Marco Ecoboiler T20 User manual

Ecoboiler T20 & T30
SERVICE MANUAL
Marco Beverage Systems Ltd.
63d Heather Road,
Sandyford Industrial Estate,
Dublin 18,
Republic of Ireland
Ireland Tel: [phone]
Ireland Fax: [phone]
UK Tel: [phone]
UK Fax: [phone]

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CONTENTS:
PAGE
1. INTRODUCTION 3
2. SAFETY INSTRUCTIONS 3
3. BASIC INSTRUCTIONS 4
3.1. Installation Details 4
3.2. Operation 4
3.3. Troubleshooting 5
3.4. Maintenance 6
3.5. Cleaning 6
3.6. Limescale 6
3.7. Cautions and Safety Tips 6
4. TECHNICAL DATA 7
4.1. General Description 7
4.2. External Arrangement 7
4.3. Access to internal components 8
4.4. Internal Arrangement 10
4.5. PCBs 10
4.5.1. PCB Layout 11
4.5.2. PCB Ecoboiler Control (1600345) 12
4.5.3. PCB Display 20/T30 Ecoboiler (1600349) 12
4.6. Troubleshooting –Diagnostic guide 13
4.7. Tank Components 15
4.8. Descaling procedure 15
4.9. Wiring Diagram 1000660 Ecoboiler T20-3 16
4.10. Wiring Diagram 1000661 Ecoboiler T20-6 and T30 17
4.11. Spare Parts List 18

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1. INTRODUCTION:
The information provided in this manual is intended to assist in the installation and maintenance of
the Marco Ecoboiler Water boiler. Please read the instructions carefully to prevent accidents and
ensure an efficient installation.
This manual is not a substitute for any safety instructions or technical data affixed to the machine or
its packaging. All information in this manual is current at the time of publication and is subject to
change without notice.
Only technicians or service providers authorised by Marco should carry out installation and
maintenance of these machines.
Marco accepts no responsibility for any damage or injury caused by incorrect or unreasonable
installation and operation.
2. SAFETY INSTRUCTIONS:
Read all instructions.
To protect against electric shock do not immerse mains cord in water or other liquid.
To prevent chafing of the cable, do not let the mains cord hang over the edge of a table or
counter ; or touch hot surfaces.
Do not operate any appliance with a damaged cord, plugs, or after the appliance malfunctions
or has been damaged in any manner.
Switch off at the mains (unplug or disconnect from outlet) and turn off the water supply when
not in use and before cleaning. Allow to cool before removing components.
The use of spares and accessories not recommended by Marco may cause damage and/or
injuries.
Do not use outdoors. Do not place on or near a hot gas or electric burner.
Do not use the appliance for anything other than its intended use.
Save these instructions.

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3.BASIC INSTRUCTIONS:
3.1. INSTALLATION DETAILS:
Electrical installation:
EcoBoiler T20-3 (2.8kW) - A moulded 13A plug is factory fitted. A suitable 13A outlet is all that
is required.
EcoBoiler T20-6/T30 (5.6kW) –Needs to be hard-wired to a dedicated 30amp spur.
Plumbing installation procedure:
Note: Marco recommend that this machine be positioned on a counter with a drainage facility.
Marco cannot be held responsible for any flood damages.
Mains water pressure required (limits): 5-50psi (35-345kPa)
Fit a stop Valve on a cold water line and attach a 3/4" BSP male fitting,
(e.g. 3/4" x 1/2" 311 or washing machine type stop valve).
Connect straight tailpiece of the inlet hose to the stop valve fitting. Make sure that the pre-
attached sealing washer is fitted.
Turn on the water to flush any impurities, dust etc from the inlet hose and water pipe. Allow
several gallons through.
Connect right-angled tailpiece of the hose to the inlet valve of the boiler (again 3/4" BSP).
Make sure the sealing washer is fitted here also.
Turn on water and check for leaks.
3.2. OPERATION:
Check that all installation procedures have been carried out.
Ensure water valve is on.
Plug boiler into 13A socket and press power button on the front of the machine marked
‘Power’. Refer to Figure 1.
The “power on” light will glow green and the machine will fill to a safe level, above the
elements, before heating.
The “Ready/Status” light will cycle two red flashes while the machine is filling to the safe level.
After this amount of water has heated to about 96ºC the boiler will draw more water in until the
temperature drops by 1 or 2 degrees. The boiler will then heat again. This heat fill cycle
continues until the boiler is full.
Whilst the machine is above the safe level and filling, the “Ready/Status” light will remain
blank.
The “Ready/Status” light will glow green when the machine is both full and up to normal
operating temperature.
The boiler is now ready for use.

