MAGNUMZC MANUAL – April 2006
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5
DAMPER / COMBUSITON AIR CONTROLS
When starting a fire, open the damper and combustion air controls to the full open position (damper handle
straight up and ZC-60 combustion air knob pulled out). After the fire has had sufficient time to ignite,
close damper control to desired setting, approximately 2/3 to fully closed) Normally the combustion air
control will be left fully open when the fire is burning, and closed when you are no longer using the unit. If
you have excessive chimney draft or want the unit to burn slower adjust the control up to ½ closed.
NOTE:
When you partially or fully close the combustion air-control you will get additional buildup of
soot on the glass. When the unit is not in operation close the damper and the combustion air controls all
the way to minimize cold air penetration (frosting) of the unit glass when it is cold.
Always open the damper control fully open before opening the door, to minimize the possibility of back
drafting (smoke) coming into the room. Allow approximately 10 seconds of time before opening the
doors.
ACCELERATED COMBUSTION (High Heat Output)
The maximum heat output for the
MAGNUM ZC
is achieved by burning with the doors closed and the
damper and combustion air controls fully opened. By this method, the
MAGNUM ZC
can produce
85,000+ BTU’s of heat per hour. It will be necessary to reload with wood every one to two hours. This is
the least efficient method of burning the
MAGNUM ZC
and must not be done for long periods of time.
Use caution when firing with the damper control wide open. Only burn hard cordwood in this manner.
Never burn scrap wood or softwood in this manner. Damage to the firebox or chimney fires could occur.
Do not overfill with wood in an attempt to prolong reloading time. Too much wood may cause an over
fire condition damaging the fireplace. Never load over 3-4 pieces of wood at a time on this setting.
MEDIUM COMBUSTION
This is the recommended way to operate your
MAGNUM ZC
to achieve the highest level of efficiency
and the least amount of creosote on the glass and in the chimney.
The damper control should be approximately 2/3 closed and the combustion air 2/3 to fully open. The
precise setting will depend on many factors, including chimney height, house air tightness and the moisture
content of the wood. Three (3) to four (4) medium size pieces of split wood (ranging from 4” to 8” in
diameter should be burning on a bed of hot coals. The heat output will be approximately 65,000 BTU per
hour and the loading time will be 3 to 4 hours. Softwoods may be burned using this method but burn time
will be substantially reduced.
SLOW COMBUSTION
Place four (4) to six (6) pieces of split wood six (6) inches or greater in diameter on top of a hot bed of
coals. Close the damper control 2/3 to fully closed and adjust the combustion air control 2/3 closed. This
method of burning should be used only after operating the
MAGNUM ZC
with the damper control open
to produce a hot fire (see Refueling For Best Performance). Creosote from the fire may accumulate on the
glass doors unless the firebox is hot.
