Introduction - Rinnai REU-2018W Service Manual

1. Introduction

The brand name Infinity refers to "Endless Hot Water". The Infinity 24 has been developed in
response to the growing changes in the lifestyle of consumers, and the increasing diversification
and sophistication of demand in the marketplace.
The Infinity series offers reduced cost, advanced safety features, and an option to connect one,
two, or three remote control pads.
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The Infinity 24 is delivered with the maximum hot water temperature of 50 C, with or without
remote controls connected.
About the Infinity
The front cover of each appliance in this series is formed from 0.6 mm coated steel, secured to
the main box assembly by 4 screws. Seals around the front cover and flue outlet prevent water
from entering the appliance.
Air inlets are situated in the front panel. The general layout of components is shown on the
cutaway diagram on page 11. All components are supported within a box formed from 0.8 mm
coated steel.
The heat exchanger occupies the top section of the box, and the burner is situated in a chamber
formed from 0.8 mm aluminised steel attached to the bottom of the heat exchanger.
The air for combustion is supplied by a fan which is connected to the burner box by a duct at the
left hand side of the appliance.
Gas and water controls are situated at the bottom right of the appliance, directly under the
manifold. The products of combustion are expelled from the appliance through a flue outlet
situated on the front of the appliance, at the top.
The burner assembly is made up of 18 identical stainless steel bunsen burners, secured by an
aluminised steel framework. An aluminium manifold with 18 integrally moulded injectors supplies
gas to the burners, and is attached to the lower front cover of the burner box.
There is one thermistor, it is located on the outgoing hot water supply tube, near the outlet of the
heater.
Infinity REU-2425W - 3 - Issue 2 - 5/07/04 ©Rinnai