The original Dijko System of hot air circulation between baking trays is used in these ovens to ensure evenness of product baking. By simply pressing the starter button on the oven control panel, all functions, such as gas ignition and temperature control, are automatically carried out. A major advantage of these ovens is the relatively small floor area they occupy, for the very high baking capacity available. The Dijko Rack Ovens have been designed for use in smaller bakeries and plant bakeries where large varieties in medium quantities of cookies and pastries are baked in batches on trays. Equally, these ovens are used for baking bread, rolls, buns, cakes, pies, pizzas and rye bread sterilization.
The oven capacity is normally limited by the product height and it is possible to hold from 12 trays 60 × 80 cm on 12 decks up to a maximum of 32 trays 60 × 80 cm on 16 decks two side by side according to the size of oven chosen.
It is only necessary to set the required temperature of baking by adjusting the thermostat and the baking time on the built-in timer. At the end of baking, the timer buzzer provides a distinctly audible signal indicating the oven can be discharged. The racks form a part of the oven when they are used for baking, but are also used for transport within the bakery. During the baking process, the insulated rack base seals the lower part of the oven and the insulated back wall of the rack seals the oven opening. The entry to the oven has spring-loaded seals on the sides and top, with the rack base running between guide rails to give a complete seal. The floor of the rack is built approximately 40 cm above the bakery floor, and mounted on swiveling, rubber tyred wheels with ball bearings on the axles, to prevent any possible damage to the floor and to provide easy and quiet mobility. The bearings can be supplied with freezer resistant grease, if the racks are to be transported to a cooler/freezer situation.
The baking trays and the products are directly heated by air circulated via carefully designed air ducts, which ensure an even bake throughout the oven. The temperature of the air within the oven is maintained at a constant level by a thermostat. As there are no stone or tile floors or other heat-absorbing media, the Dijko Rack Ovens rapidly attain the required temperature and cool equally quickly. Heat is generated by burning gas in two or four combustion chambers (depending to the oven size chosen) located in the crown of the oven. Electric heating is optional. A turbine fan located between the heat exchangers, provides circulation of the hot air.
When the gas mains is opened and the start button on the instrument panel is activated, the fan starts running. After a PRE-purge period of one minute, the pilot flames are automatically ignited. Electronic burner safety control equipment constantly checks the safe burning of these pilot flames and will immediately switches off the gas supply if there is a failure. The thermostat controls the operation of the main burners switching them on and off as heat is required. The accuracy of temperature maintenance is ± 2 °C. The oven temperature increases at the rate of 15-25 °C / minute. The main burners cut out when the required temperature is reached and as indicated by the green pilot light going out. Baking can then commence.
The ovens have been designed so that they can be assembled from five main sections to make local transportation and installation very simple and quick. Similarly it is also very easy to dismantle and transfer to another site if required. The ovens are made from heat resistant aluminized sheet metal on the inside, whilst the exterior panels are of brushed stainless steel. The base supports and the top edges are finished in red paint to provide an attractive appearance. The most usual arrangement for this rack oven is delivery including two racks with insulated back walls and one rack with a back wall equipped with doors. The hinged doors on this rack have matching red handles. Using the rack with doors provides the choice of using the oven as a deck oven, by hand-loading trays or as a rack oven, loading and discharging a full rack each time. If required, a steam generator is available. The steam generator can be installed to provide sufficient steam for production of sheen and thin crust on products. A stainless steel sheet metal inside of the oven can be supplied. Proving cabinets and coolers are also available if required. Mains supplies are connected to the top of the oven with three phase electricity needed for the circulating fan motor. Gas supply should be based on maximum consumption, depending on the size of oven chosen. Exhaust spent gases and vapor are discharged from the extractor hood mounted over the oven. A drain for the optional steam generator condensate needs to be connected to the back of the oven.
Orders for export are delivered with the oven built and tested as a complete unit. Special foundations are not normally required. The oven should be installed on a level flat surface with sufficient strength for the oven weight. Installation, gas and power supply and water and drainage connection and the provision of flue exhaust are the responsibility of the purchaser. There must be at least 10 cm of free space between any sidewall and the oven, although at the rear 5 cm clearance is sufficient. Above the oven a standard space of 25 cm is required to dismantle the motor (see "maintenance" below).
Normal maintenance is in most cases limited to routine annual cleaning of the circulating fan motor, the electrical control instruments, burners and upper sections of the oven. After the burners have been cleaned, their adjustment and operation should be checked.
The external panels of the oven may be simply cleaned with hot water and detergent. The instruments and electrical switches should only be cleaned when the electricity supply is disconnected and without moisture ingress.