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Figure 1: Machine User Interface
NOTE:
Because the boiler is electronically controlled no priming is necessary.
The element cannot switch on until a safe level of water is reached.
3.3. TROUBLESHOOTING
The Ready/Status light signals various errors or problems.
A cycle of red flashes indicates an error. The number of flashes in a cycle corresponds to the
symptom in the table below:
Status/Diagnostic light guide:
No of
flashes
Symptom
Action required
2
Water level below elements. Normal
when machine first fills.
Check water pressure , if this is OK then call
service agent.
3
Temperature sensor failure (o/c)
Call service agent
4
Water not heating
Call service agent
5
Temperature sensor failure (s/c)
Call service agent
6
Machine not filling
Check water pressure. If OK –switch machine off
and on again. If problem reoccurs - call service
agent.
Note: Some of the error sequences will be displayed if there is low water
pressure. Please check that there is water pressure and that the water stop-
valve is open before calling your service agent.
For a more detailed description of error indicators and corrective actions see
section 4.7 of this manual.
Power
Button
Ready/Status
Indicator
Ecomode
Button

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3.4. MAINTENANCE:
Marco machines have been designed to give many years of trouble free service. Marco Beverage
Systems manufacture and test to ISO9002:2000 standard. The only regular maintenance required is
occasional de-scaling.
Descaling Procedure:
Isolate machine from power supply.
Isolate machine from water supply.
ALLOW TO COOL COMPLETELY!
Drain water from machine.
Remove all lids.
Remove as much scale as possible by hand, paying particular attention to level probes (White
plastic with steel tab). Be very careful not to damage any attachments.
Use ScaleKleen, Marco part No. 8000270 or similar. Follow instructions carefully.
Thoroughly clean and flush the machine before re-use.
Follow installation and first time operation instructions
3.5. CLEANING:
The exterior of these machines may be cleaned with a damp cloth and a light detergent. Do not use
abrasive cloths or creams, as this will spoil the finish of the machine. Do not use a water jet or spray.
Beware of accidentally operating the draw off tap or push button when cleaning the front of the
machine.
3.6. LIMESCALE:
In common with all water boiler manufacturers, service calls resulting from limescale are not covered
by warranty. Fitting a scale reducer is recommended, especially in hard water areas. This can
reduce the build-up of scale but may not stop it altogether. The frequency that descaling is required
depends on the local water supply; hard water areas need more attention. A scale reducer can
reduce the build up of scaling, but may not stop it altogether. Descaling of the machine should ideally
be carried out by qualified service personnel.
3.7. CAUTIONS AND SAFETY TIPS:
This appliance must be earthed. If the moulded plug supplied is not used then ensure that the
green/yellow cable is connected to a suitable earth.
Risk of flooding. The hose supplied with this unit is non-toxic food quality tested to 190psi.
However, a hose is not a permanent connection. It is, therefore, advisable to switch off boiler
and close the stopcock valve when boiler is not in use, e.g. overnight, weekends etc.
Risk of scalding. Beware of accidentally operating the water draw-off tap especially when
cleaning the front of the boiler.
The utmost care has been taken in the manufacture and testing of this unit. Failure to install,
maintain and / or operate this boiler according to the manufacturer’s instructions may result in
conditions that can cause injury or damage to property. If in any doubt about the serviceability
of the boiler always contact the manufacturer or your own supplier for advice.

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4.Technical Data:
4.1. GENERAL DESCRIPTION:
ECO Boiler T20-3, T20-6, T30.
T20-3
T20-6
T30
Dimensions
Height (mm)
Width (mm)
Depth –counter footprint (mm)
Depth –to front of Tap (mm)
Depth incl. Drip Tray (mm)
690
240
395
518
568
690
240
395
518
568
690
300
395
518
568
Performance
Immediate Draw-Off (litres)
Max. Hourly Output (litres/hour)
20
28
20
56
30
56
Electrical
Connection
2.8kW, 230V, c/w 1.5m flex and moulded plug
- fused (BS1363).
5.6kW Hard-wired Switched Spur
Plumbing
Fittings
Pressure
3/4” BSP
Food grade inlet hose supplied
5-50 psi (35-345 kPa)
4.2. EXTERNAL ARRANGEMENT:
Surround
Panel
Tap
Front Panel
Outer Lid
Drip Tray

