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Supply Lines
Domestic Hot
Water Coil
Triple Aquastat
Return Line with
Circulator Pump
Oil Burner
3. The relay box with two rheostats on top provides an asymmetrical cycle timer and speed control of the
stoker motor and combustion fan to keep the boiler running between burn cycles. The factory setting for
the timer is 4 minutes off (this is the first cycle) and 2 minutes on, the combustion fan rheostat is set for
full speed and the stoker rheostat is set for half speed. When the burner circuit is de-energized two
relays isolate the stoker and combustion fan from the L7224 triple aquastat and allow direct control by
the timer and rheostats.
4. The combustion fan mounted under the feeder motor is run at full speed all the time when the L7224
triple aquastat calls for heat and runs by the rheostat and timer when it is not calling for heat.
5. The feeder motor is run at full speed all the time when the L7224 triple aquastat calls for heat and runs
by the rheostat and timer when it is not calling for heat. The coal feed is adjusted by way of a
adjustment screw on the back of the feeder. This adjustment must be accomplished prior to setting the
idle fire settings using the rheostat and timer.
6. The DWYER Air Meter 460 draft gauge supplied with the boiler is designed to monitor draft in the base
and ensure that the fly ash accumulation in the fire tubes is not excessive so as to effect efficiency and
proper operation.
7. The oil gun is designed to hang on a bracket during coal operation and is either unplugged from power
or disabled by a limit switch when in the stowed position.
8. There is a glass view port which covers the hole left open when the oil gun is removed, this glass is held
in by a plate and the three screws that mount the oil gun.
.
NOTE: Outside combustion air may be necessary if: The solid-fuel-fired appliance does not draw steadily, smell, experiences
smoke roll-out, burns poorly, or back-drafts whether or not there is combustion present. Any of the above symptoms are alleviated
by opening a window slightly on a calm day. The house is equipped with a well-sealed vapor barrier and tight fitting windows
and/or has any powered devices which exhaust house air.
There is excessive condensation on windows in the winter. A ventilation system is installed in the house.
DANGER - Risk of Fire or Explosion - Do not burn garbage, gasoline, drain oil or other flammable liquids.
CAUTION – HOT SURFACES – KEEP CHILDREN AWAY – DO NOT TOUCH APPLIANCE DURING OPERATION
DO NOT CONNECT THIS UNIT TO A CHIMNEY SERVING ANOTHER APPLIANCE
WARNING –
RISK OF FIRE – DO NOT OPERATE WITH A FLUE DRAFT EXCEEDING -.07" wc,
OPERATING AT A DRAFT ABOVE -.07" wc CAN CAUSE UNIT TO BURN BACK INTO THE HOPPER
DO NOT OPERATE WITH ASH REMOVAL DOOR OPEN
DO NOT STORE FUEL OR OTHER COMBUSTIBLE MATERIAL WITHIN MARKED INSTALLATION CLEARANCES
CAUTION – BURN RICE OR BUCKWHEAT SIZED ANTHRACITE COAL ONLY
PLEASE SAVE THESE INSTRUCTIONS
Idle Fire Relay
Box
Oil/Coal Switch
Coal Hopper
Oil Burner
Bracket
Base with ash
door
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