Solo Innova Instructions 1-800-782-9927 Version 01-18
Tarm Biomass · 4 Britton Lane · Lyme, NH 03768
Assuming that
TV1
is hot, the water being circulated by
C3
is now heading for the supply manifold.
If no zones are calling for heat the
C1
pump will be off (If used,
ZV-1
will also be closed). All of the
hot supply water being moved by
C3
must travel through the thermal tanks from top to bottom and
then back through Port 2 of the Termovar and back to the boiler.
Tarm Biomass recommends the use of the
BLTCONTROL
(available through Tarm Biomass) where
the Solo Innova boiler is used with another backup boiler.
BLTCONTROL
is a three position control
that allows switching between wood only, wood with automatic back up, or back up only, by control-
ling the operation of the back up auxiliary boiler.
BLTCONTROL
takes input from a zone relay con-
trol and determines based on thermal storage system temperature or second stage thermostat reading,
whether to pull heat from the thermal storage system or the back up auxiliary boiler.
BLTCON-
TROL
simply integrates the Solo Innova boiler and thermal storage system with an existing fossil fuel
heating system.
If at any point while the boiler is in operation, a zone calls for heat circulator
C1
is energized (If used,
ZV-1
will open). Heat flows directly from the boiler to the supply manifold. If the boiler has burned
through its wood and has cooled, Port 2 of the
TV1
valve will close and
C3
will stop. Flow through
the boiler will cease. Once the boiler is eliminated from the plumbing circuit, any zone that calls must
pull heat through the thermal storage system. Return water passes into the bottom of the thermal tanks
and exits the top of the tanks, re-heated by the thermal storage system, and moves to the supply mani-
fold. If however, upon a call for heat, the temperature in the thermal storage system is below the
aquastat (HONEYWELL
L4008A
or equivalent) set point,
C1
will cease operation (If used,
ZV-1
will
close). The back up boiler will be energized through the
BLTCONTROL
to meet the heat demand.
Tarm Biomass recommends the use of an additional Termovar valve model
6440AF
(TV2)
for most
installations. Without
TV2
it is possible that when a small zone is the only zone calling, a master
bathroom zone for instance, all of the heat the boiler is producing is drawn to the small zone. The re-
sult is that a 100,000 – 175,000 Btu (30-50 kW) boiler is sending all of its output to 2,500 Btu (0.73
kW) load. The boiler could quickly reach operating temperature and shut off, which must be avoided.
TV2
solves this problem. It operates much the same way that
TV1
operates except that it is a divert-
ing valve. Port 1 of
TV2
receives water from the return manifold. Port 2 of
TV2
is connected to the
supply manifold. Port 3 of
TV2
is connected to the return to the boiler and to the thermal storage sys-
tem. When the
TV2
senses water 165 ºF (74 ºC). and above, it shunts water from Port 1 to Port 2
(back to the supply manifold). Because water returning to the boiler from the return manifold is di-
minished, the remaining flow from the boiler is forced through the thermal tanks in the thermal storage
system. The result is that both the zone and the thermal storage system receive hot water and the
boiler may continue to burn with a demand equal to or greater than its output. The end result is that
the heating load is always prioritized over the thermal storage system, but heat not used will be stored
in the thermal storage system for later use.
Boiler Installation & Start-up > Connections to the Boiler
Page 31
