
P a g e 7 2 • D R I - S T E E M D e s i g n G u i d e
D R I - S T E E M D e s i g n G u i d e • P a g e 7 3
check valve — a valve allowing fluid flow in one direction only
cold-snap offset RH transmitter — during periods of very cold
weather, this window-mounted temperature transmitter lowers
the RH control point to permit maximum room RH without
condensation on windows
condensate — in humidification, water condensed from steam
condensation — change of state of a vapor into a liquid by
extracting heat from vapor
conductivity — ability to carry electrical current
contactor — electromagnetic switching device
controller — device that regulates the humidification system
CPVC — chlorinated polyvinyl chloride
CSA — Canadian Standards Association
CSI — Construction Specifications Institute
C-UL — Certified by UL in both Canada and the U.S.
Cv — valve flow coefficient
D
dB — decibel
dBA — decibel, weighted
dc — direct current
DEAE — diethylamino ethanol
dia. — diameter
DIN standard — Deutsches Institut für Normung (German Institute
for Standardization)
DI/RO — deionized/reverse osmosis (water)
DK — DRANE-KOOLER
DN — diameter nominal — used to describe pipe sizes in metric
literature
DPDT — double pole, double throw
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