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BCXC-SVX01B-EN 65
Maintenance
NOTICE
Belt tension!
Do not over-tension belts. Excessive belt tension will reduce fan and motor bearing life,
accelerate belt wear, and could result in shaft failure.
Table 32. BCHC/BCVC fan, filter, and mixing box general data
Unit size 12 18 24 36 54 72 90
Nominal cfm 400 600 800 1200 1800 2400 3000
Air flow
Minimum cfm 250 375 500 750 1125 1500 1875
Maximum cfm 500 675 1000 1600 2400 3000 4000
Fan data
Fan wheel, in. (dia. x width) 9.5 x 4.5 9.5 x 4.5 9.5 x 9.5 9.5 x 9.5 12.6 x 9.5 12.6 x 9.5 12.6 x 9.5
Maximum rpm 2300 2300 1800 1800 1500 1500 1500
Motor hp 0.33–1.0 0.33–1.0 0.33–1.0 0.33–1.5 0.33–2.0 0.33–3.0 0.33–3.0
Unit flat filter
Qty. - size, in. 1 - 12 x 24 1 - 12 x 24 1 - 16 x 25 2 - 16 x 20 2 - 20 x 20 1 - 20 x 20 3 - 16 x 25
1 - 20 x 25
Area, sq. ft 2.000 2.000 2.778 4.444 5.556 6.250 8.333
Velocity, ft/min. 200 300 288 270 324 384 360
Angle filter
Qty. - size, in. 2 - 12 x 24 2 - 12 x 24 2 - 12 x 24 2 - 20 x 20 4 - 16 x 20 4 - 16 x 20 4 - 20 x 20
Area, sq. ft 4.000 4.000 4.000 5.556 8.889 8.889 11.111
Velocity, ft/min. 100 150 200 216 203 270 270
Bottom / top access filter box
Qty. - size, in. 1 - 12 x 20 1 - 12 x 24 1 - 16 x 25 1 - 16 x 20 1 - 16 x 20 1 - 20 x 25 2 - 16 x 25
1 - 16 x 16 1 - 20 x 20 1 - 20 x 20 1 - 14 x 25
Area, sq. ft 1.700 2.000 2.800 4.000 5.000 6.300 8.000
Velocity, ft/min. 240 300 288 300 360 384 375
Mixing box
Damper opening width, in. 15.5 19.5 19.5 31.5 31.5 31.5 31.5
Damper opening height, in. 7 7 7 7 12.75 12.75 12.75
Area, sq. ft 0.753 0.948 0.948 1.531 2.789 2.789 2.789
Velocity, ft/min. 531 633 844 784 645 861 1076
Note: Minimum air flow limits apply to units with hot water or electric heat only. There is no minimum airflow limit on cooling
on units. Maximum airflow limits are to help prevent moisture carryover.
Table 33. BCBH/BCVC valve package waterflow limits
Tube size (in.) gpm
1/2 8.6
3/4 19.3
1 34.3
1-1/4 53.5