M&v s.r.l. Minima User manual

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INIMA OWNERS MANUAL

INTRODUCTION .................................................................................................................................................................... 3

MINIMA SUPPLIED ITEMS. ........................................................................................................................................................ 3

PRODUCT SAFETY NOTICE ....................................................................................................................................................... 3

Inspection and unpacking ................................................................................................................................................... 3

General Installation precautions ........................................................................................................................................ 3

Always ensure the portafilter is locked in correctly ............................................................................................................ 4

UNPACKING THE MINIMA ........................................................................................................................................................ 4

The Accessories ................................................................................................................................................................... 4

The internal tank ................................................................................................................................................................. 4

MINIMA SPECIFICATIONS ......................................................................................................................................................... 5

THE MAJOR CONTROLS OF THE MINIMA .................................................................................................................... 6

IMPORTANT NOTE ............................................................................................................................................................... 7

PREPARING THE MINIMA FOR OPERATION ................................................................................................................ 8

FILLING THE MINIMA FOR THE FIRST TIME ............................................................................................................................... 8

FLUSHING THE MINIMA BEFORE USING .................................................................................................................................... 9

GRINDERS ................................................................................................................................................................................ 9

COFFEE .................................................................................................................................................................................... 9

USING THE MINIMA ........................................................................................................................................................... 10

SETTING BREW AND SERVICE BOILER TEMPERATURE ............................................................................................................. 10

ESPRESSO & OTHER DRINKS .......................................................................................................................................... 11

Espresso ............................................................................................................................................................................ 11

Ristretto ............................................................................................................................................................................. 11

Lungo ................................................................................................................................................................................ 11

Americano ......................................................................................................................................................................... 11

Cappuccino ....................................................................................................................................................................... 12

Latte .................................................................................................................................................................................. 12

Flat white .......................................................................................................................................................................... 12

Macchiato ......................................................................................................................................................................... 12

Cortado ............................................................................................................................................................................. 12

STEAMING MILK .................................................................................................................................................................... 13

After steaming milk ........................................................................................................................................................... 13

DRAWING HOT WATER TO WARM CUPS, FOR AMERICANOS, TEA AND OTHER HOT DRINKS .................................................... 14

CLEANING AND MAINTENANCE .................................................................................................................................... 15

AFTER EVERY ESPRESSO OR GROUP OF ESPRESSOS ................................................................................................................. 15

DAILY (AT THE END OF EACH DAY) ........................................................................................................................................ 15

MONTHLY .............................................................................................................................................................................. 15

ANNUALLY ............................................................................................................................................................................ 15

E61 GASKET REPLACEMENT ................................................................................................................................................... 16

DESCALING ............................................................................................................................................................................ 16

Service Boiler Descaling ................................................................................................................................................... 16

Brew Boiler Descaling ...................................................................................................................................................... 17

OTHER PROBLEMS.................................................................................................................................................................. 18

Display Error Codes ......................................................................................................................................................... 18

PID VALUES EXPLAINED ....................................................................................................................................................... 20

APPENDIX 1 - ELECTRICAL SCHEMATIC (SIMPLIFIED) ............................................................................................................ 21

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Introduction

The Minima is a high quality prosumer grade dual boiler espresso machine that enables you to accurately control

brew temperature and easily make gourmet coffee drinks, such as espresso, cappuccino, latte, draw hot water or

Steam, all without any special preparation of the machine by having to switch it into different "modes" for

steaming and brewing.

An all stainless steel construction with a professional solenoid vented E61 group (originally developed by Faema

in 1961). Water circulates through the group head and the brew boiler, the metal of the group (8lbs of solid brass

with chrome plating) acts as a heat sink to keep the water temperature stable as you make your espresso. The

Minima is easy to use with simple controls.

Paolo Cortese (Designer, Director), Antonio Nurri (Director & Head of marketing

Minima Supplied Items.

