Vent-Axia GALAXY GDB Series Assembly instructions

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Installation and Wiring Instructions
PLEASE READ ALL INSTRUCTIONS CAREFULLY BEFORE STARTING INSTALLATION.
THESE INSTRUCTIONS SHOULD BE LEFT WITH THE END USER.
GALAXY™
TWIN FANS
GDB:Galaxy In-line belt driven, twin fan
GDD:Galaxy In-line direct driven, twin fan
GRB:Galaxy Roof mounting belt driven, twin fan
GRD:Galaxy Roof mounting direct driven, twin fan
Model Ranges
GBD
GDD
GRB
GRD

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STORAGE / INSTALLATION
The unit must be stored in clean, dry conditions. DO NOT install these fans in areas where the following may be
present:-
1) Excessive oil or grease laden atmosphere.
2) Corrosive or flammable gases, fluids or vapours.
3) Ambient temperatures higher than 40oC and below -15oC.
4) Relative humidity above 95%
5) Possible obstructions which will hinder removal.
6) Sudden ductwork transformations close to the unit.
If the unit is to be stored for a long period of time the fan impeller must be rotated by hand at monthly intervals to
prevent hardening of the lubricant and corrosion or static indentation of the bearings.
It is recommended that before installation the resistance to earth should be measured and if found to be less than
2 Mthe motor should be dried out before applying mains voltage.
IMPORTANT - SAFETY
All air moving equipment may present electrical, mechanical or noise hazards either during installation or
during operation. These instructions are meant to help in the prevention and / or minimisation of these
hazards. It is important that due consideration is given to the implementation of these instructions and to
due attention being given to applicable statutory requirements.
Potential hazards from rotating parts that can be reached during operation must be eliminated by using
appropriate guards meeting statutory requirements.
All electrical installation must be undertaken by a suitably qualified and competent person and must be
carried out in accordance with all relevant Statutory Requirements. Please check the details on the unit
rating plate to ensure that the correct power supply (Voltage, Frequency, and Phase) is available. Do not use
the fans with an incorrect power supply, as overheating and failure of the motor will occur.
All fans generate noise during operation. Dependant on the installation sound attenuators or other acoustic
treatment may be necessary to achieve acceptable noise levels in the ventilated area or the area surrounding
the fan installation. The product catalogues indicate the noise levels generated by the equipment in standard
test situations. The installed condition may affect the actual noise levels experienced in operation.
When the fan is installed in a room containing a fuel burning appliance, the installer must ensure that air
replacement is adequate for both the fan and the fuel burning appliance. If the fan can be used to supply air
into the room, the installer must ensure that the fan intake is located at least 600mm away from any flue
outlet.
The appliance is not intended for use by young children or infirm persons without supervision.
Please note a wide range of accessories for this product are available from Vent Axia Limited.

