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22. 09. 20. Document Number 671188
Nuaire |
Western Industrial Estate
|
Caerphilly
|
CF83 1NA
|
nuaire.co.uk
ESBH
Installation Manual
5.2 Mechanical
•
Wet systems require the setting of the flow valve. Set as general
commissioning procedures - refer to the specified design flow
duties and the documentation attached to each valve.
•
Frost protection must be incorporated on shut down and
fresh air conditions to avoid the coil and associated pipework
freezing. Ideally, where the system is at risk of frost damage,
the addition of a proprietary antifreeze solution to the water is
recommended.
•
DX coils have two separate cooling stages with independent
condenser units, the coils are supplied with ends sealed.
Connection, commissioning and setting to work is the
responsibility of the condensing unit installer
6.0 MAINTENANCE
It is important that maintenance checks are recorded and that the
schedule is always adhered to, in all cases, the previous report should
be referred to.
Isolate from power supply before removing any covers. During
installation / maintenance ensure all covers are fitted before
switching on the mains supply.
An Inverter is used to provide speed control. When the fan is
isolated, allow 5 minutes for the capacitors in the inverter to
discharge before commencing any work on the unit.
6.1 Routine Maintenance
•
Clean all areas of unit and treat any areas of corrosion.
•
Check all access doors for leakage and if necessary locks should be
adjusted and any replacement gasket materials should be replaced
as required.
•
Any drain trays should be cleaned and repaired if necessary.
6.2 Every 3 Months
•
Check filters and change/clean if required, failure to do so may
impair the performance and energy efficiency of this unit.
•
Ensure condensate drains are cleaned clear and that water can
flow freely from unit.
•
Check fin coil banks and heat exchangers. If necessary clean with a
soft brush or vacuum. Check for signs of contamination.
6.3 Annually
•
Thoroughly inspect the unit and its components for corrosion,
acting immediately to treat/restore any damaged areas.
•
All electrical terminals within the unit should be tightened.
•
Check all earth connections.
•
Check control dampers blades.
•
Check operation of damper actuators and linkages and adjust as
necessary.
•
Coil faces should be inspected and any dust removed.
6.4 Checking Belt Tension
•
Measure the span length (Figure 27).
•
At the centre of the span, apply a force at right angles to the belt
sufficient to deflect one belt 16mm for every metre of span length
(Figure 27). The force required to deflect the ‘V’ belt should be
from 0.5kg to 0.8kg.
•
Tighten the pinch bolts.
6.5 Adjusting Drive Belt Tension (Sizes 3-6)
To check the correct tension of a drive belt, apply a force at right angles
to the centre of the belt span sufficient to deflect the belt 16mm for
every metre of span length (Figure 26). The force required to deflect the
‘V’ belt should be from 0.5kg to 0.8kg.
Anti-vibration moutings
Deflection
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Adjusting Drive Belt Tension (Sizes 3-6)
6.6 Adjusting Drive Belt Tension (Size 7)
All belt drive units incorporate belt tensioning devices. To adjust the
belt tension, slacken the pinch bolt on the sides of the motor plate.
Turn the adjusting bolt clockwise to tighten the belt and counter
clockwise to loosen it. The drive should be tensioned until a slight bow
appears in the slack side of the ‘V’ belt when running under load.
Span
Force
Adusting Bolt
Pinch Bolt
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Adjusting Drive Belt Tension (Size 7)
6.7 Changing a Drive Belt
To replace a belt, remove the two bolts from the motor mounting
furthest from the fan and slacken the remaining two bolts. Lift the
motor plate and remove the belt. Replacing the belt is the reverse of
this procedure.
7.0 WARRANTY
The 5 year warranty starts from the day of delivery and includes parts
and labour for the first year. The remaining period covers replacement
parts only.
This warranty is void if the equipment is modified without
authorisation, is incorrectly applied, misused, disassembled, or not
installed, commissioned and maintained in accordance with the details
contained in this manual and general good practice.
The product warranty applies to the UK mainland and in accordance
with Clause 14 of our Conditions of Sale. Customers purchasing from
outside of the UK should contact Nuaire International Sales office for
further details.
Failure to maintain the unit as recommended will invalidate the
warranty.