Harman® • PF-120 Installation Manual_R1 • 2014 -___ • 03/14
21
3-90-08121i
C. Firebrick installation-required
The firebrick is shipped in the ash pan. It will need to be
placed on the brick shelf Figure 5.12. It can be installed with
either face to the fire. Hold the brick longways and slide it
down into the slot on the shelf. There is a stop at the rear of
the shelf to stop the rearward travel. The brick just sits on
the shelf in the upright position.
Firebrick
Figure 5.12
D. wall Control
The Wall Control (Figure 5.13) sends and receives information
from the control board through a 4 wire Datacom cable. There
is a 100’ length of this cable supplied with the furnace. 100’
lengths of this cable can also be ordered separately, part #3-
20-02583. Alternately, any Datacom cable -CAT3- 2 twisted
pair 24ga solid wire can be acquired at a local electrical
supply house. Also any CAT3-24ga. solid wire 2, 3, or 4 pair
cable can be used because they all have the same pair color
combinations. The maximum length of wall control wiring is
100 feet.
The furnace connecting point is a 4 pole screw terminal block
on the side of the hopper just around the corner to the right
of the control. Follow the wiring instructions on the label
alongside the terminal block Figure 5.14.
Figure 5.14
+
-
TH
TH
Orange
Blue
White-Orange
White-Blue
This section is not used on this unit
CAUTION
!
With this small gauge of wire, care must be taken not to
over-tighten the terminal screws thus, breaking the wire.
There are tie-wrap holes in the face of the hopper
approximately every 6” to keep the cable secure and out of
the way.
The Wall Control is made to fit on a standard wall case
electrical box. It could also be mounted directly to a stud
using 2 drywall screws. In either case the screws should be
turned in and tested for a snug fit when the Wall Control is
slid down over the screws. The Wall Control only hangs on
the screws so a good fit is important.
Remove the Wall Control and make the Datacom cable
connections with the UY auto splicers provided.
DO NOT
STRIP THE wIRES
. Following the wiring diagram on the
inside of the Wall Control make each splice. See Figure 5.14.
Insert the two matching color wires fully into the two holes of
one of the UY connectors. A pair of standard Channel-lock
pliers works ideally to squeeze the raised button down into the
UY connector body. Extra UY connectors can be purchased.
Part # 3-20-00200
NOTE:
A pair of needle nose pliers may be helpful to insert
the BLUE T-stat wires fully into the connector. Visually inspect
to see that the wires are fully inserted before squeezing the
UY splicer.
Figure 5.13
LOW
FUEL
70
75
65
60
80
Datacom Cable
wall Control
Orange -
Red
(+ LED)
Blue/White-
Blue
(Tstat)
Orange/White-
White or Blk (- LED)
Blue-
Blue
(Tstat)
