Marco Ecoboiler WMT5 User manual

Ecoboiler WMT5
Ecoboiler WMPB5
Ecoboiler WMT3
Ecoboiler WMPB3
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]

Service Manual Ecoboiler wallmount 1000671 100676 061010 Page 2 of 18
CONTENTS:
PAGE
1. INTRODUCTION 3
2. SAFETY INSTRUCTIONS 3
3. BASIC INSTRUCTIONS 4
3.1. Installation Details 4
3.2. Operation 4
3.3. Calibration 5
3.4. Troubleshooting 5
3.5. Maintenance 5
3.6. Cleaning 6
3.7. Limescale 6
3.8. Cautions and Safety Tips 6
4. TECHNICAL DATA
4.1. General Description 6
4.2. External Arrangement 7
4.3. Internal Arrangement 7
4.4. Access to internal components 8
4.5. PCBs 9
4.5.1. PCB Layout 9
4.5.2. PCB Ecoboiler Control –1600345 10
4.5.3. PCB Ecoboiler Display 10L –1600349 11
4.6. Troubleshooting –Diagnostic guide 11
4.7. Tank Components 14
4.8. Descaling procedure 15
4.9. Wiring Diagram 1000671 Ecoboiler WM5 16
4.10. 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 Wallmount Range. 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.
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:
o2.4kW
oSuitable cabling and fusing for a 2.4-3 kW circuit.
oEnsure the machine is fully earthed.
Plumbing installation procedure:
Note: Marco recommend that this machine be positioned over 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 litres through.
Connect the hose to the inlet valve of the boiler (again 3/4" BSP). The orientantion of the
tail piece will vary depending on whether machine is plumbed at the rear or at the
underside.
oWhen the machine is plumbed from the rear , connect right-angled tailpiece to the
inlet valve of the boiler (again ¾” BSP)
oWhen the machine is plumbed from the underside , connect non-angled tailpiece to
the inlet valve of the boiler (again ¾” 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 and there is power to the appliance.
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.
NOTE:
Because the boiler is electronically controlled no priming is necessary.
The element cannot switch on until a safe level of water is reached.
Ready/Status
Indicator
Power
Button
Ecomode
Button

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3.3. CALIBRATION
The Ecoboiler control PCB (1600345) has the ability to have the desired set-point temperature at
whatever setting is required. During manufacture of the PCB it is set to the default temperature of
around 95°C.
If the temperature setting needs to be modified on-site please follow the steps below:
1. To Enter Calibration mode:
a. Turn the machine off at the mains power supply.
b. Then, whilst depressing the tactile switch on the PCB, turn the mains power back on.
c. All available LED’s on the front panel will now blink continuously.
d. The machine is now in Calibration mode.
2. In Calibration Mode the machine will heat continuously until the tactile switch on the PCB is
pressed for a second time (NB: The tactile switch should be pressed for at least 1 second)
3. Using a thermometer to measure the temperature at the thermistor pocket, the machine
should be allowed to reach the desired set-temperature. (NB: It may be necessary to let the
unit cool down if the desired set point is lower than the units current temperature)
4. Following a correct calibration procedure the tank temperature should be maintained within
3°C of the desired set-point temperature.
In the event of an incorrect calibration process the steps below should be followed:
5. If the tactile switch is pressed too early and the temperature is set lower than desired, the
tester should simply repeat calibration.
6. If the tactile switch is pressed too late and the set temperature is too high, the tester will
need to wait for the temperature in the tank to cool, or add cool water, and then repeat
calibration.
3.4. 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.
3.5. 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.

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3.6. 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.
3.7. 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.
3.8. CAUTIONS AND SAFETY TIPS:
This appliance must be earthed.
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.
4. Technical Data:
4.1. GENERAL DESCRIPTION:
ECO Boiler WMT3, WMPB3, WMT5, WMPB5
WMT3
WMPB3
WMT5
WMPB5
Dimensions
Height (mm)
Width (mm)
Depth (mm)
447
325
222
447
325
222
447
325
222
447
325
222
Performance
Immediate Draw-Off (litres)
Max. Hourly Output
(litres/hour)
5.6ltr
24ltr
5.6ltr
24ltr
5.6ltr
24ltr
5.6ltr
24ltr
Electrical
Connection
2.4kW, 230V.
Plumbing
Fittings
Pressure
0.75” BSP
Food grade inlet hose supplied
5-50 psi (35-345 kPa)

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4.2. EXTERNAL ARRANGEMENT:
4.3. INTERNAL ARRANGEMENT:
Side Panel
Tap/
Push Button
Fixed centre
panel
Top tank access Lid
High Level Probe Assembly (2300463)
Low Level Probe
Assembly (2300463)
PCB Ecoboiler
Control (1600345)
ELEMENT 2.4kW
230V 1500950
Valve inlet
Solenoid (1502190)
Overflow
TuberHose
Mid Level Probe Assembly (2300463)
Thermal Switch
130Deg (1502087)
Terminal Mains
Connector
1502011
Thermistor Pocket U Shape
2300765
PCB Bracket

