Filling The Installation With Gas; Sealing Test; Additional Charge - Fujitsu Waterstage WOYG112LCTA Maintenance Document

Air to Water Heat Pump (Split integrated DHW type)

3 .4 .3 Filling the installation with gas

If an additional charge is requires, add the
additional charge before filling the hydraulic unit
with gas. Please refer to the para .
charge", page 22 .
- 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 a hex key
(counterclockwise direction)
excessively against the stop.
- Remove the hose rapidly to the Manifold
- Refit the 2 original caps (be sure they are clean) and
tighten them to the recommended tightening torque
(figure 18, page 18). The sealing is performed in the
caps only metal to metal.
The outdoor unit does not contain any additional
refrigerant, enabling the installation to be purged.
Flushing is strictly forbidden.

3 .4 .4 Sealing test

The sealing test must be performed with a certified gas
detector (sensitivity 5g/year).
Once the refrigerant circuit has been gassed as
described above, check that all the refrigerant connectors
are gas-tight (4 connectors). If the flarings have been
made correctly, there should be no leaks. Eventually,
check the tightness of the refrigerant valves caps.
" If there is a leak:
- Bring the gas into the outdoor unit (pump down).
The pressure should not drop below atmospheric
pressure (0 bar to read on Manifold) so as not to
contaminate the recovered gas with air or moisture.
- Make the connection again.
- Repeat the commissioning procedure.
- 22 -

3 .4 .5 Additional charge

Length of
the connections
"Additional
Additional charge
The charge in the outdoor units corresponds to the
maximum distances between the outdoor unit and the
hydraulic unit defined in
without forcing
are greater, an additional charge of R410A is required.
The additional charge depends on the distance
between the outdoor unit and the hydraulic unit for
each type of appliance. The additional charge of R410A
must necessarily be made by an approved refrigerant
engineer.
• Example of additional charge :
An outdoor unit 17 m away from the hydraulic unit will
require an additional charge of :
Additional charge = (17 - 15) x 50 = 100 g.
The charge must be introduced after creating the
vacuum and before the hydraulic unit is filled with gas,
as follows :
- Disconnect the vacuum pump (yellow hose) and
- Open the bottle's valve.
- Bleed the yellow hose by loosening it slightly on the
- Place the bottle on scales with a minimum accuracy
- Carefully open the blue valve slightly and check the
- As soon as the value displayed has dropped by the
- Then rapidly disconnect the hose connected to the
- Proceed to fill the hydraulic unit with gas.
• Only use R410A !
• Only use tools suitable for R410A
• Always charge in the fluid phase.
• Never exceed the length or the maximum difference
connect a bottle of R410A instead in the liquid
extraction position
Manifold side.
of 10 g. Note the weight.
value shown on the scales.
value for the calculated additional charge, close the
bottle and disconnect it.
appliance.
" Warning
(set of manometers).
in level.
Gas
Liquid
figure 22 - "Gas" bottle R410A
Installation and operating manual "1768 - EN"
50 g of R410A
per additional meter
15 m 20 m max.
none 250 g
page 19. If the distances
R410A