Carrier 40VMU012 Series, Installation And Maintenance Instructions Manual

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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