FAFCO 500 Series, Installation Manual

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9
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.
SYSTEM OVERVIEW
(ON-DEMAND FOR GAS OR ELECTRIC)
SINGLE TANK WITH ON-DEMAND HEATER
Overview (continued)
Temperature
control valve
Gas
On-demand
Heater
Integrated
Circulation Module
(ICM)
Expansion
reservoir
Bypass valves
Polymer Solar
Collector
Storage Tank
Air Vent/Pressure
Relief Valve
Fill valve
Drain valve
Gas
On-demand
Heater
Temperature
control valve
To solar collectors
From solar collectors
Cold
water
supply
Cold water
shut-off
valve
Hot water
to home
Bypass
valves
P/T valve
Self cleaning
filter
Check valve