Vent-Axia GALAXY GDD Series Troubleshooting guide

Fleming Way,Crawley,
West Sussex. RH10 9YX.
Tel: [phone]
Fax: [phone]
•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 MΩthe 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, 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.
Please note a wide range of accessories for this product are available from Vent Axia
Incorporating Roof Units Limited.
OPERATION AND
MAINTENANCE INSTRUCTIONS
GALAXY™
TWIN FANS

•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 Incorporating Roof Units Limited), 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 Incorporating Roof Units Limited), 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.
•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.
Remove the cover from the fan terminal box. Connect the power supply from the local
isolator (via any appropriate controls if fitted) to the terminal box via an appropriate cable
gland. Refer to the wiring diagrams and select the appropriate connections for the fan,
controller or other devices as being installed. 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.
All fans are fitted with thermal protection, which is self re-setting, excluding GDD1 & GRD1. If
the thermal 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.
•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 Incorporating Roof Units Limited, 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.
The fans are supplied as a component to be incorporated into a ventilation system. The final
complete system installation that includes the fans MUST meet all relevant directives.
•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 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.
•BELT TENSION AND ALIGNMENT
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.
Force required to deflect belt 16mm per metre of span
Belt Section Small Pulley Dia. (mm) Newton (N) Force (kgf)
67 to 95 10 to 15 1.0 to 1.5
SPZ 100 to 140 15 to 20 1.5 to 2.0
100 to 132 20 to 27 2.0 to 2.7
SPA 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.

Vent Axia Incorporating Roof Units Limited Guarantee
Applicable only to products installed and used in the United Kingdom. For details of
guarantee outside the United Kingdom, contact your local supplier.
Vent Axia Incorporating Roof Units Limited guarantees its products for one year from the date
of purchase against faulty material or workmanship. In the event of any part being found to
be defective, the product will be repaired, or at the Company’s option replaced, without
charge, provided that the product:
1. Has been installed and used in accordance with the instructions given with each unit.
2. Has not been connected to an unsuitable electricity supply. (The correct electricity supply
voltage is shown on the product rating label attached to the unit.)
3. Has not been subjected to misuse, neglect or damage.
4. Has not been modified or repaired by any persons not authorised by the company.
If Claiming Under Terms Of Guarantee.
Please return the complete product, carriage paid to your original supplier or nearest Vent
Axia Incorporating Roof Units Limited Centre, by post or personal visit. Please ensure that it
is adequately packed and accompanied by a letter clearly marked ‘Guarantee Claim’ stating
the nature of the fault and providing evidence of date and source of purchase.
As part of the policy of continuous product improvement Vent Axia Incorporating Roof Units
Limited reserves the right to alter specifications without notice
Fleming Way,Crawley,
West Sussex. RH10 9YX.
Tel: [phone]
Fax: [phone]
84GALAXY-INST Revision ‘C’, 12/04/02.