Installation Guide

Rinnai Tankless Water Heater Installation and Operation Manual 63

This water heater includes a service indicator (Service Soon, SS). When selected in the parameter

settings, an SS code will display on the controller indicating that it is time to flush and service the

water heater.

• Selection is installer’s preference based on water conditions or other factors that may influence the

suggested interval of service.

• See the “Parameter Settings” section of this manual for selectable service intervals.

• If Service Soon (SS) appears on the controller display, contact your local service provider to flush

and service the water heater (see section “6.3 Flushing the Heat Exchanger”).

• Service Soon will appear again based on the selected service interval.

To reset Service Soon (55)

Figure 70(2)

Service Soon (

) will display on the

controller again when the water heater

reaches the interval selected in the

parameter settings.

Press and hold the

"A" button until "SS"

disappears.

To perform a combustion analysis:

1. Remove the front panel by removing the two screws

and releasing the two latches.

2. Remove the clamp holding the combustion analysis

port cap.

3. Remove the combustion analysis port cap and insert

the gas analyzer probe into the port.

4. Put the water heater into operation for at least five

minutes. Measure CO2 or O2, as applicable, in the

exhaust system.

If combustions exceed the values below:

• Ensure gas type is correct.

• Check exhaust and inlet air for blockage.

• Please call Rinnai Technical Support.

WARNING

Combustion analysis must be performed by a trained and qualified professional.

Figure 70(1)

Insert gas analyzer probe into combustion

analysis port.

5. After measurement, remove the gas analyzer probe, place the combustion analysis port cap

back on, and reinstall the clamp to secure the cap in place.

CO2 O2

7.0% - 11.0% 1.7% - 8.7%

7.9% - 11.9% 2.8% - 8.9% LPG