Harman PP38+ Electric Heater User Manual


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23
PP38+ Pellet Stove 3-90-08422R27_09/12
Maintenance - Cleaning the Feeder Body
Pelletnesmayaccumulateinthefeederbodyover
a period of time; therefore, a yearly inspection and
cleaning of this area must be performed.
Tocleanoutnes:
1. Remove the rear cover panels.
2. Remove wing nut and feeder cover on the
side of the feeder.
3.Useavacuumcleanertoremoveallnes.
4. Reinstall feed cover, wing nut, and rear
cover panels.
5/16" Hex Head
Screws (2 on
each side)
5/16" Hex Head
Screws (2 on
each side)
Safety Features
Thelowdraftsensorwhichisavacuumdifferentialswitch,monitorsthenegativepressure(draft)intherebox
through a port on the rear of the feeder. Poor draft will result in an interruption of power to the feeder motor. Poor
draft can be caused by blockage in the exhaust, excessive build-up on the combustion blower fan blades, a failed
combustionblower,oradoororotheropeningtothereboxnotsealedproperly.Thehopperlidpositionswitch,
located in the right rear corner of the hopper opening, will also interrupt power to the feeder if the hopper lid is not
closed properly. The circuit board is monitoring the position of these switches. During a feed cycle, if either of these
switches were to open, the feed motor light on the control will stay illuminated with the power being interrupted
by the switch. If the switch opens when the cycle is at rest, the power light for the feed motor will not illuminate.
Be sure all doors, including the hopper lid, are securely closed when operating the appliance.
Hopper Lid
Position Switch
Pellet Fines may
build up in this
area
Low
Draft
Sensor
Air
Intake
Flapper
Fig. 39
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