State GTS-110-NI - 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.
‐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.
Pressure port