Step 6 - Position And Connect Controller; Control Wiring - Carrier 40VMU012 Installation And Maintenance Instructions Manual

To wired controller
comm. bus
Occupancy sensor/ON-OFF
(Dry contact)
Display board
EEV
LEGEND
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
NOTE: Field wiring must use copper conductors only.
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.
X 7 P
P
Q
To outdoor/indoor/MDC
units comm. bus
P
Q
XT2
W I H E T
L B U E
X 4 S X 4 P
CN14
T2B
X 3 S X 3 P
R D E
WHITE
T1/T0
X 2 S X 2 P
L B U E
T2A
X 1 S X 1 P
GM
CN1
GM GM
XT1
L1 L2
POWER IN
Fig. 15 — 40VMU012-048 Typical Wiring Diagram
ACB interface
CN50
X 8 P
CS
ON/OFF
SWITCH
CN51 CN51
FAN CTON HTON AUXH
( Current range: 0-1A)
( Voltage range: 0-24V AC/DC)
" +5V GND +12V "
ONLY USED
FOR TESTING
CN12 CN11 CN5 CN52 CN54
ENC1 ENC2
SW8
1
Main Board
EARTH
CN3 CN18
ALARM
• 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.
9
FANB
FM
FANA
FM
CN27 CN24
PUMP