HS Tarm 2000, Installation And Operation Manual

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O
PERATING
Y
OUR
B
OILER (continued)
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HEAT OUTPUT
The Tarm EXCEL is designed to operate in an output range from as low as 17,000 BTU’s per hour
to a maximum of 102,500 BTU’s per hour (140,000 on EXCEL 2200). At maximum output, the fan
will operate continuously. At lower outputs, the fan and the fire will cycle on and off just as an oil or
gas burner does to meet the heating demand. However, trying to operate the Tarm EXCEL on
wood fuel during periods of lower heat demand can be problematic due to lower chimney draft.
NOTE: The chimney draft must always be strong enough to prevent reversed flow in the
boiler’s primary and secondary air supply ducts. Otherwise, smoke may be forced
backwards through the boiler and emitted out of the fan when it is off. This
reversed flow will maintain a smoldering fire in the boiler and can lead to partial or
complete blockage of the air supply ducts, causing inefficient and problematic
operation. It may also result in an objectionable smell of creosote or smoke in
your home. These problems are eliminated entirely when you operate the boiler
with enough demand on it and have a chimney which maintains proper draft.
BURN TIME
Burn time is dependent on the type of fuel being used, the heat load on the boiler as well as how
full you load the firebox. If you have soft wood rather than hard wood, you will need to load the
boiler with more wood to realize the same heat. As well, the colder the weather, the more full you
will need to load the firebox. As noted earlier in this manual, if you are not using a heat storage
tank, you should load you EXCEL boiler at least 3 times a day and let the previous charge of wood
burn down to low coals before loading wood again.
OPERATION DURING SUMMER WHEN NO HEAT STORAGE TANK IS CONNECTED
•
We recommend that you fire your Tarm EXCEL boiler on oil or gas in the summer,
or during other times of low heat demand.
The high efficiency realized with the Excel
oil or gas burners allows you to heat hot water very economically.
•
The Tarm EXCEL will operate at highest efficiency burning wood during the cooler
months, but, because of the characteristics of the Tarm EXCEL combustion system, you
can operate the boiler through the fall and spring whenever the outside night
temperatures require central heating. Your chimney draft and gasket seals are more
critical to operation during times of low heat demand. If you have too high a chimney
draft or air leaks around the fan or doors, the boiler may tend to overheat. If your
chimney draft is too low, the fire will tend to either go out or smoke will back-up through
the fan into your basement. The key to operating the boiler in the warmer months and
even through the summer is to install a heat storage system. Contact Tarm USA, Inc.
for more information on heat storage systems.
NOTE: You will have greater creosote formation in the firebox during operation at lower
output. This creosote, if excessive, can lead to shortened boiler life.
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