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

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 — Indoor Fan Motor
HTON — Output For Heating Operation
PUMP — Pump Motor
T1 — Room Temperature Sensor
T2A — Inlet Pipe Temperature Sensor
T2B — Outlet Pipe Temperature Sensor
XP1-4, — Connectors
XS1-4
XT1-2 — Terminal Block
---------- 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
maintains good temperature control:
• Position the thermostat approximately 48 inches above
floor level.
• Do not position the 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,
dimmer switches, and other electrical devices.
• See Fig. 24 for an example of communication wire
connection.

CONTROL WIRING

1. Use copper core PVC insulated sheathed shielded twisted
wire.
2. For indoor unit and outdoor unit communication, use P,
Q terminals. Shielded core should be used for ground.
XT2
To wired
controller
comm. bus
P
To outdoor/indoor/MDC
Q
units comm. bus
P
Q
EARTH
" +5V GND +12V "
C N3 CN1 8
ONLY USED
FOR TESTING
CN2
CN54
CN24
RED BLUE
LINE
Y/G
FILTER
FM
ALARM
LOAD
BLUE
RED
Y/G
XT1
L1 L2
ON/OFF
PUMP
SWITCH
POWER IN
Fig. 23 — 40VMM012-048 Typical Wiring Diagram
WHITE
BLUE
YELLOW
XP4 XS4
GRAY
CN17 CN9 CN15
Main Board
CN52 CN21 CN12
CN14
CN4
XP2 XP3
XP1
XS3
XS1 XS2
CS
EEV
ACB interface
CN50
CN51
Occupancy
FAN CTON HTON AUXH
sensor/ON-OFF
(Dry contact) (Voltage range: 0-24V AC/DC)
( Current range: 0-1A)
3. Wiring should be run according to the wiring diagram.
4. Communication wire must not form a closed loop.
To outdoor/indoor/MDC units
comm. bus
LEGEND
ACB — Auxiliary Control Board
Fig. 24 — Communication Wire Connection
16
Display Board
ENC2
ON ON
SW1 SW8 ENC1
CN5
CN8
XT2
To wired controller comm. bus