Step 8 - Filter Drier; Step 9 - Electrical Connections; Indoor Unit Wiring - Carrier 40MUAA Installation Instructions Manual

40MUAA: Installation Instructions

Step 8 - Filter Drier

Refer to Fig. 50 and install the drier as follows:
1. Braze 5" (127 mm) liquid tube to the indoor coil.
2. Wrap filter drier with damp cloth.
3. Braze filter drier to 5" (127 mm) long liquid tube from step 1.
4. Connect and braze liquid refrigerant tube to the filter drier
Fig. 50 —Filter Drier Components
The filter drier must be replaced whenever the refrigeration system is
exposed to the atmosphere.
Only use factory specified liquid-line filter driers with rated working
pressures less than 600 psig.
NOTE: Do not install a suction-line filter drier in liquid line.

Step 9 - Electrical Connections

Before proceeding with electrical connections, make certain that the
supply voltage, frequency, phase, and ampacity are as specified on the
unit rating plate. Review the unit wiring label for proper field high and
low voltage wiring.
Ensure all electrical connections are in accordance with the NEC and any
local codes or ordinances that may apply. Use copper wire only.
CAUTION
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in product or property
damage. If a disconnect switch is to be mounted on the unit, select
a location where the drill or fastener will not contact electrical or
refrigerant components.
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury or
death. Field wires on the line side of the disconnect found in the
fan coil unit remain live, even when the pull-out is removed.
Service and maintenance to incoming wiring cannot be performed
until the main disconnect switch (remote to the unit) is turned off.
CAUTION
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage or
improper operation. Size the wires in accordance with NEC and
local codes.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

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 "Step 3 - Mount Electric Heater
(Optional)" on page 10.
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
A221164
terminal. Refer to the serial number and wiring diagram located on
the cover of the electric control box.
Fig. 51 —Control Box and Wiring Diagram
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.
L1 L2 S
Fig. 52 —Ferrite Core (Magnetic Ring)
20
CAUTION
Pass the belt through the hole
of the ferrite core
(Magnetic Ring
to secure it to the cable
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