OPERATING YOUR BOILER (continued) PAGE 46
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OPERATIONAL PROCEDURES WHEN A HEAT STORAGE TANK IS CONNECTED
The following operational procedures should be followed when the TARM EXCEL is installed
with a heat storage tank system from TARM USA, INC. The use of heat storage system with a
TARM EXCEL boiler yields increased operating flexibility and allows you to easily extend the wood
heating season and the boiler burns at full output with the cleanest and most efficient operation.
Because of the buffer the heat storage system provides, you are free to fire the boiler when it is
convenient for you. On most days in the winter, you will be able to load the boiler once in 24
hours. In summer you will be able to go 4-10 days between firings to heat your domestic hot
water. You don’t need to rush home or get up early to load more wood. There are no problems
with creosote or overheating if the boiler is oversized. The insulated storage tank absorbs the heat
produced at maximum boiler output until the wood is consumed and the boiler shuts off. Heat is
recaptured from the storage tank as heat and/or domestic hot water is needed in the house.
1. When the “WOOD ONLY” operating mode is used, load the boiler with the volume of
wood and at the frequency that is necessary to maintain the desired water temperature
range in the heat storage tank. The desired tank temperature range is dependant on the
temperature required to heat the home (this varies with outside temperature, heat loss,
type of heat distribution, desired house temperature, etc.) and the temperature required
to heat the domestic (household tap) water. During the coldest weather it may be
necessary to load the boiler with wood 2 or 3 times per day. During cool weather, when
there will be a more moderate heat requirement, it may only be necessary to load the
boiler with partial loads of wood 1 or 2 times per day.
2. Only load the boiler with the amount of wood needed for the demand caused by the
weather and the heat loss of the house or the capacity of the storage tank. The wood
should be totally burned and reduced to low coals before you reload. The ability to judge
the correct amount of wood for each load can only come from experience. There are
many factors to consider and each installation is somewhat unique.
3. If steps 1 & 2 above are followed, the heating surfaces of the wood firebox will stay dry
while burning each load of wood.
4. If steps 1 & 2 above are followed, you will have no problems with smoke spilling out of
the loading door because only coals will be present when reloading. The next batch of
wood will ignite easily and quickly because of the presence of the coals remaining from
the previous load.
5. If steps 1 & 2 above are followed, the by-pass damper will open easily and won’t be
stuck shut with creosote.
6. Maintain a high boiler temperature of 180° F.
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