Rinnai REU-KBM3237FFUDHD-E, Service Manual

Page: 6 / 12

6
Service Procedure

Reinstate the gas supply and the mains electrical supply

Fire the appliance up ensuring there is a good flow going through the water heater
and ensure the Electrode Kit is not leaking POC’s.

Carry out a visual inspection of the heat exchanger and joints to check for any
leaks.
 Shut appliance down and connect a Digital Manometer on to the test point that is
highlighted in the diagrams on the page “Setting Gas Pressures”.

Using the correct procedure check the Low and High Fire Gas Pressures, again
using the Setting Gas Pressures page and note them down on your report sheet.

With the appliance in Normal Operation mode you can carry out a Flue Gas
Analysis if you wish to do so. Please see the below table for normal operating
parameters. If you have concerns over any readings please contact the Rinnai UK
Technical Department.
 Check the Dip Switches are set correctly using the Dip Switch Setting page.
 Isolate the water supply and check the Water Inlet Filter on the cold connection to
the water heater.
The service on the Rinnai Water Heater is now complete however please carry out full
checks of the system and flue system to ensure both of these are functioning correctly. If
there is a fault on either of these two systems this could affect the correct operation of
the appliance.
SERVICE
a CO (ppm) 77
b CO2 (%) 8.41
c Flue Gas Temp (°C)
46
℃
d Ratio (%) 0.0107 (CO air free)