Harman® • PF-120 Installation Manual_R1 • 2014 -___ • 03/14
24
3-90-08121i
WHITE SP
ARE
RED
VIOLET
4" SQUARE JUNCTION BOX
WHITE
VIOLET
SKY BLUE
WHITE
WHITE
VIOLET
RED
WHITE
SKY
BLUE
WHITE
VIOLET
VIOLET
GROUND
WHITE
VIOLET
VIOLET
VIOLET
BLACK
BLACK
RED
WHITE
VIOLET
YELLOW
Tape Of
f the remaining wires
(BROWN & RED/YELLOW
TRACER)
N.C.
N.O.
TO FAN CONTROL
TO FAN MOTOR
120VAC 60 Hz
24 VAC
FROM THE CIRCUIT
BREAKER J-BOX
SPLICE
THE SIZE OF THESE WIRENUTS
WILL NEED TO BE CHANGED TO
ACCEPT THE ADDED WIRES
Double Pole- Double Throw
Fan Control Relay
THE ORIGINAL SKY BLUE / SKY BLUE
SPLICE WILL NEED TO BE SPLIT TO
MAKE THESE NEW CONNECTIONS
DO NOT DISCONNECT THIS SPLICE
A WHITE SPARE IS PROVIDED FOR
A TRANSFORMERHOOK-UP
F. Adding Air Conditioning
An easy rule of thumb for A/C CFM blower size is, .75 to 1 CFM for each square foot of conditioned space. (standard 8’
ceiling height)
This furnace can be fitted with an air conditioning coil mounted in the supply air plenum.
HHT is not responsible for sizing, duct placement, or interconnections. However we have made adding A/C to the furnace
easier with the information listed below.
There is a factory installed junction box ready to accept your A/C relay. The A/C fan control center with 40 va transformer
must have a DPDT relay. White Rodgers # 90-112, part # 3-20-38056 is available. Other brands are also acceptable for use.
The wiring should be done as per the wiring diagram below. The low voltage wiring to the outside condensing unit and the
cooling thermostat are not shown. See condensing unit diagrams for that information.
This style of relay is used to lock out the feeder system of the pellet furnace when the A/C unit is calling for cooling. This is
a fail-safe against both units operating at the same time.
