
P a g e 7 6 • D R I - S T E E M D e s i g n G u i d e
R
RFI — radio frequency interference
RH — relative humidity
S
SCR — silicon-controlled rectifier
SDU — space distribution unit
SI — Système International D’unités (International system of units
based on the meter, kilogram, second, ampere, Kelvin, candela,
and mole)
SSR — solid state relay
SST — stainless steel
STS humidifier — Steam-to-Steam humidifier
T
T — temperature
TDS — total dissolved solids
TP — time-proportioning
U
UL — Underwriters’ Laboratories
V
VA — volt-ampere
Vac — volts alternating current
Vdc — volts direct current
VL3 — VAPOR-LOGIC3 controller
VLC — VAPORSTREAM’s standard-water model
VLDI — VAPORSTREAM’s DI/RO-water model
VM — VAPORMIST
W
W — watt
wc — water column
wt — weight
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