York International P3HMX12F08001, Руководство по установке

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17
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 cool-
ing 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
Terminal on
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 termi-
nal and the terminal. The continuous low
speed fan operation operates at 115 vac.
Use appropriate wiring methods to pre-
vent electrical shock.
TURN OFF ELECTRICAL POWER TO
THE FURNACE WHEN SERVICING OR
ALTERING FURNACE WIRING.
FAILURE TO DO SO MAY RESULT IN
SEVERE PERSONAL INJURY, PROP-
ERTY 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 heat-
ing or cooling speeds are activated.
Power is not provided when the continu-
ous 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 air cleaner at the continu-
ous 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 HEATING CONNEC-
TIONS:
The thermostat connections “R” and “W”
connect to the “R” and “W” screw termi-
nals on the EFTB located in the control
box mounted on the blower.
NOTE: All thermostat wires for both
heating and cooling connect to the fur-
nace at the electronic fan timer board. A
factory installed wiring harness connects
the heating control functions to the
R7184 oil primary control.