14
The integrated control module humidifier terminal 120V
HUM-H is energized with 115 volts whenever the induced
draft blower is energized. This terminal can also be used to
provide 115 volt power to a humidifier transformer. The re
-
maining primary transformer wire would be connected to the
Line N on the control board. The integrated control module
electronic air cleaner terminals EAC-H is energized with 115
volts whenever the circulator blower is energized.
NOTE: Wire routing must not interfere with circu
-
lator blower operation, filter removal, or routine
maintenance.
PCBBF145
CONTROL BOARD
EAC-H
120 HUM-H
EAC-N
120V HUM-N
115 VAC EAC
115 VAC HUM
Connecting Line Voltage Accessories
Connection of 24 Volt Humidifier
The integrated control module single humidifier terminal “24
VHUM” is energized with 24 volts whenever the induced draft
blower is energized. Connect the common side of the 24 volt
humidifier to the “C” terminal of the thermostat terminal strip
on the control board.
PCBBF145
Y/Y2 W R G C
24VHUM
24 VOLT HUM. &
HUMIDISTAT
Twinning
Furnaces may be twinned without the use of a twinning
kit. Furnaces must be the same model and equipped with
PCBBF145 control boards. Follow the diagram provided in
this manual. Connection of the “twin” terminals of each con-
trol together will allow simultaneous operation of two or more
furnace indoor blowers to operate synchronously on a com-
mon duct system. Field installed low voltage thermostat wir-
ing, 3/16” terminals are required to make this connection. An
isolating relay (24 VAC coil & N/O SPST) contacts is also re-
quired if the furnaces are not fed from the same line voltage
phase. A pulsing DC signal is used to share the call for fan
operation between furnaces. The duration of the pulse width
determines the speed that the reading control will energize
its blower motor.
CAUTION
To prevent unreliable operation or equipment damage, the
gas manifold pressure must be as specified on the unit rating
plate. Only minor adjustments should be made by adjusting
the gas valve pressure regulator.
WARNING
Possible property damage, personal injury or death may
occur if the correct conversion kits are not installed. The
appropriate kits must be applied to ensure safe and proper
furnace operation. All conversions must be performed by a
qualified installer or service agency.
GAS SUPPLY AND PIPING
The furnace rating plate includes the approved furnace gas
input rating and gas types. The furnace must be equipped to
operate on the type of gas applied. This includes any con-
version kits required for alternate fuels and/or high altitude.
NOTE: Do no remove the gas valve inlet plug be
-
fore the gas line is installed. Replace if water or
debris has been introduced.
CAUTION
To prevent unreliable operation or equipment damage, the
inlet gas supply pressure must be as specified on the unit
rating plate with all other household gas fired appliances
operating.
Inlet gas supply pressures must be maintained within the
ranges specified in the following table. The supply pressure
must be constant and available with all other household gas
fired appliances operating. The minimum gas supply pres
-
sure must be maintained to prevent unreliable ignition. The
maximum must not be exceeded to prevent unit overfiring.
Natural Gas
Minimum: 4.5" w.c.
Maximum: 10.0" w.c.
Propane Gas Minimum: 11.0" w.c. Maximum: 13.0" w.c.
INLET GAS SUPPLY PRESSURE
NOTE: Adjusting the minimum supply pressure
below the limits in the above table could lead to
unreliable ignition. Gas input to the burners must
