expand and immediately connect to the
outdoor unit
APPENDIX 1
Method for calibration and control of a vacuum
pump
-
Check the oil level of the vacuum pump.
-
Connect the vacuum pump with the vacuum gauge
according to the scheme.
-
Empty for 3 minutes
-
After 3 minutes, the pump
reaches its threshold value and the vacuum gauge
needle does not move.
-
Compare the obtained pressure with the value
of the table. Depending on the temperature, this
pressure must be less than the value indicated in
the table.
=> If this is not the case, change the seal, the
flexible hose or the pump.
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
Vacuomètre
Flexible
bouché
Pompe
à vide
APPENDIX 2
Method 3 empty
-
Connect the high pressure flexible of the manifold
on the load orifice (gas connection). A valve must
be mounted on the flexible hose from the vacuum
pump in order to isolate it.
a)
Empty up to the desired value (see table
appendix
1
),
Lo
Hi
UE
MH
Liaison...
liquide
gaz
Haute
pression
Jeu de manomètres
(manifold)
Basse
pression
Vacuomètre
Pompe à vide
b
) Switch off the vacuum pump, close the valve at
the end of the service hose (yellow), Connect this
hose to the pressure regulator of the Nitrogen bottle,
inject 2 bars, close the hose valve,
Lo
Hi
UE
MH
Liaison...
liquide
gaz
Haute
pression
Azote
c)
Connect the flexible hose again to the vacuum
pump, switch it on and progressively open the
flexible valve hose.
Lo
Hi
UE
MH
Liaison...
liquide
gaz
Haute
pression
d)
Repeat this operation at least three times.
"
Reminder: it is strictly prohibited to carry out
these operations with refrigerating fluid.
Outlet
hose
Vacuum
gauge
Set of pressure gauges
(manifold)
Vacuum
pump
Low
pressure
High
pressure
High
pressure
High
pressure
Nitrogen
Connection
liquid
Connection
liquid
Connection
liquid
Gas
Gas
Gas
Vacuum gauge
Vacuum pump
Installation and operating manual
"
1605 - EN
"
- 21 -
alfea hybrid duo heat pump oil low NOx CH