Acson international A5WCP0060A-FP, Installation Operation & Maintenance

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Issue: O-WCP15-SEP21-2 Page 24
5.5 SUPPLY AIR BLOWER ADJUSTMENT
The RPM of the supply air blower will depend on the required CFM, the unit accessories and the static resistances of
both the supply and the return air duct systems. With this information, the RPM for the supply air blower can be
determined from fan performance curves.
Knowing the required blower RPM and the blower motor horsepower, the supply air motor and pulley can be
determined. When supply air blower motor is operating, adjust the resistances in both the supply and the return duct
systems to balance the air distribution throughout the conditioned space.
The standard unit is provided with a fan outlet collar for connection of supply ductwork. It is recommended that a
straight duct having the same dimensions as the fan outlet be used. This duct should be at least 3 equivalent duct
diameters in length prior to installing any elbows or transition. See the following
Table 6 for the minimum length of
straight duct required for particular unit.
Insulate duct work that passes through unconditioned space during cooling. Insulation should include a vapor barrier
to prevent absorption of moisture.
Table 6: Minimum Straight Duct Length
Model name
Fan Supply Size
(mm) x Qty of
Blower
Duct Size (mm)
Minimum Length for
Straight Duct (mm)
A B
A5WCP0060
229x1 262 298 763
A5WCP0090
229x1 262 298 763
A5WCP0140
381x1 404 471 1191
A5WCP0180
381x1 404 471 1191
A5WCP0240
381x1
404 471
1191
A5WCP0280
457x1
478 557
1409
A5WCP0320
450x1
569 569
2026
A5WCP0360
450x1 569 569 2174
A5WCP0400
500x1
638 638
2103
A5WCP0520
500x1
638 638
2382
A5WCP0570
560x1
715 715
2272
A5WCP0710
450x2
569 569
3923
A5WCP0870
500x2
638 638
4386
A5WCP0940
500x2
638 638
4665