Step 6 - Connect The Signal And Power Cables - Carrier 40MAHB Series Installation Instructions Manual

Step 6 - Connect the Signal and Power
Cables
All wires must be sized per NEC (National Electrical Code) or CEC
(Canadian Electrical Code) and local codes. See the rating plate and/
or the installation instructions of the compatible outdoor unit for MCA
(minimum circuit amps) and MOCP (maximum over current
protection) to correctly size the wires and the disconnect fuse or
breakers respectively.
Recommended Connection Method for 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. Wiring between the indoor and
outdoor unit is polarity sensitive. The use of BX wire is NOT
recommended. If installed in a high Electromagnetic field (EMF) area
and communication issues exists, a 14/2 stranded shielded wire can be
used to replace L2/N and (S) between outdoor unit and indoor unit
landing the shield onto ground in the outdoor unit only.
1. Open front panel of the indoor unit.
2. Use a screwdriver to open the wire box cover on the right side of
the unit. This reveals the terminal block.
Fig. 19 — Wire Box Cover
WARNING
All wiring must be performed strictly in accordance with the
wiring diagram located on the back of indoor unit's front panel.
12
NOTE: The wiring connection process may differ slightly between
units and regions.
Terminal block
Wire cover
Screw
Cable clamp
Specifications subject to change without notice.
3. Unscrew the cable clamp, below the terminal block, and place it to
the side.
4. Facing the back of the unit, remove the plastic panel on the bottom
left-hand side.
5. Feed the signal wire through this slot, from the back of the unit to
the front.
6. Facing the front of the unit, connect the wire according to the
indoor wiring diagram, connect the u-lug and firmly screw each
wire to its corresponding terminal.
CAUTION
DO NOT MIX UP LIVE AND NULL WIRES
This is dangerous and can cause the air conditioning unit to
malfunction.
7. After checking to ensure every connection is secure, use the cable
clamp to fasten the signal cable to the unit. Screw the cable clamp
down tightly.
8. Replace the wire cover on the front of the unit, and the plastic panel
on the back.
40MAHB-01SI