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SC-AR4
Analog Relay Module
Product Description
This document describes the hardware installation procedures for the SC-AR4 Analog Relay Module.
The analog relay module accepts an analog voltage or current signal and controls four output relays. The input signal has three jumper selectable ranges
for either 0-7.5 Vdc, 0-15 Vdc, or 0-20 mA. Each relay has an independently adjustable set-point which is set with a multi-turn trim pot.
Each form-C relay activates when the input signal is equal to the trip set-point and deactivates when the input signal falls below the set-point by a deadband
amount. The deadband is also jumper selectable for 1, 3, or 5% of the range.
Features include a regulated power output that can be used to power a transducer or a resistance input, top-adjust trim-pots for set-point adjustment, an
LED power indicator, status LEDs for each relay and 10 Amp form-C relays. The product comes with standard snap-track for easy mounting.
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.
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Avoid areas where corroding, deteriorating or explosive vapors, fumes or gases may be present.
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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.
Figure 1: SC-AR4 Analog Relay Module
I n s t a l l a t i o n G u i d e
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Summary of Contents for Distech Controls SC-AR4
- Page 1 Figure 1: SC-AR4 Analog Relay Module Product Description This document describes the hardware installation procedures for the SC-AR4 Analog Relay Module. The analog relay module accepts an analog voltage or current signal and controls four output relays. The input signal has three jumper selectable ranges for either 0-7.5 Vdc, 0-15 Vdc, or 0-20 mA.
- Page 2 Mounting Instructions The snap-track device may be mounted in any position. Use only fingers to remove the PCB from the snap-track, do not pry on the PCB with tools. Do not flex the PCB during removal or installation. Slide the PCB out of the snap-track or push against one side of the snap-track and lift the PCB out. See Figure 2.
- Page 3 Wiring Deactivate the 24 Vac power supply until all connections are made to the device to prevent electrical shock or equipment damage. Follow proper electrostatic discharge handling procedures when installing the device or equipment damage may occur. Use 22 AWG 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.
- Page 4 ©, Distech Controls 2020 All rights reserved. While all efforts have been made to verify the accuracy of information in this manual, Distech Controls is not responsible for damages or claims arising from the use of this manual. 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.
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