Sharp R-880S Betreibershandbuch PDF herunterladen (Seite 101)

Glossary

Hertz: A unit of frequency equal to one cycle per second.

Abbreviated “Hz.”

HFC: A refrigerant consisting of hydrogen, fluorine and

carbon. Examples: R134a and 404A. HFC refrigerants contain

no chlorine and are, therefore, considered “safe” for the

environment.

high pressure relief valve: A safety valve on the

refrigeration system that allows refrigerant to escape from the

system if pressure exceeds a predetermined value.

hp (horsepower): A unit of power equivalent to 746 watts

or 550 foot-pounds per second.

HPCO (High Pressure Cut Out Switch): A

pressure-operated switch that opens to stop unit operation

when discharge pressure reaches a predetermined maximum.

kPa: Kilopascals

. A metric unit of pressure. 1 kPa = 0.01 bar =

0.145 psi.

load: 1) The product being refrigerated and transported.

2) The amount of heat being removed by the refrigeration

system. (For example, a compressor is under a heavy heat load

when expected to cool a very warm box.)

LPCO (Low Pressure Cut Out Switch): A

pressure-operated switch that opens to stop unit operation

when suction pressure reaches a predetermined minimum.

modulation: An optional system that reduces load (product)

dehydration and avoids “top freeze.”

movable bulkhead: A thick, insulated, portable wall-like

device used to compartmentalize a temperature-controlled

truck or trailer. See bulkhead.

Multi-Temp: A Thermo King truck or trailer unit capable of

maintaining different set-points in multiple compartments.

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.

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Sharp R-880S Betreibershandbuch Seite 101