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MOUNTING
Galaxy belt and roof mounted direct drive fan units, must only be installed horizontally. The lid of the roof
mounting unit should be removed to gain access to fit M10 coach screws (not supplied by Vent Axia), when curb
mounting.
The optional mounting brackets (2 off brackets per unit) are recommended, when mounting the duct mounted units
(GDD & GDB). Holes will need to be drilled on each side of the unit to correspond with the respective number of
holes provided on each support bracket (4 off – GDB and 2 off – GDD). Secure each bracket in place utilizing
relevant fixings (not supplied by Vent Axia), ensuring they are level with each other and the unit.
Duct mounted direct drive (GDD) units may be mounted for bottom access by making a small change to the
shutters as follows:
1) Remove the lid of the unit and the retaining screws of the outer shutter brackets.
2) Move the nylon bushes to the vacant holes in all shutter brackets.
3) Reassemble shutter flaps into the nylon bushes.
4) Refit the retaining screws of the outer brackets and refit the lid of the unit.
CHECK LIST
1) Are all links and wiring complete (refer to wiring diagrams)?
2) Are all fixings secured?
3) Are all relevant guards fitted?
4) Are all protective circuit devices fitted and wired correctly?
5) Are all terminal box covers and gland fittings secure?
6) Are all earth connections secured?
7) Check that no hazard exists for persons in the locality of the fan. Check that the fan rotation is correct as per the
direction arrows on the fan plate / casing. If not isolate power supply and check wiring.
8) Check that the current (amps) taken by the fan does not exceed the current shown on the rating plate.
9) Ensure rotation of impeller is correct. Incorrect rotation may cause irreversible damage to the motor. Three
phase units require a trial connection, to reverse direction interchange any two supply leads.
RESPONSIBILITY
Vent Axia, as suppliers of the equipment, cannot be responsible for the final installation and electrical connection
of the product on site. We have made reasonable effort to offer guidance and assistance but the installer and
electrical contractor on site have a responsibility for ensuring the equipment is safely and securely installed and
electrically / mechanically safe in accordance with statutory requirements.
INSPECTION
These pieces of equipment require maintenance, cleaning and inspection, therefore allow reasonable access for
these operations to be carried out by a suitably qualified person, safely.
ISOLATE ALL POLES FROM POWER SUPPLY AND ENSURE POWER CANNOT BE RE-
CONNECTED BEFORE ANY WORK IS CARRIED OUT.
It is recommended that the fan be inspected after three months or sooner if conditions dictate. If a build up of dirt /
deposits is evident then this should be carefully cleaned off. Please take care not to damage the fan or affect the
balance of the impeller motor assembly (balance weights may be fitted to the impeller).
Further inspections should be carried out periodically as necessary dependant on experience and site conditions.
It is recommended that a minimum of two inspections per year be carried out.
The fan motors are fitted with “sealed for life” bearings and, under normal circumstances, should not require
maintenance.

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BELT TENSION AND ALIGNMENT (Belt driven units)
The belt tension and alignment should be checked:-
1) When fitting new belts, installing a new fan or just prior to starting the fan for the first time.
2) After the first 30 minutes of operation.
3) At least every 6 months.
Alignment
Ensure that the pulleys are correctly aligned before checking the belt tension and after any adjustments.
Method For Checking Belt Tension
Using a belt tension indicator, with metric calibration:-
1) Multiply the centre distance (in metres) by 16, this gives the deflection distance in mm.
2) Set the lower marking ring to the deflection distance required in mm on the lower scale.
3) Set the upper marker ring against the bottom edge of the top tube.
4) Place the tension indicator on top of the belt at the centre of span and apply a force at right angles to the belt
deflecting it to a point where the lower marker ring is level with the top edge of the adjacent belt. (For single belt
drives a straight edge should be placed across the two pulleys to act as a datum for measuring the deflection).
5) Read off the force value indicated by the top edge of the upper marking ring.
6) Compare this value to the kgf value shown in the table below.
Belt Section
Force required to deflect belt 16mm per metre of span
Small Pulley Dia.
(mm) Newton (N) Force (kgf)
SPZ 67 to 95 10 to 15 1.0 to 1.5
100 to 140 15 to 20 1.5 to 2.0
SPA 100 to 132 20 to 27 2.0 to 2.7
140 to 200 28 to 35 2.8 to 3.5
If measured force falls within the values shown then the drive should be satisfactory. A measured force below the
lower value indicates under tensioning.
Adjustment
The belt tension can be adjusted by displacing the motor. After any adjustment, re-check belt alignment.
Replacement Of Drive Components
1) Belts: - The drive belts should be replaced periodically as they are worn. First move the motor toward the fan by
a sufficient amount to allow the belts to be removed from the pulleys. All the belts in a drive should be replaced
simultaneously. Ensure that the replacement belts are all matched (i.e. are exactly the same length). The new
belts should be re-tensioned and aligned as per previous instructions and checked at the intervals stated.
2) Pulleys: - Belt drive units are normally fitted with taperlock pulleys and bushes.
3) Removal: - Remove the grub screws and oil lightly. Screw one of them into the extractor hole (on larger bushes
two extractor holes are provided in which case two grub screws should be used). Tighten the screw(s) until the
bushes are released from the hub of the pulley and the bush is released from the shaft. Pull the bush and pulley
from the shaft as one unit.
4) Fitting: - Clean the bore of the pulley and the bush to ensure that all surfaces are free of grease and dirt. Fit the
bush into the pulley. Oil the grub screws lightly and screw them by hand into the tapped holes between the
pulleys and bush. Clean the fan shaft and fit the bush and pulley as one unit. Tighten the grub screws alternately
whilst checking that the pulleys are in line until all of the screws are securely tightened. Fit the belt(s), re-
tension and re-check the alignment of the drives as previously described.

