Service Manual

PRODUCT DESIGN

ELECTRICAL WIRING

The units are designed for operation at the voltages and fre-

quency as shown on the rating plate. All internal wiring is com-

plete. Ensure the power supply to the compressor contactor is

brought to the unit as shown on the supplied unit wiring dia-

gram. The 24V wiring must be connected between the unit

control panel and the room thermostat.

WARNING

TO AVOID PERSONAL INJURY OR DEATH DUE TO

ELECTRIC SHOCK, WIRING TO THE UNIT MUST BE

PROPERLY POLARIZED AND GROUNDED.

WARNING

TO AVOID THE RISK OF PROPERTY DAMAGE,

PERSONAL INJURY OR FIRE, USE ONLY COPPER

CONDUCTORS.

LINE VOLTAGE WIRING

Power supply to the unit must be N.E.C. Class 1, and must

comply with all applicable codes. The unit must be electrically

grounded in accordance with the local codes or, in their ab-

sence, with the latest edition of the National Electrical Code,

ANSI/NFPA No. 70, or in Canada, Canadian Electrical Code,

C22.1, Part 1. A fused disconnected must be provided and sized

in accordance with the unit minimum circuit ampacity.

The best protection for the wiring is the smallest fuse or breaker

which will hold the equipment on line during normal operation

without nuisance trips. Such a device will provide maximum

circuit protection.

WARNING

DO NOT EXCEED THE MAXIMUM OVERCURRENT

DEVICE SIZE SHOWN ON THE UNIT DATA PLATE.

All line voltage connections must be made through weather proof

fittings. All exterior power supply and ground wiring must be in

approved weather proof conduit. Low voltage wiring from the unit

control panel to the thermostat requires coded cable.

The unit transformer is connected for 230V operation. If the

unit is to operate on 208V, reconnect the transformer primary

lead as shown on the unit wiring diagram.

If it is necessary for the installer to supply additional line volt-

age wiring to the inside of the package unit, the wiring must

comply with all local codes. This wiring must have a minimum

temperature rating of 105°C. All line voltage splices must be

made inside the unit or heat kit control box.