Fetco CBS-51H10 User Manual page 9

Timing System:
The timing system consist of the timer and the dispense latch assembly.
When the brew handle is rotated from the stop to the brew position, it pushes the plunger in the latch coil and
closes the micro switch, and the timer starts the timed cycle. It also starts the hot water flowing.
The timer energizes the dispense latch coil, which acts as a magnet, to hold the brew handle in the brew position.
It also lights the brew light. The coil remains energized throughout the brew cycle timed sequence.
When the timer finishes its cycle, it removes voltage from the latch coil. The latch coil then releases the brew
handle, a spring returns it to the stop position, and the flow of water stops. This return opens the micro switch,
stopping voltage from going to the timer. The brew light and the timer are disabled, and wait for the brew handle to
engage the next brew cycle.
Dispense System:
The dispense system is completely mechanical. It is one of the areas that makes FETCO's brewer truly unique.
(See the illustration in this section.)
When you rotate the brew lever down to brew, the end of the dispense tube is submerged in the hot water tank. It
is held in the brew position by the magnetic action of the dispense latch coil.
The brew water travels down the dispense tube to the sprayhead assembly. The rate of flow over the coffee is
controlled by the flow disc above the spray cutter. The standard hole in the flow disc is .240", except for the CBS-
51H10, which is .219". Other flow discs are available for special situations like high levels of by-pass.
The sprayhead can be assembled incorrectly during cleaning. Refer to the cleaning label on the brewer for proper
assembly. The flow disc has the flange down, flat side up. The six triangle spray cutter has the flange up. The
eight hole spray cutter used in place of the triangle cutter goes bumps down.
A bypass valve and tube are connected to the sprayhead. This valve directs brew water around the outside edge of
the filter paper. The by-pass valve is shipped in the closed position from the factory. Each time the valve is
adjusted, the brew volume is affected. Adjustment of the by-pass valve is for flavor only.
When the timer circuit releases the brew latch, the dispense tube pops back above the hot water level. The
remaining brew water drains from the dispense system leaving it free of standing water. Steam escaping from the
brew tank through this tube inhibits the formation of lime in the brew system.
The dispense system is clean & semi dry for all but the brief time required for the brew cycle. This eliminates any
chance of lime build-up affecting the brew cycle.
It is very easy to dislodge the dispense tube seals while servicing the dispense system. If you see it leaking
profusely, remove the nut and dispense tube. Reset the seal fully into the recess and carefully insert the dispense
tube. Then secure the locknut before you back the tube into position. (See detailed instructions on page 10.)
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