Solo Innova Instructions 1-800-782-9927 Version 01-18
Tarm Biomass · 4 Britton Lane · Lyme, NH 03768
3.4.2 Safety Plumbing
OVERHEAT LOOP: NO ELECTRICITY:
The piping and controls must be connected to the boiler
in such a way that in the event of a power failure there is one loop of radiation available for gravity
circulation. This loop must not be obstructed by any valves or other accessories which would prevent
gravity circulation during a power failure. The piping is plumbed in such a way that excessive pressure
will not be developed in any portion of the boiler or system. The loop must be large enough to dissi-
pate at least 10% of the boiler’s maximum rated heat output, assuming an ambient temperature of
65
°
F (18 ºC)
and a mean water temperature of 180 ºF (82 ºC)
.
The minimum pipe size for this loop is ¾” and if possible, the loop should be located and pitched to
maximize natural thermal convection of the water. The loop must be positioned above the boiler. The
design of the loop must be such that it can be made inoperative only in a deliberate manual action. If
large enough, an existing heating radiation zone may be used for the over-heat loop. The loop must be
equipped with zone valves which will open automatically during a power failure. We recommend
AUTOMAG zone valves for this application (offered as an accessory).
OVERHEAT LOOP: WITH ELECTRICITY:
The HONEYWELL L4008B aquastat provided with
this boiler must be wired in parallel with the thermostat on the zone with the most heating capacity in
the main living area (dump zone). Upon reaching the aquastat set point, the dump zone will be acti-
vated, pulling heat away from the boiler. The home owner is alerted to a potential problem with the
boiler by an overly warm living space.
Do not use self contained, non electric zone valves in the zone controlled by the overheat control!
Such valves would prevent the overheat control system from the cooling the boiler when necessary.
One potential for overheating the boiler is if the boiler operator were to load too much wood into the
firebox for the thermal storage system to absorb all of the heat produced by the load of wood. With
minimal experience, most Solo Innova owners will learn to operate their boilers and thermal storage
system so over-heating problems are rare.
3.4.3 System Plumbing
There are numerous possibilities for connecting your Solo Innova and thermal storage system to your
home heating system. Tarm Biomass provides diagrams
(located in appendix)
as concept diagrams
only. Final design, installation, and code compliance details are the responsibility of the designer/
installer of the system.
NOTE
SYSTEM DESIGN: Consider first provisions for handling excess heat produced by an over-
heating boiler both with electricity and during a power failure.
NOTE
THE THERMAL STORAGE SYSTEM MAY NOT BE USED AS A DUMP ZONE!
Boiler Installation & Start-up > Connections to the Boiler
Page 27
NOTE
Any radiant tubing used with the Solo Plus boiler must have an oxygen barrier! Non oxygen
barrier tubing must be separated from the boiler using a heat exchanger.
NOTE
The Normal Operating pressure is between 12-15psi.
