Rinnai REU-2018W Service Manual page 5

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
kcal/h - kilocalorie per hour
kPa - kilopascals
LED - light emitting diode
L/min - Litres per minute
mA - milliamps
MJ/h - megajoule per hour
mm - millimetres
mmH O - millimetres of water (guage pressure)
2
NO - oxides of nitrogen (NO & NO
X
OHS - overheat switch
PCB - printed circuit board
CPU - central processing unit
POT - potentiometer
rpm - revolutions per minute
SV - solenoid valve
ø - diameter
o
∆
C - temperature rise above ambient
POV - modulating valve
TE - thermal efficiency
TH - thermistor
T - temperature of incoming water
IN
T - temperature of outgoing water
OUT
Infinity REU-2425W
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- 2 - Issue 2 - 5/07/04 ©Rinnai