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Step 8 - 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.
INDOOR UNIT WIRING
Use the following steps to wire the indoor unit.
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.
16
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.
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.
Fig. 53 — 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. 54 — Wiring Connection of Electric Heater
Specifications subject to change without notice.
Control Box
Wiring Diagram
CAUTION
L1 L2 S
Pass the belt through the hole
of the ferrite core
to secure it to the cable
Fig. 52 — Ferrite Core (Magnetic Ring)
Circuit Breaker
(purchased separately)
(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)
(Magnetic Ring)
IM-40MBAA-02
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