For your safety first be sure the plug is disconnected from
the mains!
Rear case removal:
- To remove the rear case, first remove the 4 screws.
- Open both doors, at the upper/lower right and left side the
screws can be found..
Picture 1.
- When the rear has been removed all parts can easy be
reached.
Replacing the Keg Connector Assembly:
- The Keg connector assembly is very accurate outlined with
assembly at production.
- This has been done to be sure all Kegs will fit easily without
leakage to the machine.
- To be sure to place the new Keg connector assembly on
the same spot, make the following precautions before
unscrewing the Keg connector assembly.
- With a sharp screwdriver,
scriber or marking tool you
have to make a mark on the
plastic, see picture for detail.
- When the mark has been
carried out, you can unscrew
the 4 posi screws and remove
the Keg connector assembly.
- When reassemble the new Keg connector assembly, first
connect the air pressure hose and then make sure that the
new part will be outlined next to the marking you just
made with the original part.
Picture 2.
Replacing the Display:
- When the display has to be replaced for some reason, the
complete Right door including display and flat cable has to
be replaced.
- Remove the rear case assy, see rear case removal for details.
- Disconnect the flat cable connector from the main PCB
that is coming from the right door.
- To re-assembly carry out steps backwards.
Replacing the Fan assy:
- When the Fan has to be
replaced, unscrew the 4 posi
screws and disconnect the
connector of the Fan.
- When re-assemble the fan
assy, be sure that the airflow
(see arrow on the Fan) is
appointing to the heatsink.
* Note when the Fan became defect also Peltier element has
to be replaced or fully checked on performance. Due to
overheating also the Peltier element will be damaged.
Replacing the Peltier element:
- When the Peltier element has to be replaced, first remove
the rear case assy and Fan assy.
- Unscrew the 2 screws located on the heat sink.
- The heat sink including Peltier element can now be
removed.
- With a small screwdriver the Peltier element can be removed
from the heat sink, some force maybe needed.
- Before placing the new Peltier element, provide heat sink
paste on both side of the Peltier element.
- Place the new Peltier element on the cooler plate on the
same position of the removed Peltier element.
NOTE! It is important to place the Peltier element with
the right side on the cooler plate.
- The cooler plate is the aluminium part fixed in the
appliance, where the KEG will be cooled on.
- The heat sink is the aluminium part where the fan is
assembled on.
- In other words, the cooling side of the Peltier has to point
to the cooler plate and the warm side has to point to the
heat sink.
- Details to check are:
• Soldered joints must be pointing
to the cooling plate.
(when Peltier is placed on the
cooler plate the soldered joints
are not visible, seen from the
backside)
• Colours of wires must be equal
positioned see, picture for detail.
- Be careful and make sure the Peltier element is well placed.
- Now the heat sink can be placed on the peltier element.
- Tighten the screws alternate, to prevent damaging the
Peltier element for mounting lop-sided.
- Maximum force that maybe applied to tighten the screws
are: 0.6 Nm.
Picture 3.
Picture 4.
2-12
Page 3
DISASSEMBLY- AND RE-ASSEMBLY ADVISE
Replacing pressure sensor PCB:
- To replace the pressure sensor PCB assy, situated on the
pump, unscrew the 2 screws completely.
- Disconnect the connector, gently turn the PCB assy left and
right and at the same time pull the unit up.
- Place the new PCB assy and check if the small rubber ring
on the sensor tube is on its place.
Replacing the pump unit:
- Start with disconnecting the air pressure hose and electrical
connections.
- Unscrew the 3 screws from the plastic bracket were the
pump unit is hanging on.
- To re-assembly carry out steps backwards.
NOTE! To prevent leakage at the connection side of the
hose, cut a small piece off the end of the hose.
HD3600/20
3-12
Page 4
REPAIR INSTRUCTIONS
Electrical circuit:
- When the appliance does not work, check the electrical circuit.
HD3600/20
Beer outlet
Process block diagram of the appliance
Shortcut to
enter Service
mode
10.5 V
Power supply
Mains
(120 V or 230 V)
J1
J4 J3
Interface board
(rear panel)
J8J7 J11 J6 J5
J2
10k
pull-down
Step through
Service mode
Pressure
Sensor
PCB
Air
pump
J12
J1
J9
Micro controller
PCB
(Front panel)
Display
Air inlet
Keg
NTC
Keg present
switch
Heatsink
plastic bag
Keg fill air
release
Compressed
air
Beer in
M
Fan
Peltier
Chillerplate
M
Picture 5.
