10/04/2007 10
NI802
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.
Room Thermostat, Heat Pump Single Stage
You must use a basic HP stat with built-in reversing valve function. Typically this will be 6 wires. A
conventional heat/cool (4-wire) thermostat will not work when using a heat pump.
The R and C for the HP thermostat is picked up at the bottom spare 24VAC and COM tabs. The O, G, E,
Y connections are made on the left side bracketed area “HP”.
Outdoor HP Unit (Single Stage)
Typically this unit will have either 4 or 5 wires. The main 4 wires are connected to the screw terminal
block R, Y/2, RV, C. The RV can either be the O or the B wire within the outdoor unit.
If the HP outdoor unit has a 5
th
wire for defrost auxiliary heating, connect this 5
th
wire to the WF (W1)
tab.
Two-Speed Heat Pump and/or Multi-Wire Heat Pump Thermostat
Add optional interface controller WF-HP2. In this case all room thermostat and outdoor unit hookup is
from the WF-HP2. The HP2 furnace TB connects to this unit stat TB. Use H/C TB and pin jumpers and
R, C, Y1, Y2.
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.