Appendix; Filling The Installation With Gas - Fujitsu Waterstage Split Comfort 5 Series Installation Manual

Appendix

►

Filling the installation with gas

This operation is reserved for installers familiar with the legislation for handling refrigerants.
Creating a vacuum with a calibrated vacuum pump is essential (see APPENDIX 1).
Never use equipment used previously with any refrigerant other than a HFC.
Only remove the refrigeration circuit caps when performing the refrigeration connections.
If the outdoor temperature is below +10°C
- You must use the triple evacuation method
(see APPENDIX 2).
- We recommend installing a dehydrator fi lter
(and this is highly recommended if the outdoor
temperature is below +5°C).
APPENDIX 1
Method for calibrating and checking a vacuum
pump
- Check the vacuum pump's oil level.
- Connect the vacuum pump
to the vacuum gauge as
shown in the diagram.
- Pump down for 3 minutes.
- After 3 minutes, the pump
reaches its threshold vacuum limit and the vacuum
gauge's needle stops moving.
- Compare the obtained pressure value against the
table of values. Depending on the temperature, this
pressure should be lower than that shown in the
table.
=> If this is not the case, replace the gasket,
hose or pump.
T °C 5°C<T<10°C
Pmax
- bar 0.009
- mbar 9
- 72 -
Vacuum
gauge
Vacuomètre
Plugged
Flexible
hose
bouché
Vacuum
Pompe
pump
à vide
10°C<T<15°C 15°C < T
0.015 0.020
15 20
APPENDIX 2
Triple Evacuation Method
- Connect the Manifold high-pressure hose to the
fi lling hole (gas connection). A valve must be fi tted
to the vacuum pump's hose so you can shut it off .
a) Create a vacuum until the desired value is
reached and maintain this value for 30 mins
(see table in APPENDIX 1),
Manometers kit
Jeu de manomètres
(Manifold)
(Manifold)
Low
Basse Haute
Lo Hi
Pressure
pression pression
Pressure
b) Switch off the vacuum pump, close the valve at
the end of the service hose (yellow), connect this
hose to the expansion valve on the nitrogen bottle,
fi ll to 2 bar, close the hose's valve again,
High
Haute
Lo Hi
Pressure
pression
OU UE
c) Connect this hose to the vacuum pump again,
switch it on and slowly open the hose's valve.
High
Haute
Lo
Hi
Pressure
pression
OU UE
d) Repeat this operation at least three times.
Remember: performing these operations using
refrigerant is strictly prohibited.
Waterstage Split Comfort DHW Serie / INSTALLATION / 2125 - EN
High
Connection
Liaison...
OU
UE
MH HU
Liquid
liquide
Vacuum pump Pompe à vide
gaz
Gas
Nitrogen
Liaison...
Connection
MH
HU
Liquid liquide
gaz
Gas
Liaison...
Connection
HU MH
Liquid
liquide
gaz
Gas
Vacuum
Vacuomètre
Gauge
Azote