Galaxy Roof Mounting Direct Driven Twin fans - GRD

At a Glance:
• Direct Drive Twin Fan (Run & standby)
• Backward curved centrifugal impellors
• Operating temperatures up to 40°C
• Performance range up to 2.72m3/s
• Static Pressure Development up to 500pa
• Speed controllable
• Quality assured to BS EN ISO 9001
• Performance listed to BS 848 Part 1

This product range is now obsolete and no longer available from Vent-Axia. The information here is provided for reference only.

The GRD Galaxy Roof Mounting, Direct Driven, Twin fan range represents the latest development from Vent-Axia in high performance, run and standby twin fans. Designed to be controlled inconjunction with Vent-Axia Trakmaster twin fan controller range, the total package offers the end user flexibility when interfaced with or without a (BMS) Building Management Systems, such as: manual selection; 12/24hr auto changeover ensuring the extended life of the fan and motor; night setback during low levels of occupancy for energy management control during 24hr extraction.

The unit casing is manufactured from mill finished aluminium fitted with a discharge aluminium weather Louvre with bird mesh as standard, ensuring suitability for exposed external environments. Assembly is controlled to BS EN ISO 9001. Optional acoustic lined casing is available.

Individual gravity return shutters are fitted as standard to prevent air recirculation through the standby fan or the system during shut down periods. The Galaxy Roof Twin Fans are suitable for horizontal mounting. When installed on a shallow pitch roof (max 20°) a special upstand will be needed to compensate for the angular difference – manufactured by others.

To meet COSHH requirements, double pole service isolator switches are fitted and pre-wired to the fans and mounted to the outer casing to reduce installation time and cost. Access to the fan section is via an easily removed top access panel for cleaning and maintenance during shut down periods.

The Galaxy range has ten models with extract performance ranging from 0.056m³/s up to 1.339m³/s (201m³/h to 4820m³/h), with pressure characteristics of up 400Pa. All models are supplied with inlet spigots on the underside of the unit casing and a HET9TF discharge anodised aluminium weather louvre.

Motors / Impellers

Galaxy features motors and DIDW forward curved centrifugal impeller assembly specifically chosen for performance. The assembly is dynamically balanced to ISO 1940 Grade G.6.3. Ball bearings are greased for life. Insulation is Class ‘B’ (from –15°C to + 40°C).

Electrical

All Motors are single phase 220-240V 50 Hz. The isolator is supplied with all models with PG11 entry protected against dust and water jets from any angle for external use. All motors are fitted with Standard Thermal Overload Protection (S.T.O.P.) motor protection by means of a thermal contact switch incorporated in the windings to prevent motor damage by overloading/overheating.

Performance
GRD fan performance is tested in accordance with Test BS 848 Part 1.

Sound Levels
Sound levels are measured in a reverberant chamber in accordance with BS 848 Part 2. Published dB(A) figures are free field sound pressure levels at 3m with spherical propagation at a reference level of 2 x 10–5Pa (20 micro-Pascal). The inlet and outlet sound power level spectra figures are dB with a reference of 10–12 Watts (1 pico-watt). To ensure minimum noise levels during speed control, an auto transformer speed control is recommended.

Quality Assurance
Design and manufacture are in accordance with the standard for quality management system BS EN ISO 9001.

DIMENSIONS:

Unit a b c d e f g h j k Weight kg
GRD1X 250 670 500 500 150 100 150 85 490 75 11
GRD2 340 750 700 700 225 150 150 25 690 75 22
GRD2X 340 750 700 700 225 150 150 25 690 75 22
GRD2XH 340 750 700 700 225 150 150 25 690 75 22
GRD3 390 750 700 700 250 150 150 25 690 75 21
GRD4S 450 850 800 800 300 200 150 25 790 75 32
GRD4 450 850 800 800 300 200 150 25 790 75 32
GRD5 550 1000 950 950 500 250 150 25 940 75 55
GRD6 550 1050 1050 1050 600 300 150 - 1040 75 65
GRD7 650 1250 1150 1150 750 350 150 50 1140 75 65
Image of Trackmaster Twin Fan Controller (ITC)
Trackmaster Twin Fan Controller (ITC)
The ITC model provides automatic changeover on fan failure as well as enabling a manual selection of either fan for duty sharing or test purposes. (BMS compatible via volt free contacts). This controller must have a permanent live supply. Any On/Off switching must be via the sensor connections S1 and SG terminals.
Please call 0344 856 0590 for further availability information.
Image of Trackmaster Twin Fan Controller (ITC-DS)
Trackmaster Twin Fan Controller (ITC-DS)
The ITC-DS model (Duty sharing). Incorporates a timing mechanism which operates alternate fans on 12 or 24 hour intervals, thus ensuring the extended life of the fan bearings. The controller also provides automatic changeover on fan failure along with the facility for manual selection of either fan. (BMS compatible via volt free contacts). This controller must have a permanent live supply. Any On/Off switching must be via the sensor connections S1 and SG terminals
Please call 0344 856 0590 for further availability information.
Image of RSC - Remote Setback Control
RSC - Remote Setback Control
The RSC multi-speed control system offers 2 speed fan versatility eg. Energy Management for night-time setback. Can be used in conjunction with Vent-Axia ITC, ITC-DS controllers using 5 step auto-transformer speed controllers for speed selection. Uses 24V output from ITC controller. Dimensions: 86mm x 178mm x 100mm (Width x Height x Depth)
Please call 0344 856 0590 for further availability information.
Image of Remote Visual Indicator (RVC)
Remote Visual Indicator (RVC)
Wired in conjunction with either an ITC or ITC-DS controller the RVC can be located up to 100m away using low cost ELV wiring. The compact, single gang RVC ELV (Extra Low Voltage) remote visual controller indicates status of Fan 1 and Fan 2 with status/warning lights. Push button allows Fan 1 and Fan 2 with standby (Off) to be selected.
Please call 0344 856 0590 for further availability information.

