Domobar Super 2B - The Coffee Address

Domobar Super 2B
user’s guide
Summary
1. Unpacking and Assembly
5
2. Water
8
3. Connect the machine
9
3.1. Water income: water reservoir (tank version only)
3.2. Water income: direct connection to existing water lines (plumb in only)
3.3. Water outcome: drip tray (tank and plumb in version)
3.4. Water outcome: direct connection to existing drain system (plumb in version)
4. Start up
4.1. Start up: plug the machine
4.2. Start up: filling the boiler
4.3. Start Up: manual grouphead (manual version)
4.4. Start Up: electronic grouphead ( electronic version)
4.4. Start up: boiler pressure gauge
4.5. Start up: brew pressure gauge
9
10
11
11
12
12
13
14
14
16
16
5. First use of machine
17
6. Pressurestat Adjustment (HX and 2B version)
18
7. Temperature Adjustment (only 2B version)
19
8. Hints, Tips, and Tricks
20
8.1. Maximizing Steaming Power
8.2. Minimizing Temperature Variations During the Pull
8.3. Minimizing Mineral Buildup
2
9. Troubleshooting
22
10. Cleaning and Maintenance
25
Waste disposal
31
9.1. The machine is not working
9.2. No water can be pumped
9.3. The Grouphead is not getting very warm
9.4. I can pump water, but the water is always cold
9.5. The Machine Stopped Suddenly in the Middle of a Pull
9.6. The Coffee Tastes Bad
9.7 The Brew Pressure Gauge Acts Erratically
10.1. After Each Pull
10.2. After each stratching milk
10.3. After Each Session
10.4. Backflushing
10.5. Cleaning the Portafilter and Filter Basket
10.6. Exterior Cleaning
10.7. Grouphead Gasket Replacement
10.8. Hot Water Wand and Steam Wand
10.9. Long Term Storage
22
22
22
23
23
23
24
25
25
26
27
28
28
29
30
30
20
20
21
3
1. Unpacking and Assembly
CAUTION: Vibiemme Domobar espresso machines are quite heavy. The shipping weight is around 70
pounds! We recommend getting assistance whenever the machine has to be moved or relocated. Open
the box and carefully remove the machine. Setting the box on a carpeted surface or on a large, soft towel so
that the machine has its backside down makes it easier to slide it out of the box (as shown here, to the left).
CAUTION: The machine ships with the hot water valve closed and the steam valve open. DO NOT force
the valves. Moderate pressure is sufficient to open or close the valves. They do not have to be shut tight, or
“seated,” like a home faucet to seal properly.
Slip off the large plastic bag and remove the end of the power cord from the parts box. Slide the parts box
sideways to remove it from its shipping location.
Please inspect the machine upon unpacking to be sure it was not damaged during shipping. Report any
shipping damage immediately to the shipper as well as to your reseller/retailer.
WARNING: There are times when a machine will dribble water during shipping. If you notice that
the machine arrives wet or dripping, remove the machine as described in this section, but wait
24 hours to allow excess moisture to evaporate to alleviate any electrical danger or damage from
short circuits. If in doubt, open the case as described later in this manual to assist in drying as well
as to inspect for accumulated water in the machine.
You may notice that there is a rough area on the right side of the Grouphead where the chrome is
not quite as smooth and shiny as the rest of the Grouphead. This is from the production process
and is not a defect.
Stand the machine upright and remove the five pieces of tape- three holding the top Cup Warmer Tray
and two holding the Drip Tray Cover. Remove the Cup Warmer Tray and take off the protective
plastic wrap and the white, stick-on protective plastic on the tray itself. Clean any remaining adhesive or
bits of plastic from the warming tray with a cleaning product meant for stainless steel.
Inspect the area of the inner panel under the Cup Warmer Tray. There should be a small black plug
inserted in the panel. If not, it is possible that it fell into the machine during shipping. If the plug is not
visible, remove the six slotted screws (three on each side of the back panel) and slide the panel off to
the rear of the machine. It can help if you spread the front of the panel just enough get it to slide easily.
4
5
Replace the back panel when the plug has been retrieved.
To replace the Cup Warmer Tray, hold it at a sloping angle with the front edge lower then the rear.
Lower the front edge in place, and then lower the back edge until it hooks the back edge of the machine.
Return the shipping materials, packing, plastic bags, padding, and boxes to their original locations and
save them. Should the machine need to be shipped in the future, it must be repacked in its original box
to avoid damage.
CAUTION: Do not plug the machine in at this time!
The Drip Tray Cover has a front and a rear side. The rear side (the edge facing away from you that sits
up against the front of the face of the machine) has a cutout in the corner as shown here.
Where you place your machine is important. The size and weight of Vibiemme Domobar espresso
machines is such that having it in a location where it will not need to be moved is highly recommended.
One of the first considerations is placing the machine where you will have access to the water reservoir.
Locating the machine under a low overhead cabinet will make access to the water reservoir nearly
impossible. Easy access to a sink for disposing the drip tray’s contents as well as washing various parts
after use is a good idea, but don’t place it so close that washing dishes and other such chores will cause
splattering on the machine which could leave difficult-to-remove stains. You should also allow room to
have the grinder close by the espresso machine. Logically, there needs to be an electrical outlet that can
handle the load from the machines. If the circuit breaker trips when using the machine, you should use
another circuit. If you have any doubts, please consult an electrician for professional advice. The circuit
needs to be protected by a GFCI and have surge suppression of 10 amper.