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4.3. ACCESS TO INTERNAL COMPONENTS:
To access the tank:
To access the internal components:
Disconnect the machine from the electrical supply.
Allow to cool sufficiently.
The metal Front Fascia Top and Bottom panels are fixed to the surround with ball studs that
lock into spring clips mounted in the surround panel –refer to picture above.
To separate the ball studs from the spring clips insert a flat headed screwdriver at the locations
indicated on the picture and lever apart the front panels from the surround.
To remove the Front Fascia Top panel, after separating the ball stud from the spring clip,
rotate the top edge of the panel forward and pull the panel in an upwards motion.
Place the panel to the side of the machine
To remove the Front Fascia Bottom, after separating the ball stud from the spring clip, rotate
the bottom edge of panel forwards and pull in a downward motion. This panel is now free to be
placed out of the way.
Allow to cool. Remove the
outer lid.
Ensure that the tank is cool,
before removing inner lid. To
remove inner lid, undo 4
butterfly nuts
The tank is now accessible
for cleaning.
Ball Stud
Spring
Clip

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This allows access to most of the internal components and the machine does not need to be
drained for most maintenance or service operations.
If further access is required, the plastic Front Fascia Middle panel should be removed by
unscrewing the four cross recessed pan headed screws.
On Tap versions, the Tap assembly will need to be removed before the plastic Front Fascia
Middle can be removed.
The Tank can be drained by removing the plug from the end of the drain hose, and draining
into an external drain or a large container.
Inlet Solenoid Access:
To access the inlet solenoid, the PCB and PCB bracket need to be removed.
Unscrew the two cross-recessed pan headed screws holding the bracket in place.

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4.4. INTERNAL ARRANGEMENT:
4.5. PCBs:
4.5.1. PCB Layout:
Internal PCB Layout:
PCB Ecoboiler Control (1600345):
Controls the heater switching
Controls the water inlet switching
Controls tank temperature/temperature adjustment
PCB Ecoboiler Display 10L (1600349) consists of:
Power On/Off button
Power On LED
Status/Ready LED
ECO Mode On/Off Button
ECO Mode On LED

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4.5.2. PCB Ecoboiler Control (1600345):
COMPONENTS OF PCB ECOBOILER CONTROLLER 2008:
1. Dispense Solenoid Tab
2. Inlet Solenoid Tab
3. Neutral Tabs
4. Transformer
5. Mains Live In Tab
6. Relays - Heater
7. Heater Tab
8. On/Off 2-way Connector
Shorted with Jumper on Ecoboiler machines –power switch controlled through the
display PCB
9. LED 5-way Connector
10. Earth Tab
11. Daughter PCB Connector (low voltage)
Connects to Daughter PCBs –allows switching of more than one element
12. External Connector
13. Thermistor Connector
14. Dip Switch –3 way
Allows selection of software for specific machine
15. Tactile Switch
For use during calibration procedure (refer to Operation in Sec 3.2)
16. Water Level –5-way connector (low voltage)
Connects to Low level and High level probes. Also connects push button on PB
variants.
17. Button Connector –4-way
18. Data I/O Connector –4-way
19. Relays –Inlet Solenoid
1
2
3
4
5
7
8
9
10
6
6
11
12
13
16
17
14
18
15
19
19

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4.5.3. PCB Display T20/T30Ecoboiler (1600349)
1. Power On LED’s
shows that machine is switched on
2. Power On/Off switch
3. Status LED’s
displays error signals via a flashing Red LED
4. Eco Mode On LED’s
5. Eco Mode On/Of Switch
6. 5 way connector –to PCB Ecoboiler LED connector
7. 4 way connector –to PCB Ecoboiler BUTTONS connector
5
6
2
1
7
4
3

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4.6. TROUBLESHOOTING –DIAGNOSTIC GUIDE:
2 FLASH CYCLE –BELOW LOW LEVEL
Display pattern:
2 flashes then a short pause - repeated.
Electronic check and action:
This indicates that the low level circuit is open i.e. the probe is not in contact with the
water.
The element is switched OFF at this stage and the inlet is left ON.
(Note that if this is a low probe wiring fault, the water will stop at the high level probe
regardless of the status of the low level).
This is a recoverable error i.e. the machine does not need to be reset when the problem
is solved. (e.g. if a closed mains water stop valve is the problem, opening the valve will
allow water into the machine and normal function will resume when the low level probe
is reached)
Probable causes:
1. The water level is below the low level probe, which is normal when the machine fills for the first
time. (Can be flashing for up to 2 min at start up)
2. The low level probe wire is disconnected, or there is another wiring fault
(E.g. a bad earth (return) connection between the PCB and the Tank)
Action required:
1. Check that the water pressure is OK and ensure that the stop valve is open.
2. Check that the inlet solenoid is working.
3. If the water level is above the level of the low probe, check the probe circuit wiring
3 FLASH CYCLE –THERMISTOR OPEN CIRCUIT
Display pattern:
3 flashes then a short pause - repeated.
Electronic check:
This indicates that the Thermistor is measuring such a large resistance that it assumes
the thermistor circuit is open.
The element and inlet valve are turned OFF when this error is detected
This is a recoverable error. When the correct range of resistance is measured, normal
operation resumes
Probable causes:
1. The thermistor probe is unplugged from the 4way connector on the PCB or the thermistor has
failed open circuit.
Action required:
1. Check that the thermistor is plugged in to the PCB correctly. If it is, replace the thermistor.
4 FLASH CYCLE –NOT HEATING
Display pattern:
4 flashes then a short pause - repeated.
Electronic check:
This checks that the temperature is increasing when the heater is on.
Measures the rate that the temperature increases in a specified time. This error is only
displayed after 20 mins of the heater being on continuously. When the error is detected,
the element and inlet valve are turned off.
This is a non recoverable error. The machine needs to be reset when this problem is
solved.
Probable causes:
1. The elements have failed
2. Wiring fault

