Rinnai Corporation Conversion Manual 5
Adjust Gas Pressure Settings
1. Turn OFF the gas supply.
2. Turn OFF the power supply.
3. Remove the front panel (four screws).
4. Check the gas type using the data plate on the
side of the unit. Confirm that the gas type switch
is in the correct position (switch 1 of SW2 is ON
for natural gas, NG, and OFF for propane gas,
LPG.) Figure 1.
5. Remove the screw and attach the manometer to
the burner test point located on the gas control.
Figure 2.
6. Turn on the gas supply and the power supply.
7. Flow water through the water heater at the
maximum flow rate obtainable. (At least 3 gallons
per minute is recommended. If there is not
enough water flowing, the water heater could shut
off or sustain damage due to overheating.)
8. Move switch 8 of SW1 to ON. Figure 1.
9. Push the PC board switch A for one second.
10. Calibrate “Forced Low” (Min Rate) combustion
using switch A (up) and switch B (down). Use the
Gas Pressure Settings on the previous pages for
your model, gas type, and altitude.
11. Move switch 8 of SW1 to OFF and then back to
ON.
12. Push the PC board switch B for one second.
CAUTION
Do not touch the areas at or near the heat exchanger
or hot water lines. These areas become very hot and
could cause burns.
CAUTION
Do not touch any other areas on the PC board
besides the “SW” switches while power is supplied to
the appliance. Parts of the PC board are supplied
with 120 volts AC.
Burner test point
Figure 1
Figure 2
Complete this section for high altitude installation or after converting for gas type.
Confirm that the inlet gas pressure is between the minimum and maximum pressures allowed for this appliance.
#8 for forced low and high
#1 ON for natural gas;
OFF for propane gas
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