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4.4. ACCESS TO INTERNAL COMPONENTS:
s
ANY MAINTENANCE WORK ON ANY
ECOBOILER PRODUCT SHOULD ONLY BE
CONDUCTED BY A TRAINED SERVICE
ENGINEER.
Removal
1. Disconnect the machine from the
electrical supply.
2. Allow to cool sufficiently.
3. The removable Side Panels are fixed at
the top of the machine.
4. Unscrew with a Philips head screwdriver.
5. Remove the panels in an upward and
outward motion.
Reassembly
To re-attach the side panels, complete the
removal actions in steps 4 & 5 in reverse order.
Ensure that the panel screws are securely
fastened.
6. Reassembly
7.
8. To re-attach the side panels, complete
the removal actions in steps 4 & 5 in
reverse order. Ensure that the panel
screws are securely fastened.
9.

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Inlet Solenoid Access:
To access the inlet solenoid,
Unscrew the two cross-
recessed pan headed
screws holding the bracket
in place.
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
PCB Ecoboiler Control (1600345)
PCB Ecoboiler Display 10L (1600349)

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4.5.2. PCB Ecoboiler Control:
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
Switch the element
7. Heater Tab
8. On/Off 2-way Connector
Short circuited on this Ecoboiler machines –power switch controlled through the display
PCB
9. LED 5-way Connector
10.Earth Tab
11.Daughter PCB Connector (low voltage)
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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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 Calibration in Sec 3.3)
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
4.5.4. PCB Display Ecoboiler 10L (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
4.6. TROUBLESHOOTING –DIAGNOSTIC GUIDE:
2 FLASH CYCLES –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)
1
4
7
6
5
2
3

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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 CYCLES –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
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.

Service Manual Ecoboiler wallmount 1000671 100676 061010 Page 13 of 18
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:
1. The thermistor has failed.
Action required:
1. Replace the thermistor.
6 FLASH CYCLES –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.

Service Manual Ecoboiler wallmount 1000671 100676 061010 Page 14 of 18
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.
Outlet
Element (1500985)
Thermistor Pocket –ensure
that this is not touching the
element.
Probe Assembly (2300463) –low position
Probe Assembly (2300463)-
eco position
Probe Assembly (2300463)-
high position
Overflow Pipe
Water inlet

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4.8 Descaling Procedure
Descaling Procedure:
Isolate machine from power supply.
Isolate machine from water supply.
ALLOW TO COOL COMPLETELY!
Drain water from machine, drain hose is located at the base
of the machine, which is accessible by removing right side
panel.
Use ScaleKleen, Marco part No. 8000270 or similar. Follow
instructions carefully.
Remove lid located on the top of machine.
Remove insulation.
Using a nut spinner remove clean out plate.
Thoroughly clean and flush the machine before re-use.
Reassemble clean out door, adding a new “O-ring.
Follow installation and first time operation instructions.

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4.9. Wiring Diagrams

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4.13. Spare Parts List
Part
Number
Description
Model Variant
T3
T5
PB3
PB5
1400550
Circlip for Tap
X
X
1401170
Nut Chromed for Tap
X
X
1500950
ELEMENT 2.4kW 230V
X
X
X
X
1501217
Push Button Metal 230V
X
X
1502156
Valve Dispense Solenoid Muller
X
X
1502190
Valve Inlet Solenoid
X
X
X
X
1600345
PCB Ecoboiler Control Rev 2.0
X
X
X
X
1600349
PCB Ecoboiler Display 10L Rev 1.0
X
X
1600691
Thermistor Assembly
X
X
X
X
2100279
Tap Hot Water
X
X
2301463
Level Probe Assembly
X
X
X
X
8000240
Urn Cleanser (800g Tub)
X
X
X
X
8800121
Descale Box –6 Packs
X
X
X
X
1500470
O RING CLEANOUT DOOR
X
X
X
X
1501217
Push Button Metal 230V
X
X
Part
Number
Description
Model Variant
T3
T5
PB3
PB5
ECOW-026F
Exterior Lid
x
x
x
x
ECOW-015F
Base cover plate
x
x
x
x
ECOW-006F
WM Clean out door
x
x
x
x
ECOW-020F
Left Wing
x
x
x
x
ECOW-021F
Right Wing
x
x
x
x
ECOW-012F
Center Panel
x
x
x
x
ECOW-019F
THERMAL SWITCH BRACKET
x
x
x
x
MARCO is an
ISO9001:2000
Registered Company.