 The Minima Espresso machine

 2 portafilter handles

 Double and single portafilter body

 Double basket, single basket and blind filter (rubber disk)

 Spare group gasket

 4 felt pads and 4 rubber pads

 Group cleaning brush

 Plastic Tamper

 Raised Cup stand (for espresso cups)

 Appropriate certifications, This manual and any additional

notes

Product Safety Notice

This manual is an integral and essential part of the product. Carefully read all warnings as they provide important

information required to install, use and maintain the Minima

Inspection and unpacking

After having removed the packaging, inspect the Minima for shipping damage. If you have any doubts, do not use

the Minima and contact a professionally qualified person or your dealer. Always keep all packaging including any

plastic bags. Keep packing materials out of reach of children and dispose of responsibly in accordance with your

countries recycling and disposal arrangements.

General Installation precautions

Before switching on the Minima make certain that the rating indicated by the label/specifications matches the

available power supply. The serial number and rating label is located at the rear of the machine. Installation

should be in line with the standards and laws within of the country where installed. We always recommend the

installing the Minima on a circuit protected by an RCD.

For electrical safety, this machine requires a ground or earth and a properly grounded electrical outlet with

adequate capacity for the current draw of the machine. If in any doubt, contact a certified electrician who can

check that the electrical outlet. We do not recommend the use of extension leads, adaptors or any other

equipment between the Minima and the mains supply socket (apart from a residual current device).

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Always ensure the portafilter is locked in correctly

Failure to do this can result in the portafilter coming undone, with the risk of scalding or breaking any cups below.

Please lock to the 6:30 position or further for safe operation

Unpacking the Minima

The Minima comes in a thick cardboard box with shaped packaging designed to protect it. Do not place the

Minima onto a surface subject to scratching or damage before installing the felt or rubber protectors. The felt

protectors allow the machine to easily slide on the counter top for filling. Use the rubber pads if you don’t need to

slide the machine.

Try not to damage the styrene packaging, as you may need it should you ever wish to transport/post the machine

without damage.

The Accessories

The machine comes with various accessories in padded plastic bags in the top section of packaging. Remove

these first before removing this section of packaging.

The internal tank

Access the internal tank for refilling

removing the steel cover as shown and

the internal plastic dust cover to refill the

tank with water. To remove the tank,

remove the both tubes and hold them to

one side then simply withdraw the tank

from the machine.

Remove the tank and wash in warm

soapy water before first use. Replace

both tubes in the tank. The longer of the

two tubes must reach all the way to the

bottom of the tank (this is the pump inlet),

make sure the small particulate filter is in

place. The shorter tube is the "expansion

valve" vent tube and need not reach the base of the tank or be under water. It is normal for water to exit this tube

during an espresso shot, when the machine is heating after a shot, or on initial warm up. Make sure both tubes

are in the tank and not kinked, do not place the inner lid on the tank, or replace the tank cover at this time.

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Minima Specifications

Dimensions: Height

Width,

x D

epth

370 x 270 x 440 mm

Weight: 21 kg approx

Voltage & Power (Max): 230 V-50Hz, 2480W (when used in simultaneous heating

mode), 1480W when used in brew boiler priority mode

(measured at UK Voltage).

Water Tank: 2.6 litres, removable with low water sensor. 2 litres usable

(approx)

Boilers: Twin insulated boilers, AISI 316L Stainless Steel (surgical

grade) 8mm end plates, 2mm thick walls. Incolloy 800 heating

elements.

Service boiler 2.3l (steam and hot water), 1200W

Brew boiler 800ml and 1000W

Pump Pressure:

15 bar max – regulated to 9 bar. (adjustable)

Gro

up Head:

Single E61 solenoid group (58mm)

Supplied Accessories  2 portafilter handles

 Double and single portafilter body

 Double basket, single basket and blind filter (rubber

disk)

 Spare group gasket

 4 felt pads and 4 rubber pads

 Group cleaning brush

 Plastic Tamper

 Raised Cup stand (for espresso cups)

 Appropriate certifications, This manual and any

additional notes



etachable

country specific

mains lead.

