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Installation
RT-SVX19A-E416
To increase airflow
Loosen variable sheave set screw
and turn sheave clockwise.
To decrease airflow
Loosen variable sheave set screw
and turn sheave counter-clockwise.
To increase belt tension
Loosen the nut (next to the idler
sheave) that secures the sheave in
place. With a wrench, apply
pressure clockwise on the outside
nut (round headed one), until
tension desired is reached. While
holding pressure with the tension
nut, retighten the nut next to the
idler sheave.
Figure 9 - Typical fan, motor, and sheave
assembly
A = Fan Housing
B = Terminal Block
C = Fan Sheave
D = Plastic Bushing
E = Belt Tension Adjustment Bolt
F = Idler Pulley
Table 6b - Belt tensioning
TK* / YK* /
WK*
Motor kW
Fan pulley
Type /
diam. (mm)
Fan pulley
Type /
diam. (mm)
Belt type
/ lengh (mm)
Belt
deflexion
(mm)
Deflexion
effort
mini kg
Deflexion
effort
maxi kg
Belt tension
mini
N
Belt tension
maxi
N
125 1,5 BK90 / 222 1VP44 / 105 BX68 / 1727 5,89 2,4 2,9 400 500
155 1,5 BK85 / 210 1VP44 / 105 BX68 / 1727 6 2,4 2,9 400 500
175 3 BK130 / 324 1VP44 / 105 BX75 / 1905 6,05 2,4 2,9 400 500
200 3 BK160 / 400 1VL40 / 95 BX90 / 2286 6,96 2,4 2,9 400 500
250 4,6 BK190 / 476 1VP50 / 121 BX96 / 2438 6,91 2,4 2,9 400 500
125 3 BK130 / 324 1VP44 / 105 BX75 / 1905 5,85 2,4 2,9 400 500
155 3 BK140 / 349 1VP44 / 105 BX77 / 1955 6,17 2,4 2,9 400 500
175 4,6 BK140 / 349 1VP56 / 136 BX75 / 1905 5,45 2,4 2,9 400 500
200 4,6 BK190 / 476 1VP56 / 136 BX96 / 2438 6,87 2,4 2,9 400 500
250 4,6 BK190 / 476 1VP56 / 136 BX96 / 2438 6,32 2,4 2,9 400 500