Working principle of the appliance
- To understand the appliance better hereby a short description of the working principle.
- Beer, the Beer is stored in a plastic bag inside the Keg, see picture 5.
- The Beer only comes in contact with the tube connector and never with the appliance.
- When the tap unit and tube connector are connected on the Keg and the Keg is placed in the appliance, the Keg present switch
will be activated.
- Once the appliance is activated after approximately 10 seconds you will hear a pump running.
- The task of this pump is to fill the space between the plastic bag and the walls of the Keg with air and create an overpressure
situation (Overpressure ± 1500 mBar).
- Through the over pressure around the plastic bag (comparable like you squeeze into the plastic bag) the Beer will be pressurized
(sort of) as well.
- By pulling the tap handle the tube connector hose will become opened and the Beer will flow out of the plastic bag via the tube
connector in to the glass.
- After this cycle the pump will start running to go back into the overpressure situation like described before.
- When the Keg present switch has been actuated also the cooling process (Peltier element) will be started and display functions will
become visible.
- The temperature will be measured by a NTC located in the Keg present plunger and indicated on the display.
- The volume indication measurement is based on the principle of a pressure drop measurement, measured by a pressure sensor.
- When pouring Beer, the pressure in the KEG will decrease, the amount that the pressure will decrease in a period of time will be
calculated through the system.
- The result of this calculation will be indicated on the display.
- The volume indication steps are dived in 4 steps of 25 %.
4-12
Page 5
REPAIR INSTRUCTIONS
Service testroutines
- This appliance has been equipped with special service routines to be able to check several functions of the appliance.
- Below the necessary steps will be described to enter into the service mode.
- Please follow the instructions carefully to avoid damaging the electronic circuit of the appliance.
Putting the appliance into Service mode.
1. Disconnect the appliance from mains.
2. Remove the keg.
3. Shortcut connector J3. (see picture 5)
4. Connect a simple push button to connector J9.
5. Connect the appliance to mains.
Stepping through the Service mode.
- As the Service Mode is entered, the display will show the software version, Service Mode 0.
- Every time the push button is activated, the next Service Mode is entered, forcing another part of the appliance to become active.
The list below shows all the possible Service Modes.
- After mode 10, the routine jumps back to mode 1.
Mode TestStimulusResponseRemark
No testShows software version2 digits. E.g. 20 = version 2.0
0
Display test1. Display shows red 1
2. Display blanks
1
Pump motor1. Pump motor starts running.
2
Fan motor
high level
3
Fan motor
low level
4
Peltier low1. Peltier starts cooling.
5
Peltier medium1. Peltier starts cooling.
6
Peltier high1. Peltier starts cooling.
7
8
9
10
Pressure
measurement
Temperature
measurement
Keg Activation
switch
Connect dummy
pressure sensor
Connect dummy
NTC sensor
Operate the Keg
Activation switch
3. All segments on (red)
4. All segments on (green)
5. Repeat from 2.
2. Display shows red 2.
1. Fan starts running.
2. Display shows red 3.
1. Fan starts running.
2. Display shows red 4.
2. Display shows red 5.
2. Display shows red 6.
2. Display shows red 7.
1. Display shows full bar, graph if ok.
2. Display shows red 8.
1. Display shows full bar, graph if ok.
2. Display shows red 9.
1. Bar graphs off (not activated)
or on (activated).
