Maxim M250 Quick Manual

ATTENTION: To be removed by owner/operator only. SAVE THESE INSTRUCTIONS.
This Quick Guide provides a brief overview of how to change the settings on the FireStar controller on
the Maxim M250 for maximum efficiency and operation. Refer to the Owner's Manual for more detailed
information.
IMMEDIATE ACTION REQUIRED
Corrosion Inhibitor Plus (p/n 1650) should be added to the
outdoor furnace BEFORE it is filled with water. See your Owner's
Manual for the normal rate of initial treatment and maintenance.
Setting the FireStar Controller for Heat Load and Efficiency
FIRE
Water Temp
Heat Output
100% 60%
HIGH
65% 20%
Ignition
Hold
to Light
Press
Twice
for Auto
Relight
Auto Relight
Enabled
The FireStar controller is designed to cycle between
three operating modes to control the amount of fuel fed to
the burn chamber and the amount of air for combustion,
thereby regulating the amount of heat transferred into
the water in the furnace. The controller's factory default
settings allow the furnace to operate properly in most
installations without adjustment.
Heat Output Settings
Monitor the outdoor furnace operation to determine if
additional changes are needed, keeping in mind that
it may take several cycles of the heat load before this
becomes apparent.
The reason the FireStar Controller has a MEDIUM
and HIGH heat output setting is for efficiency. The
most efficient setting for the HIGH mode is when the
heat output setting is set as low as possible while still
providing enough heat. The outdoor furnace is more
efficient when operating in MEDIUM mode. In general,
the MEDIUM heat output setting should be set high
enough to minimize the amount of time the controller
is in HIGH mode.
LOW Mode
LOW mode is used to maintain the fire when the heat
demand is low or not present.
Maxim M250 Quick Guide
STAR
TM
b y C e n t r al B o il er
5%
MEDIUM LOW
1%
Air Adjust
Auger
Hold to
Prime
Press
Twice
to Clean
Clean Out
Mode
Power
For proper operation, the fuel must match the
heat load, the furnace must be maintained to
ensure proper air flow, and the water temperature
NOTE: For most applications, the default
LOW heat output setting is adequate for the
outdoor furnace to maintain the burn chamber
temperature. The LOW heat output and air
settings should only require adjustment if the
fire does not relight (without using the gas
burner) when shifting from LOW to MEDIUM, or
if the outdoor furnace overheats when operating
in LOW mode.
• The LOW heat output setting should be set as low
as possible while still enabling the fire to relight
when shifting into MEDIUM mode.
• If there is no fuel left in the burn chamber and the
fire has gone out, the heat output is set too low.
Increase the LOW heat output setting.
• If the water temperature increases above 195˚F
when the furnace is in LOW, the heat output is set
too high. Decrease the LOW heat output setting.
Monitor the outdoor furnace operation to determine if
p/n 9507
additional changes are needed, keeping in mind that
it may take several cycles of the heat load before this
becomes apparent.
MEDIUM Mode
The outdoor furnace is most efficient when it is operating
in MEDIUM mode and not shifting often into HIGH or
LOW mode. The controller changes to MEDIUM mode
when the water temperature drops 2˚ below the water
temperature setpoint. MEDIUM mode represents 20%-
60% of the outdoor furnace's heat output capacity.
NOTE: For most applications, the default
MEDIUM heat output setting is adequate to allow
the outdoor furnace to operate efficiently. For
some heat load requirements or when burning a
fuel other than wood pellets, it may be necessary
to change this setting.
• If the outdoor furnace operates in HIGH mode
much of the time, increase the MEDIUM heat
output setting one step. If the outdoor furnace
changes from MEDIUM to LOW mode when
there is a heat demand, lower the MEDIUM heat
output setting one step.
- 1 -
must be kept above 150˚F.
©2011 Central Boiler
24-Aug-2011 p/n 11404