Rinnai RX199i Manual page 6

CAUTION
•
Do not touch any areas on the PC board other than the described buttons while power is
supplied to the water heater. Parts of the PC board are supplied with 120 VAC.
•
Do not touch the areas at or near the heat exchanger or hot water lines; these areas become
hot and could cause burns.
1. Remove the water heater front panel by removing the two screws and releasing the two latches.
Refer to the "Tankless Water Heater Installation and Operation Manual" for complete instructions
on removing the front panel.
2. Power cycle the water heater (turn off electrical power to the water heater, then turn on power
again). Power can be turned off by unplugging the power cord or turning off electricity at the
circuit breaker. The controller does not control the electrical power to the water heater.
3. Locate the PC board (lower front of unit) (Figure 3).
4. Locate the two push buttons ("A" and "B") on the PC board (Figure 3).
5. Press the "A" button for one second to enter into parameter settings mode (Figure 3).
Figure 3
6. Press the up and down arrow buttons on the controller until parameter setting
appears in the display (Figure 4).
7. Press the "On/Off" button to change the selection (Figure 4):
10A
• Select
10b
• Select
Figure 4
8. When the parameter is set accordingly, press and hold the "A" button on the PC Board (Figure 3)
for one second to save your settings and exit parameter settings mode.
9. Proceed to the next section to continue the gas conversion steps.
Notice: You may see error code 21 at this point. If so, contact Rinnai at 1-800-621-9419.
6
for Natural Gas (NG)
for Propane Gas (LPG)
Natural Gas (NG)
10A
"On/Off"
Button
Gas Conversion Manual for Condensing Tankless Water Heaters
PC Board
Propane Gas (LPG)
10b
A
B
10A 10b
or