Carrier R4A4S - Electrical Connections; Power Wiring to Contactor; Control Wiring Guidelines

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R4A4S, R4A5S: Installation Instructions

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

Make Electrical Connections

Be sure field wiring complies with local and national fire, safety, and

electrical codes, and voltage to system is within limits shown on unit

rating plate. Contact local power company for correction of improper

voltage. See unit rating plate for recommended circuit protection device.

NOTE: Operation of unit on improper line voltage constitutes abuse and

could affect unit reliability. See unit rating plate. Do not install unit in

system where voltage may fluctuate above or below permissible limits.

NOTE: Use copper wire only between disconnect switch and unit.

NOTE: Install branch circuit disconnect of adequate size per NEC to

handle unit starting current. Locate disconnect within sight and readily

accessible from unit, per Section 440-14 of NEC. Refer to Product Data

for breaker sizing.

Route Ground and Power Wires

Remove access panel to gain access to unit wiring. Extend wires from

disconnect through power wiring hole provided and into unit control

box.

Connect Ground and Power Wires

This appliance incorporates an earth connection for safety purposes only.

Connect ground wire to ground connection in control box for safety.

Connect power wiring to contactor as shown in Fig. 6.

A94025

Fig. 6 – Line Connections

Connect Control Wiring

Route 24-v control wires through control wiring grommet and connect

leads to control wiring. Refer to thermostat Installation Instructions for

wiring specific unit combinations (see Fig. 7 ).

Use No. 18 AWG color-coded, insulated (35°C minimum) wire. If

thermostat is located more than 100 ft. (30 m) from unit, as measured

along the control voltage wires, use No. 16 AWG color-coded wire to

avoid excessive voltage drop.

All wiring must be NEC Class 2 and must be separated from incoming

power leads.

Use furnace transformer, fan coil transformer, or accessory transformer

for control power, 24v/40va minimum.

NOTE: Use of available 24v accessories may exceed the minimum 40va

power requirement. Determine total transformer loading and increase

the transformer capacity or split the load with an accessory transformer

as required.

A02326A/A97368

Fig. 7 – Generic Wiring Diagrams (See Thermostat Installation Instruction for specific unit combinations)

WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury or death.

Do not supply power to unit with compressor terminal box cover

removed.

WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury or death.

The unit cabinet must have an uninterrupted or unbroken ground to

minimize personal injury if an electrical fault should occur. The ground

may consist of electrical wire or metal conduit when installed in

accordance with existing electrical codes.

24 VAC HOT

24 VAC COM

W/W1

Y/Y2

A/C

THERMOSTAT

Typical

FAN COIL

AIR

CONDITIONER

HEAT STAGE 1

COOL STAGE 1

INDOOR FAN