18-GD07D1-5
5
Installer’s Guide
G. ELECTRICAL — POWER WIRING
1. These Air Handlers are shipped from the factory
wired for 230 volts. The units may be wired for 208
volts. Follow instructions on unit wiring diagram
located on blower housing and in the Service Facts
document included with the unit.
2. The selection of wire and fuse sizes should be made
according to the Minimum Branch Circuit Ampac-
ity and the Maximum Overcurrent Device listed on
the unit nameplate.
3. Field wiring diagrams for electric heaters and unit
accessories are shipped with the accessory.
4. Wiring must conform to National and Local codes.
Ground unit per Local codes with good safety pro-
cedures.
If an electric heater is not installed, the Knockout Plate
provided in the Accessory Kit MUST be installed on the air
handler and the conduit terminated to it. The electrical
connections are made using the two power leads and ground
wire connections which are located near the discharge of the
blower.
2/4TGB AIR HANDLERS WITH SINGLE STAGE COOLING, 1 STAGE HEAT
NOTE:
If air handler is used with or without a heater, the
7/8" electrical entry hole as well as any other cabi-
net penetrations must be sealed air tight.
H. CONTROL WIRING
1. Connect wiring between indoor unit, outdoor unit
and thermostat. The use of color-coded low-voltage
wires is recommended.
2. Field wiring diagrams are provided which show the
low voltage wiring hookup for a single speed cool-
ing only system (with supplementary heaters) and
a heat pump system (with supplementary heaters).
Plug in type electrical connectors are provided for
use with supplementary heaters.
IMPORTANT:
When supplementary heaters are installed, inspect to in-
sure that all packaging material has been removed.
NOTE:
Direct drive motors have bearings which are per-
manently lubri cated and under normal use lubri-
cation is not recommended.
Convertible duct flanges are provided to make a “flush fit” for ¾” or 1-1/2” ductboard applications. 3 are located in the accessory kit shipped
with the unit and 1 is installed on the discharge opening. If the duct flanges are not needed, the installed flange must be removed. See the Outline
drawing for sizes of the discharge opening. After ductwork is secured, seal the ductwork per local and national codes to prevent air loss/infiltra-
tion.