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GDB Galaxy In-line Belt Driven, Twin fan
Unit ABCDEFGWeight kg
GDB1 480 850 1000 650 250 110 790 125
GDB2 540 1100 1175 762 305 116 790 175
GDB3 675 1250 1450 900 400 135 1090 210
GDB4 765 1500 1450 1000 457 153 1090 270

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GDD Galaxy In-line Direct Driven Twin fan
Unit abcdefWeight kg
GDD1 210 530 425 175 100 55 20
GDD1X 210 530 425 175 100 55 20
GDD2 260 740 525 225 150 55 20
GDD2X 260 740 525 225 150 55 20
GDD2XH 260 740 525 225 150 55 20
GDD3 330 740 600 250 150 90 20
GDD4S 390 900 700 350 200 95 30
GDD4 390 900 700 350 200 95 30
GDD5 440 1000 800 400 325 57 52
GDD6 440 1000 800 450 350 44 59
GDD7 575 1250 1000 650 400 86 64

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GRB Galaxy Roof Mounting Belt Driven Twin fan
Unit ABCDEFGHJWeight kg
GRB1 500 900 1100 900 500 250 247 100 900 90
GRB2 600 1150 1175 1120 762 305 150 27.5 1120 120
GRB3 700 1450 1450 1450 900 400 150 - 1450 195
GRB4 800 1550 1450 1550 1000 450 150 - 1450 215

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GRD Galaxy Roof Mounting, Direct Driven
Unit abcdefghjkWeight kg
GRD1 250 670 500 500 150 100 150 85 490 75 11
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

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GENERAL WIRING
Warning:- The Fan And Ancillary Control Equipment Must Be Isolated From The Power Supply During Installation
And / Or Maintenance. The Equipment Must Be Earthed.
All-pole disconnection must be incorporated into the fixed wiring.
Only fixed wiring in conduit is required. Flexible cord must not be used.
1. Remove the cover from the fan terminal box.
2. Connect the power supply from the local isolator (via appropriate controls) to the terminal box/switch via an
appropriate cable gland.
3. Refer to the wiring diagrams and select the appropriate connections for the fan, depending on the controller or
other devices being installed.
4. Wiring instructions for the control equipment being used should be considered when making connections to
the fan terminals.
5. Controls must include non-self resetting overload protection.
6. In addition to non-self resetting overload protection, 3 phase products must be provided with single phasing
prevention.
7. Where products have TK connections on the fan terminal strip, these are independently connected to a
thermal switch in the windings of the motor and should be used as part of the control system.
8. Ensure that all earth connections have been made.
After completing and checking the connections to the terminal box, replace the terminal box lid ensuring that the
gasket is correctly seated in place. Ensure that all cable gland / grommet fixings and terminal box lid fixings are
tightened correctly to prevent water ingress.
Non-self resetting protection must be provided for this range of fans. If the protection device operates you MUST
check for the cause before allowing the fan to resume operation. Failure to do so may cause damage to the motor
and invalidate the guarantee.
Fuses in the circuit should be regarded as only protecting the wiring against short circuits or earth faults; they are
not suitable for overload protection. Fuse ratings must be able to carry starting loads, which can be taken as a
maximum of six times the running current for 25 seconds.

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:
GRD1
GRD2
GRD3
GRD4
GRD4S
GRD5
GRD6
GRD7
GRD1X
GRD2X
GRD2XH

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GDD1
GDD2
GDD3
GDD4
GDD4S
GDD5
GDD6
GDD7
GDD1X
GDD2X
GDD2XH

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
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UK NATIONAL CALL CENTRE, Newton Road, Crawley, West Sussex, RH10 9JA
SALES ENQUIRIES: Tel: [phone] Fax: [phone]
TECHNICAL SUPPORT: Tel: [phone] Fax: [phone]
For details of the warranty and returns procedure please refer to www.vent-axia.com or write to Vent-Axia Ltd, Fleming Way, Crawley, RH10 9YX
As part of the policy of continuous product improvement Vent-Axia reserves the right to alter specifications without notice.
84GALAXY-INST E 0613