Service - Fetco CBS-52H User Manual

CAUTION
•
Do not remove the brew basket immediately after the brew cycle has finished. Wait until
dripping from the bottom of the brew basket has stopped. Carefully remove the brew basket
while inspecting the inside of the basket for hot coffee that may have been trapped or has not
finished draining.
Warranty
All FETCO brewers come with a limited warranty. All warranty service must be pre-authorized by calling the
FETCO Service Department at (800) 338-2699.
Principles of Operation
Fill System
The fill system consists of a liquid level control board, a water level probe at the top of the tank, a fill valve, and a fill
tube. As the water rises and touches the probe, continuity is established between the probe tip and the tank body,
and the fill valve closes.
When water is dispensed, the water level drops below the probe. After a 5 second delay, the fill valve opens until
the water touches the probe again.
The 5 second delay, and the speed that water refills the tank during brewing, results in many short bursts of water.
The sound made by these repetitive bursts will let you know the fill system is functioning normally.
The fill system is designed to protect the heaters during both the installation and a loss of the water supply. During
initial installation, or whenever the power switch is turned on, voltage will not be supplied to the thermostat until the
tank fills and water touches the water level probe.
During operation, when water is dispensed and the water level drops below the probe, a fill signal is sent to the fill
valve. If the probe senses no water after 40 seconds, the voltage to the thermostat and the heaters is removed.
Water enters the tank through the fill tube. A hole is drilled in the upper portion of the fill tube to prevent water from
being siphoned from the tank. The fill tube extends to the bottom area of the tank. This introduces cold incoming
water directly to the heaters and away from the dispense assembly.
The water tank can be drained through a valve located inside the lower compartment of the brewer.
Temperature System:
The temperature system consists of an electronic thermostat, a temperature probe, solid state relays (SSR), and
heating elements, and is enabled by the liquid level control board. (See the previous section - Fill Circuit.)
When the water level probe is in contact with water, power is delivered to the thermostat through the liquid level
control board. If the temperature probe senses that the water is not hot enough, the thermostat energizes the
heating elements through the solid state relay (SSR), the water is heated, and the ready light goes off.
Once the water temperature reaches the set point, the thermostat disengages power to the heaters and the ready
light illuminates.
The thermostat is adjusted to 205° F ± 2° at the factory. (Slightly lower for high altitude installations.)

Service

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