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Your Insert's Controls and What They Do
All Merrimack Large Insert controls are conveniently lo-
cated on the front. (Fig. 9)
Three controls regulate the performance of your Merrimack
Large Insert:
The primary air control supplies oxygen for the fire.
The variable-speed fan control, or rheostat, regulates
the warm air flow into the room.
An automatic setback control provides a high air setting
of restarting or reviving a fire after reloading and closes
automatically once the stove reaches operating tempera-
tures.
Air Control Lever
Jacking
Screws
Fan Speed Control (Behind louvre)
Fig. 9 Merrimack Large Insert controls.
Primary Air Control
A single air control regulates the amount of heat the fire
will produce and how long it will burn.
The primary air control lever is located on the upper left
side on the front of the insert. The lever regulates air for
starting, maintaining, and reviving the fire.
Generally, more air entering the stove makes the fire burn
hotter and faster, while less air prolongs the burn.
The Merrimack Large Insert's air supply is increased when
the control lever is moved to the left, and decreased when
moved to the right. It may be set anywhere between the
two extremes, depending on the amount of heat desired.
(Fig. 10)
To complement the manual setting of the air control, the
Merrimack Large Insert has an integral convection air
blower that ensures an even delivery of heat at the manual
setting you select.
30004671
Space Between
Doors and Upper
Lattice
FP2493
Merrimack controls
Operation
Air Control
Lever
Fig. 10 The air control lever controls the amount of air enter-
ing the firebox.
The convection fan delivers a steady stream of warm air
Jacking
into the room. Use the fan speed control to regulate the flow
Screws
of air into the room. A thermal switch will automatically de-
activate the fan when the stove cools down. When starting
a fire in a cold stove, this switch will typically energize the
fan within about 20 minutes, after the stove heats up.
The fan speed should be set at "low" (fully closed) when
operating at low to medium burn rates and may be set
anywhere between "low" and "high" when operating at high
FP2493
burn rates. (Refer to Figure 11 for fan access)
Fig. 11 Fan control access.
This wood heater has a manufactured-set minimum low
burn rate that must not be altered. It is against federal
regulations to alter this setting or otherwise operate this
wood heater in a manner inconsistent with operating
instructions in this manual.
Merrimack Large Insert
Open -
Control Lever to the Left
Closed -
Control Lever to the Right
ST1157
The Fans
primary air control
Speed Control
Open Bottom Louvre to
Access Fan controls
WARNING
ST1156
fan speed control
ST1157
ST1156
9
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