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NOTE
Strictly follow the preconditions shown in the
above
refrigerant
charging
calculation method, and determine that the
additional amount shall not exceed the
maximum
refrigerant
shown in the table below. If the calculated
value of additional refrigerant exceeds the
limits shown in the table below, the total
length of the pipeline construction scheme
shall be shortened and the refrigerant
charging amount shall be recalculated to
meet the requirements shown in the table
below.
The maximum refrigerant addition shown in
the
table
below
is
recommended combination.
The refrigerant charge of the system must be
less than 100 kg. This means that in case the
calculated total refrigerant charge is equal to
or more than 100 kg you must divide your
multiple
outdoor
system
independent systems, each containing less
than 100 kg refrigerant charge. For factory
charge, refer to the unit name plate.
Table 5.8
HP
maximum refrigerant addition (kg)
8
10
12
14
16
18
20
22
The procedure for adding refrigerant is as follows:
1. Calculate additional refrigerant charge R (kg).
2. Place a tank of R410A refrigerant on a weighing
scale. Turn the tank upside down to ensure
refrigerant is charged in a liquid state. (R410A is a
blend of two different chemicals compounds.
Charging gaseous R410A into the system could
mean that the refrigerant charged is not of the correct
composition).
3. After vacuum drying, the blue and red pressure
gauge hoses should still be connected to the
pressure gauge and to the stop valves.
4. Connect the yellow hose from the pressure gauge to
the R410A refrigerant tank.
amount
additional
amount
based
on
the
into
smaller
19
21
23
23
29
29
30
30
34
5. Open the valve where the yellow hose meets the
pressure gauge, and open the refrigerant tank slightly
to let the refrigerant eliminate the air. Caution: open
the tank slowly to avoid freezing your hand.
6. Set the weighing scale to zero.
7. Open the three valves on the pressure gauge to
begin charging refrigerant.
8. When the amount charged reaches R (kg), close the
three valves. If the amount charged has not reached
R (kg) but no additional refrigerant can be charged,
close the three valves on the pressure gauge, run the
outdoor units in cooling mode, and then open the
yellow and blue valves. Continue charging until the
full R (kg) of refrigerant has been charged, then close
the yellow and blue valves. Note: Before running the
Pressure gauge
Yellow hose
ODU unit
R410A
refrigerant tank
Weighing scale
Blue hose Red hose
5.10 Electrical Wiring
5.10.1 Electrical wiring precautions
WARNING
Take note of the risk of electric shocks during
installation.
All the electric wires and components must
be installed by an installation personnel with
the proper electrician certification, and the
installation process must comply with the
applicable regulations.
Use only wires with copper cores for the
connections.
A main switch or safety device that can
disconnect all polarities must be installed,
and the switching device can be completely
disconnected
when
excessive voltage situation arises.
Wiring
must
be
carried
accordance with what is stated in the product
nameplate.
Field piping
Gas pipe stop valve
Liquid pipe stop valve
Service port
Fig 5.43
the
corresponding
out
in
strict
V.1
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