A: this espresso machine has many configurable parameters. Your
distributor can make sure that all of the settings
are correct for you
prior to the delivery of your GS3. If you elect to receive this machine
prior to this process
you may be required to perform some additional set
up procedures.
This machine is a very heavy duty espresso machine
capable of performance equal to most commercial espresso machines. Therefore
the set up for this machine will also require some of the same processes.
The set up process is described in the Installation Guide that comes
with the GS3.
You can check our website at any time to see if there
are any up dates to the GS3 documentation.
In addition to the
setup procedures listed in the Installation Guide, it may be necessary
to perform the following adjustments:
A: there are two possible solutions to this question. The expansion
valve is not set properly or the pump is not adjusted
for the current
configuration of the machine.
To decide on the course of action please notice the pressure gauge of
the coffee boiler
(this gauge should read between 0 bar to 12 bar). The
gauge will fluctuate during the heating cycle of the coffee boiler.
If
you have noticed the gauge rise to 9 bar or higher during these heating
cycles then the solution will be to adjust
the pump pressure:
If you have not noticed the
gauge rise to at least 9 bar then you will need to check the expansion
valve first.
To check the expansion valve remove the drain grate (not
the whole drain box, just the grate) then activate the brew process
by
pressing button 1.
While water is exiting the group head please notice
the expansion valve. If water is discharging in a stream
then you will
need to adjust the expansion valve:
The expansion valve is shipped in the relaxed position to avoid any damage to the seals the inside this valve.
Since shipping conditions can vary (temperature, humidity, pressure, etc.) it is important that this valve remain in the open position during shipping. To achieve the initial setting you must turn the expansion valve cover approximately 5 turns in the clockwise direction (looking from the bottom of the valve). You may see a small mark in the outside of this cover.
Please align this mark so it is facing you. As the machine heats up, please follow the Periodic Adjustment procedure.
Periodic Adjustment:
The expansion valve may need to be adjusted periodically. The pressure
in the coffee boiler should never exceed 12 bar. Additionally the expansion
valve should not be set too low or it will limit the maximum pressure
delivered by the water pump. During the heating cycle the water inside
the coffee boiler will expand. This expansion will cause an increase
in pressure within the coffee boiler. The expansion valve limits the
maximum pressure within the coffee boiler.
To adjust the expansion
valve, rotate the expansion valve cover to adjust the pressure. Rotate
clockwise to increase pressure,
and counterclockwise to decrease pressure.
NOTE: The expansion valve should only be adjusted during the heating cycle. This is best done when the machine is turned on after being off for at least 20 minutes.
To adjust the pressure you must first remove the left side cover. Once the side cover is removed, you will have access to the water pump adjustment screw. Loosen the adjustment screw lock nut and turn the adjustment screw clockwise to increase pressure or counterclockwise to reduce pressure.
Note: It is necessary to adjust the pump pressure when changing the
configuration from a water reservoir
to a water supply system (or vice
versa).
A: the GS3 is equipped with a temperature adjustment valve for the
tea water.
You can access this adjustment knob by sliding your hand on
the bottom edge of the right side panel toward the front
of the machine.
You can see this knob if you look at the bottom right side panel.
Rotating
the adjustment knob clockwise to increase temperature and counterclockwise
to decrease temperature.
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