6 - MAINTENANCE CHECKLIST
6.1 - Checklist for check points and maintenance intervals
The checklist contains a general overview of the planning that facilitates the inspections and maintenance of the AHU.
On the following pages there is a more detailed description of the individual components.
General AHU Maintenance Check List
Interval Month
Components
Check Points
Recommended Maintenance Operations
1
3
6
12
CASING
Panels
Contamination
Remove contamination with water and mild house hold
soap
Damage
Remove rust and touch-up with anti-rust primer and
paint
Doors
Operation of Hinges & Locks
Check locks and hinges operational function
Door Seals
Check for seal span and crack
DAMPER
Actuator
Installation
Check if correctly installed to the damper shaft
Blades
Seal and contamination
Check seal integrity, remove dirt with compressed air
Fitting
Check blades and rod bolts are tight
Opening
Check if blades can open and close to require angle
Rotation
Bushing and Linkage
Remove dirt from bushing and linkage rod with
compressed air
Operational
Check damper operational once power supply restored
FILTER
Flat Pre-filter
Physical condition and seal
pressure drop
Check filter sitting (rail) correctly each other.
Metallic filter
Check filter clip (frame) correctly installed.
Vee filter
Check and remove pollution and dirt
Bag filter
Filter replacement depend to degree of contamination
ELECTRIC
HEATER
Control
All electrical connection
Clean dirt with compressed air and check connection in
control box
Flow and thermostat sensor
Check the operational of flow and thermostat sensors
COIL
Fins
Contamination
Clean dirt with compressed air
Damage
Check fin alignment and comb fins
Coil Frames
Air by-pass
Check gap and seal with silicon sealant to avoid fresh air
by-pass
Headers
Seal
Water leakage
Check gap and seal with silicon sealant to avoid fresh air
by-pass
Incase tube leak, braze leak point
Eliminators
Contamination
Clean dirt with compressed air
Drain pan
Contamination
Clean dirt with vacuum cleaner
Water Flooding
Check and clean U-trap
FAN
Fan housing
Contamination
Check and remove dirt with compressed air
Bearing
Lubrication (re-grease type)
Check oil and re-grease every 6 months.
Wear
Check if physical bearing is good or replace with new
bearing
Blower
Contamination
Check and remove dirt with compressed air
Motor
Lubrication (re-grease type)
Check oil and re-grease every 6 months.
Drive (Pulleys
& Belts)
Fitting
Weekly check pulley fitting tightness to the shaft
Belt tensioning
Weekly check tensioning and tighten the belt if required
Wear
Check if belt in good condition or replace with good belts
Alignment
Weekly check pulley and belt alignment
Isolators
Fixing
Check all bolts not loose, tighten the bolts if required
Contamination
For spring isolators, check if rusted and touch-up with
anti-rust
Flexible
connection
Crack and leak
Check if any damage or air leakage, replace new flexible
connector if required
HEAT
WHEEL
Rotor
Contamination
Check and remove dirt with compressed air
Operational
Check rotor rotation
Motor and
Drive
Operational
Check rotor speed and verify with design rpm
Wear and tear
Check if belts with enough tension
Remember to de-energies all components and to ensure that the fan has stopped rotating, before the doors
and access covers are opened before inspections and maintenance take place.
12
