10
2.9 Electrical Installation
CAUTION
Installations must be in accordance with the requirements of authorities having
jurisdiction. Do not cut holes in the floor of outdoor model duct furnaces as the
bottom of the duct furnace has been made waterproof. Wiring diagrams are included
in the control cabinet of the duct furnace. The power requirements are indicated on
the duct furnace rating plate. Authorities having jurisdiction should be consulted
before installations are made.
Installation may be in accordance with applicable standards including;
The Canadian Electrical Code Part 1 - CSA Standard C22.1
National Electric Code in USA, (ANSI / NFPA 70)
1. Field wiring is indicated on the wiring diagram, typically dashed lines. Where field wiring
of the control circuit is required, take care to size the field wiring for a maximum 10%
voltage drop. The VA rating of the transformer can be assumed to be the maximum
load.
2.
Reconnect all disconnected wiring on the duct furnaces that were split for shipment.
3.
When connecting a power supply to a three-phase motor, take care that the three-
phase wiring gives you the correct motor and blower rotation on all motors.
4.
Should any original wire supplied with the furnace have to be replaced, it must be
replaced with wiring material having a temperature rating of at least 105
°
C. See field-
wiring diagram for requirements for shielded or twisted wire.
5.
Temperature controllers, limit controllers, remote selector switches, remote panels, door
switches, or any other auxiliary electrical item shall be connected to the terminals
provided, as shown on the wiring diagram.
6. If a space thermostat is used with the furnace, locate the thermostat so that cold drafts
and hot discharge air streams do not affect its performance. Do not mount the
thermostat on the casing of the duct furnace, or any other location where it may be
affected by radiated and conducted heat. Refer to the instruction furnished with the
thermostat for further details.