Rinnai REU-KA2530FFUD-US User Manual

Key to Trade Names in this Manual:
RC & RU-Indicates condensing water heater
models.
Model with
valves in carton
Equivalent Model
RC80e RC80HPe
RC80i RC80HPi
RC98e RC98HPe
RC98i RC98HPi
Some of the trade names for models were changed
to indicate that their cartons included isolation valves
and a pressure relief valve. For service and repair
purposes the table below shows the equivalent
models.
RC80HPe
9 15 20 22 25 28 31
RC80HPi
9 15 20 22 25 28 34
RC98HPe
11 16 20 22 25 28 37
RC98HPi
11 16 20 22 25 28 40
RU80e
13 17 21 23 27 29 43
RU80i
13 17 21 23 27 29 43
RU98e
13 17 21 23 27 29 43
RU98i
13 17 21 23 27 29 43
DIAGNOSTICS
WIRE DIAGRAM
GAS CONTROL
FAN
PC BOARD
WATER FLOW
CONTROL
HEAT
EXCHANGER
MODELS
This manual provides service information for the models
below. This table cross references each model to the
applicable page number for internal component
replacement instructions.
Condensing Tankless Water Heater Service Manual
KA Condensing KB Condensing
100000354

Rinnai REU-KA2530FFUD-US Specifications

General

Type	Tankless
Fuel Type	Natural Gas
GPM @ 45°F Rise	9.8 GPM
GPM @ 70°F Rise	6.3 GPM
Ignition Type	Electronic
Maximum BTU Input	199, 000 BTU
Minimum BTU Input	15, 000 BTU/h
Electrical Requirements	120 VAC
Warranty	12-year heat exchanger, 5-year parts, 1-year labor

Summary

General Information

Safety Definitions

Explains hazard symbols like DANGER, WARNING, CAUTION.

Recommended Tools

Flushing the Heat Exchanger

Procedure

Step-by-step instructions for flushing the heat exchanger.

KA Series Component Replacement Instructions

KB Series Component Replacement Instructions

Gas Control Assembly

Instructions for replacing the gas control assembly.

PC Board Replacement

Instructions for replacing the PC board and setting dip switches.

KA Series Component Replacement Instructions

Fan Replacement

Water Flow Control Assembly Replacement

KB Series Component Replacement Instructions

Combustion Fan Motor Replacement

Water Flow Control & By-Pass Control Assembly Replacement

KA Series Component Replacement Instructions

KB Series Component Replacement Instructions

Heat Exchanger Replacement

Instructions for replacing the heat exchanger.

Heat Exchanger-Reassembly

Steps for reassembling the heat exchanger.

KA Series Gas Pressure Setting Procedure

KA Series Manifold Gas Pressure Settings

KB Series Gas Pressure Setting Procedure

Procedure

Steps for setting gas pressure.

KB Series Manifold Gas Pressure Settings

Settings Table

Provides gas pressure settings based on altitude and gas type.

KA Series Dip Switch Settings

KB Series Dip Switch Settings

SW1 Bank Settings

SW2 Bank Settings