Daikin Double Skin Modular Air Handling Unit DS2TB-0713

CAUTION! HIGH AIR TEMPERATURE IN THE FAN SECTION CAN CAUSE MOTOR OVERHEAT AND DAMAGE. ON DRAW-THROUGH AIR HANDLERS, ADJUST THE DISCHARGE AIR TEMPERATURE OF THE HEATING SECTION NOT TO EXCEED 1040 F (400C)

Make sure to completely isolate the Electrical source

Re-check and Re-tension the drive belts due to stretch

Check and adjust the pulley alignment to ensure the motor fixing is properly secure

Check all bearing, wheel bolts & nuts and sheave set screws (or cap screw) are in secure position

Sign off on the air handling unit check

Ensure a positive seal between the rotor face and frame structure

Check if the seals are intact and contact the casing and rotor media

Check if there is excessive wear

Ensure there is no significant leakage between the casing and interconnecting duct work

Check for misalignment of the drive belt on the pulley or periphery of the rotor

Check the belt joint. Replace it, if necessary

Check for contamination, damage, microbial growth and corrosion

Describe the contamination, damage, microbial growth and corrosion found

Check spray nozzles for deposits

Describe the deposits found on the spray nozzles

Check functionality of the conductivity sensor

Describe the issues found with the conductivity sensor

Check moisture eliminator for contamination, damage, scaling and corrosion

Describe the contamination, damage, scaling and corrosion found on the moisture eliminator

Check the region downstream of droplet eliminator after cleaning

The unit should be maintained in line with the manufacturer’s recommendation

Please refer to the installation and maintenance manual for details

For Hygienic and Clean AHU, the face of the heat wheel should be inspected regularly for dust and dirt to check if the self cleaning due to counter flow and rotation of the heat wheel is insufficient

For a small amount of dirt, use a vacuum cleaner to clear off the dirt

For more stubborn dirt, use compressed air to dislodge the dirt but handle with care so that the heat wheel media is not damaged

Finally, for firmly attached dirt in the rotor, use hot water and a mild detergent to remove the dirt

The mild detergent may be removed with high pressure water cleaner with the nozzle 300mm from the heat wheel

For disinfection, please use an isopropanol-based substance such as LIV +45

For Hygienic and Clean AHU plate heat exchangers, please use a brush to clean the inlets and the outlets for normal ventilation applications

Check the fan motor for any damage, cracks or detergants. If there is a dust then clean it

Check Belt drive tension of the fan and in case of it re-tighten it

Check V-Belt condition of the fan and in case of the damage replace it

Sign off on the fan maintenance