Jofemar Coffeemar G-250, Technical Manual

Page: 17 / 95

Coffeemar
G-250
// Coffee
MNP116M01GBV00 Date: 09/04/2013 Rev. 1 PAGE 17 OF 95
Brewing assembly
This is the mechanism that pushes the water through the coffee. It uses a mechanical
cam lever system driven by a 43 W motor, with a speed of 8 r.p.m and a power supply of
220 V and 50 Hz (110-125 Vac, 60 Hz) that follows the working cycle described below:
1.
When the doser coil is enabled it opens the doser and the coffee falls through gravity
inside the coffee assembly infusion chamber.
2.
The coffee assembly goes into to infusion position (it is initially in standby position).
This takes place when the motor for the relevant assembly is activated to move the lower
filter up to the closure of the infusion chamber to compress the ground coffee into a puck.
3.
The water comes out of the air-break, where it is kept at a constant level, and it is
pumped into the boiler. The same amount of water, already heated, is sent to the coffee
assembly after a solenoid valve is enabled. The water comes into contact with the coffee
in the chamber and infusion takes place. The coffee is then sent to the cup.
4.
The used grounds puck is discarded through the coffee grounds outlet.
5.
The coffee assembly returns to standby position and the cycle is complete.
This assembly allows for brewing of coffee doses between 5 g and 8 g ±0.5 g. (0,011 lb
and 0,0176 lb ±0,0011 lb) Depending on the amount of coffee desired, the brewing
chamber has two positions, to allow for proper compression. It is recommended that, for
amounts between 5.5 g (0,0121 lb) and 6.5 g, (0,0143 lb) the brewing chamber be
placed in the lower position and for quantities between 6.5 g (0,0143 lb) and 7.5 g,
(0,0165 lb) in the upper position.
To change the position of the brewing
chamber, loosen the four screws that hold
it in place and move it, fitting its teeth into
the desired position and then tighten the
four screws again (see fig. 20).
A.
Brewing chamber assembly
B.
Infusion chamber
C.
Left side screws
D.
Left side tab
Fig. 20
The brewing assembly has two metal filters located as follows: The lower filter is located
in the infusion chamber, and the upper filter in the brewing chamber. These filters should
be cleaned periodically. To do this you need to remove the coffee assembly, following
the instructions indicated in
section 8
of this manual and put the assembly under running
water, making sure the filters are properly washed.