Construction: All stainless steel frame, body and boilers, removable drip tray,

cup warmer. Metal feet (height adjustable).

Water/Steam Hot water on demand. Steam on demand, wands on ball joint

mounts. Steam Boiler can be switched On/Off as required

Pressure Gauge

Group mounted (direct measure at coffee).

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The major controls of the Minima

PID Display

1. Shows Brew and service boiler

temperature

2. Shot timer (automatic)

3. Low water indicator (H2O)

4. 2 buttons to set brew temperatures

or access advanced settings

Power switch

5. Middle =

Minima is Off

6. Up = Brew

boiler only

7. Down = Brew

and Service

boilers on

Pressure of coffee

extraction/Group

pressu

re gauge

Cup warming tray

Steam

tap

Hot water

tap

Hot water

outlet

Portafilter –

loaded by lifting

into group head

with handle at 8

o’clock position

and moving anti

clockwise until

lugs engage (do

not apply too

much force, or jerk

handle

)

Vent for

release of

pressurised

water from

E61 group

Water tank hatch

Steam wand

E61 group

Brew switch

UP - to start making

espresso

DOWN - to finish and vent

group

Height

adjustable

feet

Drip tray

cover

(slides out)

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Important Note

If you don't read anything else, carefully read pages 8 and 9. It contains important information to prevent

damage to the Minima and correct setup and commissioning. There is a Video Playlist with various hints and tips.

It can be found at the following link and may have new Videos added from time to time. Some videos may be of

an earlier beta machine and have been left in where the process is identical.

https://tinyurl.com/Minima-User-Guide

The Minima is a machine that is simple to use even though it is a dual boiler machine. The single LED display

shows temperature, shot timer, low water visual indication and to access both temperature settings and advanced

settings. Throughout the guide, I will reference the "Brew Switch" and the "Power Switch".

The brew switch has two

positions, OFF (down) and Brew

(up). When you lift the switch,

the pump will run and water will

flow from the E61 group. When

you lower the switch, the pump

will stop and the vent solenoid

will activate and depressurise

the group.

The power switch has three

positions:

 Middle is off (the

machine is off and the

boilers do not heat).

 Up is for the coffee

brew boiler only and

with this setting the

machine will use around

70W per hour, at current

UK electricity prices

that's less than 15p per

day if the machine is on

from 9 am to Midnight.

 Down is for the coffee

and service boiler on together and the system will use more power. The service boiler needs to be on

for hot water and steam production. We recommend that you switch on the service boiler only when you

need it and not routinely run the machine with it switched on.

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Preparing the Minima for operation

You can think of this process as bringing your machine to life, be watchful during this time for anything abnormal

and ensure everything works correctly. Do not lock a portafilter into the group yet.

Filling the Minima for the first time

There are a few precautions when first commissioning any dual boiler and it is important to follow these

procedures to avoid unnecessary stress or damage to the machine, power on the Minima at step 3 and

not before.

1. Fill the water tank with clean water suitable for coffee machines (not high in lime scale forming

minerals).

2. Place a container under the E61 group (no portafilter should be loaded at this time)

3. Now move the Power Switch to the UP position (coffee brew boiler only). Wait until the software

revision has finished showing and the machine is fully booted up (about 5 seconds).

4. Press and hold the right hand display button for a few seconds until OFF shows in the display (this

ensures the heating elements are off).

5. Switch the Brew Switch to the brew position (up),

6. Once water flows from the E61 group for 5 seconds move the Brew Switch to the OFF position

(down). Water will stop flowing from the group

7. The pump may continue to run as it completes the fill of the service boiler.

8. Make sure the water tank water level is dropping and topped up as required.

9. Once the pump has stopped running, press the right hand display button once and Minima will now

start heating the brew boiler.

