Bonus Plus Instructions Tarm Biomass 1-800-782-9927 Version 11/14 Page 24
3.4.10 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 350-450 ºF (176-232 ºC) or more on
the probe thermometer.
If operation of the boiler is not achieving temperatures this high, check the following things:
1. Does the chimney have proper draft (see
Section 3.2
)?
2. Is there proper make-up air into the room (see
Section 3.2.1
)?
3. Are the vanes on the draft fan clean (see
Section 4.11.4
)?
4. Are the primary air channels open (see
Section 4.11.6
)?
5. Is the wood dry (<20%) and split to the proper size?
6. 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.
3.4.11 Electrical Connections
The control panel on the Bonus Plus is supplied as a pre-wired assembly. All that is required on-site is
to connect to 120 Volt service at the junction box that was installed on the back panel of the boiler.
Please refer to electrical drawings in section 6.
Boiler Installation & Start-up > Connections to the Boiler
3.5 Commissioning the Boiler
3.5.1 Safety Plumbing
The temperature /pressure indicator (provided. Part #
PT1088
), boiler pressure relief valve (provided,
part
# 1040705
), must be installed as shown in
Fig. 3.10
. A 1” nipple, 1”X ¾”X 1” tee and 1”X¼”
reducer is provided to ease operation. Follow applicable codes.
Fig. 3.5
Installed relief valve and
temperature/pressure
indicator.
Fig. 3.10