FAFCO 500 Series Installation Manual page 10

Overview (continued)
Solar-heated water in the solar storage tank preheats the water to the gas on-demand water heater. A solar storage
tank connection kit (PN 730-1) is available from your supplier to connect the solar storage tank to the gas on-demand
water heater. For an on-demand water heater to properly work with a solar water heating system, it must have a
temperature-modulating gas burner. A temperature control valve is required for this configuration, but depending on
the brand and model of on-demand heater, the valve placement may vary. Refer to the manufacturer's instructions for
compatibility with solar water heating systems and proper placement of the temperature control valve.
Temperature
control valve
Cold
water
Hot water
supply
to home
Cold water
shut-off
valve
9
SYSTEM OVERVIEW
SINGLE TANK WITH ON-DEMAND HEATER
(ON-DEMAND FOR GAS OR ELECTRIC)
Gas
On-demand
To solar collectors
Heater
Self cleaning
Bypass filter
Polymer Solar
valves
Collector
P/T valve
Gas
On-demand
Heater
Temperature
control valve
Storage Tank
Expansion
reservoir
From solar collectors
Fill valve
Check valve
Drain valve
Air Vent/Pressure
Relief Valve
Bypass valves
Integrated
Circulation Module
(ICM)