Harman® • P-Series Owner’s Manual_R10 • 2014 - ___ • 11/1525 3-90-436168c
The Low Draft Pressure Switchisadifferentialpressureswitch
that monitors the negative pressure (Draft) in the rebox. If the
draftbecomestoo low forpropercombustion,the switch opens,
cuttingpowertothefeedmotorandtheignitercircuits.Thisswitch
isconnectedintotheAC(highvoltage)wiring.
The Control Board/ESP combination is responsible for all high
limitsafetycontrol.Thereare2highlimits,onenormaloperation
highlimitandonebackuphighlimit.Thecontrolhasanautomatic
diagnosticcircuitthatcontinuouslymonitorstheESPand Room
Sensorforfaults.Ifafaultshouldoccur,thecontrolsendsastatus
alertandatthesametimetheunitgoesdowntominimumfeed/
minimumburnasasafetycondition.
Backdraft Damper Assembly
Always check to see if the damper
plate swings freely inward and that
the seating edges are not covered
withdirtorlint.
Low Draft Pressure Switch
Feed Motor
Combustion Motor
B. Motor and Component Location
P-Series Pellet Stove Safety Devices
Distribution Blower