Chapter 3 Functional descriptions
46 SMSO-2-02.03- 15.07.03
Solenoid valves (3/2 way)
When not powered up, connection 1 is connected to connec-
tion 3; connection 2 is closed.
1 Housing
2 Valve seat
3 Valve body (core guiding tube)
4 Closing element (plunger)
5 Closing spring
6 Core packing
7 Coil
8 Pressure spring for core packing
Valve battery
Several individual valves (2/2 or 3/2 way) with a common
pressure connection can be accommodated on a valve battery
in a single housing!
Applications
2/2 way valves
Brewing valve (with bypass)
Bypass valve (see panel in section on “instant heater”)
Flush valve (see panel in section on “Instant heater”)
Steam valves feed valve for steam element
3/2 way valves
Brewing valve (without bypass and flush)
Connection identification codes / control input
When connecting / replacing solenoid valves make sure that
they are installed in the correct direction. The identification
codes (1,2 etc.) are given in the spare parts catalogue, in the
module drawings.
Also please note that the switch positions which can vary
according to the intended use (open when no current, closed
when no current, etc.)
The 2/2 way valves that are tested for temperature and pres-
sure especially for use in coffee machines carry a label like
the one shown below on the magnetic coil: W<99ZZ
(9=number; Z=letter)
Technical data
Valve type [ways] 2/2 3/2
Application Brewing Flushing Brewing
Nominal width [mm] 1.6 3 (1/8") 1.6
Max. operating pressu-
re [bar]
12 11 16
Nominal voltage DC
[V]
24 24 24
Current consumption
[A]
0.33 0.45 0.33
Coil rating [W] 8.0 11.0 14.0
Coil resistance [Ohm] 60 48 41
On-time 100 %
Protection class IP 65
Maintenance
Most frequent faults
Calcified: Valve does not close, insufficient flow
Faulty coil: Valve does not open/close at nominal voltage
Check
The switching on and off of all solenoid valves can be tested
by means of an output test. (For details see “programming
manual”; system test, output test and select the valve con-
cerned).
Service intervals
After 45,000 coffees or after 12 months’ operation, check for
calcium deposits and wear on the seal in the closing element,
and check the valve seats.
Feed valve for steam element
Rinse water valve (refrigerator)
3/2-way directional control valve for water cylinder
(refrigerator)
Steam valve battery
After every 45,000 coffee servings or after 12 months of op-
eration replace:
brewing valves (2/2, 3/2 way)
Flush valve
Hot water valve (tea)
Steam valves (individual valves)
Use repair kits (part no. 063247) for the valve battery.
After 36 months of operation, replace:
Steam valve battery, complete
Rinse water valve (refrigerator)
3/2-way directional control valve for water cylinder
(refrigerator)
Feed valve for steam element
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