State 520 - Manual (Page 19)

Installation
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Page
1. Turn off all electric power to the water heater if service is to be performed.
2. Turn the manual gas valve located on the outside of the unit clockwise  to the
off position.

Do not use this water heater if any part has been submersed under water.
Immediately call a licensed professional to inspect the water heater to replace
any damaged parts.

Do not reverse the hot outlet and cold inlet connections to the water heater.
This will not properly activate the water heater.
‐Measuring inlet gas pressure‐
The water heater cannot perform properly without sufficient inlet gas pressure. Below are instructions
on how to check the inlet gas pressure. THIS IS ONLY TO BE DONE BY A LICENSED PROFESSIONAL.
1. Shut off the manual gas valve on the supply gas line.
2. Remove the screw for the pressure port located on
the gas inlet of the water heater shown in the
diagram to the right.
3. Connect the manometer to the pressure port.
4. Re‐open the manual gas valve. Check to see that
there are no gas leaks. Open some of the fixtures
that use the highest flow rate to turn on the water
heater.
5. Check the inlet gas pressure. When the water heater
is on maximum burn, the manometer should read
from 5.0” to 10.5” WC for Natural gas, from 8.0” to
14.0” WC for Propane.
WATER CONNECTIONS
All pipes, pipe fittings, valves and other components, including soldering materials, must be suitable for
potable water systems.
1. A manual shut off valve must be installed on the
cold water inlet to the water heater between the
main water supply line and the water heater.
2. In addition, a manual shut off valve is also
recommended on the hot water outlet of the unit.
If the water heater is installed within, or
subjected to, a closed loop water system, a
thermal expansion tank must be installed.
3. Before installing the water heater, flush the
water line to remove all debris, and after
installation is complete, purge the air from the
line. Failure to do so may cause damage to the
heater.
4. There is a wire mesh filter within the cold inlet to trap debris from entering your heater. This will
need to be cleaned periodically to maintain optimum flow.
CAUTION
Pressure
Relief Valve
Hot
outlet
Cold
inlet Gas
As Close as
Possible