Service Manual -
B-VMHxxAV-1
10. Engineering of Electrical Wring
10.
Engineering of Electrical Wring
1. Highlights of electrical wiring installation
•
All field wiring construction should be finished by
qualified electrician.
•
Air conditioning equipment should be grounded ac-
cording to the local electrical regulations.
•
Current leakage protection switch should be in-
stalled.
•
Do not connect the power wire to the terminal of
signal wire.
•
When power wire is parallel with signal wire, put
wires to their own wire tube and remain at least
300mm gap.
•
According to table in indoor part named “the speci-
fication of the power” to choose the wiring, make
sure the selected wiring not small than the date
showing in the table.
•
Select different colors for different wire according to
relevant regulations.
•
Do not use metal wire tube at the place with acid or
alkali corrosion, adopt plastic wire tube to replace it.
•
There must be not wire connect joint in the wire
tube If joint is a must, set a connection box at the
place.
•
The wiring with different voltage should not be in
one wire tube.
•
Ensure that the color of the wires of outdoor and
the terminal No. are same as those of indoor unit
respectively.
Table: Minimum Cross-Sectional Area able of Power and
Signal Cables
For North America:
Rated Current of
Appliance (A)
AWG
≤ 6
18
6 - 10
16
10 - 16
14
16 - 25
12
25 - 32
10
For the other regions:
Rated Current of
Appliance (A)
Nominal Cross-Sectional
Area(mm
2
)
≤ 6
0.75
6 - 10
1
10 - 16
1.5
16 - 25
2.5
25 - 32
4
32 - 45
6
2. Specific wiring method
Connection method A:
Refer to the wiring method of internal and external
machine communication and wired controller as follows:
(A)
Outdoor
Unit
R C
L G Y1
Y1/Y2
B W
W2 E
W1
DH
S1 S2
S1 S2
Indoor unit
Wired
controller
Wired
controller
(B)
Outdoor
Unit
R C
L G Y1
Y1/Y2
B W
W2 E
W1
DH L1(1)L2(2) S(3)
L1(1) L2(2) S(3)
Indoor unit
Wired
controller
Wired
controller
Connection method B:
To use a 24V thermostat, you need to refer to the
following wiring:
(A)
Outdoor
Unit
24V thermostat
R C G Y1 Y2 B W
W2 E
W1
DH L
R C G Y1 Y2 B W
W2 E
W1
DH L
S1 S2
S1 S2
Indoor unit
(B)
Outdoor
Unit
L1(1) L2(2) S(3)
L1(1) L2(2) S(3)
24V thermostat
R C G Y1 Y2 B W
W2 E
W1
DH L
R C G Y1 Y2 B W
W2 E
W1
DH L
Indoor unit
Summary of Contents for Comfort-Aire Century A-VMH18SV-1
Page 30: ...Service Manual B VMHxxAV 1 ...
Page 37: ...Service Manual B VMHxxAV 1 Outdoor Unit 3 3 Panel Plate X430 Square grille ...
Page 38: ...Service Manual B VMHxxAV 1 Outdoor Unit 4 4 Panel Plate D30 Square grille ...
Page 39: ...Service Manual B VMHxxAV 1 Outdoor Unit 5 5 2 Service Place Minimim 4 Recommended 12 ...
Page 42: ...Service Manual B VMHxxAV 1 Outdoor Unit 8 8 A VMH18SV 1 A VMH24SV 1 ...
Page 45: ...Service Manual B VMHxxAV 1 ...
Page 103: ...Service Manual B VMHxxAV 1 Troubleshooting 15 ...