TM 10-4510-209-13&P
maintained contact versions, and may also have a
center OFF position.
Double-Pole, Single-Throw (DPST) Switch
A switch that makes or breaks the connection of two
circuit conductors in a single branch circuit. This switch
has four terminal screws and ON/OFF markings.
Dual Voltage
Some motors can operate on two different voltages,
depending upon how it is built and connected. The
voltages are either multiples of two or the 3 of one
another.
Electrode
The terminal in electric apparatus that conducts
electricity in or out.
Element
An electrical resistance assembly used to create heat
Evaporator
Part of the refrigeration system where refrigerant
vaporizes and absorbs heat from water flowing over the
front of the evaporator plate, turning it to ice.
Expansion Valve
A metering device which reduces the pressure of the
liquid refrigerant flowing into the evaporator, causing it to
boil and absorb heat.
Filter-Drier
Filters liquid refrigerant, keeping system dean. Desiccant
traps small quantities of moisture, keeping the system
dry. Must be replaced any time the refrigeration system
is opened.
Force Provider
A deployable system of shelters and services which can
be prepositioned and quickly set up in any theatre of
operation.
GFCI Or GFI (Ground Fault Circuit Interrupter)
A specific type of circuit protection (commonly required
in kitchens & bathrooms) that helps safeguard against
shocks. GFCI protection can come from an outlet or a
breaker.
Ground Or Grounding
Connecting one side or neutral of a circuit to the earth
through low resistance or low impedance paths, to help
prevent transmitting shocks to personnel.
Hertz (Hz)
Expression of AC frequency in cycles per second, e.g.,
60 Hz.
Hot Gas Valve
Solenoid valve which Is energized during defrost
allowing hot gas refrigerant to enter the evaporator(s),
warming it to break the bond of the ice slab to the
evaporator.
Kilowatt (kW)
Real power delivered to a load (W x 1,000 VA).
Knockout
A removable piece of an electrical box or panel that's
"knocked out" to allow cable to enter the box.
GLOSSARY-2
