Cornelius R-134A service manual Theory Of Operation

THEORY OF OPERATION

(see applicable Figure 2 or 3)

WARNING: CO2 displaces oxygen. Strict attention must be observed in the prevention of CO2 (carbon dioxide) gas leaks in the entire CO2 and soft drink system. If a CO2 gas leak is suspected, particularly in a small area, immediately ventilate the contaminated area before

attempting to repair the leak. Personnel exposed to high concentration of CO2 gas will experience tremors which are followed rapidly by loss of consciousness and suffocation.

NOTE: The six-flavor (see Figure 3) Unit was set up at the factory to dispense a still (noncarbonated) drink from No. 3 dispensing valve and carbonated drinks from the remaining dispensing valves.

A CO2 cylinder delivers carbon dioxide (CO2) gas through adjustable CO2 regulators to applicable syrup tanks or bag-in-box syrup system syrup pumps and to a built-in carbonator located inside the Unit. Plain water is pumped into the carbonator carbonated water tank by a water pump and is carbonated by regulated CO2 gas pressure also entering the tank. When a dispensing valve is opened, CO2 gas pressure exerted upon the syrup tank or on the bag-in-box system syrup pump, pushes syrup through the Unit syrup cooling coils, and on to the dispensing valve. Carbonated water is pushed by CO2 gas pressure from the carbonated water tank and passes through the Unit carbonated water cooling coils, and on to the dispensing valve.

Syrup and carbonated water meet simultaneously at the dispensing valve resulting in a carbonated drink being dispensed. On the six-flavor Unit, a still (noncarbonated) drink is dispensed from the No. 3 dispensing valve in the same manner as the carbonated drink except plain water is substituted for carbonated water.

The carbonated water tank is replenished when the carbonated water level inside the tank drops, which in turn automatically starts the carbonator water pump. When the carbonated water level inside the tank has been re- plenished, the carbonated water pump will stop.

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