Instruction manual

Page 10
SECTION IV: INSTALLATION (cont.)
If the solar storage tank is installed in a system that utilizes a heat transfer medium
other than potable water, a separate (external) heat exchanger must be installed.
The external heat exchanger must be constructed such that if a failure occurs, it will not
result in contamination of the potable water. For a solar system piping diagram that
incorporates an external heat exchanger, see Figure 3.
PIPING DIAGRAMS
A piping diagram for a typical solar domestic water heating system based on a storage tank
with electric heating backup is shown in Figure 2.
cold water
hot water
solar collector array
anti-scald valve
expansion tank
ll/purge valves
air separator
circulator w/
isolation anges
solar
controller
electric
heating
element
solar storage tank
w/ electric heating element
pressure
relief
valve
air vent w/ shut
o valve
Figure 2: Single tank system with electric backup