Checks And Connection; Filling With Gas - Fujitsu Waterstage Split Comfort 5 Series Installation Manual

►

Checks and connection

The refrigeration circuit is very sensitive to dust
and humidity: check that the area around the
connection is clean and dry before removing the
plugs protecting the refrigeration connectors.
Indicated blowing value: 6 bar for minimum
30 seconds for connection of 20 m.
Checking the gas connection (large diameter)
1 Connect the gas connection to the outdoor unit. Blow
dry nitrogen into the gas connection and inspect its end::
- If water or impurities emerge, use a brand new
refrigeration connection.
2 Otherwise, proceed with fl aring and connect the
refrigeration connection to the outdoor unit immediately.
Checking the liquid connection (small diameter)
3 Connect the liquid connection to the hydraulic
unit. Blow nitrogen into the gas-condenser-liquid
connection system and inspect its end (outdoor unit
side).
- If water or impurities emerge, use a brand new
refrigeration connection.
- Otherwise, proceed with fl aring and connect the
refrigeration connection to the outdoor unit immediately.
Take particular care to position the tube
opposite its connector so as not to risk
damaging the threads. A properly aligned
connector can be attached easily by hand
without much force being required.
- Where necessary, connect an adapter (reducer)
1/4''- 3/8'' or 1/2''- 5/8'' (see
- Comply with the indicated
(fi g. 31, page 27). If it is too tight, the fi tting may break
after a long period of time and cause a refrigerant leak.
UE
1
OU
Azote
Nitrogen
2 UE
OU
Azote
Nitrogen
3
UE
OU
Azote
Nitrogen
fi g. 33 - Checking refrigeration connections
Waterstage Split Comfort DHW Serie / INSTALLATION / 2125 - EN
fi g. 31, page 27)
tightening torques.
Liaison
Gas
connection gaz
MH*
HU
Liaison
Gas
gaz
connection
Liquid
connection
Liaison
liquide
MH*
HU
gaz
Gas
►

Filling with gas

■ see "Filling the installation with gas", page 72
Indicate on the label present on the outdoor
unit, the amount of gas (Factory + additional
fi lling) see fi g. 34.
If additional fi lling is required, do it before fi lling
the hydraulic unit with gas. Refer to paragraph
"Additional fi lling", page 30.
- Remove the access plugs (A)
from the valve controls.
- First of all fully open the liquid valve (small) and
then the gas valve (large) using an Allen (hex) key
(anti-clockwise direction) without using excessive
force against the stop.
- Quickly disconnect the hose from the Manifold.
- Refi t the 2 original caps (be sure they are clean) and
tighten them to the recommended tightening torque
indicated in the table
achieved in the caps only with metal to metal.
The outdoor unit does not contain any additional
refrigerant allowing the installation to be bled.
Bleeding by fl ushing is strictly forbidden.
▼ Final sealing test
The sealing test must be carried out with a certifi ed gas
detector (sensitivity of 5g/year).
Once the refrigeration circuit has been gassed as
described above, check that all the refrigeration
connectors are gas-tight (4 connectors). If the fl arings
have been made correctly, there should be no leaks.
If necessary, check the seal of the refrigeration valve
caps.
If the event of a leak
- Return the gas to the outdoor unit (pump down).
The pressure should not drop below atmospheric
pressure (0 relative bar read on the Manifold) so as not
to contaminate the recovered gas with air or moisture.
- Redo the connection,
- Restart the commissioning procedure.
fi g. 34 - Additional fi lling label
(fi g. 55, page
fi g. 31, page 27. A seal is
73)
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