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UNIT MAINTENANCE
9. Replace motor in reverse order.
10. To tighten belts, use prybar to assist in lifting motor into place whist tightening locking bolts. Larger motors will have
jacking bolts in the motor platform to hold the weight of the motor. Adjust these to the required length to achieve
correct belt tension.
Note:
a). Bolt tensions should be in accordance with bolt manufacturer’s recommendations for the bolt diameter, thread
type and material. All mount bolts should be high tensile and a minimum grade of 8.8. Anti-seize should be
used on all stainless steel bolts.
b). Belt Tensioner recommended when replacing/re-installing belts.
6.2.1.7 Belts
Replacement of drive belts needs to be conducted routinely. The frequency of replacement will be determined by hours
of operation, operational environment and previous maintenance schedule. Belts should be visually inspected monthly
with a thorough inspection every 3rd month.
Tools Required: Metric open-end ring spanner set, Drive belt tensioning gauge, Pry bar or lever bar and ½” Socket set.
The following are the recommended steps to replace the drive belts. Before works commence ensure all spare parts
ordered match that of the unit they are replacing. Aira units are often custom specified for each application and may
have components which differ from the standard product offering.
1. Electrically isolate unit.
2. Remove Blower Box access panels.
3. Loosen motor platform bolts.
4. Slacken and remove drive belt/s.
5. Check Pulleys for excess wear, replace if necessary.
6.
Replace Belt/s. For multiple drive belt units ensure that they are a matched set. Belts from different suppliers and
different batch lots will differ in length.
6.2.1.8 Pulleys
Pulleys are manufactured from steel or aluminium and will generally require replacement less than the drive belts. Any
wear on the pulleys will shorten the drive belt life, therefore should be replaced if there are any signs of wear.
Tools Required: Metric open end ring spanner set, Drive belt tensioning gauge, Pry bar or lever bar, ½” Socket set,
metric hex key set, nylon hammer.
1. Electrically isolate unit.
2. Remove Blower Box access panels.
3. Loosen motor platform to scroll nuts.
4. Slacken and remove drive belt/s.
5. Remove Pulley/s from Taperlock bush. A taper lock bush is used to secure the pulleys to the drive shaft. If
unsure on how to remove the taper lock bushes refer to the Fenner brand bush guide. Alternately contact Seeley
International for Service assistance.
6.2.1.9 Fan Direction
Check that the fan is blowing in the right direction. If the fan is running in reverse change check the wiring diagram and
swap the power to the motor.
6.2.2 Gas Components
6.2.2.1 Gas Controls
Gas controls and gas valve shall not be dismantled or serviced in the field. If necessary, faulty units should be replaced
with reconditioned or new units. Check before re-assembly that gas lines are clean and free from dirt and deposits.
After maintenance work has been carried out and the gas burner and gas controls have been re-assembled, check all
gas lines for leaks and check that all electrical terminals are secure.
NOTE:
All wiring must be done in accordance with applicable local codes. If any of the original wiring as supplied with
the appliance requires replacement, it must be replaced with wire with a temperature rating of at least 105°C.
6.2.2.2 Gas Connection Visual inspection
The incoming gas supply is to be visually inspected for damage and leaks. If visual damage is evident or gas can be
smelt, the supply is to be isolated and location of the leak to be identified and fixed. If any corrosion is present the gas
line is to be replaced.