2. Display shows red 10.
Segment test runs automatically
Pump runs; Voltage across pump:
~9 Vdc / ~2.7 Vrms
Fan runs on high level (100%)
Voltage across fan:
~10.5 Vdc / ~0 Vrms
Fan runs on low level (~75%)
Voltage across fan:
~8.9 Vdc / ~0.25 Vrms
Peltier runs on low level (~10%)
Voltage across Peltier:
~2.3 Vdc / ~3.0 Vrms
Current through Peltier: ~2.3 Arms
(Fan keeps running at high level)
Peltier runs on medium level (~50%)
Voltage across Peltier:
~6.0 Vdc / ~4.0 Vrms
Current through Peltier: ~4 Arms
(Fan keeps running at high level)
Peltier runs on high level (100%)
Voltage across Peltier:
~10.5 Vdc / ~0.0 Vrms
Current through Peltier:
>4.7 Arms (lower = defect Peltier
(Fan keeps running at high level)
Replace pressure sensor by dummy
sensor
Replace NTC sensor by dummy
sensor
HD3600/20
5-12
Page 6
k
REPAIR INSTRUCTIONS
HD3600/20
NTC DUMMY:
J2
NTC value 20 kΩ < Rdummy < 22 kΩ (= 4 °C ... 6 °C)
PRESSURE SENSOR DUMMY:
5k
4k7
19
Any other value:
1
J12
4k7
4k7
1k
4k7
Input voltage 9 mV < Vdummy < 10 mV (900 ... 1100 mbar)Any other value:
6-12
Page 7
REPAIR INSTRUCTIONS
Trouble shooting:
1. Appliances doesn’t work at all
Check if the KEG PRESENT switch is functioning OK or check the Voltage output (10 V ± 0.5 V) of the Power supply.
2. Display Error signals
If somehow the system detects a problem, in a few occasions the system is able to use the display for displaying the type of error
detected by the system.
HD3600/20
DISPLAY no tap unit
Static segment green
Background lights on
Bar graphs off
DISPLAY leakage
Static segment green or red.
Blinking background
Bar graphs off
DISPLAY no keg
Static segment red
Background lights on
Bar graphs off
Way of software detection:
When the system detects no pressure rise during running of
the pump (duration measurement 10 seconds), the software
will interpret that there is no tap unit on its place.
Checks:
• Is the pressure sensor function correctly?
(See chapter repair instructions, service test routines to
check with dummy)
• Is a huge air leakage noticeable in the system?
Way of software detection:
When the system detects a pressure fall which is greater
than normal occur when pouring Beer, the software will
interpret that there is a leakage in the system.
Measurement take approximately 300 seconds.
Checks:
• Is the pressure sensor function correctly?
(See chapter repair instructions, service test routines to
check with dummy)
• Is a huge air leakage noticeable in the system?
Way of software detection:
The KEG present/activation switch will give input to the
Interface board.
Checks:
• Is the micro switch function correctly?
(See chapter repair instructions, service test routines to
check the switch in combination with interface board)
3. Blinking display or pump is “to” often activated. (Air Leakage)
If the display is blinking or the complaint is that the pump is running very often (more than 4 times per hour without pouring
Beer), the cause could be that there is air leakage in the air pressure system.
Possible components to check are Keg, tube connector, tap unit, pump, hose or pressure sensor.
Checking the problem to determine if the leakage is located inside the appliance or outside.
Step 1: Remove the Keg and tap unit.
Step 2: Block the air Inlet coupling at the Keg side. See picture for location, be sure the hole is blocked.
Step 3: Actuate the KEG present switch (for example putting a Keg without tap unit in the appliance) after ± 10 seconds the pump will start running)
When the pump has stopped, wait ± 300 seconds after this time has passed, check if the display
reading is normal (not blinking) also the pump may not run in this period of 300 seconds.
When the system has detected a air leakage by itself, the backlight of the display starts blinking.
(see also point 2, Display error signals for details)
When the system is function correctly and there is absolutely no air leakage the pump runs two or three time per 24 Hours.
Possible root causes that have to be checked are, tube connector, Keg, tap unit and connections.
If the pump keeps pumping or the system is displaying a leakage error, other internal root causes to be checked are, leakage at
connections of hose and components, pressure sensor leaks or is electronically defect see chapter repair instructions, service test routines step 8 to check the electronic parts.
Leakage problems can be found by providing a little bit water and soap on the suspected places to see if the air bells are visible
when the pump is activated.
When internal no failures are found please check the external parts like KEG, tap unit and tube connector.
Picture 6.
7-12
Page 8
REPAIR INSTRUCTIONS
4. Cooling problems.
Several causes can influence the unit from cooling down.
