Mars Comfort-Aire Century VCD-SA Series Service Manual page 81

Service Manual - VCDxxSA
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)
≤ 6
6 - 10
10 - 16
16 - 25
25 - 32
For the other regions:
Rated Current of
Appliance (A)
≤ 6
6 - 10
10 - 16
16 - 25
25 - 32
32 - 45
AWG
18
16
14
12
10
Nominal Cross-Sectional
Area(mm 2 )
0.75
1
1.5
2.5
4
6
 10. Engineering of Electrical Wring
2. Specific wiring method
Connection method A:
Refer to the wiring method of internal and external
machine communication and wired controller as follows:
Indoor unit
Wired
controller R C L G Y1 B W
Y1/Y2
Wired
controller
Connection method B:
To use a 24V thermostat, you need to refer to the
following wiring:
R C G Y1 Y2 B W
R C G Y1 Y2 B W W1 W2 E DH L
24V thermostat
NOTE: The wiring method of the thermostat and
the internal machine refers to the wiring of the non-
communication scheme.
Connection method C:
Non-communication scheme wiring reference
• Wiring for 4H and 2C thermostat
W2
W1/E
O/B
Y2
Y1
G
L
C
R
DH
THERMOSTAT
DH R C L G Y1
INDOOR UNIT
S4-2 DIP switch o
Perform disconnection and
short-circuit to achieve
partition, control or dehumidi cation
• Wiring for 3H and 1C thermostat
W1 W2 E DH S1 S2
R C Y1 Y2 B W D L S1 S2
Outdoor Unit
Indoor unit
W1 W2 E DH L S1 S2
R C Y1 Y2 B W D L S1 S2
Outdoor Unit
B W W1 W2 E R C Y1 Y2 B W D
OUTDOOR UNIT
S4-1 DIP switch o
Disconnect and short
circuit to realize heating
segment

L