Gas Pressure Setting Procedure; Dip Switches - A.O. Smith GTS-305-NE Service Manual

1. Remove the front panel (four screws).
2. Calibrate the low fire and high fire settings as follows:
A. Remove the allen head plug and attach the manometer to the burner test point located
on the gas control (Figure 86 or 87).
Figure 86
Burner test point
100/101 and 200/201 Series
Models 305e/o, 305i, 505e/o, 505i
On-Demand Gas Tankless Water Heater Service Manual

Gas Pressure Setting Procedure

CAUTION
Do not touch the areas at or near the heat
exchanger or combustion chamber. These areas
become very hot and could cause burns.
Potentiometer (POT)
Dip switches (SW1)
Figure 87
Burner test point
100/101 and 200/201 Series
Models 705e/o (ASME), 705i (ASME)
55
Potentiometer (POT)
Dip switches (SW1)