Install Manual

04/03/2009 9 EI204
Electrical Installation Overview
WARNING
TO AVOID THE RISK OF ELECTRIC SHOCK OR DEATH, WIRING TO THE UNIT MUST BE
PROPERLY GROUNDED. FAILURE TO PROPERLY GROUND THE UNIT CAN RESULT IN A
HAZARD LEADING TO PERSONAL INJURY OR DEATH.
Line Voltage
The nameplate and/or Installation and Operating Manual specification page provides kW rating and operating
current requirements for each specific model. Select the proper wire size to comply with your type of wire
routing and NEC field wiring requirements.
Field connection is at this product’s furnished circuit breaker. This integrated circuit breaker is a proper local
disconnect.
WARNING
USE ONLY COPPER WIRE FOR CONNECTION TO THE CIRCUIT BREAKER TERMINALS
AND INSIDE THIS PRODUCT’S CABINET.
If the 240 power service is to be wired as single feed, order option circuit breaker single feed bus bar, part
number 5701 (2 circuit breaker), 5702 (3 circuit breaker).
WARNING
DISCONNECT ALL ELECTRICAL POWER BEFORE ELECTRICALLY CONNECTING OR
SERVICING THE UNIT. FAILURE TO DISCONNECT THE ELECTRICAL POWER BEFORE
WORKING ON THIS PRODUCT CAN CREATE A HAZARD LEADING TO PERSONAL INJURY
OR DEATH.
Note: All heat/cool functions for this dual heat system originate from a standard 4-wire (heat/cool) room
thermostat. Do not install with a 2-stage heat/1-stage cool or a heat pump room thermostat. Also do not
install using two individual thermostats.
Control Wiring – (reference figure 4) – this section assumes gas or oil furnace has an appropriate fan center or
appropriate equivalent wiring terminals with 40VA or larger integral transformer and blower relay with “G”
function. Use only a basic four wire heat/ cool type thermostat.
Blower Control – this is handled within the 4 (or 5) wire connection between the HeatChoice control board
bottom and the gas furnace hookup. The HeatChoice control board allows the blower to turn off and operate
under the control of the gas furnace during standby or utility interrupt. During cooling the control board logic
keeps the blower running during utility air conditioning interrupt to circulate summer air.
a. Delay on/off – within the control board logic, the blower turns on with an approximately 10
second delay. At the end of the thermostat heat cycle, the blower will continue to operate for 60
seconds to cool off the HeatChoice metal rod electric elements.
b. LMC Purge cycles – there is a 60 second delay before allowing a gas furnace W input in order
to allow the furnace blower to cool off the HeatChoice elements. There is also a 3 minute delay
before allowing the electric elements to turn back on after the gas furnace has been on.
c. Thermostat “G” function – do not connect the thermostat G wire directly to the gas furnace G
screw. The thermostat G wire must pass through the HeatChoice control module from top point
to the bottom point.