10. Move the Power Switch to the down position, wait for both service and brew boiler to heat.

11. Set the service boiler and steam boiler temperatures.

a. Press the left hand button once T1 (Coffee Boiler) will show in the display, quickly press the right

hand button and a temperature in C will show. Press the right (up) and left (down buttons) until

you get 93C.

b. Wait a moment and then T1 will show in the display, press the down button and T2 (Service

boiler) will display, quickly press the right hand button and a temperature in C will show. Press

the right (up) and left (down buttons) until you get 125C

c. Wait until T2 shows, continue waiting and Minima automatically exits temperature setting mode.

To go straight to the T2 setting, just press the left button twice.

ii.

If at any time you wish to exit temperature setting mode, simply wait for about 3 or 4

seconds

The above sequence helps protect the heating elements, brew boilers in ALL dual boiler machines do not have level sensors and it is why you

need to see water flow for 5 seconds from the E61 group. If the machine comes from a retailer, testing prior to shipping could mean, water

flows immediately from the group and the pump may only run for a few seconds longer to fill the service boiler. The above procedure

assumes a machine with empty boilers.

It is possible an A7 error will pop up once or twice during commissioning with empty boilers, if it does simply

switch the machine off (wait 10 seconds) and switch on again.

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Flushing the Minima before using

The manufacturing process and any subsequent testing will leave particles and tainted water within the machine.

It is extremely important to ensure you flush the machine before using. You may do this immediately after

successfully commissioning the machine. After the flushing process, you can choose to have the brew boiler or

brew and service boilers on.

1. Fill (or refill) the plastic water tank with Filtered water, or ensure boiler safe water is used.

2. Power switch down (both boilers)

3. Brew Switch up and draw brew water through E61 group for 40 sec, wait 1 minute and repeat. Do this

step 5 or 6 times, smell and taste water to ensure it is clean.

4. Place a container under steam wand and open tap to draw steam for 5-10 seconds

5. SWITCH MACHINE OFF

6. Place a container under the hot water outlet and open tap to drain as much water as you can (you will get

approx 1400 ml).

7. Refill water tank then switch machine back on. Power switch UP for Brew boiler heating only (just in case)

and allow service boiler to refill (approximately 2 minutes), but after 1-minute power switch to Middle for

60 seconds to rest pump, then return to UP position again. Ensure service boiler is filling and water level

in storage tank drops.

8. You may have to repeat steps 4 to 7 more than once if any taint or taste remains in the water.

9. Refill water tank, your ready to make coffee

NB: Discard all water drawn from the machine during this flushing process. If the machine is unused for an

extended period (you go on holiday for more than 2 weeks), it may be useful to repeat this process

Grinders

The temptation might be to use an inexpensive grinder unsuitable for the machine. To get the most benefit use a

grinder costing from approximately 30-50% of the machines value. To give a real world example, a grinder such

as the Eureka Mignon, Mazzer Mini or better grinder would be an excellent choice and better results

obtained with grinders that are more expensive.

The Minima is able to use coffee ground a little finer than other machines and less expensive grinders tend not to

grind as well at the finer settings.

Coffee

To do the Minima any justice at all, coffee must be fresh. You should know the roast date of the coffee and only

use quality coffee from good roasters. Ideally, the coffee should rest for at least 5 days from the roast date before

using, often even longer. Use the time recommended by your roaster for resting any specific coffee before use.

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Using the Minima

Before you turn the machine on using the on/off switch, ensure you have filled the water tank. Load the empty

portafilter in the group (just so it warms up). Leave the portafilter in the group when the machine is on, it needs to

stay hot. Check the steam and hot water valves are closed.

The LED display should light with NEU followed by the software code, before alternating between brew and

service boiler temperatures. You may hear the pump adding water to the service boiler if it required water. After a

few minutes the brew temperature displayed may have reached your preset value and the machine will seem up

to temperature, indicating the machine is ready to make espresso. It is not, the Minima needs

approximately 30 minutes to warm the E61 group sufficiently to make espresso.

