Installation Guide
6
INSTALLING THE EXPANSION TANK
WATER PIPING
This expansion tank is designed for operation on the inlet cold
water line and is limited to a maximum working pressure of 150
pounds per square inch (psi) is rated to ANSI/NSF Dhot and is
suitable for temperatures up to 200° F.
Figure 1 above shows the correct valves and ttings that you
will need to install your expansion tank. A threaded (3/4”) water
connection is supplied on the tank bottom.
FOLLOW THE INSTALLATION INSTRUCTIONS FOUND IN THE
PACKAGING OF THE PRESSURE REDUCING VALVE AND
PRESSURE GAUGE.
1. The water supply and power (electricity or gas) must be shut
off during the installation of the valves and expansion tank.
Follow the instructions found on the water heater and in the
owner’s manual.
2. Install expansion tank, pressure gauge and pressure reducing
valve, if required, as shown above in Figure 1.
3. After installing the expansion tank and valves it will be necessary
to expel all air from the piping. Turn the cold water inlet shut-
off valve “ON”. To purge the air, open a faucet and wait until a
steady stream of water is coming from the faucet. At this time,
close the faucet.
ADJUSTING WATER PRESSURE
1. Recommended inlet water pressure is 60 psi or less.
2. Refer to the pressure gauge. Using the adjusting screw on the
pressure reducing valve, increase or decrease the pressure as
indicated on the valve.
3. Open a nearby faucet allowing water to run briey and then close
the faucet. Check pressure gauge again and made additional
screw adjustments as necessary. It may be necessary to repeat
this procedure several times before the pressure can be adjusted
to 60 psi or less.
CHECKING EXPANSION TANK AIR CHARGE
1. Shut off main cold water supply valve.
2. Open a nearby faucet allowing water to run until it stops. This
indicates the pressure has been relieved.
3. Using a tire gauge, check the expansion tank’s pre-charge
pressure. The expansion tank air charge must be adjusted to
match the incoming water pressure. If the air charge pressure
needs to be adjusted upward, use only a manual type tire pump
to increase the pressure. If the air charge needs to be reduced,
depress the valve core to release pressure.
4. It is important that you read your city system pressure correctly.
If you read it when it is already hot and expanded you will get
false readings. If you have a pressure gauge in your line, you
should open one hot water valve and let the water run for 15
minutes to reduce the line pressure, then shut the valve off
and then read the pressure immediately. If you don’t have a
pressure gauge in your line you can either call your local water
department or you can get a close approximation from your
Expansion Tank. If you follow the above procedure with your
tank installed and read the air pressure from your tank you will
have an approximate system pressure. (In this case read the
pressure with the tank full of water). If the air pressure reads
50 PSI you need to shut-off your main water line, open a valve
let the water out of the tank, and ll the tank with 50 PSI of air
pressure.
5. Open the cold water supply valve.
6. Now the water heater can be put back into operation. Follow
instructions found on the water heater and in the manual.