40MUAA: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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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.
A220802
Fig. 47 —Indoor Unit Power Wiring
NOTE:
The electric auxiliary heat wiring diagram is supplied with the
accessories. Paste the wiring diagram in the designated position after
installing the heat modules.
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.
A220826
Fig. 48 —Controls and Power Terminals on Indoor Unit
(All Sizes)
WIRING REQUIREMENTS
Size all wires per the NEC (National Electrical Code) or CEC (Canadian
Electrical Code) and local codes. Use the electrical data from the outdoor unit
(MCA - minimum circuit amps and MOCP - maximum over current protection),
to correctly size the wires and the disconnect fuse or breakers respectively.
Communication Wiring:
There are two options available to establish
communication between the outdoor unit and approved indoor unit.
Table 10 — Options for Establishing Communication
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.
CAUTION
OPTIONS
COMMUNICATION TYPE
RECOMMENDED CABLE SIZE
1
Non-Polarity RS485
Communication (S1 - S2)
16 AWG (stranded shielded)
2
24V communication
18 AWG 8 conductor thermostat
wire
Refer to the wiring template for the wiring method.
DO NOT
connect the power cord to the communication line as
this may damage the system.
WARNING
EQUIPMENT DAMAGE HAZARD
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 a 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 located within sight and
readily accessible from the system. Route the connecting cable with
conduit through the hole in the conduit panel.
CAUTION
