HD3600/20/B
4-15
Electrical circuit:
- When the appliance does not work, check the electrical circuit.
REPAIR INSTRUCTIONS
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 7.
- 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 %.*
* Note that from WK532 onwards the volume indication steps have been adapted from
4 levels to 8 levels
.
(See page 14 for the explanation/description!)
J1
J8
J7
J11
J6
J5
J10
10.5 V
Power supply
Interface board
(rear panel)
Process block diagram of the appliance
Mains
(120 V or 230 V)
J4
J3
10k
pull-down
Shortcut to
enter Service
mode
Pressure
Sensor
PCB
Micro controller
PCB
(Front panel)
Step through
Service mode
Display
Keg present
switch
Keg
Air
pump
Air inlet
J2
M
J12
J9
NTC
Heatsink
Fan
Peltier
Chillerplate
Beer in
plastic bag
Beer outlet
Compressed
air
Keg fill air
release
M
Picture 7.
