Introduction - Rinnai REU-24 W-A Service Manual

The front cover of the appliance is formed from 0.6 mm coated steel, secured to the main
box assembly by 4 (four) screws. Seals around the front cover and flue outlet prevent water
from entering the appliance.
Air inlets are situated in the rear of the main box. The general layout of components is shown
on the cut-away diagram on page 8. 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 attached directly
to the heat exchanger.
The air for combustion is supplied by a fan which is connected directly to the burner
assembly.
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 stainless
steel nozzle situated on the front of the appliance, at the top.
The burner body is diecast aluminium, and the ports are formed
plaque. A two chamber manifold supplies gas to the burner. Two
in the inlet of the manifold.
There are three thermistors - one fitted within the electronic water flow control device,
checking the incoming water temperature - part of the feedforward information; another fitted
to the outlet of the heat exchanger, checking the temperature of the water as it leaves the heat
exchanger; and a third situated at the outlet of the unit, checking the outgoing water
temperature. The Infinity 24 relies on feedforward and feedback information to operate
effectively. See page 9 for further explaination about how this control function operates.
The aim of this manual is to provide an operational reference specifically concerning the
Infinity REU-24 W-A water heater. A glossary of abbreviations is provided on page 4, to
understanding some of the language used throughout this manual. Further
assist you in
information about this product is contained in the customers operation information booklet.

INTRODUCTION

in a ceramic [Cordierite]
brass orifices are situated