42
Starting up the system
The outdoor unit is supplied with a basic refrigerant
charge.
Model
Factory pre-charge
(kg)
CO equivalent
(tons)
80 2.95 6.16
105 2.95 6.16
120 3.30 6.89
140 3.90 8.14
160 3.90 8.14
180 4.50 9.40
An additional charge is required based on the length and
diameter of the refrigerant line connecting the outdoor
unit to the indoor units.
If the outdoor unit is connected to only one indoor unit:
Diameter of
pipes (mm)
Additional charge per metre of
length (kg)
6.4 0.022
9.5 0.054
12.7 0.110
15.9 0.170
19.1 0.260
22.2 0.360
l
WARNING
For each branch-joint (Y or branches) in the
refrigerant line, 0.5 m must be added to the
total length of the pipes.
Once the value has been obtained, proceed as follows:
– Place a tank of R410A refrigerant on a scale. In this
way the refrigerant will be charged in the liquid
state.
l
WARNING
The correct composition is in the liquid state,
not gaseous. For this reason it is advisable
to stop charging when approximately 5% by
weight of the initial content remains in the
cylinder. Otherwise there is a risk of transferring
the refrigerant in its gaseous state.
– Connect the 3-way pressure gauge (1) to the
gas pipe stop valve (2) of the master unit via the
low pressure pipe (B) and to the liquid pipe stop
valve (3) via the high pressure pipe (A) and to the
refrigerant tank (4) via the vacuum refrigerant pipe
(C).
2
33
A
B
C
Fig. 66
– Before opening the service valve on the R410A
cylinder, it is recommended to put the hoses
under vacuum, using the special pump, to avoid
the introduction of air and other non-condensable
products into the refrigeration circuit.
a
CAUTION
Danger of freezing. Slowly open the tank and
use PPE.
– Open the three valves on the pressure gauge to
start charging the refrigerant.
– Close the valves once the desired quantity is
reached.
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