AC24 – HVAC controller

Product Information

• Overview

  This is a unique SPLat Controller that has been specially designed for Heating and Ventilation Control. It uses the same SPLat language that you’ve come to know and love, complete with multitasking (32 processes for the price of one) and floating point support. What makes it special is its focus on 24VAC compliant inputs and outputs that is the most common voltage used throughout the HVAC industry.

  This special focus on 24VAC means this controller can be directly installed in air-conditioner and/or heaters to control all the soleniods directly. In addition, the built-in thermistor inputs provide the most inexpensive method of accurate temperature measurement.

  LCD Option

  

  To minimise cost, the AC24 does not include an HMI.

  Be happy though because a full size 20×4 alphanumeric LCD with plenty of buttons can be connected up to miles away from the controller. All you need is a minimum of 2 core shielded wire.

  Have a look at either the
  UI420 controller or the
  HD8 controller.

• Features

  • 8 x bi-directional 24 VDC I/Os. Each one can be either a ground switched input or a ground switching output (NPN)
  • 8 x 24 Volt AC or DC inputs
  • 1 x separate analog input measures the power supply voltage
  • Onboard 24 VDC regulator can provide up to 600mA of power for add-on boards, external solenoids, relays etc.
  • Onboard power indicators for both fused circuits (blown fuse indication)
  • Board can accept 24 VAC or 24 – 36 VDC input power, jumper selectable
  • 2 x analog inputs can be configured for 0-10VDC, 4-20mA or direct connection of thermistor temperature sensors all at 10 bit resolution. Typically 0.1°C resolution with thermistors.
  • HMI interface for either a 2 x 16 alpha numeric display with buttons or a 4 x 20 alpha numeric display with buttons
  • 8 x relay outputs. Relays switch the input power high side. Each is rated 24Volts@15 Amp (resistive load). Relays are fed via one shared 6 Amp fuse.
  • 8 x DIP switches for on-site configuration
  • 1 x 0-10VDC analog output, 10 bit resolution
  • Separate onboard fusing for relay switched outputs (3AG) and auxiliary power (M205)
  • Onboard programmable Red/Green status LED
  • ModBus protocol as well as user programmed protocol via TTL serial port
  • Supports our large range of I/O expansion and special-purpose Xwire add-ons. Xwire expansion interface uses RS485 electrical interface for rugged communications in industrial environments.
  • Customizable – just ask us!