Filling The Installation With Gas; The Refrigeration Connections With Gas; Sealing Test - Fujitsu 112 Installation And Operating Manual

Heat pump split single service 3 phase
2 7

Filling the installation with gas

" This operation is reserved for installers familiar
with the legislation for handling refrigerants
" Creating a vacuum with a vacuum pump is
essential
" Never use equipment used beforehand with any
refrigerant other than a HFC
2 7 1 Creating a vacuum and filling

the refrigeration connections with gas

(see figure 21).
- Remove the protective plugs (B) from the charging
hole (Schrader) in the gas valve (large diameter).
- Connect the blue hose (on the side with a valve
pusher in good condition) from the set of manometers
(manifold).
- Connect the yellow hose to a vacuum pump and open
the blue valve on the set of manometers.
- Create a vacuum until the residual pressure in the
circuit falls below 0.01 bar.
- Let the pump continue to operate for another 15
minutes after reaching the vacuum.
- Close the blue valve on the set of manometers and
then stop the vacuum pump without disconnecting
any of the hoses in place.
- Wait 10 minutes. If the pressure rises during this
10-minute period, there is a leak in the circuit. Trace it
and repair it: then start again.
When the pressure has remained stable for 10
minutes after the vacuum pump stops, the circuit
is considered to be gas-tight.
- 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 Please refer to the section ("Additional
charge", page 20)
- First of all fully open the small valve and then the
large one using a hex key (counterclockwise direction)
without forcing excessively against the stop.
- Remove the blue hose rapidly.
- Refit the 2 plugs and tighten them to the recommended
tightening torque (see figure 19, page
The outdoor unit does not contain any additional
refrigerant, enabling the installation to be purged.
Flushing is strictly forbidden.
Installation and operating manual "1364 - EN"
Service hose (blue)
fitted with valve push-button
Plug (A)
Hex / Allen key
of 4 mm

2 7 2 Sealing test

Once the refrigeration circuit has been gassed as
17).
described above, check that all the refrigeration
connectors are gas-tight.
The sealing test must be performed with an approved
gas detector. If the flarings have been made correctly,
there should be no leaks.
" If there is a leak, make the connection again
Manomter kit
(manifold)
Low
pressure
Service
hose
Gas valve
Figure 21 - Extraction under vacuum and gassing
High
pressure
Vacuum
pump
Plug (B)
Load orifice
3-way valve
Refrigeration
connection
- 19 -