The other items in the box are as follows:
1 - a double Portafilter with double basket
2 - a single Portafilter with single basket
3 - a Blind Filter Basket for cleaning chores
4 - a Grouphead Brush for cleaning the shower screen and grouphead gasket
5 - a Coffee Measure
6 - a Plastic tamper
7 - a Pressuresta Adjustment Knob
It is best to just place the tamper back into the small packing box as it should not be used. We highly
recommend a proper-sized tamper for best results. All Vibiemme Domobar espresso machines use a
commercial-sized 58mm filter basket.
Upon careful inspection you may find some water stains or wet spots on your new Vibiemme that make
the machine appear used. These spots are from testing at the factory to assure that the machine is
operating properly before shipping.
NOTE: Be aware that once the machine is in place it will be quite difficult to move on
the counter because of the non-skid feet. Carefully chose a location for the machine.
6
7
2. Water
3. Connect the machine
All coffee beverages start with two things- coffee and water. Because the majority of espresso is water, it
should come as no surprise that quality water is important to the taste of the espresso. Additionally, using
the wrong water can eventually cause problems for your machine and even cause part failures. So what
water to use? None of the Vibiemme Domobar espresso machines can use distilled or reverse osmosis
(RO) water because these waters contain virtually no minerals. The water level sensor in the boiler needs
a small amount of minerals to sense the water level. Without these minerals the boiler will be overfilled
and that can cause numerous problems, and can even damage the machine. On the other hand, water
too high in mineral content or water containing the wrong minerals can cause rapid buildup of lime and
calcium deposits that can reduce boiler volume, cause poor heating performance, and can eventually lead
to heating element failure.
Water hardness test strips are available that can be used to make sure that the water you are using is safe
for your machine. Inexpensive TDS meters are also readily available for purchase and these can be used
to test the hardness of your water. If you find that your water is too hard, we recommend using either an
in-tank replaceable water softener cartridge that attaches to the inlet hose!
If you don’t want to deal with filtering water in the pitchers then another solution is to install an in-line,
under-the-sink water filter designed to filter water to be used in espresso machines. Check with your
retailer/reseller for more details on which of these filter systems would work best for you.
The Vibiemme Domobar espresso machine has dual system for both incoming and outgoing water.
In relation to the purchase version (Tank or Plump in) here follow combination of water in-out water
outcome:
• Vibiemme Domobar espresso machine with water reservoir (tank version)
- water income: water reservoir
- water outcome: drip tray
• Vibiemme Domobar espresso machine direct connect to existing drain system (plumb in)
- water income: direct connect to existing water lines
- water outcome: drip tray or direct connection to existing drain system (switchable)
3.1. Water income: water reservoir (tank version only)
To access the reservoir, use the two handles to lift the Cup Warming Tray off the machine and place the cover aside.
The Water Reservoir, located in the rear of the machine, has two hoses inserted into it. Pull them out of the tank
and lift the reservoir out of the machine. Use a small amount of mild detergent and warm water to wash the reservoir,
and rinse thoroughly to remove all traces of soap. Never use any abrasive scrubbing pads or brushes on the reservoir
as they will leave scratches in the plastic which may eventually harbor micro organisms. The water reservoir should
be washed in this way every two weeks or so to help prevent the growth of any undesirable organisms in the water.
Replace the Water Reservoir in the machine. Be sure that both hoses enter the reservoir correctly and are not kinked
or pinched. Once you have verified that your water quality is appropriate for use in an espresso machine, fill the Water
Reservoir. A funnel is recommended to prevent spilling water into the machine. Do not overfill. Filling it to just below
the level where the hoses enter the reservoir is fine.
Replace the cap on the reservoir. Get into the habit of regularly checking the reservoir’s water level. The large capacity
will not need filling as often as smaller machines, so it can be easy to forget to check the water level. Don’t worry. The
8
9
microswitch under the reservoir will temporarily disable the machine, including the heating element, if the water level
gets low, and the Low Water Indicator Lamp will be illuminated on the front panel alerting you to the situation. If this
occurs, simply refill the Water Reservoir.
Replace the Cup Warming Tray and confirm that the steam valve and the hot water valve are closed. DO NOT tighten
the valves until they stop. Lightly hand tighten only: be sure that the brew lever is in the full down position.
3.2. Water income: direct connection to existing water lines (plumb in only)
On plumb in version the stainless steel hose water charge is already connect from the factory then:
• Angle the machine upward by holding the grouphead.
• Connect the other side of the pipe (3/8 gas) to your existing water lines.
• Place the machine down again, open the tap of your existing water line, and check the bars on the brewing
pressure gauge. The gauge will read the incoming water pressure even when the machine is off.
IMPORTANT: make sure the incoming pressure is not above 4 bar; if this happens, install a pressure reducer.
As seen in chapter 3.4 of your other manual, the right pressure to brew espresso is between 9 -9.5
bar: this is the bypass setting of motor-pump. If the incoming water pressure is more than the bypass
pressure, the brewed water flux will hit the coffee grounds too violently, over-extracting it.
