Solo Plus Instructions 1-800-782-9927 Version 12-13
Tarm Biomass · 4 Britton Lane · Lyme, NH 03768
3.4.8 Installing the 339N Probe Thermometer
The 339N Probe Thermometer (Part #
339N
) is to be installed just downstream of the boiler’s flue
collar. Drill a ¼‖ hole in the side of the pipe and insert the probe all the way in (see
Fig. 3.5
). This
thermometer indicates of how well the wood is burning and when to clean the heat exchange tubes. If
burning dry wood that is split, it should achieve temperatures of 500-600 ºF (260-316 ºC) or more on
the probe thermometer.
If operation of the boiler is not achieving temperatures this high, check the following things:
1. Is the by-pass damper latched tightly closed?
2. Are the vanes on the draft fan clean and not filled with ash or dust?
3. Are the primary air channels open (see
Section 4.16.5
).
4. Is the wood dry (<20%) and split to the proper size?
5. What is the condition of the firebox ceramics?
In most instances, low stack temperatures are an indication that the wood is not dry.
If boiler operations have been producing consistent temperatures and the flue temperature has been
creeping upward, this is an indication that it is time to clean the heat exchange tubes by brushing.
3.4.9 Installing the Optional Turbulators
The 3‖ turbulators
(part # 092244)
are used to increase the heat exchange efficiency of the Solo Plus
boiler connected to a thermal storage tank system.. They are typically not used when a thermal storage
tank is not present.
To install the turbulators, remove the access cover above the heat exchange tubes. After brushing the
tubes place a turbulator in each heat exchange tube.
Boiler Installation & Start-up > Installing the 339N Probe Thermometer
Page 26
Fig. 3.5 339N Thermometer
Installed
NOTE
Tarm Biomass recommends that the turbulators not be installed when a boiler is first installed.
Operate the boiler without the turbulators installed until you maintain a consistent flue tem-
perature of 500 ºF (260 ºC). Constant flue temperatures of less than 300 ºF (148 ºC) are too low
when the turbulators are installed.
