Distech Controls HS-O 2X Series Manual

Hardware Installation Guide
HS-O_2X Series
Outside Air Humidity Transmitter with Optional Temperature Sensor, Nema 4X
Figure 1: HS-O_2X Series Transmitter
Product Description
This document describes the hardware installation procedures for the HS-O_2X Series Transmitters.
This humidity transmitter uses a field replaceable, highly accurate and reliable Thermoset Polymer based capacitance humidity sensor
and state-of- the-art digital linearization and temperature-compensated circuitry to monitor humidity levels. The humidity sensor is
encapsulated in a 60 micron HDPE filter at the end of a 230 mm (9”) S/S probe. An optional temperature sensor is available. Available
with RH accuracies of 2%, 3% or 5%.
General Installation Requirements
For proper installation and subsequent operation of each device, pay special attention to the following recommendations:
- Upon unpacking the product, inspect the contents of the carton for shipping damages. Do not install damaged device.
- Avoid areas where corroding, deteriorating or explosive vapors, fumes or gases may be present.
- Ensure that all equipment is installed according to local, regional, and national regulations.
Personal injury or loss of life may occur if you do not follow a procedure as specified.
Equipment damage or loss of data may occur if you do not follow a procedure as specified.
Take reasonable precautions to prevent electrostatic discharges to the controller when installing, servicing or operating
the controller. Discharge accumulated static electricity by touching one’s hand to a well-grounded object before working
with the controller.

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Before Installation
Select a suitable mounting location on an exterior wall, where the HS- O_2X Sensors are best protected from direct exposure to
sunlight, wind, etc., preferably on a north-facing wall. Do not mount the transmitter near opening windows, supply/exhaust air louvres
or other known air disturbances. Avoid areas where the transmitter is exposed to vibrations or rapid temperature changes.
The HS-O_2X Sensors provide a connection hole for 1/2" NPT Conduit, and an M16 adapter and cable gland in Europe. Run a length
of conduit through an exterior wall and seal it. Use 14-22 AWG (2.08 mm2 to 0.205 mm2) shielded wiring for all connections and do
not locate the device wires in the same conduit with wiring used to supply inductive loads such as motors. Make all connections in
accordance with national and local codes.
Mounting
The HS-O_2X Sensors should be installed directly on an exterior wall using the two (2) integrated mounting holes provided on the
enclosure.Select the best mounting technique based on the exterior wall material.The mounting holes accept #10 x 1” (5mm⌀x 25mm
L) self-tapping screws (not included). The transmitter fitting must be pointing down.
The HS-O_2X Sensor Series enclosure has a hinged cover with a latch. Open the cover by gently opening the latch at right side of
the enclosure while pulling out the cover. Stick a conduit through the hole at the bottom of the enclosure and secure it with a locknut.
It isadvisable to use a weatherproof conduit or a cable gland. Completethe wiring connections as indicated in the illustrations of
the “Wiring” section.
Push the cover closed until it is securely latched. For optimal security, 2 screws are provided for installation in the integrated
screw tabs as shown in Figure 2.
Figure 2: Sensor Fitting
Wiring
Deactivate the 24 Vac/dc power supply until all connections are made tothe device to prevent electrical shock or equipment damage.
Use 14-22 AWG (2.08 mm2to 0.205 mm2) shielded wiring for all connections and do not locate the device wires in the same conduit
as wiring used to supply inductive loads such as motors. Make all connections in accordance with national and local codes.
Pull at least six inches (15 cm) of wire into the enclosure, then completethe wiring connection according to the wire diagram for the
applicable power supply and output signal type.
Select the desired signal output type (mA or Vdc) by placing the output switch in the required position, as shown in Figure 3. Factory
default is mA (4-20 mA).
If mA was selected, no further Output set-up is required. If VOLT output is selected (see Figure 3), place the Voltage Output switch in
the desired span position, as shown in Figure 4, i.e. 10 = 0-10 Vdc. The factory default is 10v = 0-10Vdc.
Connect the DC positive or the AC voltage hot side to the PWR terminal. For voltage output or AC power, the supply Common is
connected to the COM terminal. The device is reverse voltage protected and will not operate if connected backwards. It has a half-
wave power supply, so the Common supply is the same as the Common signal. See Figure 5.
The analog output is available on the OUT terminal. Check the controller Analog Input to determine the proper connection before
applying power, as shown in Figure 4.

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If installed, the resistance temperature output is available on the two terminals labeled TEMPERATURE SENSOR, as shown in Figure
6.
Figure 3: Wiring instructions

©, Distech Controls Inc. 2022 All rights reserved.
Distech Controls is not responsible for damages or claims arising out of improper or careless installation or handling of its products. Persons using this manual are
assumed to be trained HVAC specialist / installers and are responsible for using the correct wiring procedures and maintaining safe working conditions with fail-
safe environments.
Global Head Office - 4205 place de Java, Brossard, QC, Canada, J4Y 0C4 - EU Head Office - ZAC de Sacuny, 558 avenue Marcel Mérieux, 69530 Brignais, France
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Dimensions