Over-extraction will negatively influence the physical and chemical coffee values.
10
3.3. Water outcome: drip tray (tank and plumb in version)
To connect the Vibiemme Domobar espresso machine ( plumb in version) to your existing drain system,
take the removable drip tray cover off for approx. half of its length, then:
• Remove the cap (right side within the drip tray).
• Insert the drip tray coupling fitting, pressing it until it can go no further.
• Put the drip tray completely in, so that the drip tray coupling fitting inserts itself inside the rubber holder
fitting already on the machine.
• Return the drip tray cover to its original position.
• Angle the machine upwards by holding the grouphead, connect the drain tube to the rubber holder
fitting (the one on the right) then connect the other side of the pipe to your existing drain system.
IMPORTANT:now your Vibiemme Domobar espresso machine will drain the waste water through your
existing drain system. Do not open the drip tray while you are using this drainage system as you may
loosen connections and cause water leaks.
Vibiemme is not responsible for any damage due to an incorrect use.
3.4. Water outcome: direct connection to existing drain system (plumb in version)
To connect the Vibiemme Domobar espresso machine ( plumb in version) to your existing drain system,
take the removable drip tray cover off for approx. half of its length, then:
• Remove the cap (right side within the drip tray).
• Insert the drip tray coupling fitting, pressing it until it can go no further.
• Put the drip tray completely in, so that the drip tray coupling fitting inserts itself inside the rubber holder
fitting already on the machine.
11
4. Start up
4.2. Start up: filling the boiler
Locate the Portafilter you wish to use. Your machine came with two- a smaller, single portafilter (shown
here on the right) as well as the larger, double portafilter (left). The single is meant to create about one
ounce of espresso at a time, and the double creates about two ounces- a double. The double portafilter
can also be used to make two singles at one time.
The first time you lock the portafilter in place, you might find that it takes significant force to get it tight.
The proper position should have the portafilter handle pointing roughly straight towards you, perpendicular
to the front of the machine. This properly seats the gasket and shower screen into place. Leave the
portafilter in place while the machine is warming up. This allows the portafilter to warm up the same as
the rest of the machine.
Place a few cups that you will be using on top of the machine. The heat from the machine’s normal
operation will preheat the cups which will in turn keep your beverage warm as you enjoy it.
Within a second or two after turning the Power switch to position I you should hear the pump engage. The
sound of the pump indicates that the electronic water level control has begun to fill the boiler.
When the boiler is filled to the level determined by the water level sensor, the autofill electronics will turn
the pump off. When the machine arrived, the boiler was empty, so it may take as long as two minutes to
fill the boiler. After the pump stops, check and refill the Water Reservoir (unless plumbed-in) as it will have
pumped about half of its contents into the boilers. You will know when the boilers are filled to the proper
level because the pump will stop operating.
As the machine begins to warm up you may notice a slight hissing sound coming from inside the machine.
This is normal. It is the antivacuum valve. This valve opens as the machine cooled off the last time it was
used to allow air to be drawn into the boiler to prevent a high vacuum being formed which can damage
the machine. When the machine starts up, it takes a little pressure to close this valve, and until it closes
completely it may hiss slightly.
Wait about five minutes for the boiler to gain some heat. You should notice that the Boiler Pressure Gauge
is indicating that pressure is rising, and when it gets into its operating range you will hear the pressurestat
clicking on and off as it cycles in response to the boiler pressure.
CAUTION: Do not place items on the top of the machine that are prone to drip or spill or might be
sensitive to heat. Temperatures on top of the machine reach about 63 C (145 F).
CAUTION: While the boilers are coming up to pressure for the first time you should stay close by to
monitor its progress to be sure that all is as it should be.
4.1. Start up: plug the machine
Plug the machine into a surge suppressor capable of handling 10 amper (not included). The outlet must be
properly grounded and should be protected with a GFCI (ground fault circuit interrupter).
Make sure that the Manual Control Lever if in the fully-down position, pushed back nearly against the front
of the machine. Turn the Power switch to position “COFFEE ON”. The Power Lamp on the far right side of
the front panel will illuminate, indicating that the machine is getting power.
WARNING: The Grouphead and other external parts will get hot enough to cause burns.
Use caution when using the machine and if there are any small children in the home (or adults
not accustomed to such appliances) make sure that they are aware of the dangers. Shiny chrome
surfaces invite curious hands!
CAUTION: Electrical surges can damage the Vibiemme Domobar electronics. Surges can also damage
the heating element. Damage caused by electrical surges is not covered by warranty.
12
13
4.3. Start up: manual grouphead (manual version)
The Vibiemme Domobar espresso machine is manual in its function with only one switch controlled by
a lever on the grouphead itself. Here you see the Manual Control Lever on the right side of the E- 61
Grouphead. It is shown in its at-rest position. This is where the lever should be whenever the machine is
not brewing espresso.
When the lever is lifted just past the first click stop, the passive pre-infusion begins. This allows a slight flow
of water onto the coffee. This gentle flow of water wets the puck slightly, which helps with extraction and
can also help eliminate channeling (disruption of the coffee causing a fast flow). It is not necessary to use
this position, but leaving it in this mode for about two or three seconds can be useful.
