Main Components - Rinnai REU-2018W Service Manual

12. Main Components

1. Mechanical Water Regulator
Rinnai's unique water regulator mechanism ensures the hot water is maintained with no
noticeable change to the desired temperature during use, even if water pressure drops due to
another tap being turned on and increasing the demand.
The following graphs show that the maximum flow is approximately 24 L/min for the 2425. This
maximum flow is reached at 200 kPa inlet pressure respectively.
Note: Although the 2425W model operates at very low water pressures, maximum performance
is not reached unless the incoming pressure is 200 kPa or more.
2. Preset Bypass
A preset volume of cold water is mixed with water heated in the heat exchanger.
The changeover solenoid increases the flexibility of the regulator/modulating valve by supplying
gas to the right hand side of the burner only, [up to 40% input] or both sides of the burner, [40%
input] + [40 - 100%] through the tandem manifold.
Infinity REU-2425W
3. Burner
The burner assembly is made up of 18 identical stainless
steel bunsen burners, secured by an aluminised steel
framework. An aluminium manifold with 18 integral
injectors supplies gas to the burners, and is attached to
the front lower cover of the burner box.
4. Changeover Solenoid Valve
- 18 - Issue 2 - 5/07/04 ©Rinnai