GPH14M Service Manual

PRODUCT DESIGN
16
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.