Lifting the Manual Control Lever to its full up position closes the 3-way valve and opens the brewing path
between the heat exchanger and the coffee. At the same time, the cam to which the lever is attached
depresses the switch on the front of the Vibiemme (just to the right of the E-61 grouphead, behind the cam).
This switch activates the pump.
When you choose to end the brewing cycle, return the Manual Control Lever to its at-rest, fully down
position. Moving the Manual Control Lever to this position turns off the pump and opens the manual 3-way
valve which is built into the grouphead.
This is a path from the grouphead down through the lower portion of the casting, and into the drip tray.
When opened, it allows the pressure remaining in the brewing path to flow into the drip tray. This allows you
to immediately remove the Portafilter without worrying about the “portafilter sneeze”- a spurt of coffee or
hot water from confined pressure as can happen on lesser machines without a 3-way valve.
4.4. Start up: electronic grouphead (electronic version)
The electronic version features an advanced system to control the brewing cycle. This model can be
identified by the five buttons across the front panel. The first four buttons choose the brew volume.
The first pair of buttons are for single shots (a short-single and a normal single volume) and the next two
choose the volume for double shots (a short double and a regular double), but you can use them any way
you like as described below.
The button furthest to the right (the fifth one in line) has multiple functions. First, you can use it to start
and stop the brewing process just like the semi-automatic described above. Momentarily press and then
release the button and the brew cycle begins. When you want to stop the brew cycle press and release
the button again.
14
As a novice barista with the Vibiemme Domobar espresso machine, this is the best mode to use until you
become more comfortable with the machine and the process.
As you progress and your espresso becomes a bit more consistent from day to day, you will be ready to set
and use the programmable buttons. The following process works the same way for each of the four buttons.
Let’s follow the procedure on how to program one button, and then you can repeat the process as needed
for the other three buttons:
1 - Prepare for a pull as usual - grind, dose, tamp, and lock the portafilter in place (covered in detail
later in this manual).
2 - Depress and hold down the “Manual” button (indicated here) until the green signal lamp directly above
the button begins to blink, then release the button. Before the blinking stops, depress one of the four
programmable buttons that you wish to program. The brew cycle begins as soon as you press the button.
3 - When the amount of time you choose has elapsed, press the same programmable button again to stop the
brew. That’s it! That button is now programmed, matching the amount of time of the pull you just concluded.
After you stop the brew cycle during this programing mode, it takes about twenty seconds for the
electronics to “remember” the programming just completed. During that time do not use the machine or
the programming just completed will be lost.
You can now repeat the programming process for the other three buttons if you choose.
Use of the programmed buttons couldn’t be easier! Get ready to make espresso as usual, then just place
a cup under the spouts and press the programmed button of your choice. The pull begins and ends with no
further attention needed. When using a programmed button the pull can be stopped at any time by pressing
the manual (fifth) button.
It is important to note that the buttons are set by time of brewing and not volume of water. Your programming
will not produce the same results if factors affecting brewing change such as changing the coffee you use,
the age of the coffee, roast level, changes in grind, or changing the brew temperature or brewing pressure
occur.
Regardless of how you begin the brew cycle, when the brew cycle began, the 3-way valve’s solenoid was
energized and it closed the valve, sealing the brew chamber. When the brew cycle ends the pump will be
turned off and the 3-way valve’s solenoid is de-energized and the valve opens and relieves the pressure
remaining in the brewing path, and releases it into the drip tray. This allows you to immediately remove the
portafilter without worrying about the “portafilter sneeze”- that’s a spitting out of coffee or hot water from
confined pressure as can happen on lesser machines without a 3-way valve.
15
4.5. Start up: boiler pressure gauge
5. First use of machine
On the far left side of the panel is the steam Boiler Pressure Gauge (scale 0.5 to 2.5 bar). This displays the
pressure in the boiler which indirectly supplies you with the water temperature in the boiler. The higher
the pressure, the higher the temperature. While the machine is idling this gauge will move upwards when
the heating element is on, and will slowly move downwards when the heating element is off. Generally
speaking, a reading of about .9 to 1.1 should be expected. The gauge will fluctuate in a range of about
.15 in normal operation when the machine is idling (on, but not being used). Each division is .05 BAR (.73
psi). The Heating Element Activity Lamp to the left of the steam boiler pressure gauge indicates heating
element activity. When the Heating Element Activity Lamp is energized the lamp will be illuminated.
For this first use of the Vibiemme Domobar, once the pressure is above about 0.5 you should flush the
boiler to be sure that the machine is working properly. Place a suitable container (like a heat-resistant
glass measuring cup or stainless steel steaming pitcher) under the hot water spout and carefully open
the hot water valve. Water should pour out and the pump should start. Pump out about 6 ounces and
then close the hot water valve. Repeat this two or three times over the next five or ten minutes, and then
check the reservoir level.
WARNING: The water dispensed as described above is hot enough to cause serious burns. Use
caution whenever dispensing or disposing water.
