Ring Main Pump; Service - Rinnai HD28E Operation & Installation Manual

Some fault codes are model specific and so not all codes will display on all models. If the fault
code being displayed is not listed above, contact Rinnai for advice.
NOTE
In the majority of cases, you may be able to clear the Error Code simply by turning the hot water
tap OFF, then ON again. If this does not clear the Error Code, try pushing the On/Off button OFF,
then ON again. If the Error Code still remains, contact Rinnai for advice.
All Items
Heat Source
•
Ensure that the filter at water inlet is clean. Note that this is an 'O' ring seal and does not need to be
excessively tightened. Just make sure 'O' ring is engaged inside machined surface in brass housing. Isolate
heater before removing filter for cleaning and inspection.
•
Ensure all Rinnai Water Heaters are operating. Ensure power is available to units if not operating. Check
Socket Outlets.
•
Many new jobs or ones where the gas supply has been modified need to purge the gas supply lines as they
are full of air. Purge should be carried in accordance with AS/NZS 5601, Appendix 'D'.
•
In jobs that operate for long hours and/or in dusty or smoky environments the combustion air fan may
become dirty. This may be indicated by Fault 10. Contact Rinnai Service.
•
Internal heaters may operate for a short period of time and then stop. This can be caused by Rinnai Co-axial
flueing not being pushed together properly and exhaust gases are re-entering the inlet air. Check flue
connections. Also inspect flue terminal for any cause to divert exhaust air back into the inlet air. Ensure flue
is terminated correctly in accordance with AS/NZS 5601.

RING MAIN PUMP

•
These are used for circulating water around the building. They are normally left on or may have a time clock
to switch it off at night when the building is not in use.
•
These pumps do not pressurise the system.
•
They must have a non return valve
•
Swing non return valves must be horizontal or upward as they rely on gravity to close the valve.
•
Spring check valves can be located on any plane but may contribute excessive back pressure and restrict
the pump flow rate.
•
Return water should only be slightly cooler than water leaving the system. If the temperature drop around
the circuit is too high it may indicate that the ring main flow rate is not high enough and indicates a design
fault or a blockage in the pipework (or poor pipework insulation). Investigate valves and operation of pump.

SERVICE

Rinnai has a service and spare parts network with personnel who are fully trained and equipped to provide the best
service on Rinnai appliances. If your appliance requires servicing, please call our National Help Line.
Rinnai recommends that all commercial water heater installations have a service arrangement.
Annual services are recommended at a minimum. Refer to the back cover of this manual for contact information.
Rinnai 21
FAULT FINDING
Commercial Manifold Pack OIM