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See “Drying Schedules” on pg 25
1. Dry Bulb Temperature (20°C to 72°C/68°F to
160°F): is the desired temperature for the kiln.
This set-point will manage the heater/vent
relay accordingly.
Screen Appearance: 5 Dry bulb xx°
2. Wet Bulb Temperature (20°C/ 68°F to Dry bulb
temperature): is the desired temperature for
the required air moisture. This set-point will
manage the compressor/ humidification relays
accordingly. The maximum settable temperature
is equal to the dry bulb temperature. Screen
Appearance: 6 Wet bulb xx°
3. Final Moisture (0% - 30%): is the desired
moisture percentage at the end of a cycle. The
kiln will automatically stop once this set point
is reached. This function can be disabled by
setting this parameter to 0.
Screen Appearance: 7 Final Moist xx
4. Wood Group (1 - 4 see table on page 22):
This determined the correction factor that
is applied to the moisture measure. This parameter
must be set according to the timber species being
dried. The table contains only most commonly
used species for ease of reference.
Screen Appearance: Configuration 8 Wood group x
Alarm Conditions/Messages
The controller can signal faults that may occur to
the temperature probes. When a fault is detected, an
error message is displayed instead of the
temperature value of the faulted probe.
When this occurs the controller will not work properly
and after about a minute all the output relays will
turn off (safety condition) signaling a buzzer alarm.
Error Messages:
Low: The temperature probe is either disconnected
or the temperature is below 1°C. The most likely
cause is a breakdown of the cable. Check carefully the
cable and, if damaged, replace it with a new one.
High: The temperature probe has either malfunctioned
or the temperature is higher than 119°C. The most
likely cause is a short along the cable. Check
carefully the cable and, if damaged, replace it with
a new one.
Err: Signaled when the wet bulb temperature is
equal to the dry bulb temperature. The most likely
cause is a malfunction with the temperature probes /
cables or the Wet bulb wick is dry. Check carefully the
cable and Wet bulb wick.
End of Cycle Press any Key: Signaled when the
desired moisture content has been reached. All
outputs are turned off and waiting for a new cycle.
Press any key to start a new cycle and/or change
parameters.
Timber Probes
KD250 controller measures the woods
moisture content by referring to its electrical
resistance. Therefore, it is necessary to deeply fix
timber probes into sample boards. The probes
are connected by cables to the panel jacks on the
controller, allowing them to provide accurate
information directly to the system.
It is important to make sure that the sample boards
you select represent the average moisture content
of the load being dried. To establish which boards
should be used you will need to test several boards
in the load with a portable moisture meter, and
average the moisture contents. Only select boards
that are closest to this average.
Probe Placement
Select probes that correspond to the thickness of
the timber. They need to be embed roughly 1/2 -
1/3 the way through the board. Wrong sized probes
will result in inaccurate information.
Probes need to be in the middle of the board, at
least 15”-20” (40-50 cm) from the ends and set
roughly 1¼” (30 mm) apart from each other, across
the grain. Do not place Probes along the grain.
This system can only accurately measure moisture
across the grain.
Once probes are set the sample boards should be
placed at different points inside the kiln dryer.
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