Harman PP38+ - Manual (Page 23)

23 PP38+ Pellet Stove 3-90-08422R33_06/13
Maintenance - cleaning the Feeder body
Pellet fines 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 fines:
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 fines.
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 firebox 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 firebox not sealed properly. The circuit board is monitoring the position of this switch. During a feed
cycle, if this switch 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.
Pellet Fines may
build up in this
area
Low Draft
Sensor
Air Intake
Flapper Fig. 39