Harman PF-120 - Installing Electrical Power

Harman® • PF-120 Installation Manual_R1 • 2014 -___ • 03/1426
3-90-08121i
H. Installing Electrical Power
Toinstallpowertothefurnacerstremovethecoveronthe
circuitbreakerjunctionbox.Figure5.18.
Insideyouwillnd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rebox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