02/04/2014 10
NI804
The sensor has polarity, is sensitive to wrong voltage, must be protected from static voltage, etc. Do not
cross connect or inadvertently short out sensor wires with power on. Permanent destruct damage may
result.
Electric Furnace Control –
Inside View, Right Board
There are several room thermostat and outdoor unit possibilities.
Pick
the following paragraph which
relates to your installation.
Room Thermostat, Air Conditioning
Use conventional heat/cool, 1H/1C, thermostat. It can be mechanical, digital, power robbing, battery
operated, setback, etc. If mechanical, set the heat anticipator to 0.2.
Connect the standard R, W, G, Y stat terminals to the control board
HEAT/COOL
terminal block with
the same letters.
Room Thermostat, 2-Speed Air Conditioning
Use conventional heat/cool, 2H/2C, thermostat. It can be mechanical, digital, power robbing, battery
operated, setback, etc. If mechanical, set the heat anticipator to 0.2.
Connect the R, W, G stat terminals to the control board
HEAT/COOL
terminal block with the same
letters.
Connect the Y1 stat terminal to the control board Y1 tab. Connect the Y2 stat terminal to the control
board Y/Y2 screw terminal.
The room thermostat W2 is not used or connected.
Outdoor Unit, Air Conditioning
Connect the outdoor unit 2 wires to the control board Y/Y2 and C. If 2-speed A/C, there will be a third
wire connected to the tab Y1.
Cooling, Special Dehumidification
The BK tab and the BK peg jumper provide the industry standard 12% blower speed reduction to “pull
out” additional moisture from the air. Provide an external humidistat between BK and R and pull or
permanently disconnect the BK jumper. With the BK terminal at 0 volts the 12% blower speed reduction
is activated.
Make-Up Air Hookup
In its simplest form, this unit turns on and off with a contact closure across R and Y (T3).
This “on and off” control contact applied across R and Y depends upon installation
requirements and can take on several possibilities – end switch within inlet damper, pressure
differential switch, current level detection switch, relay across exhaust blower motor, end
switch associated with exhaust damper/motor, etc. See Optional Control Devices.
Utility Load Control
If applicable for your installation and your utility authorized electric rate, at the bottom of the control
board is a blue wire jumper. Simply remove this jumper and extend the two tabs to the power company
receiver having N.C. logic.
If opposite control logic is required contact factory for other wiring instructions.
