1
General information
The Lochinvar Thermal-Stor stratified solar tank is designed to use a solar thermal collector system, in conjunction with a
back-up heat source, to provide water for a closed loop hydronic heating system. The appliance consists of a spherical heat
exchanger connected to an unlined storage tank. The Thermal-Stor tank uses solar heated water pumped through the spherical
heat exchanger to heat water in the tank. A backup heat source is used to maintain the desired tank temperature in the event that
adequate solar heat is not available. Tank components and specifications are detailed in FIG.’s 1-1 and 1-2, as well as in Tables
1A - 1D on pages 4 through 6.
The Thermal-Stor buffer tank can provide both thermal storage volume and hydraulic separation between the boiler or heat
pump and the building distribution system. The primary application of a buffer tank is to reduce boiler or heat pump cycling
in systems operating below design load conditions, or in systems having several low Btu heat loads calling for heat at different
times. The solar-assisted buffer tank provides thermal storage volume which can help reduce short-cycling, leading to longer
runtimes, higher efficiency and longer equipment life for the solar thermal system and heat source. If piped correctly, the buffer
tank can also function as a hydraulic separator, effectively separating the flow in the boiler loop from the flow in the distribution
system (FIG.’s 4-2 and 4-3, on pages 14 and 15). This tank has many applications including geothermal, pool and space heating.
Consult the factory if your specific application is not covered in this manual. This tank is not intended for use in gravity water
heating applications.
Table 1A
Thermal-Stor
Tank Component Materials
Component
Material
Tank
Steel SA414-G
Insulation Polyurethane
Foam
Jacket
Pre-paint Sheet Metal
Operating Restrictions:
•
Maximum stored water temperature is 210°F.
•
Maximum working pressure for the vessel is 125 psig.
4
Table 1B
Spherical Heat Exchanger
Component Materials
Component
Material
Housing
Steel S 235 JR
Heat Exchanger Coil
Copper
Insulation
Polyurethane Foam
Jacket
Polypropylene
Tank shipment
Tanks taller than 7.5 feet will be shipped horizontally. Four
shipping legs are used to secure the tank to a pallet, and holes
are provided in the top cover for access to lifting lugs. The
shipping legs should be removed when the tank is removed
from the shipping crate.
Use field-supplied insulation to pack the shipping and lug
compartments, then use the factory provided covers to
conceal compartments upon final installation.
Installation & Operation Manual