The service Boiler takes approximately 5 min to heat from cold and when up to temperature is ready for hot

water or steam. Please note: The pressure in the service boiler allows hot water to flow and steam generation, the

pump plays no part in this. If you do not need to steam milk, I advise routinely running with the service

boiler off switching on the service boiler ONLY when you want to steam milk. This prolongs the life of your

machine and internal components. If you regularly need hot water, a kettle is a better (and more economical)

option. Running just the brew boiler only consumes around 70W of power, I run my machine from 9 am in the

morning to Midnight every day. At 2018 electricity prices, it costs less than 20p to run for 16 hours.

Because Minima uses a simple power switch rather than a soft switch. A mains timer or WiFi smart plug

device can control the machines On/Off times automatically. This is very convenient and saves having to

remember to switch the machine off at night and on in the morning. These devices are used at your own risk

and do not remove the need for the usual safety precautions. We recommend that someone should be at home

when these machines are on. You may read on the internet, that espresso machines may be left on 24 hours per

day, this is not advisable and they should be switched off when you go to bed, leave the house or make your final

coffee of the day.

Setting brew and service boiler temperature

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Espresso & Other Drinks

The methods for making espresso have changed in recent years and a better beverage results from using the

following methods and weights (rather than volumes). A double shot uses the double basket. Simply halve all the

amounts and use the single basket if making single shots. Although I refer to 18g in the recipes, some coffees

occupy more volume in the basket and you may find 17g is a better amount for the double basket supplied with

the Minima

It’s important to have a routine, You might give Minima a 4 or 5 second stabilisation flush before pulling a shot

after a long break between shots e.g. 10 minutes or more. I use this water to warm the cup. You can choose to do

this or not. It doesn’t matter as long as you are consistent.

Double Espresso is 18g of coffee in double basket and 36-40g total weight of Beverage extracted

(produced) in around 30-45 seconds

The 40g gives an average drink to aim at, but modern high-end espresso establishments are experimenting with

everything from 18g out to 50g out. I would personally call 18g out more towards the extreme Ristretto end of the

scale and 50+ grams in Lungo territory.

To produce this, you have to weigh both the coffee you are using and the output produced, therefore a

set of scales able to do this are required. Fortunately, they are readily available and there is plenty of

room under the Minima group to accommodate most coffee scales and cups. Should you not have scales

yet, you can temporarily adopt a volume-based measure and aim for around 45-55ml of espresso for every 18g of

coffee.

Espresso

A double espresso is approx 36-40g of extracted coffee, made by passing water at 90-96c, at a pressure

of around 140 psi, through 18gm ground coffee in a time of 30 seconds (the slow pressure ramp of the

Minima benefits a longer extraction. The drink should have a crema layer that is dark and possibly reddish

brown and may contain some darker flecks or striations (tiger striping/flecking). It should not be too bitter or too

acidic (the signs of too high or too low a brew temperature). Or sometimes to short a shot. It should be extracted

directly into a very hot espresso cup, preferably with thick walls and drunk immediately whilst still hot.

Ristretto

A smaller espresso drink, with the grind adjusted slightly finer to, producing up to 50% less weight in the same

30+ sec extraction time. In practice, many bars will just cut the shot short which is incorrect. (Ristretto means

"restricted").

Lungo

A long espresso, which should have the grind adjusted (slightly coarser) resulting in 50 - 70% more weight within

the same 30+ sec extraction time. It should not be an over extracted espresso by using a longer extraction

time. A Café Crema is a variation of a lungo with more volume, 140ml of coffee in a standard cappuccino sized

cup, extracted in the usual 30sec.

Americano

A single or double shot of espresso pulled on top (or added to) of 5oz or so of hot water, making something

similar to a filter coffee. This can be served with or without hot/cold milk. A Cafe Crema, is a different way of

producing a longer drink, like the Americano, but by adjusting the grind (much coarser) in order to achieve a 4-5fl

oz drink in the same 30 sec extraction time. I actually add hot water to my espresso to make an Americano,

probably a sin, but it works OK for me. I think they call it something different, but it's the same thing really.

