Page 41
Reinstallation
»
Install replacement thermo switch
with a new sealing.
»
Properly connect the capillary tube
to the heater element. In case of
humidifiers with two or more heating
elements, the capillary tube is
attached to two heating elements.
»
Reassemble steam cylinder and
reinstall in humidifier housing as
described in the „Removing and
cleaning the steam cylinder“ section.
9.10 Releasing a thermo switch
that has triggered
To protect the steam humidifier against ther-
mal overload, the unit is equipped with one or
two thermo switches, depending on the unit
capacity. Mounting positions for the thermo
switches are on the cylinder cover. One of
the thermo switches (or „the“ one, in case of
only one thermo switch present) features a
capillary tube for thermal coupling to the
heater element. Additionally, the solid state
relay is protected with a bi-metal switch
attached to the heat sink to prevent damages
caused by inadequate ventilation through
e.g. covered vents.
From an electrical point of view, all of the
thermo switches are connected in series. In
case of one of the thermo switches triggering
due to a temperature too high, the main con-
tactor K1 drops, while the electronic control
enters fault state „120“, i. e. „thermo switch
fault“.
In case of one of the thermo switches trig-
gering repeatedly, the reason for this must be
identified prior to further unit usage.
Thermo switch(es) on steam cylinder
cover.
After the unit has cooled down, the thermo
switch that has triggered may be identified by
passage measurement, as long as it is a
thermo switch on a steam cylinder. Unblock-
ing the thermo switch is accomplished as fol-
lows:
Slightly push down the red button (s. above
section) protruding a few milimeters from its
holder. This will make the button return to its
original position and unblock the mechanism.
Relasing a thermo switch does not erase the
fault message in the control fault memory.
Thermo switch on solid state relay
The thermo switch attached to the solid state
relay is a bi-metal switch without an unblock-
ing feature. Instead, after cool-down, the
switch will be unblocked automatically.
Restarting the steam humidifier is only possi-
ble after cool-down.
9.11 Inspection of wiring
connections and heater ele-
ment wiring
Risk of functional disruption!
Risk of material damage!
Loose cable connections may result in
increased transition resistance and contact
area overheating.
»
Check all cabling terminals and
plugs for tight seating. Plugs must sit
on their respective contacts as far as
they will go.
»
Check heater element wiring for
damaged insulation
NOTICE
