31-5000755 Rev. 0
21
ENGLISH
INSTALLATION INSTRUCTIONS
Electric Heater (cont)
Oudoor unit, central control and all indoor units are of parallel connection via two lines without polarity.
There are three ways of connecting the line control and indoor units:
A. One wired control to control multiple units, i.e. 2-3 indoor units, as shown in the above figure, (1-3 indoor units). The
indoor unit 3 is the wire controlled main unit and others are the wired controlled subordinate units. The remote control
and the main unit (directly connected to the indoor unit of wired control) are connected via three wires with polarity.
Other indoor units and the main unit are connected via three lines with polarity. SW01 on the main unit of wired control
is set to 0 while SW01 on other subordinate units of wired control are set to 1, 2 and so on in turn. (Please refer to the
code setting A at page 15)
B. One wired control controls one indoor unit, as shown in the above figure (indoor unit 4-8). The indoor units and the
wired control are connected via three lines with polarity.
C. Two wired controls control one indoor unit, as shown in the figure (indoor unit 9). Either of the wired controls can be set
to be the main wired control while the other is set to be the auxiliary wired control. The main wired control and indoor
units, and the main and auxiliary line controls are connected via three lines with polarity.
Note:
For DC motor/low ESP duct type, the PCB comes with the terminal blocks. Please be sure to pay attention to do
the wiring according to the labels. The power lines and signal lines go through the metal wire hole separately with the
protective sleeve of the connecting line.
Wire gauge size and breaker size for total indoor amp draw. Current NEC guidelines and local codes will trump this chart.
Items Total
Current of Indoor
Units(A)
Cross Section
AWG (mm
2
)
Length
in.(m)
Rated Current of
Overflow Breaker (A)
Rated current of
residual Circuit
Breaker(A)
Ground Fault
Interrupter(mA)
Response time(S)
Cross Sectional
Area of Signal Line
<7
14(2.5)
65.6(20)
10
10 A,30 mA,0.1S or
below
16 AWG (1.25mm
2
)
≥7 and <11
12(4)
65.6(20)
15
15 A,30 mA,0.1S or
below
≥11and <16
10(6)
82(25)
20
20 A,30 mA,0.1S or
below
≥16 and <22
8(8)
98.4(30)
30
30 A,30 mA,0.1S or
below
≥22 and <27
6(10)
131(40)
30
30 A,30 mA,0.1S or
below
The electrical power line and signal line connections must be tight.
• Every indoor unit must have a ground connection.
• The power wire should be size up if it exceeds the permissible length.
• Shielding of the control wire of all the indoor and outdoor units should be connected together and grounded at one
point.
• Signal lines should not exceed 3280ft (1000m)
