Adjust Gas Pressure Settings
6.Press the test switch twice to record the gas type code into memory. .
7.Press the ON/OFF button to operate the appliance.
8.Press the test switch twice. The LED will display “PL” indicating low fire mode.
9.Compare the pressure reading on the manometer to the desired manifold test pressure (low) for your gas type and altitude. If necessary adjust the low fire pressure using the ▲ and ▼ buttons.
10.Press the test switch. The LED will display “PH” indicating high fire mode.
11.Compare the pressure reading on the manometer to the desired manifold test pressure (high) for your gas type and altitude. If necessary adjust the high fire pressure using the ▲ and ▼ buttons.
12.Press the ON/OFF button again. The LED display turns blank and the appliance returns to the normal OFF mode.
13.Remove manometer and install Allen head screws. Operate the unit and
•check the normal operating sequence
•visually inspect the flame
•check for gas leaks at the test points
Normal Operating Sequence
When you press the ON/OFF button, the LED display will illuminate, the combustion fan will begin to run, and the spark will ignite the main burner.
This heater has an automatic ignition system. When the main burner has lit, the combustion lamp will glow red, and the spark will stop.
Visual Inspection of Flame
Check that the burner flames are operating normally. The flame can be seen through the circular window.
When operating normally the burner flame should appear as long, clear, blue, stable, streaks. Yellow flames or an orange color is abnormal and maintenance is required.
NORMAL
Flame Rod
Long, clear, blue, stable flames
ABNORMAL
Flame Rod 
Yellow flames or
orange color
Final Assembly
1.Install the front panel and bottom cover.
2.If doing a gas type conversion, place the new conversion plate (label) on the front cover.
Rinnai Corporation EX17C / EX22C Manual | 29 |