HARDY MANUFACTURING CO., INC (MODEL H25) PAGE 25
Section VII 7-2 Temperature Control System
DAMPER THERMOSTAT, Dayton - (WARNING: When working with electrical circuits, use
caution to avoid electrical shock) – This thermostat has a probe that is in a well in the water tank
of the wood heater. It has a set of contacts that open on a temperature rise and close on a temperature
fall. This thermostat is normally set at 170ºF to 180ºF. It controls the damper solenoid and the forced
air draft. If the damper solenoid and forced air draft will not operate, place a jumper wire across the
terminal strip from #4 to #5. If they operate when the correct terminals are jumpered out, and the
temperature of the water in the heater is below the set point on the thermostat, the thermostat is
defective. Do not leave the jumpers across the terminal strip because the heater will overheat.
DAMPER SOLENOID, P/N H 2001.05 - (WARNING: When working with electrical circuits,
use caution to avoid electrical shock) – This solenoid lifts the cover off the intake to the forced air
draft blower. The solenoid is controlled by the damper thermostat. It should lift the cover when the
forced air blower comes on and drop the cover.
FORCED AIR DRAFT BLOWER, P/N H2002.28 - (WARNING: When working with electrical
circuits, use caution to avoid electrical shock) – This blower supplies air to the fire box when the
damper thermostat calls for heat. If the blower wheel or the intake to the blower is clogged, the
blower will not deliver the proper amount of air to the fire. The blower can be disassembled and
cleaned. Be sure to seal the blower motor back to the blower housing if the blower is disassembled.
The motor should be oiled at the beginning of each heating season. When the heater is not in use, the
power cord for the blower should be unplugged.
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2 3 4 5 6 7 8
BM
1
SO L
1
Dayton
Aquastat
120 volts
Neutral
R ed
Bl ue
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