Overview

The GRD Galaxy Roof Mounting, Direct Driven, Twin fan range represents the latest development from Vent-Axia in high performance, run and standby twin fans. Designed to be controlled inconjunction with Vent-Axia Trakmaster twin fan controller range, the total package offers the end user flexibility when interfaced with or without a (BMS) Building Management Systems, such as: manual selection; 12/24hr auto changeover ensuring the extended life of the fan and motor; night setback during low levels of occupancy for energy management control during 24hr extraction.

The unit casing is manufactured from mill finished aluminium fitted with a discharge aluminium weather Louvre with bird mesh as standard, ensuring suitability for exposed external environments. Assembly is controlled to BS EN ISO 9001. Optional acoustic lined casing is available.

Individual gravity return shutters are fitted as standard to prevent air recirculation through the standby fan or the system during shut down periods. The Galaxy Roof Twin Fans are suitable for horizontal mounting. When installed on a shallow pitch roof (max 20°) a special upstand will be needed to compensate for the angular difference – manufactured by others.

To meet COSHH requirements, double pole service isolator switches are fitted and pre-wired to the fans and mounted to the outer casing to reduce installation time and cost. Access to the fan section is via an easily removed top access panel for cleaning and maintenance during shut down periods.

The Galaxy range has ten models with extract performance ranging from 0.056m³/s up to 1.339m³/s (201m³/h to 4820m³/h), with pressure characteristics of up 400Pa. All models are supplied with inlet spigots on the underside of the unit casing and a HET9TF discharge anodised aluminium weather louvre.

Motors / Impellers

Galaxy features motors and DIDW forward curved centrifugal impeller assembly specifically chosen for performance. The assembly is dynamically balanced to ISO 1940 Grade G.6.3. Ball bearings are greased for life. Insulation is Class ‘B’ (from –15°C to + 40°C).

Electrical

All Motors are single phase 220-240V 50 Hz. The isolator is supplied with all models with PG11 entry protected against dust and water jets from any angle for external use. All motors are fitted with Standard Thermal Overload Protection (S.T.O.P.) motor protection by means of a thermal contact switch incorporated in the windings to prevent motor damage by overloading/overheating.

Performance
GRD fan performance is tested in accordance with Test BS 848 Part 1.

Sound Levels
Sound levels are measured in a reverberant chamber in accordance with BS 848 Part 2. Published dB(A) figures are free field sound pressure levels at 3m with spherical propagation at a reference level of 2 x 10–5Pa (20 micro-Pascal). The inlet and outlet sound power level spectra figures are dB with a reference of 10–12 Watts (1 pico-watt). To ensure minimum noise levels during speed control, an auto transformer speed control is recommended.

Quality Assurance
Design and manufacture are in accordance with the standard for quality management system BS EN ISO 9001.

Technical

DIMENSIONS:

Unit a b c d e f g h j k Weight kg
GRD1X 250 670 500 500 150 100 150 85 490 75 11
GRD2 340 750 700 700 225 150 150 25 690 75 22
GRD2X 340 750 700 700 225 150 150 25 690 75 22
GRD2XH 340 750 700 700 225 150 150 25 690 75 22
GRD3 390 750 700 700 250 150 150 25 690 75 21
GRD4S 450 850 800 800 300 200 150 25 790 75 32
GRD4 450 850 800 800 300 200 150 25 790 75 32
GRD5 550 1000 950 950 500 250 150 25 940 75 55
GRD6 550 1050 1050 1050 600 300 150 - 1040 75 65
GRD7 650 1250 1150 1150 750 350 150 50 1140 75 65

Accessories

Image of Trackmaster Twin Fan Controller (ITC)
Trackmaster Twin Fan Controller (ITC)
The ITC model provides automatic changeover on fan failure as well as enabling a manual selection of either fan for duty sharing or test purposes. (BMS compatible via volt free contacts). This controller must have a permanent live supply. Any On/Off switching must be via the sensor connections S1 and SG terminals.
Please call 0344 856 0590 for further availability information.
Image of Trackmaster Twin Fan Controller (ITC-DS)
Trackmaster Twin Fan Controller (ITC-DS)
The ITC-DS model (Duty sharing). Incorporates a timing mechanism which operates alternate fans on 12 or 24 hour intervals, thus ensuring the extended life of the fan bearings. The controller also provides automatic changeover on fan failure along with the facility for manual selection of either fan. (BMS compatible via volt free contacts). This controller must have a permanent live supply. Any On/Off switching must be via the sensor connections S1 and SG terminals
Please call 0344 856 0590 for further availability information.
Image of RSC - Remote Setback Control
RSC - Remote Setback Control
The RSC multi-speed control system offers 2 speed fan versatility eg. Energy Management for night-time setback. Can be used in conjunction with Vent-Axia ITC, ITC-DS controllers using 5 step auto-transformer speed controllers for speed selection. Uses 24V output from ITC controller. Dimensions: 86mm x 178mm x 100mm (Width x Height x Depth)
Please call 0344 856 0590 for further availability information.
Image of Remote Visual Indicator (RVC)
Remote Visual Indicator (RVC)
Wired in conjunction with either an ITC or ITC-DS controller the RVC can be located up to 100m away using low cost ELV wiring. The compact, single gang RVC ELV (Extra Low Voltage) remote visual controller indicates status of Fan 1 and Fan 2 with status/warning lights. Push button allows Fan 1 and Fan 2 with standby (Off) to be selected.
Please call 0344 856 0590 for further availability information.

Downloads