Thermo King Precedent S-600, Operator'S Manual

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Glossary
199
no. 1 diesel fuel: A grade of diesel fuel formulated to
prevent “jelling” in low ambient temperatures.
no. 2 diesel fuel: A grade of diesel fuel formulated for
moderate to warm ambient temperatures.
ohm: An electrical unit measuring the amount of resistance
(opposition to the current flow) in an electrical circuit.
pre-cooling: 1) To cool down an empty box
(temperature-controlled area) to the desired load temperature
prior to loading. 2) To cool cargo to a desired temperature
before loading.
pre-heat: The heating of diesel engine glow plugs prior to
start-up. Some engines use an intake manifold heater rather
than glow plugs.
pre-trip inspection: Checking the operation of a
refrigeration system before loading.
psi: Pounds per square inch. A unit of pressure.
1 psi = 0.069 bar = 6.89 kPa.
psig: Pounds per Square Inch Gauge. Pressure in pounds per
square inch as displayed by a gauge calibrated to zero when
open to the atmosphere.
receiver tank: A refrigerant storage device included in
nearly all Thermo King units.
refrigerant: The medium of heat transfer in a refrigeration
system which absorbs heat by evaporating at a low temperature
and releases heat by condensing at a higher temperature.
refrigerant oil: A special oil used to lubricate compressors in
refrigeration systems.
remote evaporator: A separate evaporator unit located in a
second or third compartment of a multi-temperature truck or
trailer unit.
return air bulkhead: A structure (metal or plastic) mounted
in the front of a trailer and designed to prevent restriction of
return air flow to the Thermo King unit due to improper
loading. See
bulkhead
.
return air temperature: The temperature of the air
returning to the evaporator. See box temperature.
rpm: Revolutions per minute.
setpoint: The temperature selected on a thermostat or
microprocessor controller. This is normally the desired box
temperature.