FAFCO 500 Series Installation Manual page 20

3: Tank Plumbing—Dual Tank
Note: A Solar Storage Tank Add-On Kit can be used for this installation configuration.
This kit is available through your distributor. The tank is plumbed as shown.
STEP 1: RE-DIRECT WATER SUPPLY
Re-direct the cold water supply line from the water heater cold inlet, to the tee above the temperature control
valve as shown. Use one of the new flexible hoses unless you prefer to use the existing hose. When attaching
to the cold water supply line, connect directly to threads. If no threads are present use the provided adapter,
3/4" compression X 3/4" MPT. For 1" copper tubing, purchase a 1" compression adapter.
STEP 2: INSTALL SELF CLEANING FILTER TEE AND BYPASS VALVES
Apply thread sealant and install 3/4" tee in the upright position onto the storage tank port labeled "C" for cold.
Insert the screen filter, open end first, into the 3/4" x 1/2" reducer. Apply thread sealant to reducer, and install into
the side of 3/4" tee as shown. Assemble the other 4 provided flexible hoses, remaining fittings and bypass valves
as shown. Important: Before turning on the electricity or gas supply, be certain that the tank is full of water. Do
not use thread sealant on flexible hose connections.
STEP 3: FILL TANK & ACTIVATE ELECTRICAL/GAS SUPPLY
With the system in normal operating position, and a hot water faucet still open, turn the cold water shut off valve
on to allow water to enter the tanks. The open hot water faucet will permit air to be purged from the tank. Close
the faucet when the water becomes a constant flow and all air is purged. Inspect for leaks and tighten connec-
tions where necessary. Reconnect and activate electrical or gas supply. Open or close the isolation valves as
shown to switch between normal operating position and bypass position. All interconnecting hot water piping and
the final 5 feet of cold water supply pipe shall be insulated with R-2.6 or greater insulation. Attach provided valve
position label to the cold water shut off valve. Attach Storage Tank Bypass label to one of the 2-way valves. Attach
Cold Water Shut-Off Valve label to cold water shut-off valve.
Cold Water
Hot Water
Supply
To Home
Temperature
Control Valve
C
H
Water Heater
Normal Operating Position
19
Cold Water Shut-Off Valve
Adapters (if necessary)
C
H
Storage Tank
Bypass Valves
Self-Cleaning Filter
Bypass Position
Bypass Valves
Dielectric
Nipples