Harman® • PF-120 Installation Manual_R1 • 2014 -___ • 03/14
26
3-90-08121i
H. Installing Electrical Power
To install power to the furnace first remove the cover on the
circuit breaker junction box. Figure 5.18.
Inside you will find the main terminal block. Reference Section
6, Item B “Wiring Diagram” of this manual for location of main
terminal block and proper power connections. In the bottom
of the box a knockout hole is provided for the incoming wire
and bulk hopper relay.
The
minimum
recommended circuit is 15 Amp 120 VAC, 60
Hz. This furnace should be the only appliance on the circuit.
This furnace should never be powered by the use of an
extension cord.
The recommended high and low voltages are, 130 VAC, 60
Hz maximum high voltage, and 113 VAC, 60 Hz minimum
low voltage.
The furnace will continue to operate at voltages as low as 105
VAC, although it can not be guaranteed that automatic ignition
will occur. Also, there is the possibility of a distribution blower
motor overload.
NOTE: If other sources of electrical power are to be
used (such as a generator) for normal operation or
emergency operation, this source should be checked
before installation. Many generators and inverters may not
supply 120 VAC. 60Hz. power stable enough to operate
the control board properly. (Control board damage could
occur).
Checking & Recording the Low Draft:
After the venting is completed, the firebox low draft will need to
be checked and possibly adjusted. After removing the 3/8” bolt
from the draft hole shown in Figure 5.19, insert the draft meter
tube. The inner ash door and the hopper lid must be latched
during this test. ( It is recommended that the draft meter have
a scale of 0 to 1” WC.)
Turn the Feed Adjuster to “Test”. this will start the combustion
blower and allow you to check and record the High Draft
______ - IWC date _______ (There is no adjustment for the
High Draft)
After the first 60 seconds, the “Test” mode lowers the
combustion blower voltage to the Low Burn voltage. During
this lowered voltage cycle the
low burn draft must be
checked
and adjusted if necessary. The recommended low
draft setting should be between -.45 & -.55 IWC. Depending
on the amount of vertical rise, it may not be possible to get a
low draft reading in this range. In this case, a maximum low
draft of -.55 is acceptable.
The adjustment screw is through the small hole to the right
of the Igniter Light. Figure 5.20. Adjusted the Low Draft to
__________ -IWC.
Don’t forget to turn off of “Test” mode.
Figure 5.18
Draft meter bolt
Furnace Control Cover
Figure 5.19
“Test”
Low Draft Adjustment Pot
Figure 5.20
Circuit Breaker Junction Box