4.6. Start up: brew pressure gauge
The Brew Gauge on the right side of the display panel (scale 0 to 16 bar) displays the pressure in the
brewing path during an espresso pull. This gives a general indication as to what is happening during the
brewing cycle. The only time when the gauge will display any useful information is when the brewing
process is underway. At all other times, even when the pump is refilling the boiler, this gauge is not
displaying any useful information and should be ignored. About 9 BAR is a good place to be brewing as
you get started. Each division is .5 BAR.
To the left of the brew pressure gauge is the Low Water Indicator Lamp. If this is illuminated it means
that the water reservoir needs to be refilled and the machine will not operate until this task has been
completed. If the lamp is off, it indicates that the reservoir has sufficient water to operate.
To the right of the brew pressure gauge is the power indicator. This lamp is illuminated when the machine
is plugged into an electrical outlet and the machine is switched to stage I. The indicator lamps make it
easy to judge the machine’s state at a glance.
16
After an additional five or ten minutes of warm-up time, test the steam function. Place a vessel under the
steam wand and slowly open the Steam Valve. Steam should come from the Steam Wand and the boiler
pressure should drop slightly. After a few seconds, close the Steam Valve. It is normal for some water to spurt
out of the Steam Wand when the Steam Valve is first opened after it has been closed for some time.
WARNING: Steam can easily cause deep and nasty burns. The metal Steam Wand gets very hot.
Always move the Steam Wand by holding the rubber sleeve and take great care whenever using
the steam function.
When using the Steam Wand, the pump may occasionally operate on its own. The steam comes off the
top of the main boiler where it is “stored” all the time, and the pump will only run when the water level
drops to a point determined by the depth of the water-level sensing wire.
Now it’s time to wait! We mentioned in the other manual that patience is a virtue when it comes to
making espresso and here is our first example. The boiler, that huge brass grouphead, the portafilter, and
all the related metal parts need to come up to temperature. As the boiler comes up to temperature, hot
water will circulate through the system, helping to speed things up, but plan on waiting about twenty or
thirty minutes before the machine is ready for use.
17
6. Pressurestat Adjustment (HX and 2B version)
7. Temperature Adjustment (only 2B version)
The pressurestat controls temperature (pressure) by sensing the pressure in the steam boiler. Accessing the
pressurestat adjustment is simple. Simply remove the Cup Warming Tray and beneath that you will see a
perforated panel with a black plug. Remove the plug and fit a screwdriver, then turn to adjust the boiler temperature:
Coffee boiler temperature can be adjust through the Diplay. Once the Power Switch is on position
“STEAM ON”, the Diplay show the word OFF
COUNTERCLOCKWISE LOWERS THE TEMPERATURE*
• Press the ON
Button until the display read the temperature value (factory pre-set)
• Press the Program
Button until the displayed value start blinking
• Now you can insert the desire coffee boiler temperature value through the Buttons
temperature) or
(increase temperature).
* for further information on how the increase (decrease) of the pressure effect the brew temperature, see the HX/2B
system guide chapter 3 – How it works –
ATTENTION: on the manual version the Programm button allow you to surf the menu and adjust
parameters already set by the manufacturer.
CLOCKWISE RAISES THE TEMPERATURE*
•
•
•
•
18
(decrease
Parameter P....................0,5
Parameter I....................1,6
Parameter K...................2.1
Offset.............................20
19
8. Hints, Tips, and Tricks
8.3. Minimizing Mineral Buildup
We have already reviewed in the general instructions some of the ways that you can control the way
the Vibiemme Domobar espresso machine operates. The best example is the cooling flush which allows
you equalize and control the brewing temperature throughout the brewing path as well as eliminate any
steam that may have built up during an extended idling period. There are other procedures that you can
use to gain further control over the way your Vibiemme operates.
Mineral buildup in the boiler can be minimized by using the proper quality water and by de-scaling as
mentioned in the general instructions. Another way to lessen this scale accumulation is to pump water
out of the boiler occasionally.
This is particularly important if you rarely use the hot-water function of the Vibiemme Domobar. To refresh
the water in the boiler, simply place a heat-resistant vessel under the hot water wand and open the valve.
Dispense about 6 ounces, and then allow the boiler to refill before proceeding. Repeat this two or three
times. Doing so every one or two weeks will help minimize scale build up.
8.1. Maximizing Steaming Power
You probably have noticed that the heating element cycles on an off while the machine is in operation and
even when it is idling. That can be seen by watching the Heating Element Activity Lamp on the control
panel. That cycling can be used to your advantage when steaming milk. For the greatest production of steam
throughout the steaming cycle, start steaming just before the heating element turns off. You can judge this by
watching the Heating Element Activity Lamp in conjunction with the boiler pressure gauge. The goal is to begin
steaming when the boiler is as hot as its range allows while the heating element is still energized. As you draw
off steam the pressure in the boiler (and thus the temperature) will drop slightly which keeps the heating element
energized. With a little practice you will be able to do this without hardly even thinking about it..
8.2. Minimizing Temperature Variations During the Pull
A similar procedure can be used for the brew cycle. The best time to begin pulling a shot is when
the heating element has just turned off. This gives a bit more temperature stability as well because it
eliminates the variable of the heating element coming on during the pull. If the heating element comes on
during a pull, you will hear the pump lose a bit of power because the heating element is drawing a large
percentage of the circuit’s available current. If the circuit that feeds electricity to your Vibiemme Domobar
is challenged by the demands of the machine, this procedure will help lessen that load.