Cool down process takes very long. (more than 18 hours KEG 23 °C -> 3° C)
- Check the usage conditions; the cooling principle of the appliance is based on a Peltier element. The Peltier element works by
withdrawn heat that results in the fact that the surface on the other side of the element will cool down. To be sure the Peltier
element is doing it’s job well it is very important that the airflow from the fan that transports the produced warmth out of the
appliance is free (± 10 cm) space around the appliance.
- Check if the ambient temperature did not exceed 27 °C.
- Check if the fan is turning well and there is no blockage caused by dust or other particles.
- Check if the Fan is correct placed (see chapter DISASSEMBLY- AND RE-ASSEMBLY ADVISE, replacing the Fan assy for
details).
Unit doesn’t cool down.
Probable root causes:
- Peltier element became defective.
(see chapter repair instructions, service test routines steps 5 - 7 to check the electronic parts)
- Temperature Sensor is filthy or defective were through the cooling control process is derangement.
(see chapter repair instructions, service test routines step 9 to check the electronic parts)
- Display temperature reading is not reliable. (To check the display reading, place a temperature sensor next to the location of
the KEG present plunger, after ± 5 minutes of stabilization check the temperature reading from the display with the external
temperature measurement device.
Because the temperature sensor is placed in the middle of the KEG, subtract a 4.2 °C from the external placed temperature
meter before judging the values.
After subtraction of 4.2 °C, deviation aloud +/− 1° C, below 3° C −1 °C / +2 °C)
Example:
External indication temperature meter 7.2 °C
Display reading PerfectDraft system 3 °C
Conclusion (7.2 reading ext. − 4.2 offset value) = 3 °C, appliance within spec.
5. Beer leakage.
If the consumer complains about Beer leakage, most probably items that have to be checked are Keg, tube connector and
tap unit.
If the Beer leakage is noticed at the spout side, please check the tube connector on presence of hair-line cracks or check if the
tube connector is good positioned.
Other possibility could be that the closing mechanism of the tap unit does not block the Beer tube accurate.
If the Beer leaks more at the Keg or tap unit position, please check the Keg, tube connector or tap unit on visual aspects.
6. Condensation water leakage.
When the consumer complains about Beer/water under the appliance most probably cause is that either the drip tray unit was
not good placed under/against the appliance or the drip tray was not emptied on time, which can cause overflow of a mix of Beer
and water.
Other possibility could be that the doors were not closed properly.
7. Temperature display reading cannot be trust.
If the Display reading is not trustful or values are displayed that are not in line with what maybe expected, the display reading has
to be checked.
For checking the temperature reading please see under Trouble shooting point 4 Cooling problems or to determine if the
temperature sensor or circuit board has become defect, please see chapter repair instructions, service test routines step 9 to check the electronic parts.
It is not possible to adjust the temperature measuring system of the appliance.
HD3600/20
8-12
Page 9
REPAIR INSTRUCTIONS & PARTS LIST
8. Beer volume indication.
The Beer volume indicator is a device to give the consumer an impression about the amount of Beer left in the KEG.
This indicator is not accurate only steps of 25 % are possible to display.
When the consumer is complaining about the fact that the display indicates a empty KEG but there is still Beer left in the KEG
this is actually not a failure in the appliance.
When less then 30 % of the volume is measured by the system the display will indicate 0 %.
Other complaints of the consumer could be that the display shows 100 % volume, but there is already Beer out of the KEG.
If for some reason the appliance has been switched off or a voltage dip has occurred in the mains network or the KEG has been removed and replaced again, the system will start with a 100 % volume indication.
After pouring one or two glasses of Beer, the volume indication will be recalculated and displayed.
If the volume indication is for some reason not thrust full, the cause could be that there is an air leakage in the system.
In that case most likely parts to check are Beer tube connector, KEG or Adaptor. See under Trouble shooting point 3 Blinking
display or pump is “to” often activated. (Air Leakage).
9. No foam on the Beer.
If the complaint is that there is “almost” or no foam on the Beer, the following have to be checked.
1) Temperature of the Beer must be below 9° C, check DFU for more tips.
2) Glasses have to be clean, check DFU for more tips!
3) Beer tube connector is not properly installed or is damaged, check DFU for more tips.
3) There must be no air leakage in the system.
(Trouble shooting point 3 Blinking display or pump is “to” often activated. (Air Leakage).