Indoor Unit Wiring - Carrier 40MBAB Installation Instructions Manual

40MBAB: Installation Instructions

INDOOR UNIT WIRING

Use the following steps to wire the indoor unit.
NOTE: Wiring in this section is for the base unit ONLY. Auxiliary
Electric Heat wiring is covered in "INDOOR UNIT
WIRING" on page 18.
1. Prepare the cable for connection.
a. Using wire strippers, strip the insulation from both ends of the
signal cable to reveal about 1/2 in (12mm) of wire.
b. Strip the insulation from both ends of the wires.
c. Use a wire crimper to crimp the fork terminals to the ends of
the wires.
2. Open the indoor unit's front panel. Use a screwdriver to remove the
cover of the electric control box on the indoor unit.
3. Thread the power cable and the signal cable through the wire outlet.
4. Connect the fork terminals to the terminals. Match the wire colors/
labels with the labels on the terminal block.
5. Firmly screw the fork terminals of each wire to its corresponding
terminal. Refer to the serial number and wiring diagram located on
the cover of the electric control box.
Fig. 49 —Control Box and Wiring Diagram
CAUTION
While connecting the wires, strictly follow the wiring diagram.
The refrigerant circuit can become very hot.
Keep the interconnection cable away from the copper tube.
6. Clamp down the cable with the cable clamp. The cable must not be
loose or put strain on the fork terminals.
7. Reattach the electric box cover.
The main power is supplied to the outdoor unit. When disconnecting
the power of the outdoor unit, the indoor unit would lose power. A
disconnect switch is not required on the indoor unit side on the
wiring between the outdoor and indoor unit. A 3 pole disconnect
(purchased separately) may be used for extra protection between the
indoor and outdoor unit.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Circuit Breaker
(purchased separately)
Fig. 50 —Wiring Connection of Indoor Unit
The Auxiliary Heater must have a separate branch electric circuit with a
field-supplied disconnect switch located within sight from, and readily
accessible from, the unit.
Fig. 51 —Wiring Connection of Electric Heater
A220791
18
(purchased separately)
3 Pole Disconnect
(purchased separately)
Circuit Breaker
Electrical heater unit power wires
(DO NOT connect to
the indoor unit
Electrical
circuit breaker!)
heater
unit
(optional)
A220820
A220821