Harman PF-120 - Fan;High Limit Control

Harman® • PF-120 Installation Manual_R1 • 2014 -___ • 03/1425
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exandwiring.
3. Makesurethattheueventingwillnotinterferewiththe
extotheFanControl.
4. PryoutoneofthebottomknockoutsoftheFanControl.
Installthe90°degreeex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