20
21
9. Troubleshooting
9.1. The machine is not working
• Be sure it is plugged in and the circuit is working. Try another outlet if in doubt.
• Be sure the Power Switch is turn on position “COFFEE ON”.
9.4. I can pump water, but the water is always cold
• Be sure the Power Switch is turn on position “COFFEE ON”.
• Over Temperature Safety Thermostat tripped. This occurs if the pressurestat malfunctions or the water
level is not maintained in the boiler. In either case the boiler can overheat. To save the machine from
damage, there is an over-temperature thermostat that protects the machine much like a circuit breaker
or fuse protects the wiring in your home. And much in the same way as a circuit breaker, the overtemperature thermostat can be reset. If you suspect that the thermostat has been tripped it is important
to verify the cause before continuing: please contact your retailer’s service department.
9.2. No water can be pumped
• Check the Low Water Level Warning Light to see if the Water Reservoir needs to be refilled.
• Check the Water Reservoir to be sure that the tank is properly seated in the machine.
Lift it and set it back into place. You should be able to feel it compress the springs of its platform which
engage the safety switch.
• Be sure the Power Switch is turn on position “COFFEE ON”.
9.3. The Grouphead is not getting very warm
• The operating lever on the right side of the Grouphead must be in the fully-down position, pushed
back towards the face of the machine as far as it will go (light pressure is all that is necessary- no need
to force the lever). If it is not in this position, the water path for the thermosyphon is restricted and the
Grouphead will not reach the proper operating temperature.
• Be sure the Power Switch is turn on position “COFFEE ON”.
• Check the Low Water Level Warning Light to see if the reservoir needs to be refilled.
22
9.5. The Machine Stopped Suddenly in the Middle of a Pull
• Check the water level in the Water Reservoir.
9.6. The Coffee Tastes Bad
The list of causes is nearly endless. Volumes can be written on what can cause espresso to taste bad,
some of which is discussed in the general instructions.
Here are a few tips to help:
• Be sure that the coffee you are using is fresh.
• Try a different brand of coffee.
• Are you using a quality grinder and grind the beans fresh for each use?
• If you know someone who makes espresso, invite them over and let them try making espresso
with your equipment and coffee. Sometimes the smallest change in procedure can make a big
difference in taste.
23
Bitter coffee can come from:
• Water that is too hot
• Coffee that is over-roasted or stale
• Cheap, low-quality coffee
• Worn burrs or low-quality grinder that makes too much dust
• Brew pressure that is too high
• Not using enough coffee in the portafilter.
Sour tastes can come from:
• Brewing temperature that is too cold
• Coffee that is under roasted
• Brew pressure that is too low
• Bad or spoiled coffee
9.7 The Brew Pressure Gauge Acts Erratically
The Brew Pressure Gauge on the front panel should only be used as a general indicator as to what is
happening during the brewing cycle. The only time when the gauge will display any useful information is
when there is a properly prepared portafilter, filled with properly ground and tamped coffee, locked in the
Grouphead, and the brewing process is underway. At all other times, even when the pump is refilling
the boiler, this gauge is not displaying any useful information and should be ignored. Even when the pull
is underway the brew gauge will read a little higher than the actual brew pressure at the coffee. If all is
going well, the gauge should read about 9.5 to 10 BAR during most of the pull.
10. Cleaning and Maintenance
As with all fine tools, the Vibiemme Domobar espresso machines can give you years of trouble-free
service and better performance if properly maintained. Your Vibiemme Domobar espresso machines does
require a bit of care, but it is not at all difficult.
Although the following guidelines will give you some idea of how often the tasks should be performed,
there is no specific set of rules concerning the frequency of cleaning and maintenance. A machine that is
being used to make two or three drinks each day in a home environment will not need to be cleaned quite
as often as a machine used in an office or restaurant where it is called upon to make fifty drinks a day. If in
doubt, it is better to do cleaning and maintenance chores a little too often rather than not often enough.
10.1. After Each Pull
KNOCK PUCK After the pull the spent coffee puck in the Portafilter should be knocked out. The best
way is to use a knock box. These feature a cushioned bar with a soft surface that protects the Portafilter
from damage.
QUICK FLUSH As soon as you remove the Portafilter from the Grouphead after a pull, cycle the brew
function for about one second or so. This will help flush out any coffee on or behind the shower screen.
FLUSH PORTAFILTER If you are not immediately going to pull another shot, replace the Portafilter
and repeat the quick flush. Pushing a bit of clean water through the Portafilter will remove most of the
left-over coffee in the Portafilter. Remove and wipe it off after the flush. If the machine is going to be
left on, leave the Portafilter in place so that it can remain warm.
10.2. After each stratching milk
The steam wand must be wiped off immediately after every use with a damp towel or dish rag after
removing the wand from the milk. As soon as the wand is wiped, the steam valve should be briefly
opened and closed to create a blast of steam to force out the remaining milk that may be in the wand.
