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9
Step 6 — Position and Connect Controller —
Wired controllers should be installed in a position that main-
tains good temperature control:
• Position the thermostat approximately 48 in. above floor
level.
• Do not position thermostat where it can be directly
affected by the unit’s discharge airstream.
• Avoid external walls and drafts from windows and doors.
• Avoid positioning near shelves and curtains as these
restrict air movement.
• Avoid heat sources such as direct sunlight, heaters, dim-
mer switches, and other electrical devices.
• See Fig. 16 for an example of communication wire con-
nection.
CONTROL WIRING
1.
Use copper core PVC insulated sheathed shielded twisted
cord.
2.
For IDU (indoor unit) and ODU (outdoor unit) communi-
cation, use ‘P, Q” terminals. Shielded core should be used
for ground.
3.
Wiring should be done according to wiring diagram.
Fig. 15 — 40VMU012-048 Typical Wiring Diagram
SW8
Main Board
1
CN1
CN3 CN18
CN27
CN24
CN11 CN5 CN52 CN54
CN12
CN15
CN9
CN8
CN22
(vertical)
CN2
3
(Level)
CN2
1
(vertical)
EARTH
POWER IN
U
E
L
B
R
E
D
L1 L2
/
G
Y
GM
GM
GM
T2B
U
E
L
B
T2A
WHITE
T1/T0
D
E
R
Display board
To wired controller
comm. bus
H A
H B
U
E
L
B
E
T
I
H
W
CN51
CN50
CN51
ACB interface
FAN CTON HTON AUXH
ON/OFF
SWITCH
FM
PUMP
EEV
CS
FM
1
P
X
X
2
P
X
3
P
X
4
P
X
7
P
X
8
P
1
S
X
X
2
S
X
3
S
X
4
S
XT2
( Current range: 0-1A)
( Voltage range: 0-24V AC/DC)
ENC2
FANB
FANA
To outdoor/indoor/MDC
units comm. bus
ENC1
CN14
Occupancy sensor/ON-OFF
(Dry contact)
P
Q
P
Q
XT1
ALARM
“ +5V GND +12V ”
ONLY USED
FOR TESTING
LEGEND
NOTE: Field wiring must use copper conductors only.
ACB
—
Auxiliary Control Board
ALARM —
Warning Lamp
AUXH
—
Output for Auxiliary Heat
CS
—
Condensate Switch
CTON
—
Output for Cooling Operation
EEV
—
Electronic Expansion Valve
FAN
—
DC Indoor Fan
FM
—
Fan Motor
GM
—
Swing Motor
HTON
—
Output For Heating Operation
PUMP
—
Pump Motor
T1/T0
—
Room Temp. Sensor
T2A
—
Inlet Pipe Temp. Sensor
T2B
—
Outlet Pipe Temp. Sensor
XP1-8
—
Connectors
XS1-4
—
Connectors
XT1-2
—
Terminal
---------- —
Optional Component or Field Wiring
Summary of Contents for 40VMU012 Series
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