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Cappuccino

Equal thirds of espresso, steamed milk and foam. If you have successfully microfoamed milk (by 50% or more),

this milk is simply tipped into the espresso base of the cappuccino. The micro foam will then separate out giving a

1/3 foam, and 2/3 coffee+micro foam liquid mix. The resulting drink has a silkier texture than a traditional

cappuccino, using steamed milk and then foam on top. It is also the basis for all latte and cappuccino art (that of

getting hearts, fern leaves, apples etc. shapes forming in the foam). If you pour micro foamed milk into the

espresso base from one side of the cup and just before the end of the pour pull the stream back across the

surface of the milk, you might get an apple. Sprinkling chocolate/cinnamon on the top is optional and adding a

spoon of chocolate to the espresso and stirring in before adding the milk, makes a Mocha

Latte

Although this means “Milk” this drink is meant to be, espresso 3/4 steamed milk and 1/4 foam on top.

Alternatively, take your 20% stretched (increased in size). I always used to take my micro foamed milk and tip

straight in for the type of "Latte" I preferred, I also liked a much higher volume of espresso to milk, it moved it from

being a kid’s milk drink to a proper coffee drink for me.

Flat white

In recent years, something called the flat white surfaced. Definitions vary, but it is effectively micro foam only,

poured into espresso, the volume of espresso being quite high. A double shot into a normal cappuccino cup (150-

180ml) might be more normal for this type of drink. The milk is micro foamed to cream like consistency with no

visible foam. It is actually my preferred method for "my own" Lattes.

Macchiato

A shot of espresso "stained" with a drop of steamed milk on top (means "marked" in Italian). Or for me, a drop of

double cream.

Cortado

Another favourite of mine, equal quantities of espresso, mixed with steamed milk. It gives a very strong espresso,

but the milk changes the taste of the shot quite dramatically. Another option (favoured by me) is to add a little

double cream.

Every year a new drink is invented, the beauty of your own machine is that you can experiment and do them

exactly how you like them. I never liked Lattes and without knowing it I was always making a "flat white", long

before they were invented and there are a few different definitions of the flat white. The important thing is it does

not matter, use these drinks as a guide, even the rules for espresso do not always apply for every type of coffee,

some require a lower brew ratio than others. Do not be afraid to experiment and make coffee your way.

I always prefer full fat milk (whole milk), you will often see latte and flat white differences stated as flat whites

always contain whole milk, but you use the milk you like. It is also OK to use cream (or butter) in coffee; in fact, I

think this practice will become more common in the future, especially double cream or butter. Do not be afraid to

experiment, it is why you have a prosumer machine, to duplicate and then move beyond what you can get

in the coffee shop.

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Steaming Milk

You can steam milk, or milk substitutes. The milk substitutes vary in their success usually in direct proportion to

the amount and type of fat in them. You should experiment to find a product that performs well for you. I find full

fat milk works best and it should be cold from the fridge. The milk jug should be one made for the purpose (e.g.

steel with a spout) and not be overfilled (60%-70% full), use a larger jug for larger volumes of milk. Before

steaming milk Purge the wand (open steam valve for a few seconds to heat the wand and remove excess water

(do this into a container).

Pro Tip: Open the steam valve "just before" placing the steam tip in milk (not after). This prevents a drop in

pressure forcing cold milk back into the wand (purging makes the wand hot and can cause this as hot air

contracts on cooling).

It does require some practice to achieve that perfect “glossy micro foam”. Steaming with the Minima is fast, so be

careful not to steam too long. The steaming time for milk to use in a single Latte is only 20 seconds or so.

Steaming is in two phases. The % time in each phase is shown below.

