Preferred
TM
Model PF845411/PF845412
I n s t a l l a t i o n , O p e r a t i o n , & M a i n t e n a n c e M a n u a l
7
Preferred Products
Figure 7
4.4.1 Wiring Model PF845411(without water saving controls)
Wiring the high voltage portion of the unit:
Plug line cord into a source of 120 VAC electrical power. Pro-
vide means of overload protection as required.
VALVE
SOLENOID
HUMIDISTAT
MANUAL
SWITCH
AIR PROVING
24 VAC
R1
TRANSFORMER
120 VAC
LINE CORD
HUMIDIFIER
120 VAC
Figure 8
Wiring the low voltage portion of the unit:
Refer to Figure 8. Air proving switch (not provided) is optional.
4.4.2 Wiring Model PF845412(water saving contol equipped
model)
The PF845412 is equipped with a circuit board that controls
how the fan and water valve are powered. Figure 9 shows the
main parts of the board. The wiring diagram is shown in figure
10. Refer to the wiring notes shown after Figure 10 for board
wiring/control configurations that explain how to set the board
based upon the type of system it is being installed on. These
recommendations will provide the best performance and water
savings.
LINE CORD
TERMINALS
LOW VOLTAGE
TERMINALS
DIP SWITCHES
MOTOR
CONNECTOR
RESET
BUTTON
THERMISTOR
CONNECTORS
LED
VALVE
CONNECTOR
Figure 9
Wiring the high voltage portion of the unit:
Plug line cord into a source of 120 VAC electrical power. Pro-
vide means of overload protection as required.
SOLENOID
VALVE
YEL
YEL
BLK
WHT
GRN
MOTOR
DUCT THERMISTOR
UNIT THERMISTOR
MANUAL
HUMIDISTAT
SWITCH
AIR PROVING
HUMIDISTAT
ELECTRONIC
OR
TERMINALS. SEE
FROM SYSTEM
WIRING NOTES
LINE CORD
120 VAC
TERMINALS. SEE
TO SYSTEM
WIRING NOTES
Figure 10
Wiring the low voltage portion of the unit:
The source of 24 VAC (low voltage) comes from the HVAC sys-
tem terminals. The typical terminal designators are used, such
as R, C, G, W, etc. The following list identifies the low voltage
terminals and their respective connection.
•
R = 24 VAC from the HVAC system
•
C= 24 VAC common from the HVAC system
•
Hr = 24 VAC output for powering the electronic humidistat
(if equipped)
•
Hc = 24 VAC common for the electronic humidistat (if
equipped)
•
H = Humidistat input (must be 24 VAC)
•
W/G = Input from HVAC system. This is used when
the humidifier is used with warm air furnaces. See DIP
switch settings in section 5.
•
AP1/AP2 = Air proving switch is connected here. Do not
apply voltage.
•
Go = 24 VAC output may be used to energize a relay or
connected back to the thermostat “G” terminal to turn on
the HVAC fan. Thermostat functionality may vary and
affect the operation of this output.
Wiring Notes (PF845412 only):
When installing the PF845412 on a furnace system, the
humidifier may operate only when there is a call-for-heat OR
the humidifier may be configured to start the HVAC blower
whenever there is a call-for-humidity.
Single Stage Furnace: Humidifier operates upon call-for-
humidity only during a call-for-heat.
•
DIP Switch #3: On