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NOTE
Strictly follow the preconditions shown in the
above
refrigerant
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 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 master unit stop valves.
4. Connect the yellow hose from the pressure gauge to
the R410A refrigerant tank.
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
system,
be
sure
pre-commissioning checks and be sure to open all
stop valves as running the system with the stop valves
closed would damage the compressor.
Pressure gauge
Yellow hose
ODU unit
R410A
refrigerant tank
Weighing scale
Blue hose Red hose
charging
amount
additional
amount
to
complete
all
the
Field piping
① Gas pipe stop valve
② Liquid pipe stop valve
③ Service port
Fig 5.33
5.10 Electrical Wiring
5.10.1 Electrical wiring precautions
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
excessive voltage situation arises.
Wiring
must
accordance with what is stated in the product
nameplate.
Do not squeeze or pull the unit connection,
and make sure the wiring is not in contact
with the sharp edges of the sheet metal.
Make sure the earthing connection is safe
and reliable. Do not connect the earth wire to
public pipes, telephone earth wires, surge
absorbers and other places that are not
designed for earthing. Improper earthing may
cause electric shock.
Make sure the fuses and circuit breakers
installed
specifications.
Make sure an electric leakage protection
device is installed to prevent electric shocks
or fires.
The model specifications and characteristics
(anti high-frequency noise characteristics) of
the electric leakage protection device are
compatible with the unit to prevent frequent
tripping.
Before power on, make sure the connections
between the power cord and terminals of the
components are secure, and the metallic
cover of the electric control box is closed
tightly.
27
WARNING
when
the
corresponding
be
carried
out
in
strict
WARNING
meet
the
corresponding
V.1
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