Allowing milk to sit on (or in) the wand will bake the milk onto the hot metal. This is not only unsanitary
but can also become very difficult to remove. If you do have baked on milk we do not recommend soaking
24
25
the wand in a pitcher. This can cause dirty water to be drawn into the wand, and under certain conditions,
possibly into the boiler.
WARNING: The Steam Wand can be very hot. Avoid touching the wand directly and use caution
when wiping the Steam Wand. The heat can cause the water on the rag to turn to steam which
can cause a burn.
10.3. After Each Session
GROUPHEAD The area where the Portafilter locks into place gets exposed to a lot of coffee and
must be kept clean. Coffee residue left here will not only degrade performance over time but can also
detrimentally affect the taste of the coffee. At the end of each session, use the Grouphead Brush
which was included with your Vibiemme Domobar espresso machine to clean the screen as well as to
give the area in which the grouphead gasket resides a good scrubbing.
PORTAFILTER At the end of each session, the Portafilter should be rinsed under hot, running water
and dried off before storage. While it should be left in place on the Grouphead during use, if the
machine is being turned off, the portafilter should be stored elsewhere so that the moisture can evaporate
from the grouphead. Otherwise it can stagnate in there.
DAILY BLIND FLUSH - At the end of each day (or when you are through using the machine for that day)
you should do a blind flush:
1 - Remove a filter basket from either of the portafilters and insert the Blind Filter Basket in its place.
The blind filter basket is the one that has no holes in it.
2 - Lock the portafilter into place just like you would to make espresso.
3 - Manually engage the brew function
4 - Watch the brew pressure gauge and when pressure builds to about 9 BAR, turn the brew function off.
5 - Repeat steps 3 and 4 two or three times.
6 - Loosen but do not remove the portafilter and turn on the brew switch again. Wiggle the handle to
loosen the portafilter a bit so that water can flush the area around the grouphead.
WARNING: Hot water will spill out and pour onto the drip tray. Use caution to avoid burns from
the splashing hot water.
26
10.4. Backflushing
This is the process of forcing some special cleaner back though the Grouphead. This will remove any
stray coffee left in the places that normal, day-to-day cleaning cannot reach. How often this should be
done depends on how much use the machine gets, the coffee you use, as well as the amount of coffee
you use for each pull. If you are making one or two beverages a day, then once every one or two weeks
is probably sufficient. If you are making around four to six doubles a day, then once per week is probably
a good idea. If the machine is being used all day (such as in an office or small restaurant) then backflush
every day.
Your Vibiemme Domobar was supplied with a blind filter to be used to backflush. This is the basket with
no holes in it. To use it, follow these simple instructions:
WARNING: The cleaning agent is quite strong. Follow all safety recommendations on the cleaner’s
packaging. Only use chemicals designated for back flushing. Other cleaners can cause problems
or even damage to your machine.
1 - Insert the blind filter basket into one of the Portafilters.
2 - Place a small amount of espresso machine cleaner into the basket (see manufacturer’s instructions
for specific amounts to be used).
3 - Lock the Portafilter into place just like you would to make espresso.
4 - Manually engage the brew function
5 - Watch the Brew pressure gauge and when pressure builds to about 9 BAR, turn the brew function off.
6 - Repeat steps 4 and 5 until you see the suds of the cleaning agent appear in the Drip Tray (removing
the drip tray cover during this process can help you see what is going on). Wait about two or three
minutes, then repeat steps 4 and 5 once again.
7 - After two or three cycles like this, loosen but do not remove the Portafilter and turn on the brew
switch again. Wiggle the handle and allow the cleaner to be flushed up into the Grouphead. The cleaner
will overflow the Portafilter and clean the area up inside the grouphead of coffee.
WARNING: Hot water and cleaning agent will spill out. Use caution to avoid burns or exposure to
the cleaner. Wear eye protection to prevent injury.
8 - When the suds coming through the 3-way valve appear to be clean and free from coffee residue, empty
and clean the drip tray and the Portafilter. Replace the Drip tray and run a bit more water through the
Grouphead so it is free from cleaner. Replace the portafilter and repeat steps 3 through 5 until the water
runs clean into the drip tray. Repeat step 7 to rinse any remaining cleaner from the grouphead.
27
9 - Remove the Blind filter basket, rinse the Portafilter assembly, and you are done. It is suggested
that the first pull after backflushing be discarded just in case a bit of cleaner is left that could taint the
coffee.
CAUTION: The cleaning products meant for backflushing must NEVER be used in the water reservoir.
Using this cleaning agent in any way other than described here can damage your machine and void your
warranty.
10.5. Cleaning the Portafilter and Filter Basket
Pop the filter basket out of the portafilter body. Using a fingernail is not recommended as these commercial
Portafilters have a very stiff retaining spring inside. Using the back edge of an old butter knife as a lever
between the portafilter body and basket edge works quite well.
Dissolve a bit of espresso machine cleaner in hot water in a glass container. The solution can also be
used to clean the portafilter body as well as the portafilter baskets and any other similar parts soiled with
coffee. These parts can be disassembled and soaked overnight if necessary to remove stubborn stains,
but soaking them for five to ten minutes is usually more than sufficient for properly maintained parts.
