Solo Plus Instructions 1-800-782-9927 Version 12-13
Tarm Biomass · 4 Britton Lane · Lyme, NH 03768
3.4.4 Pipe Connections – Choice of Material
A copper/steel mixture can be used for the heating side. Copper followed by galvanized piping (in the
direction of the water flow) should be avoided for hot water for reasons of corrosion protection. How-
ever, galvanized cold water piping and copper piping can be used for hot water. The supply and return
flows must be carefully insulated to avoid heat loss.
3.4.5 Expansion Tank
The size of the expansion tank is determined by the total water content of the heating system.
3.4.6 Pump Size
The size of the circulation pump is determined by the size of the system and the pipe dimensions.
3.4.7 Installation of Optional Domestic Hot Water Coil
A tankless coil for heating domestic hot water is available as an option on the Solo Plus boiler. For
ready access to the coil, remove the boiler’s jacket (refer to
Fig. 3.4
for piping).
Pipe the cold water to tapping #15, and hot water from tapping #14 (or vice versa). It will be necessary
to drill holes into the boiler’s side panel for the hot and cold water lines. It is desirable to install unions
to the boiler in both the cold and hot water lines.
Cold water must be piped separately to the separate water heat, not through the coil in the Solo Plus
boiler.
Install a Pressure Relief Valve (Conbraco 17-402-01 100psi, supplied with coil kit) in a tee on the cold
water supply to the tank-less coil. There must be no shut-off valve or check valve between the relief
valve and the tank-less coil.
Boiler Installation & Start-up > Pipe Connections-Choice of Material
Page 24
NOTE
If a separate hot water heater will be used to heat domestic water during the warmer months,
cold water must not flow through the domestic coil if the Solo Plus is unheated! Condensation
and corrosion of the boiler body can result if water flows through the unheated boiler.
NOTE
The Relief Valve discharge line must be piped to within 6” (152 mm) of the floor near a drain,
and must be ¾” pipe with no reduction. If this valve operates, hot water or steam will be dis-
charged. It should be piped to an open drain; so that this water will not damage the room in
which the boiler is located.
CAUTION
CAUTION
☼
To prevent the possibility of a person sustaining serious burns from domestic hot water, a
tempering valve (Watts 70A or equivalent), and or an appropriate anti-scald device must
be installed to protect against dangerously high domestic water temperatures.