Wiring Notes - Nordyne O4HD-091A-12-FA Installation Instructions Manual

WIRING NOTES

CONTINUOUS FAN OPERATION
The EFTB (Electronic Fan Timer Board)
has provisions to run the blower motor
continuously on a speed lower than the
cooling or heating speeds. On a call for
cooling, the fan motor will switch to
cooling speed, and on a call for heating,
the fan will switch to heating speed, each
over-riding the continuous low speed fan.
To obtain continuous low speed fan,
route a 16 gauge stranded, type TEW,
105°C wire from the C
ONT
the EFTB to the low speed or medium
low speed motor terminal. Both wire
ends will require ¼ inch quick connects,
(also known as "Faston" connectors or
¼" spade connectors). For additional
control over the continuous low speed
fan circuit, a SPST toggle switch may be
wired in series between the motor
terminal and the terminal.
continuous low speed fan operation
operates at 115 vac. Use appropriate
wiring methods to prevent electrical
shock.
TURN OFF ELECTRICAL POWER TO
THE FURNACE WHEN SERVICING OR
ALTERING FURNACE WIRING.
FAILURE TO DO SO MAY RESULT IN
SEVERE PERSONAL
PROPERTY DAMAGE OR DEATH.
ACCESSORIES:
The EFTB has provisions for supplying
115-volt power to an electronic air
cleaner (EAC) as well as 115 volts to a
line voltage humidifier or humidifier step
down transformer. Both sets of terminals
are ¼ inch quick connect type, rated at 1
A each.
The EAC terminals provide power to an
electronic air cleaner whenever the
heating or cooling speeds are activated.
Power is not provided
continuous speed is activated. If the
electronic air cleaner must run during
continuous low speed fan operation, wire
the EAC into the furnace L1 terminal.
NOTE: It is seldom advisable to operate
an electronic
:
continuous low speed because of the
potential for excess ozone generation.
The HUM terminals provide power to a
line voltage humidifier or humidifier step
down transformer when the oil burner
motor is operating.
THERMOSTAT
CONNECTIONS:
The thermostat connections "R" and "W"
connect to the "R" and "W" screw
terminals on the EFTB located in the
Terminal on
control box mounted on the blower.
NOTE: All thermostat wires for both
heating and cooling connect to the
furnace at the electronic fan timer board.
A factory
connects the heating control functions to
the R7184 oil primary control.
The
INJURY,
when the
air cleaner at the
HEATING
installed wiring harness
17 151B0801 R5 3/28/2006