HTW MI2 Serie Manuel D'installation page 43

Set proper external static pressure (ESP) according to the actual installation

conditions. Otherwise it may cause some problems.
If the connecting duct is long and the ESP setting is small, the airflow will be
very small, leading to poor performance.
If the connecting duct is short and the ESP setting is large, the airflow will be
very large, leading to higher operating noise and even water may be blown
out through the air outlet.

ESP can be set through the DIP switch SW2 on the main board or the new
wired controller. Please refer to Part "8.3 DIP switch settings on main board"
for SW2 setting or the wired controller manual for wired controller setting.
Four ESP can be set through DIP switch SW2.
Capacity ESP1
7.1-16.0kW 100Pa
170Pa
20.0-28.0kW
45-56kW 300Pa
Twenty ESP can be set through the new wired controller.
Capacity 00 01 02
7.1-16kW 30Pa 50Pa 60Pa
20-28kW 30Pa 50Pa 60Pa
40-56kW 100Pa 120Pa 140Pa 160Pa 180Pa 200Pa 220Pa 240Pa 260Pa 270Pa
Capacity 10 11 12
7.1-16kW 140Pa 150Pa 160Pa 170Pa 180Pa 190Pa 200Pa 200Pa 200Pa 200Pa
20-28kW 140Pa 150Pa 160Pa 170Pa 180Pa 190Pa 200Pa 210Pa 230Pa 250Pa
40- 56kW 280Pa 290Pa 300Pa 310Pa 320Pa 330Pa 340Pa 360Pa 380Pa 400Pa
7. Electrical Wiring
Warning
All the supplied parts, materials and electrical works must comply with
local regulations.
Use only copper wires.
Use a dedicated power supply for the air-conditioners. The power
voltage must be in line with the rated voltage.
The electrical wiring works must be carried out by a professional
technician, and must comply with the labels stated in the circuit diagram.
Before the electrical connection works are carried out, turn off the
power supply to prevent injuries caused by electric shock.
The external power supply circuit of the air conditioner must include
an earth line, and the earth line of the power cord connecting to the
indoor unit must be securely connected to the earth line of the
external power supply.
Leakage protective devices must be configured according to the local
technical standards and requirements for electrical and electronic devices.
The fixed wiring connected must be equipped with an all-pole
disconnection device with a minimum 3 mm contact separation.
The distance between the power cord and signalling line must be at
least 300 mm to prevent the occurrences of electrical interference,
malfunction or damage to electrical components. At the same time,
these line must not come in contact with the piping and valves.
Choose electrical wiring that conforms to the corresponding electrical
requirements.
Connect to the power supply only after all the wiring and connection
works have been completed, and carefully checked to be correct.
7.1 Power Cord Connection
Use a dedicated power supply for the indoor unit that is different from

the power supply for the outdoor unit.
 Use the same power supply, circuit breaker and leakage protective
device for the indoor units connected to the same outdoor unit.
Outdoor power
supply
RCCB
Grounding line
Grounding line
Indoor power
supply
RCCB
Communication wire between
indoor and outdoor units
ESP2 ESP3 ESP4
50Pa 170Pa 200Pa
100Pa 200Pa 250Pa
100Pa 200Pa 400Pa
03 04 05 06 07 08
70Pa 80Pa 90Pa 100Pa 110Pa 120Pa 130Pa
70Pa 80Pa 90Pa 100Pa 110Pa 120Pa 130Pa
13 14 15 16 17 18
Wire slot
Indoor unit
Figure 7.1
Figure 7.2 shows the power supply terminal of the indoor unit.
When connecting to the power supply terminal, use the circular wiring terminal
with the insulation casing (see Figure 7.3).
Use power cord that conforms to the specifications and connect the power cord
firmly. To prevent the cord from being pulled out by external force, make sure it
is fixed securely.
If circular wiring terminal with the insulation casing cannot be used, please
make sure that:
• Do not connect two power cords with different diameters to the same power
09
supply terminal (may cause overheating of wires). See Figure 7.4.
19 +
Figure 7.3
7.2 Electrical Wiring Specifications
220-240V~50Hz
220-240V~50/60Hz
Power supply
Breakers with
L
current leakage
All-pole disconnection
device with leakage
protection
Refer to Tables 7.1 and 7.2 for the specifications of the power cord and
communication wire. A wiring capacity that is too small will cause the
electrical wiring to become too hot, and lead to accidents when the unit
burns and becomes damaged.
Table 7.1
Model
Phase
Power
supply
Volt and frequency
Communication wire between
indoor and outdoor units
Communication wire between
indoor unit and wired controller
Field fuses(7.1-28kW/45-56kW)
* Please refer to the corresponding wired controller manual for the wired
controller wiring.
14
L
POWER INPUT
Figure 7.2
Circular wiring
terminal
Proper power wiring connections
Insulation tube
Power
cord
Figure 7.4
Switch (breakers for
wiring and over current
protection)
N
Pull box
Indoor unit Indoor unit
Figure 7.5
7.1-56.0kW
1-phase
220-240V~50Hz
220-240V~50/60Hz
Shield 3×AWG16-AWG20
Shield AWG16-AWG20
*
: Copper wire
Indoor unit
Pull box
Pull box
Indoor unit
15A/30A