19
GB
GB
7. CHARGE AND TEST OF THE SYSTEM
7.2 Draining and filling
the refrigerating circuit with R 32
- The operations indicated below must be carried out only after discon-
necting the air conditioner from the power supply.
- The outdoor unit holds a refrigerant R 32 charge suitable for pipelines up
to 5 meters in length.
- Do not mix any substance other than the specified refrigerant R 32 into
the refrigeration cycle.
- When refrigerant gas leaks occur, ventilate the room as soon and as
much as possible.
- R 32 , as well as other refrigerants, should always be recovered and
never be released directly into the environment.
- Use a vacuum pump for R 32 exclusively. Using the same vacuum pump
for different refrigerents may damage the vacuun pump or the unit.
- To use tools (manometric group, flexible and it pumps empty) exclusively
devoted to working fittings with refrigerant R 32
- Do not substitute or mix one gas with another, as they are not compat-
ible.
- For and R 32 charge, it is imperative to introduce the refrigerant in
liquid phase.
7.1.1 Vacuum and charge procedure
- Tighten the unions
(Fig. A) as indicated at page 6.3.
- Connect a vacuum pump to the service connection
3
(fig. A), via a set
of portable pressure gauges.
- Keep it running until a vacuum of 1 mBar or below has been reached, if
the pump is fitted with a vacuum gauge, or for at least 25 minutes if a
vacuum gauge is not available..
- Close the valve on the set of gauges connected to the pump, and turn
the pump off.
- If the pressure gauge set is fitted with a vacuum gauge, wait at
least 5 minutes, then check that the vacuum in the system has been
maintained. If not, look for the cause of the leak.
- For pipelines longer than
5
meters, it is necessary to fill the circuit, using a
measuring cylinder or an electronic balance, with a quantity of R 32 liquid
phase proportional to the size and length of the pipes used, as shown in
the following table page 11.
Flexible hose
connector
Union
3-way valve
Valve cap
2
Service connection
3
Service connection cap
Note:
To determine the charge additional Considering the length of a single
line.
Liquid
Flexible line
Gas
Vacuum pump
Gauge group
MIC55
After the addition of any refrigerant gas charge which may be necessary:
- Remove caps
B
(Fig. A) and with the appropriate key open the valves (it
is good practice to open them all the way, then close them by a half of a
turn).
- Put caps
B
(Fig. A) back on and tighten them.
- Check for possible leaks at the unions with a refrigerant gas leak
detector.
- Disconnect the equipment used from the union
3
(fig A) and close the
service connectors, refitting their caps tightly.
7.1.2 Precautions when adding refrigerant
- Fill from the liquid pipe in liquid form.
- Precautions when adding R32. It is a mixed refrigerant, so adding it in
gas form may cause the refrigerant composition to change, preventing
normal operation.
- Before filling, check whether the cylinder has a siphon attached or not.
(lt should have something like “liquid filling siphon attached” displayed on
it.)
Fig. A
Filling a cylinder with an attached siphon
Stand the cylinder upright when filling.
There is a siphon pipe inside, so the cylinder need not
be upside-down to fill with liquid.
Filling other cylinders
Turn the cylinder upside-down when filing .
Check the type of refrigerant to be used on the machine namiplate.
