OPERATING YOUR BOILER (continued) PAGE 36
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MODES OF OPERATION
The Tarm EXCEL boiler can be operated in three different modes:
• Wood burning only (switch position “WOOD ONLY”)
• Oil or Gas burning only (switch position “BACK-UP ONLY”)
• Wood burning with automatic back-up (switch position “AUTO BACK-UP”)
The settings and explanation for each mode follows:
• WOOD BURNING ONLY (“WOOD ONLY”)
When set to this mode, the draft fan for wood combustion will run to attempt to keep the
boiler at 180° (best operating temperature). There are several conditions which will
cause the wood combustion draft fan to shut off after the boiler has been turned on in
the “WOOD ONLY” mode. The draft fan will turn off if:
1. The main control panel power switch is turned off, or,
2. The boiler achieves the 180°F Operating Temperature (which trips the L8124C “HI”
control),or,
3. The Smoke Temperature Sensor setting isn’t achieved before the Time Delay Module
time setting “times-out” cutting power to the fan (This will happen anytime the boiler
runs out of wood fuel or anytime the wood fire is not hot enough to create a high
enough temperature to activate the Smoke Temperature Sensor.), or, if,
4. The boiler overheats (which trips the L6081A “HI” control).
In summary, as long as there is a sufficient quantity of good quality fire wood in the
boiler it should maintain Operating Temperature (170°F to 180°F).
• OIL OR GAS BURNING ONLY (“BACK-UP ONLY”)
When no heat storage tank is used and when the boiler control is set to this mode,
“BACK-UP ONLY”, the oil or gas burner will fire to keep the boiler at Operating
Temperature (170°F to 180°F). When a heat storage tank is used the burner will also be
responding to the settings on the L8151A aquastat located on the tank, i.e., once the
heat storage tank gets up to 175°F (L8151A “HI” setting) the burner will not fire again
until the tank cools back down to 155°F (L8151A “LO” setting minus the 10° F
differential).
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