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GENERAL INFORMATION
2.5 TECHNICAL SPECIFICATION
2.5.1 Construction
•
The frame is a galvanised steel body and external cabinets are marine grade aluminium.
•
Units have Black Magic
2.5.2 Blower
•
The standard blower is forward curved and constructed from steel. Units not installed in ductwork are typically
optioned with an axial fan due to the low pressure drop.
•
Blower housings are powder coated steel as standard.
2.5.3 Fan Motors
•
Fan motors are mounted externally to the blower and connect via a set of pulleys.
•
All units are available at order with 2 different motor power capacity to meet flow and pressure requirements. Units
may be fitted with a larger motor at additional cost. Contact Seeley international for further advice.
•
Axial fans are specified for the F configuration and designed to be installed indoors generally as an air curtain.
2.5.4 Pulleys
•
Upon order the customer will be given the options of one of three pulley kits to meet their flow and pressure
requirements.
•
Variations in external pressure drop outside of the standard product range require pulley and belt combinations to
be supplied by the customer.
•
All pulleys are of steel construction with taper lock mounting.
2.5.5 Electrical Control and Connection
•
All units have an electrical starter box housed inside the unit.
•
Refer to Appendix A for wiring diagrams.
•
Units may be controlled by Wall Switch or BMS.
•
Units will require single or 3 phase power depending on required motor size.
2.5.6 Supply Water Specification
Water consumption rates vary with weather conditions but the following can be used as a guide. The evaporative cooler
can evaporate around 2.5L of water per hour for every 100L/s of supply air. So a large cooler providing 14,000L/s of
air could evaporate 2.5 x 140 = 350L of water per hour of operation. The water bleed off rate must be added to this in
order to calculate the total operating water flow rate.
2.5.7 Relief Area Calculation
Evaporative air coolers always run on 100 % fresh outside air. Always ensure adequate relief is available via open
doors and/or windows. Allow approximately 0.4m² per 1000L/s of supply air. If 0.5mm fly wire screens are fitted to the
relief area, allow 0.8m² per 1000L/s for this area. Contact manufacturer if other fly wire thicknesses are installed.
Example:
AL30 – 7.5kW Cooler with 200Pa pressure drop
Air delivery will be approximately 11,890 L/s (refer spec sheet)
If no fly screens are fitted to relief openings:
0.4 m
x (11890 L/s / 1000 L/s) = 4.8m
2
If fly screens are fitted to 70% of the relief openings:
[(0.8 m
x 70%) + (0.4 m
2
Select relief openings to provide the best pattern of cool air flow throughout the building. Note that relief openings
may be ineffective if exposed to high winds. If air exhaust volume is a problem, mechanical exhaust ventilation will be
required for as much as 80% of the air delivery of the cooler.
Coolers must not discharge into a closed space but must always be able to relieve from a building.
If Supply air ducts are fitted with adjustable outlet grill blades, the blades should be adjusted to give the best cool air
distribution in the area served by the outlet. Do not close blades too far or air whistle may occur.
To ensure long life and efficient operation it is essential that the cooler receive an annual service. In extreme
environments (e.g. hot dusty areas) more frequent service may be required. Check with the unit installer.
During normal operation of the cooler it is important that the water bleed-off is operating and is not shut off or blocked.
This bleed-off will prevent an accumulation of salts and solids in the unit.
Mini-Cell Chillcel
cooling pads.
TM
®
x 30%)] (11890 L/s / 1000 L/s) = 8.1 m
2
relief area required
2
AL SERIES INSTALL OPERATION MAINTENANCE MANUAL |
relief area required (minimum)
2
7
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