The longer you remain in the stretching phase, the more foam you will produce (but less micro-foam), perhaps

ideal for Cappuccinos but not so good for flat whites. The ideal consistency for latte art and the majority of drinks

is that of pouring cream…with no visible bubbles.

After steaming milk

Rinse the milk jug with clean water, submerge the steam wand fully and draw steam. This softens milk deposits).

Then take a damp sponge with a little washing up liquid, hold around steam wand for 5 seconds twist and wipe a

few times and the wand will come clean. Wipe with a clean damp cloth. Do not use scouring pads, or leave the

milk deposits to harden on the wand for any length of time. Sometimes the holes in the tip can block reducing

steaming and many group head brushes have a small spike to clean out the holes.

A useful tip on keeping the holes and tip clean is in this Video: https://tinyurl.com/Minima-steam-wand

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Drawing hot water to warm cups, for Americanos, Tea and other hot drinks

Open the hot water tap by turning anticlockwise, when finished close the tap lightly by turning clockwise (close

just enough to stop the water from dripping as this will preserve the life of the seals). Do not submerge the water

outlet as there is some steam with the water and it may splash boiling water onto your hands.

There will be some steam, so be careful, as the area above the wand will get hot. If your machine has wooden

knobs and the water knob gets excessively wet, we advise you quickly dry it after drawing water.

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Cleaning and Maintenance

After every espresso or group of espressos

 Use a group head brush or similar tool to lightly brush the

shower screen and gasket area in the group head (as shown

by the arrows).

 Rinse the portafilter to remove old coffee.

 Use a Damp microfibre cloth to wipe away any bad splashes

Daily (at the end of each day)

The same as after every espresso, but with a thorough wipe around the group seal, using a clean j cloth or

sponge. Wash the drip tray with warm soapy water, as well as the grille. Water marks on the group head and face

of the machine should be cleaned with a damp microfibre cloth followed by a soft dry microfibre cloth (do not rub

too hard). Separate the portafilter and basket thoroughly clean both before replacing. A pure water backflush

should be performed once or twice, this is the same as a cleaning backflush, but no cleaner is used.

Every 2 days I personally recommend removing the shower screen, clean the back of it and the inside of the

group. The process is shown at 3m 47s of the video at https://tinyurl.com/ACS-Minima-Cleaning

Note: get a small circular bottle brush for cleaning the spouts and hole in the centre of the portafilter holder

Monthly

Perform a more thorough cleaning including a backflush with cleaner and a wipe down of the machine and E61

group with a non-abrasive food safe stainless steel cleaner (not a cream). I use method stainless steel cleaner (a

clear liquid). It’s important the machine is cold when cleaning the exterior and E61 group.

The Video below covers cleaning especially backflushing with special backflush detergent cleaners e.g. Puly Caff.

It also shows how to easily remove the E61 shower screen and gasket.

https://tinyurl.com/ACS-Minima-Cleaning

Annually

Minima will benefit from an annual inspection; this can be a quick visual and auditory inspection for leaks or

hissing sounds when both boilers are on. Should you discover any problems, consult your dealer for advice. The

Visual part of the inspection is easily done using a torch and by removal of the top cover (cup warmer) of the

machine It's held on by 5 hex head screws (3 at the top and 2 at the back). It is always advisable to consider

getting the machine professionally serviced every few years.

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INIMA OWNERS MANUAL

E61 gasket replacement

In the cleaning video you will see the black

gasket detached from the shower screen.

This requires replacing every 6-12 months

depending on usage (machine on time). Over

time, they harden and require more and more

force on the portafilter handle to seal. They

are inexpensive and easy to replace. It is a

standard size (diameter) for an E61 group,

but should be 8 mm thick, again one of the

standard sizes available. The gasket first

pushes onto the shower screen as shown by

the green arrow and then the entire assembly pushes into the E61 group. The red arrows show the correct

orientation of the black gasket, which should be with the angled (chamfered) edge uppermost.

