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Miele DA 226-2 Technical Information Page 3

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Model HU-226
Technical Information
TI.226-02
TEMP / HUMIDITY TRANSDUCER
Page 2 of 4
TYPICAL APPLICATIONS (wiring diagrams)
HU-226 humidity transducers are 4-20 mA output units powered with a
12-40 VDC supply.
The following describes the proper wiring of these humidity and temp sensors
with mA output:
HUMIDITY SENSOR:
1. Remove the terminal block by carefully pulling it off the circuit board.
2. Locate the [+] and [-] terminal markings on the board.
3. Attach the supply voltage to the [+] lead.
4. Connect the 4-20 mA output ([-] terminal) to the controller’s input terminal.
5. Ensure that the power supply common is attached to the common bus of
the controller.
6. Re-insert the terminal block to the circuit board and apply power to the unit.
7. Check for the appropriate output signal using a DVM set on DC milliamps
connected in series with the [-] terminal.
Model HU-226
Technical Information
TI.226-02
TEMP / HUMIDITY TRANSDUCER
Page 3 of 4
Input Signal
+
Common
+
+
Shield/Ground
Controller / Meter / Recorder
mA Output Transducer Only
12-40 VDC Power Supply
+
Controller / Meter / Recorder
mA Output Transducer Only
Figures 1 & 2 illustrate typical wiring diagrams for the HU-226, 4-20 mA,
two-wire humidity transducers.
Figure 1 - Wiring for mA Output Humidity Transducer with External DC
Power Supply
Figure 2 - Wiring for mA Output HumidityTransducer where Controller or
Meter has Internal DC Power Supply
RoHS RoHS
Mounting
HU-226 (DUCT) - Refer to Figure 6 for mounting dimensions.
1. Drill 5/8” hole in appropriate location.
2. Mount transducer on a vertical surface with two #8
self-tapping screws (not provided).
3. Pull wires through knockout and make necessary connec-
tions (see wiring diagrams).
4. Replace cover and tighten Philips screws.
Wiring
Use maximum 12 AWG wire for wiring terminals. Refer to
Figures 1, 2, 3, & 4 for wiring information and Figure 5 for dip
switch designations.
Wiring HU-226 Units with mA Output
HU-226 Humidity Transducer with mA Output
TYPICAL APPLICATIONS (wiring diagrams)
Neutral
Hot
+
Controller / Meter / Recorder
VDC Output Transducer Only 12-35 VAC Transformer
Figures 3 & 4 illustrate typical wiring diagrams for the HU-226, 0-5/0-10
VDC output humidity transducers.
Figure 3 - Wiring for VDC Output when applied with External AC Supply
Figure 4 - Wiring for VDC Output when applied with External DC Power
Supply
Signal
+
Common
Supply
O
+
Controller / Meter / Recorder
VDC Output Transducer Only 12-40 VDC Transformer
Input Signal
Common
HU-226 humidity transducers with VDC output are field selectable 0-5 VDC or
0-10 VDC output and can be powered with either 12-40 VDC or 12-35 VAC.
The following describes the proper wiring of these humidity transducers with
VDC output:
Wiring HU-226 Units with VDC Output
0 to 10 VDC
(Factory Default)
0 to 5 VDC
HU-226 Humidity Transducer with VDC Output
Caution: If you are using grounded AC, the hot wire must be on
the [+] terminal. Also, if you are using a controller without built-in
isolation, use an isolation transformer to supply the HU-226
transducer.
Caution: This product contains a half-wave rectifier power
supply and must not be powered off transformers used to power
other devices utilizing non-isolated full-wave rectifier power
supplies.
Caution: When multiple units are powered from the same
transformer, damage will result unless all 24G power leads are
connected to the same power lead on all devices. It is manda-
tory that correct phasing be maintained when powering more
than one device from a single transformer.
Figure 5 - Dip Switch Settings for HU-226 VDC Output
mA Output
VDC Output
+ - 0
ON
1
2
Z S
temp
TEMP SENSOR:
1. Remove the terminal block by carefully pulling it off the circuit board.
2. Use shielded 18-22 AWG wire to connect temp sensor as shown in
Figures 1 & 2.
Humidity
Temp
Temp
Input
Humidity
Temp
Input Signal
+
Common
Shield/Ground
Temp
Input
HUMIDITY SENSOR:
1. Remove the terminal block by carefully pulling it off the circuit board.
2. Locate the [+], [-] and [O] terminal markings on the board.
3. Attach the power wires to the [+] and [-] terminals. The [-] terminal is
also the negative output terminal.
4. Connect the [O] terminal, which is the positive VDC output terminal, to
the controller’s input terminal.
5. Re-insert the terminal block to the circuit board and apply power to the
unit.
6. Check the appropriate VDC output using a voltmeter set on DC volts
across the [O] and [-] terminals.
TEMP SENSOR:
1. Remove the terminal block by carefully pulling it off the circuit board.
2. Use shielded 18-22 AWG wire to connect temp sensor as shown in
Figures 3 & 4.
Input Signal
+
Common
Shield/Ground
Temp
Input
Input Signal
+
Common
Shield/Ground
Temp
Input
Humidity
Temp
Signal
+
Common
Supply
O
Humidity
Temp
HU-226
DUCT MOUNT
0 to 10 VDC (default)
0 to 5 VDC
1
2
O N
1
2
O N
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