Cornelius 326142000 service manual Theory of Operation, Defrost Systems

Table 1. Design Data (cont’d)	Table 1. Design Data (cont’d)
Overall Dimensions:	Overall Dimensions:
Height	60-1/2 inches
Width	19-1/4 inches
Depth Without Drip Tray	32-1/2 inches
Depth With Drip Tray	38 inches
Shipping Weight (approx.)	466 pounds
Compressor Horsepower	2 H.P.
Refrigeration System:	Refrigeration System:
Refrigerant Type	R-502
Refrigerant Charge	See Unit Nameplate
Ambient Operating Temperature	40° F to 100° F
Electrical Requirements:	Electrical Requirements:
60 Hz Unit:
Operating Voltage	219/242 VAC60 Hz Single Phase
Current Draw	21.2 Amps
50 Hz Unit:
Operating Voltage	219/242 VAC 50 Hz Single
	Phase
Current Draw	22 Amps

THEORY OF OPERATION

(see Figure 2)

IMPORTANT: Before connecting electrical power to Unit, refer to nameplate and note if Unit is to be operated with 50 or 60 Hz power source and also note beaters drive motors manufacturer’s name. No. 6, No. 7, and No. 8 switches on DIP switch assembly on master circuit board must be set according to motors manufacturer and for 50 or 60 Hz operation.

A CO2 cylinder delivers carbon dioxide (CO2) gas to an adjustable primary CO2 regulator assembly attached to the cylinder. Primary CO2 regulator assembly in turn delivers CO2 gas to adjustable secondary CO2 regulators inside the Unit and also to two soft drink tanks. CO2 is delivered from adjustable secondary CO2 regulators to carbonator tank and also two product-blender tanks inside the Unit. CO2 gas pressure pushes syrup out of soft drink tanks, through syrup sold-out float switches, through electrically-operated syrup solenoid valves, through adjustable syrup flow regulators, and on to product blender tanks. At the same time, plain water passes through water pressure regulator and is pumped into carbonator tank by water pump and is carbonated by CO2 gas pressure also entering tank. Carbonated water is pushed by CO2 gas pressure from carbonator tank, through electrically operated carbonated water solenoid valves through adjustable carbonated water flow regulators, and on to product blender tanks. Carbonated water and syrup enter tanks properly proportioned (blended) for desired BRIX of dispensed product by adjustment of syrup flow regulators. From product blender tanks, product is pushed by CO2 gas into freeze cylinders. The beater in each freeze cylinder is driven by an electric motor. Scraper blades, attached to beaters, scrapes product from cylinder walls as product enters freeze cylinders and is frozen. Transparent faceplate, attached to front of each freeze cylinder, includes a self-closing dispensing valve and a spring-loaded relief valve that protects freeze cylinder from accidental over pressure. The relief valve is also used to bleed CO2 gas pressure from freeze cylinder to atmosphere when filling cylinder with product. Electronic sensing on each freeze cylinder motor provides a means of adjusting viscosity (consistency) of dispensed product to suit customer preference.

DEFROST SYSTEMS

The Unit is equipped with both manual and automatic hot-gas defrost systems. The automatic defrost system may be programmed into Unit to occur up to nine different times a day with a minimum of two hours between defrost time settings or the system may be completely turned off.

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