Rinnai B20 Service Manual download pdf (Page 4)

REU-2532W Series 4 Rinnai

Glossary of Terms and Symbols

This glossary of terms and symbols is provided to assist you in understanding some of the

language used throughout this manual.

DB(A) - sound pressure level in decibels, “A” range

DC - direct current

AC - alternating current

WFCD - water flow control device

FB - feedback information

Hz. - hertz

IC - integrated circuit

BTU/H - British thermal units

PSI - Pounds per square inch

LED - light emitting diode

GPM - gallons per minute

mA - milliamps

W.C. - inches of water column

mm - millimeters

Nox - oxides of nitrogen NO & NO

OHS - overheat switch

PCB - printed circuit board

CPU - central processing unit

POT - potentiometer

rpm - revolutions per minute

SV - solenoid valve

∅∅

∅ - diameter

∆∆

∆

°°

°F - delta T or temperature rise above ambient

POV - modulating valve

TE - thermal efficiency

TH - thermistor

IN -

temperature of incoming water

out

- temperature of outgoing water

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Rinnai B20 Service Manual Page 4