Marco MAXIBREW 2, Руководство по обслуживанию

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Service Manual MAXIBREW 2 TWIN 25-03-08 Page 20 of 31
4. Technical Data:
4.6. OPERATI ON – HEA T FILL MODE:
Turn the water on at the stop valve and switch the power on at the wall connection. The sightglass lamps will now
illuminate. Press the POWER ON button at the front of the machine. A red LED next to the button will illuminate and
the machine will start to fill. This LED will flash a 2 flash cycle while the water level is below the low probe.
Note: The machine will not heat until the water has reached the low level probe.
When the low-level probe is reached, the water inlet is stopped and the element is switched on. This water is heated to
the pre-set temperature (92– 94.5°C). The machine takes in another small body of water, while continuing to heat. This
method of staggered filling (heat-fill cycle) ensures that the temperature in the tank remains within 3 degrees of set
temperature. This heat-fill cycle continues until:
a) the water level reaches the high level probe and
b) the water temperature reaches the pre-set temperature as above.
Note: When the level of water is at a safe height above the low level, the green READY TO BREW light illuminates. This
indicates that the machine has enough water to run a brew and is at the correct temperature. The machine is NOT full
at this level. A brew can be selected, but no water is available out of the Hot Water Tap. Unless a brew is selected, the
full quantity of hot water should be available within 15/20 minutes of reaching this level.
The machine is ready to brew Coffee and up to 20litres of Hot Water is available for immediate draw-off when the
machine is full and up to temperature.
There is one large water tank, with two urns recessed into it. When a brew is selected, hot water is pumped from the
tank up to a sprayhead and into the filter basket. The coffee runs out of the filter basket into the urn. Since the water
tank surrounds the urn, the brewed coffee is kept at temperature.
The heat fill cycle ensures that the temperature in the tank does not drop by more than 3 degrees. The machine will
only allow small amounts of cold water into the tank, while continuing to heat to ensure that the temperature does not
drop too low.
If more hot water is used than the machine can recover (approx 0.9l/min @ 5.6kW ; approx 1.4l/min @ 8.4kW), the
amount of water in the tank decreases. If the full quantity of Hot Water is drawn off, the machine will take
approximately 15min to recover back up to the high level probe.
Note: brews can still be selected when no Hot Water is available out of the tap. This is due to a buffer of hot water
beneath the level of the ‘hot water stand pipe’ inside the tank. These should preferably be half brews rather than full
brews to ensure shorter recovery times.
When two brews are running simultaneously, the level of the water in the tank does drop slowly, because the machine is
using water at a quicker rate than it can heat. If dual brews are selected at a point where there is no water available at
the hot water tap, the level of water will drop off the BREW SAFETY LEVEL PROBE. If the water level is below this
probe – a new brew cannot be selected. The current brews will be completed, but a recovery period will be necessary
before brews can be selected, or hot water is available. After a recovery period (up to 15min), the machine will be ready
to brew once again. Note: a longer recovery is required before any substantial amount of Hot Water can be drawn off.
In the HEAT-FILL mode - drawing off Hot Water while brewing Coffee should not affect the quality of the brew. The
machine naturally gives priority to the coffee. The machine will effectively run out of hot water (no water will be
available out of the hot water tap), but brews can still be selected.