System Requirements; Wiring - Carrier 40MBDQ09 3 Series Installation Instructions Manual

SYSTEM REQUIREMENTS

Allow sufficient space for airflow and servicing unit. See Fig. 6 for minimum required distances between the unit and the walls or ceilings.
Piping
IMPORTANT: Both refrigerant lines must be insulated separately.
S Minimum refrigerant line length between the indoor and outdoor units is 10 ft. (3 m).
S Table 3 lists the pipe sizes for the indoor unit. Refer to the outdoor unit installation instructions for other allowed piping lengths and
refrigerant information.
Gas Pipe (size-connection type)
Liquid Pipe (size-connection type)

WIRING

All wires must be sized per NEC (National Electrical Code) or
CEC (Canadian Electrical Code) and local codes. Use Electrical
Data table MCA (minimum circuit amps) and MOCP (maximum
over current protection) to correctly size the wires and the
disconnect fuse or breakers respectively.
Sizes 09−24 Recommended Connection Method
for Power and Communication Wiring
Power and Communication Wiring:
The main power is supplied to the outdoor unit. The field supplied
14/3 power/communication wiring from the outdoor unit to the
indoor unit consists of four (4) wires and provides the power for
the indoor unit. Two wires are high voltage AC power, one is
communication wiring and the other is a ground wire.
To minimize communication interference: If installed in a high
Electromagnetic field (EMF) area and communication issues exist,
a 14/2 stranded shielded wire can be used to replace L2 and (S)
between outdoor unit and indoor unit − landing the shield onto
ground in the outdoor unit only.
Sizes 36−58 Recommended Connection Method for
Power and Communication Wiring
Power and Communication Wiring:
The main power is supplied to the outdoor unit. The field supplied
power wiring from the outdoor unit to the indoor unit consists of
three (3) wires and provides the power for the indoor unit. Two
wires are high voltage AC power and one is a ground wire. To
minimize voltage drop, the factory recommended wire size is 14/2
stranded with a ground.
Communication Wiring:
A separate shielded stranded copper conductor only, with a 600
volt rating and double insulated copper wire, must be used as the
communication wire from the outdoor unit to the indoor unit.
Please use a separate shielded 16GA stranded control wire.
Table 3 – Piping Lengths
9K 12K
In. 3/8 1/2
(mm) (9.52) (12.7)
In 1/4 1/4
(mm) (6.35) (6.35)
18K 24K
1/2 5/8
(12.7) (16)
1/4 3/8
(6.35) (9.52)
CAUTION
!
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Wires should be sized based on NEC and local codes.
CAUTION
CAUTION
!
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage
or improper operation.
Be sure to comply with local codes while running wire from
the indoor unit to the outdoor unit.
Every wire must be connected firmly. Loose wiring may cause
the terminal to overheat or result in unit malfunction. A fire
hazard may also exist. Ensure all wiring is tightly connected.
No wire should touch the refrigerant tubing, compressor or
any moving parts.
Disconnecting means must be provided and shall be located
within sight and readily accessible from the air conditioner.
Connecting cable with conduit shall be routed through the
hole in the conduit panel.
4
36K 48K 58K
5/8 5/8 3/4
(16) (16) (19)
3/8 3/8 3/8
(9.52)) (9.52) (9.52)