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Refrigeration unit
Page 148
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Weighing 350Ib, a one-piece vehicle refrigerating unit has been produced by TransFrig Ltd that has an extraction capacity of 6000 Btu/hr in standard test conditions. It caters for body lengths of up to 33ft and for controlling temperature down to —20deg F (-29deg C). A high temperature model is available for applications in which perishables are carried at temperatures above freezing point up to 60deg F (16 deg C). While the unit is particularly suitable for over-cab installations, a trailer version is available with the necessary couplings. It is claimed that the one-piece construction of the unit greatly simplifies installation.
While the vehicle is in use the unit is powered hydraulically from an integral power take-off pump assembly, mounted direct on the vehicle gearbox. On vehicles without a pto, an alternative form of pump drive is supplied.
The condensing section is made of steel and has an epoxide coating that is durable and weather-proof. Constructed of aluminium, the evaporator section is fitted with a composite wood and polystyrene heat shield. Models are available with a three-phase or single-phase electric standby powered by a weatherproof motor operating at 1500 rpm that is protected against overload and single phasing. The electrics are located on a weatherproof door, which is easily removable for replacement or servicing away from the unit in poor weather conditions.
Air distribution throughout the cargo is continuous except on defrost (low temperature models only) and therefore eliminates the formation of hot spots that occur with equipment that operates on a stop-start cycle. The low temperature model features fully-automatic defrosting which operates only when required, that is when the evaporator coil has built up sufficient frost to reduce the capacity of the unit. Defrosting is carried out rapidly, even in low ambient conditions, by the of a special hot gas revs cycle. The water is drained the evaporator via heated tubes and is drawn to exterior of the vehicle body.
Of the four versions al model, the HH6000 is desi for temperatures down to 3 F (2deg C); the HEH6000 it similar type but is equipped a standby electric drive; HL6000 is designed temperatures down to —2 F (-29deg C) has fully-automatic defrosting tern and is fitted with a rre override switch; and HEL6000, which is an HLt model with a standby elf drive.
All electric models are included in the range desi for static containers and rooms.
Made by: TransFrig Ltd, Park Lane, Swanwick, Si ampton S03 7DL.