MKN HansDampf 10.1, Service Manual

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Service manual
Description
The unit is a volumetric proportion system for liquid substances. The unit produces a constant flow
rate , independent from the incoming water pressure . The flowrate only depends on the frequency
applied to the solenoids. The unit can have a water pressure switch* to detect water pressure. The
software of the machine determines the flow rate by adapting the frequency on the solenoids. A
calibration is not needed nor possible. This technology has been engineered and patents applied by
MKN.
Function
The unit consists of a cylinder with a double sided piston. The incoming water pressure drives the
piston to one or the other side, depending which valve is active. The piston drives a specific volume of
water to the outlet. Directly before the water enters the cooking chamber there is a orifice mounted
inside the tube and held with a clamp. Do not operate the unit without that orifice.
Due to the transparent cylinder the piston (seals) can be seen in motion.
The solenoids are supplied with 24 V DC.
The pressure switch* is set for a pressure of 1 bar (14.5 psi). Operation of the unit is guaranteed up to
6 bar (87 psi)entry pressure. Higher entry pressure requires a pressure reducing valve in front of the
unit.
Technical data
Normal Pressure Range: 1.5 – 6 bar (21.8 – 87 psi)
burst pressure: >20 bar (>290 psi)
Maximum flow rate: 28l/h
Volume of cylinder: 7ml
Electrical supply: 12-24V DC
Functioning Test
This setting starts a unit functioning test. In the service menu „water calibration”, a defined volume
flow of water is emitted. The authorised volume is shown in the display, the actual flow must be
determined by a measuring jug. To increase the water volume for a better measurement, this procedure
may be repeated several times.
The actual flow may deviate of the authorised flow by +/- 8% (e.g. for an authorised volume of 140ml,
the minimum and maximum volumes are 129ml and 150ml respectively.
The Summary information mask indicates the power supply of the unit by the signs B1 (energized)
And B0 (not energized).
Dual chamber units incorporate two units, which are parallel energized.
Tip:
During the cooking process, the volume flow cannot be determined because it frequently changes
during the process.
At delivery of the combisteamer the water system is empty. This may warrant more time until water
reaches the cooking chamber. During this time, multiple calibration cycles may be initiated.
*= Only at units with automatic cleaning system WaveClean
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