10.7. Grouphead Gasket Replacement
The thick, rubber gasket that seals the Portafilter in the Grouphead is subjected to a lot of heat and
pressure. Over time it will harden and the portafilter’s action will create a depression in the surface. If it
begins to leak, the first resolution is to give it a good cleaning as mentioned above. If that does not cure
the problem then replacement is the next step. Before attempting this, it is a good idea to have the spare
gasket on hand.
The most difficult thing about replacing the grouphead gasket is removing the old one, especially if it
has not been regularly replaced. Just how hard or old the existing gasket is will dictate the difficulty of
removing it. Gently pry it out using a wide, flat-bladed screwdriver or a paint can opener. Take care not
to damage the chrome surface of the grouphead. It is a very good idea to have a spare shower screen
on hand when attempting this job. The screen is held in place by the gasket, and if you have to go at the
gasket with vigor, the shower screen can be damaged. Having a spare on hand will limit downtime.
Once the gasket is out, remove the shower screen and give the area a good cleaning. Be sure that no old
gasket or coffee residue is left in the grouphead. If need be, use a brass-bristle brush to clean the area.
To install the new gasket, assemble the gasket over the shower screen and place them on a portafilter,
Maneuver the assembly into place and then simply lock the portafilter into place as you would when
making espresso. The cam-action of the portafilter locking into place will push the shower screen and
gasket into place.
10.6. Exterior Cleaning
How often this needs to be done depends on many factors, but for in-home use about once every six
months or when leaks occur that are not resolved by other solutions as mentioned above.
NEVER use any abrasive cleaners or cleaning pads on your Vibiemme Domobar as they will scratch the
surface. A quality glass cleaner sprayed on a rag will usually do a good job of cleaning the outer surfaces,
but do not spray these in the area of the Grouphead, and always wait for the machine to cool before
cleaning the exterior. If your machine has painted panels take care to use products that are compatible
with powder coating. No solvents should ever be used as these may permanently damage the powder
coating’s sheen.
10.6. Hot Water Wand and Steam Wand
28
The tip of the Hot Water Wand is removable and can be cleaned after removing it from the machine. It
simply unscrews, but do not use pliers or other similar tool that may mar the finish. A small strap wrench
is preferable if a tool is needed.
Here is an image of the parts disassembled so you can see how they go back together. Note the black
O-ring still on the wand. Be sure it is there when reassembling. All parts are shown here with the correct
side facing upwards, and in order of assembly, starting with the part on the right.
The Steam Wand can become clogged if a cleaning is missed after steaming milk. The tip can be
removed by unscrewing. Remove the tip and soak it in cleaner, overnight if necessary. Note the O-ring. It
fits in the slot of the tip. Be sure the O-ring is used when assembling.
29
10.7. Long Term Storage
Waste disposal
The boiler and heat exchanger contain water. Because of that, if your Vibiemme Domobar is not going to
be used for a while or is being placed into storage, some factors must be considered.
The first is temperature. If it can be avoided the machine should never be stored where it will be subjected
to freezing temperatures. If water in the machine is allowed to freeze, a lot of damage can be done as the
water expands when it turns to ice. Try to avoid damage by freezing.
Although there are steps that can be taken to remove some of the water in the boiler, heat exchanger,
brewhead, and all the pipes and hoses, it is very difficult to get all the water out. If you suspect that your
Vibiemme may be left where it could be subjected to freezing conditions, check with your local RV supply
store. They sell antifreeze chemicals designed to be used in drinking water systems. Be sure that the
additives are safe to use on brass, copper, plastic, and chrome parts. Follow the instructions precisely.
After treating with these chemicals, tape over the power plug and tape a note to the machine and the
power cord at the plug end warning of the addition of these chemicals, and add a warning to completely
flush the machine before use! Be sure to completely flush the system before energizing the heating
element when putting the machine back into service.
For the waste management of the used appliances in safety and in respect of the environment, you can
deliver it to the appropriate sites for the differentiated waste collection, managed by the Commune.
In case the appliance has got batteries, take them away before proceeding to the waste disposal.
Since batteries contain substances highly polluting, they also must be disposed in a differentiated
collection site.
WARNING: Neither damage from these sorts of chemicals nor damage from freezing are covered
by the warranty. Use of these chemicals and storage in freezing conditions is to be done at your
own risk.
When placing a machine back into service after storage, even if not stored in such extreme conditions as
mentioned above, you must flush out the machine with fresh water to remove any stale water that was
left in the boiler, the heat exchanger, and in the various pipes and hoses. To do so:
1 - First wash the Water Reservoir, then fill it with water.
2 - Turn the Power Switch to position I. After the initial cycle of the pump stops, turn the Power
Switch to position “STEAM ON” and wait for pressure to build in the boiler.
3 -When the boiler pressure is at or above .5 bar, open the Hot Water Valve and pump about 6 ounces
of water into an appropriate vessel. Repeat that four times, waiting between glasses for the pump to stop
which signifies that the boiler has been refilled.
4 - Now pull three or four double shots without using coffee, then do a clean water backflush.
5 - Check the reservoir water level (unless plumbed-in).
6 - Allow the machine to fully warm up and you are ready, once again, to make espresso.
30
31
,
www.lavibiemme.it
VIBIEMME S.p.A. - Via Gounod 25/27, Cinisello Balsamo,
20092 (Milano) . Italy