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The precise control of the Sentinel Totus D-ERV system, driven by the ventilation requirements of the room at any one time, means that the system is only running to the level required, using energy when it is needed. A range of sensors are employed to determine the occupancy of the rooms, and manage the system ventilation rates accordingly. This optimises the use of energy whilst meeting the legislation requirements of the building.

This compares to a "traditional" fixed volume system, which in general is either ON or OFF often using energy to ventilate an empty or half occupied room, over ventilating and wasting energy.

System Overview The Sentinel Totus D-ERV system is made up of 4 parts:
• Up to 90% energy recovery (EN 308)
• Low energy EC/DC motors
• Sentinel Totus D-ERV, Demand Energy Recovery control
• Sensors and Controls
The ventilation demands of the room are detected by the wall or ceiling mounted Sentinel Totus D-ERV sensors/switches. These communicate with the Sentinel Totus D-ERV unit, which in turn drives the fan to the required speed to deliver the airflow. As the ventilation is provided to the room, the sensors continuously feedback to the control unit, driving the fan motor to the exact level required in the room at any one time.

Hierarchical Control The system is controlled by on board electronics, with an LCD display showing fan status and allowing for simple commissioning and installation, whether as a local sensor control unit or linked into a building management system. The LCD display unit can be remotely mounted if required. 1. Switched on/off or minimum/maximum level control
In an environment such as an office, the system is activated and runs between minimum and maximum levels by a choice of sensors. • PIR Detector
• Thermostat
• Humidistat
• BMS (remote enable) 2. Hierarchical - maximum demand multi sensor input
Used with a combination of sensors, with a defined level of priorities to simultaneously control a number of atmospheric conditions within a room, such as a meeting room. • CO2/temperature - room mounted
• CO2 - duct mounted
• Building Management System (0-10V)

Constant Pressure extract Applied in a discreet central extract system, such as hotel bathrooms or apartment blocks, the system grilles and/or duct dampers are controlled by the presence of a person in the room or by achieving required levels of humidity. The central system will respond to the demand depending on the number of active rooms. • PIR/Humidity Extract Grille 125mm
• PIR 12 - 70m³/h
• Humidity: 12m³/h - 30% RH, 70m³/h - 75% RH
• Motorised Duct Dampers - 100mm - 315mm Dia. with built-in end stop adjustment
   for setting minimum and maximum volume and 24V On/Off or 0-10V DC proportional control options.

EC/DC energy saving fan motor benefits

• Higher efficiency at full speed - at 50% reduction in motor speed gives an 88% reduction in power usage.
• Continuous speed control across the full operating range giving an increased tolerance to high and low pressure.
• Low noise compared to a step control motor.
• Improved service life.
• Power input lost as heat is reduced by 1/3 compared to a conventional AC motor.
• Lower maintenance requirements and longer service life.

Typical EC/AC Motor Speed Control Comparison As can be seen from above motor comparisons, the EC/DC motor offers higher efficiencies when compared to AC motors, and also consumes less power under speed control, giving both the highest motor efficiency and lowest power consumption across the speed control range.

System Technology Sentinel Totus D-ERV is a closed loop controlled ventilation system. Employing a range of sensors to manage the system, demand is sensed by PIR, temperature, humidity, air quality or carbon dioxide sensors. Depending on the levels in the rooms, Sentinel Totus D-ERV’s fan speed is ramped up or down to control the parameters within the required limits. If the room is unoccupied, the system switches off, saving energy and cost to the business.
The unit standby power consumption is only 0.6 watts.

The EC/DC Energy Saving Fan Motor Technology

• Higher efficiency at full speed - at 50% reductio motor speed gives an 87.5% reduction in power usage
• Continuous speed control across the full opera range giving an increased tolerance to high low pressure.
• Low noise compared to a step control motor.
• Improved service life.
• Power input lost as heat is reduced by 1/3 comp to a conventional AC motor.
• Lower maintenance requirements and lon service life.

Sentinel Totus D-ERV utilises the latest EC/DC motor technology, which provides energy saving benefits even over DC motors. This technology is also infinitely speed controllable and offers increased energy savings across the complete speed control range when compared with conventional inverter drive solutions. The result is higher efficiency, reduced noise, accurate controllability, better speed control drawing less power and as a result better overall system performance. Volume reduction also increases energy recovery efficiency beyond the published figures. Sentinel Totus D-ERV can be used in a hierarchical system where maximum demand, for example temperature and/or CO2 gives priority control of the fan speed or a constant pressure system with room mounted PIR/grilles or in-line damper control.