| TYPE OF OVEN | TRAYS | DECKS | TRAY SIZE | PITCH | WEIGHT OVEN | WEIGHT + STEAM | WEIGHT RACK |
|---|---|---|---|---|---|---|---|
| GB-W-12X60/80 | 6 | 6 | 60×80 cm (24"×32") |
20 cm (8") |
690 kg | 870 kg | 150 kg |
| 12 | 12 | 60×80 cm (24"×32") |
10 cm (4") |
690 kg | 870 kg | 160 kg | |
| GB-W-12X75/106 | 12 | 6 | 75×53 cm (30"×20") |
24 cm (9 ½") |
820 kg | 1020 kg | 210 kg |
| 24 | 12 | 75×53 cm (30"×20") |
12 cm (4 ¾") |
820 kg | 1020 kg | 220 kg | |
| - | 6 | bake floor 75×106 cm (30"×42") |
24 cm (9 ½") |
820 kg | 1020 kg | 250 kg | |
| GB-W-12X80/120 | 12 | 6 | 80×60 cm (32"×24") |
24 cm (9 ½") |
910 kg | 1130 kg | 270 kg |
| 24 | 12 | 80×60 cm (32"×24") |
12 cm (4 ¾") |
910 kg | 1130 kg | 290 kg | |
| - | 6 | bake floor 80×120 cm (32"×48") |
24 cm (9 ½") |
910 kg | 1130 kg | 310 kg |
| GB-W-12X60/80 | "A" | Exhaust Flue size | : | 150 mm |
| "E" | Voltage | : | 3× 380/415 Volt +N +E | |
| Motor(s) | : | 1.5 kW | ||
| Frequency | : | 50 Hz (60 Hz) | ||
| Total 3× | : | 16 Amp. | ||
| "G" | Gas | : | Natural / LP gas | |
| Gas pressure | : | 22 mBar / 50 mBar | ||
| Gas Conn. power | : | 48 kW | ||
| Gas Conn. size | : | ½" G. | ||
| WITH STEAM | "K" | Drain Conn. size | : | 25 mm open outl. |
| "W" | Water pressure | : | 2-6 Bar | |
| Water Conn. size | : | 15 mm Copper | ||
| GB-W-12X75/106 | "A" | Exhaust Flue size | : | 200 mm |
| "E" | Voltage | : | 3× 380/415 Volt +N +E | |
| Motor(s) | : | 2.2 kW | ||
| Frequency | : | 50 Hz (60 Hz) | ||
| Total 3× | : | 16 Amp. | ||
| "G" | Gas | : | Natural / LP gas | |
| Gas pressure | : | 22 mBar / 50 mBar | ||
| Gas Conn. power | : | 70 kW | ||
| Gas Conn. size | : | 1" G. | ||
| WITH STEAM | "K" | Drain Conn. size | : | 25 mm open outl. |
| "W" | Water pressure | : | 2-6 Bar | |
| Water Conn. size | : | 15 mm Copper | ||
| GB-W-12X80/120 | "A" | Exhaust Flue size | : | 200 mm |
| "E" | Voltage | : | 3× 380/415 Volt +N +E | |
| Motor(s) | : | 2.2 kW | ||
| Frequency | : | 50 Hz (60 Hz) | ||
| Total 3× | : | 16 Amp. | ||
| "G" | Gas | : | Natural / LP gas | |
| Gas pressure | : | 22 mBar / 50 mBar | ||
| Gas Conn. power | : | 130 kW | ||
| Gas Conn. size | : | 1" G. | ||
| WITH STEAM | "K" | Drain Conn. size | : | 25 mm open outl. |
| "W" | Water pressure | : | 2-6 Bar | |
| Water Conn. size | : | 15 mm Copper | ||
| TYPE OF OVEN | TRAYS | DECKS | TRAY SIZE | PITCH | WEIGHT OVEN | WEIGHT + STEAM | WEIGHT RACK |
|---|---|---|---|---|---|---|---|
| EB-W-12X60/80 | 6 | 6 | 60×80 cm (24"×32") |
20 cm (8") |
690 kg | 870 kg | 150 kg |
| 12 | 12 | 60×80 cm (24"×32") |
10 cm (4") |
690 kg | 870 kg | 160 kg | |
| EB-W-12X75/106 | 12 | 6 | 75×53 cm (30"×20") |
24 cm (9 ½") |
820 kg | 1020 kg | 210 kg |
| 24 | 12 | 75×53 cm (30"×20") |
12 cm (4 ¾") |
820 kg | 1020 kg | 220 kg | |
| - | 6 | bake floor 75×106 cm (30"×42") |
24 cm (9 ½") |
820 kg | 1020 kg | 250 kg | |
| EB-W-12X80/120 | 12 | 6 | 80×60 cm (32"×24") |
24 cm (9 ½") |
910 kg | 1130 kg | 270 kg |
| 24 | 12 | 80×60 cm (32"×24") |
12 cm (4 ¾") |
910 kg | 1130 kg | 290 kg | |
| - | 6 | bake floor 80×120 cm (32"×48") |
24 cm (9 ½") |
910 kg | 1130 kg | 310 kg |
| EB-W-12X60/80 | "A" | Exhaust Flue size | : | 150 mm |
| "E" | Voltage | : | 3× 380/415 Volt +N +E | |
| Motor(s) | : | 1.5 kW | ||
| Heating elements | : | 40 kW | ||
| Frequency | : | 50 Hz (60 Hz) | ||
| Total 3× | : | 63 Amp. | ||
| WITH STEAM | "K" | Drain Conn. size | : | 25 mm open outl. |
| "W" | Water pressure | : | 2-6 Bar | |
| Water Conn. size | : | 15 mm Copper | ||
| EB-W-12X75/106 | "A" | Exhaust Flue size | : | 200 mm |
| "E" | Voltage | : | 3× 380/415 Volt +N +E | |
| Motor(s) | : | 2.2 kW | ||
| Heating elements | : | 64 kW | ||
| Frequency | : | 50 Hz (60 Hz) | ||
| Total 3× | : | 100 Amp. | ||
| WITH STEAM | "K" | Drain Conn. size | : | 25 mm open outl. |
| "W" | Water pressure | : | 2-6 Bar | |
| Water Conn. size | : | 15 mm Copper | ||
| EB-W-12X80/120 | "A" | Exhaust Flue size | : | 200 mm |
| "E" | Voltage | : | 3× 380/415 Volt +N +E | |
| Motor(s) | : | 2.2 kW | ||
| Heating elements | : | 80 kW | ||
| Frequency | : | 50 Hz (60 Hz) | ||
| Total 3× | : | 125 Amp. | ||
| WITH STEAM | "K" | Drain Conn. size | : | 25 mm open outl. |
| "W" | Water pressure | : | 2-6 Bar | |
| Water Conn. size | : | 15 mm Copper | ||