Descaling

It is impossible to advise about the frequency of descaling as this is dependent on the water hardness (lime scale)

and usage of the machine. Even if you use bottled water of a low mineral content or filters/filter jugs, eventually

the machine will require descaling. The only system that completely removes the need for descaling is softening,

or Reverse Osmosis with remineralisation using non scaling ions. Descaling should be performed by a qualified

service agent, so we only give broad guidance for the procedure.

The Boilers are low corrosion AISI 316L stainless, so will not be damaged by descaling solution and the copper

pipes feeding the group have such thick walls, it also won’t be a problem.

Service Boiler Descaling

This is the easiest boiler to descale. Switch on the service boiler; bring the machine up to full steam pressure

(whatever you have set). Place a container under the water wand, switch the machines power off and in stages

open the water tap and empty the service boiler. When you can draw no more water, the service boiler will be

completely empty. You will get approximately 1400ml of water from the service boiler

Place a descaling solution in the cold water tank approx 50g - 100g citric acid (always add acid to water) to 1

litre of water, dissolve the citric acid in a little warm water before adding cold water to make up to the volume

required. Switch the Minima on with service boiler heating enabled. The service boiler should start refilling

(do not touch the coffee brew switch unless you intend to descale the brew boiler as well). Add more

descaling solution to the cold-water tank as necessary. Allow the service boiler to come up to full pressure

and then switch off, leave the machine for 3 hours. Remove the water tank wash it out and refill with clean

water and replace in the machine.

Switch the machine on, once up to to full steam pressure (whatever you have set). Place a container under the

water wand, switch the machines power off and in stages open the water tap and empty the service boiler. You

will get approximately 1400ml of descaling solution and you should see evidence of descaling action. Be careful

the solution will be hot and acidic, do not get any in your eyes (or wear safety goggles).

Switch the machine on again and it should start to refill with clean water from the tank. Repeat this

emptying and refilling process twice, or until no more taint of descaler remains.

Infor

mation Technology Solutions

INIMA OWNERS MANUAL

Brew Boiler Descaling

You can use two methods, whatever you decide, it is important to prevent the service boiler from refilling unless

you plan to descale that as well. So, don't use any water from the service boiler, make sure the service boiler is

off and cool if you only want to do the brew boiler.

1. Easy method - Put a strong descaling solution in the cold-water tank (top up with new descaler as necessary)

100g per litre of citric acid, as before dissolve in a little warm water (always add acid to water) before adding

cold to make up 1 litre. Run this solution into the brew boiler by operating the brew switch. 30 seconds on/30

seconds off. Do this about 6 or 8 times until the water coming from the group smells strongly of descaler. Do not

have the portafilter loaded for this and use a container to catch the solution coming from the group.

Leave the machine on for a couple of hours, clean the water tank and replace the descaler with fresh water.

Repeat the flushing of the group as before, but with fresh water until no taint of descaler remains. Expect

to have to flush through around 15 litres or more to achieve this.

2. Hard method (only for experts, so no detailed description) - Unplug machine and open top, remove

temperature sensor without damaging wiring, it uses PTFE tape on the threads (so comes off easily). Use large

syringe and tube to evacuate brew boiler of water. Use same syringe to fill brew boiler with descaling solution 50g

-80g per litre (it will take around 800ml). Replace temperature sensor, bring brew boiler up to temperature and

leave for 2 hours. Unplug machine, allow to cool remove temperature sensor and use syringe to remove all

descaler. Fill with clean water and remove, repeat once more. Refill with clean water, replace temperature sensor.

Taste water from group to ensure all descaler removed, otherwise flush a few times.

This is a light descale, it's better to descale more often than do a much deeper descale with specialist

chemicals. It is very important to use a damp microfibre cloth and wipe of all splashes of descaler from

the stainless steel surface of the machine and group to avoid damage. Regularly rinse the cloth out.

Infor

mation Technology Solutions

INIMA OWNERS MANUAL

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