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P38+ Pellet Stove
20
Thermostat Terminals
Trim Pot
Warning
Always disconnect power
before touching control board
What is a thermostat?
A thermostat is a switch that opens or closes at a
set room temperature. For example: When you set the
thermostat to 70 degrees, the switch will be closed caus-
ing the stove to burn on "Turbo" until the room tempera-
ture reaches 70 degrees. Then the switch will open, caus-
ing the stove to go to "low" which is where the feed rate
is set.
Installing Thermostat
The thermostat should be mounted in a central lo-
cation. Avoid isolated rooms with poor air circulation.
Run thermostat wire ( available at most hardware
stores) from the thermostat to the rear of the unit and up
to the thermostat terminals on the control board. discon-
nect power before accessing control board. The con-
trol board can be tilted out at the top to allow access to
the thermostat terminals on the control board. Use the
two female spade terminals (supplied) to make the con-
nection.
Low Draft Adjustment ( cold stove only )
This adjustment should only be made by an autho-
rized Harman dealer using a draft meter to check results.
The Low Draft Adjustment is set at the factory in the mini-
mum position. This setting should give the proper draft
with 118 V.A.C. 60 Hz or higher.
To check the low draft, turn the feed rate dial to "1"
and allow one minute before taking a draft reading. If the
draft is too low (below .15), Disconnect the power and
turn the trim pot on back of the control board clockwise
slightly to increase draft. Reconnect power and wait one
minute before rechecking draft. Repeat until .15 to .18
draft reading is reached.
Thermostat (optional)