Heart of EC/DC Motor

CO2 + Temp Room Sensor HVAC temperature and carbon dioxide room sensor for proportional ventilation control. Sensor will monitor both CO2 and temperature levels between the set points, the air flow rate following the higher of the 2 outputs. 24V DC SELV. 0 - 2000ppm CO2 working range. 0 - 50°C working range. Auto-calibrating NDIR Co2 absorption sensor. Dimensions:100 x 84 x 25mm (H x W x D).

CO2 + Temp Room Sensor Sensor monitors CO2 level in extract ducts from conference areas, offices, theatres etc. In proportional control mode, air flow rate tracks the CO2 level to improve indoor air quality. 24V DC SELV. 0 - 2000ppm CO2 working range. Auto-calibrating NDIR absorption sensor. Adjustable probe length. MAX. IP Rating 65.

Vent-Axia PIR A wall or ceiling mounted presence detector for use with Sentinel Totus D-ERV. Can be used in MIN - MAX mode or for direct damper control. Fits any UK single gang mounting box. Adjustable timer overrun (5-25 minutes). Range of detection up to 10 metres. Designed to meet IP43. Ambient operating temperature range 0°C to +50°C. Supply voltage 24V DC SELV.

Vent-Axia ThermoSwitch Automatically switches on fans on either a rise or fall in air temperature. Used for Trickle/ Boost operation. Setting range: +6°C to +30°C. IP20 rated. Sealed sensing mechanism. Mounting direct on surface only. Dimensions: 80 x 104 x 36mm (H x W x D). Volt free switch connection to Sentinel Totus D-ER, Demand Energy Recover.

PIR Grille PIR grille is on extract grille with an integral flap damper. Suitable for bathrooms and WC’s. The PIR function fully opens the damper when a person presence is detected. The opening time is fixed at 20 mins. Spigot size is 125mm. 12V AC SELV unit using the main transformer unit supplied. Integral PIR person presence sensor controlling damper. Auto-humidity control damper response at all times. 100° viewing angle. Temperature range 0 - 50°C. Dimensions: 158 x 150 x 35mm (H x W x D). MAX airflow 70m³/hr @100 Pa.

Dampers Two types available: a) MM type - opening shut/MIN to open/MAX controlled by switches and b) PC type - opening proportionally when controlled by sensors. Duct sizes available: 100, 125, 150, 200, 250 and 315. Industry standard actuators.

Power Supply For those situations where a separate 24V DC SELV supply source is required to power duct dampers. 24W output capacity. See F & W for connection details.

Inlet Cowl For these situations where there is no ducted inlet or extract and the unit is roof mounted. Offers, weather protection to ensuring air paths do not recirculate.

Sentinel Totus D-ERV is a new range of energy recovery ventilation systems for multi occupancy and variable demand rooms. Using energy efficient EC/DC fans, 90% HR with intelligent sensing and control, the system meets the ventilation requirements of both new builds and refurbishment projects.
Ideal for applications where the rooms are used at different times of the day by a variable number of people, the Sentinel Totus D-ERV system will monitor occupancy, ventilation rate and air quality, and respond accordingly to maintain the atmosphere within preset limits and recovery up to 90% of extracted energy.

Typical applications include

• A network of hotel bathrooms, flats or apartments, which require ventilation, but are only used in limited periods particularly in the morning and in the evening.
• School classrooms and lecture theatres which are only occupied during lesson time by a variable number of students, but when used must keep CO2 levels within prescribed limits.
• Office meeting rooms or open plan areas which again are used periodically during the day by a variable number of staff and visitors, but when occupied must meet required airflow rates.

Automatic sensing and control runs the system according to the maximum demand requirements of the building zone, whether it be carbon dioxide levels, temperature, humidity or air quality – triggered by people entering or leaving the rooms. Common configurations include Electronic Static Pressure (ESP) controllers for constant pressure systems.


Meeting Rooms and Classrooms


Network Supply and Extract hierarchical Sensor Control Typical networked supply and extract balanced hierarchical System with enabling switching control (ON/OFF, time clock or PIR) and proportional hierarchical maximum demand control from combined temperature and/or CO2 sensors.


Central Extract Controlled System - Hotels or Apartments


Electronic Static Pressure (ESP) Control Typical Central extract system using discreet in-line duct mounted dampers controlled by individual room mounted switching devices or proportional control sensors (MIN/MAX) within each toilet/bathroom to control individual extract zones. Fan speed control with electronic static pressure control (ESP) maintaining target pressure set point as individual zones open/close based on presence of occupants or Humidity sensor.