Introduction
20
ARTUS™ Technical Manual 9690348 v3_04_2020
Controls
Overview
Unlike traditional fan coils, the control system and valve arrangement are fully integrated into each Artus as standard.
The Artus controller is a native BACnet device and is fully tested, and certified by the BACnet association.
Features
Thermal Control
–
Integrated controller enables the Artus to control autonomously to demand, using a proportional
control valve, changeover valve (option) and an EC fan to ensure optimum efficiency.
Easy Integration
- Easy integration to any BACnet BMS product. BACnet MS/TP and IP variants are available.
Master/Slave
- The provision for Artus control systems to interact with each other as master-slave using BACnet is
inherent in every Artus controller.
Room Operator Unit
– Wall terminal using KNX fieldbus. Indication of operation and setpoint adjustment is possible via
this display. No external power is required.
Cost Effective Networking
– To minimize installation time and costs, two network switched RJ45 sockets are provided
on the side of the Artus, allowing a communication network between units to be daisy chained units. (BACnet IP option
only).
Setup
- The controller behaves as a web server and provides a web based user interface. This can be used to setup,
commission and balance Artus units on the building network. The web pages allow you to monitor and operate available
data points.
Operation
The Artus controls to return air, using a proportional control valve as the primary method of satisfying demand. The
fan remains at a minimum speed when there is no cooling or heating demand and increases with demand. The control
valves provide isolation, dictating whether the units is cooling or heating in the case of full function units. The supply
air temperature is also monitored to determine failures in cooling and heating. The Artus control system indicates pre-
configured alarms via BACnet. While the specific details, can be determined on a supervisory system, a general alarm,
is indicated with a red LED at the controller electrical panel. The alarm LED is visible through the fascia. The controls
diagram shows the default/ typical arrangement. The settings are all configurable, allowing adjustment of gradient,
minimum or maximum fan speeds.
LED Alarm Indication
This illuminates with any combination of the following:
●
Temperature Discrepancy*
- Supply air is monitored during operation to ensure the required heating or cooling is
taking place. This alarm is indicative of a changeover valve failure, control valve failure, fan failure or blocked filter.
●
Condensate High Level*
- Alarms if there is a fault with the condensate pump and unable to remove condensate
from the unit.
●
Return Air Sensor Fault*
- The return air sensor is out of limits and is therefore out of calibration or open circuit.
●
Supply Air Sensor Fault
- The supply air sensor is out of limits and is therefore out of calibration or open circuit.
*This alarm will interrupt operation.
100
100
0
100
0
100
0
0
100
100
0
100
0
100
0
0
Heating Band
Cooling Band
Deadband
Fan Speed (3)
Fan Speed (3)
Control Valve
Position (2)
Control Valve
Position(2)
Changeover
Valve (1)
Temperature
Setpoint
Heating
Cooling
%age
Cooling
%age
Heating
-ve Drift
+ve Drift
ARTUS™
Comfort
