Harman® • PF-120 Installation Manual_R1 • 2014 -___ • 03/14
25
3-90-08121i
G. Fan/High Limit Control
1. The Fan Control must be placed in the discharge plenum
approximately 11 inches above the discharge opening of
the furnace, as close to center as possible.
Note:
The best place is on the same side as the ash door
because of ease of access. Figure 5.16.
2. Install the flex and wiring.
3. Make sure that the flue venting will not interfere with the
flex to the Fan Control.
4. Pry out one of the bottom knockouts of the Fan Control.
Install the 90° degree flex connector as shown in Figure
5.17
.
One of the locknuts stay on the outside of the box
and one goes on the inside to tighten the connector into
place. This allows for maximum room for the wires around
the switches.
5.
REMOVE THE COPPER JUMPER BETwEEN THE
LIMIT AND CONTROL SwITCHES. (It is not needed.)
6. Connect the two VIOLET & Black wires to the FAN
CONTROL switch. (It doesn’t matter which wire is on
which screw). Figure 5.17.
7. Connect the WHITE and SKY BLUE wires to the LIMIT
switch. (It doesn’t matter which wire is on which screw).
Figure 5.17.
8. Make sure that all of the wires are out of the way when
closing the cover. (Excess twisting and pinching of the
wires could cause a short circuit.)
9.
HIGH LIMIT
setup: Rotate the high limit pointer clockwise
until it is against the tamper-proof screw. (Never adjust
this screw)
10.
FAN CONTROL
setup: Move furthest left pointer to the
120° position, then move the pointer to the right of it to
the 150° position. Figure 5.17. This is a good starting
point, however, the settings between the 2 pointers may
need to be changed if short cycling occurs.
Note:
This is the best fan control position we have found
during factory testing. These fan control settings can be
adjusted if desired.
NOTE: KEEP THE FAN/LIMIT CONTROL INSTRUCTIONS
wITH THE OwNERS MANUAL FOR FUTURE REFERENCE.
NOTE: If fans are used in the fuel storage area, they
should be installed so as not to create negative pressure
in the room where the solid-fuel-burning appliance is
located.
High limit fan control
High Limit
Set point
Control
Fan Control Set points
Limit
Locknuts outside and inside
Figure 5.16
Figure 5.17