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4.6. TROUBLESHOOTING –DIAGNOSTIC GUIDE cont:
Action required:
1. Check that the resistance on the elements. If there is a reasonable resistance (15-25Ω) on the
element it probably has not failed, so the wiring might be at fault.
5 FLASH CYCLE –THERMISTOR SHORT CIRCUIT
Display pattern:
5 flashes then a short pause - repeated.
Electronic check:
This indicates that the Thermistor is measuring zero resistance. It assumes the
thermistor has failed sort circuit.
The element and inlet valve are turned OFF when this error is detected
This is a recoverable error. When the correct range of resistance is measured, normal
operation resumes.
Probable causes:
2. The thermistor has failed.
Action required:
2. Replace the thermistor.
6 FLASH CYCLE –NOT FILLING
Display pattern:
6 flashes then a short pause - repeated.
Electronic check:
This checks that the water in the tank cools when the inlet solenoid valve is switched
on.
This is a non-recoverable error. This checks that the water in the tank is cooled by when
the inlet solenoid valve is opened. If the water pressure is within the specifications (5-
50psi), the inlet solenoid should not be on for more than a few seconds. If this water
temperature has not decreased by the required amount
(1 degree per minute), the inlet solenoid is switched off and the 6 flash cycle is
displayed.
Probable causes:
1. Mains water pressure problem or the mains water stop valve is closed.
2. Inlet solenoid valve failure.
Action required:
1. Check the mains water supply. (Note: Temporary loss of water pressure can occur in certain
sites –particularly when various machines are plumbed to the same mains water supply.) If
the water supply is ok, reset the machine (switch the machine Off and On again). This will
reset the error and if the water supply is ok, the machine will return to normal operation.
NOTE: If the water supply is the problem, ensure that this is rectified or this error will
re-occur.
2. If there is no problem with the mains water supply, check that the inlet solenoid valve is
working.

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4.7. Tank Components
The tank internals are detailed below. Care should be taken when cleaning inside the tank.
The level probes provide much of the control inputs into the PCB and are critical to the operation of
the machine. The wiring to these should be checked regularly and the probes themselves should be
cleaned whenever the machine is serviced.
There are 3 level probes on the T20 and T30 Ecoboiler versions.
The Ecoboiler T20/T30 tank is shown below –only the low level probe is visible in the picture.
4.8. Descaling Procedure
To descale the machine thoroughly:
Unplug the machine.
Disconnect from the water supply.
Drain as much water from the tank as possible.
Remove the lids and allow the machine to cool completely.
Drain all the water from the machine.
Attempt to remove as much scale as possible by hand.
Reconnect machine and start up once again.
Add a descale solution (follow instructions as given). Flush the machine thoroughly before use

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4.9. Wiring Diagram 1000662 Ecoboiler T20-3

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4.10. Wiring Diagrams 1000663 Ecoboiler T20-6 and T30

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4.13. Spare Parts List
Part
Number
Description
Model Variant
T20-3
T20-6
T30
1600345
PCB Ecoboiler Control Rev 4.0
X
X
X
1600349
PCB Ecoboiler Display 10L Rev 2.0
X
X
2100279
Tap Hot Water
X
X
X
1401170
Nut Chromed for Tap
X
X
X
1400550
Circlip for Tap
X
X
X
1502190
Valve Inlet Solenoid
X
X
X
1500985
Element 2.8kW 230V
X
X
X
1600691
Thermistor Assembly
X
X
X
2300463
Level Probe Assembly
X
X
X
2300192
Drip Tray Complete –Ecoboiler T20
X
X
2300274
Drip Tray Complete –Ecoboiler T30
X
2300384
Lid Inner Ecoboiler Complete
X
X
X
2300391
Lid Outer Ecoboiler T20
X
X
2300392
Lid Outer Ecoboiler T30
X
1900653
Label Facia –Ecoboiler T20/T30
X
X
X
1800306
Gasket Inner –Ecoboiler
X
X
X
8800121
Descale Box –6 Packs
X
X
X
8000240
Urn Cleanser (800g Tub)
X
X
X