Bunn ES2SA Features, Hot Water Rinse Dispensing Tube And Steam Dispensing Tube, Water Feed Tap

BUNN Espress™

FEATURES

ES•2A™/ES•2SA™

HOT WATER RINSE DISPENSING TUBE AND STEAM DISPENSING TUBE

The ES•2A™ ES•2SA™are equipped with a hot water rinse dispensing tube and two steam dispensing tubes. The Hot Water rinse dispensing tube is controlled by a knob centrally located on the front of the brewer. The Steam dispensing tubes are controlled by knobs located on the left and right side of the brewer, right knob controls the right side steam tube and the left knob controls the left side steam tube. They can be placed in a continuous flow position by turning the knobs approximately half way around. All three outlet tubes possess a rotary ball and socket type fitting for manual positioning.

WATER FEED TAP

This tap is of the automatically closing type. To introduce water into the tank, turn the control to the left or right, indistinctly and hold it in position. When you release the control, it will automatically close.

LEVEL

Water level should never rise above the maximum level zone (+) and never descend below the minimum level zone (-), as this may result in the heating element to melt. The optimum water level zone is indicated with (N). In the models with electronic water level control for the tank, The optimum water level (N) is maintained automatically.

Tank

The tank is made of copper plate, 1.5 mm thick and its components are made of cast or drop forged brass. The tank cover is fixed to the tank by bolts with exterior nuts to facilitate its removal. The operating pressure of the tank when in use should fluctuate between 0.9 and 1.2 bar as indicated on the tank pressure gauge with no air inside the tank. Whenever the machine is pressurized, the pressure indicated on the gauge should be checked to make sure it is the correct pressure. A pressure drop of 0.1 to 0.2 bar is considered normal. If there is an abnormal amount of air in the tank, a very quick pressure drop will be observed on the pressure gauge when one of the steam knobs are turned and steam is released. After a few moments, the real tank pressure can be read on the gauge.

The difference of 0.9 to 1.2 bar, i.e. 0.3 bar, allows the effective exchange required to maintain the optimum temperature in the units.

However, it is necessary that the installer, when installing the machine, decide at the installation site itself through the performance of the corresponding tests, the adequate thermal point or correct pressure, keeping in mind the working conditions of the machine, the hourly production rate required and the room temperature.

PUMP SET

The pump set is made up of a vane type, volumetric pump driven by a 0.25 HP single-phase motor, supplied at 220 v-60 Hz.

If the water pressure exceeds 7-8 bar, a pressure reducer should be placed between the water line and the pump set to reduce the output pressure of the water line to between 3-4 bar, which will be the pump set water feed input pressure.

The output pressure of the pump of the pump set should be between 8-9 bar as a maximum. To check this pressure, fill the cup of the coffee filter holder with pressed coffee and place it in any one of the infusion units, press the continuous flow button and read the pressure on the feed line pressure gauge. If the gauge does not show the previously mentioned values, the pump set’s delivery pressure should be adjusted. This is done by loosening the screw to reduce pressure. Adjust said screw until the desired pressure is obtained. The adjustment screw should only be turned very slowly.

NOTE: Pump motor needs to be 1/4 -1/5hp, 1725 rpm, 230 volts, carbonator style, U.L. recognized

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