52
VTS reserves the right to implement changes without prior notice
Ventus Air Handling Units
Table 17. Specification of „Siemens” motors' bearings - fans with intermediate drive
Mechanical motor's size
Bearing at the drive side
Bearing at the motor's back
71
6002-2Z-C3
6002-2Z-C3
80
6004-2Z-C3
6004-2Z-C3
90
6205-2Z-C3
6004-2Z-C3
100
6206-2Z-C3
6205-2Z-C3
112
6206-2Z-C3
6205-2Z-C3
132
6208-2Z-C3
6208-2Z-C3
160
6209-2Z-C3
6209-2Z-C3
180
6210-Z-C3
6210-Z-C3
200
6212-Z-C3
6212-Z-C3
225
6213-Z-C3
6213-Z-C3
250
6215-Z-C3
6215-Z-C3
Table 18. Specification of motors bearings „VTS”- fans with direct drive
Mechanical motor's size
Bearing at the drive side
Bearing at the motor's back
71
6202-ZZ-C3
6202-ZZ-C3
80
6204ZZ-C3
6204ZZ-C3
90
6205ZZ-C3
6205ZZ-C3
100
6206ZZ-C3
6206ZZ-C3
112
6206ZZ-C3
6206ZZ-C3
132
6208-ZZ-C3
6208-ZZ-C3
160
6309-C3
6309-C3
For EC motors are used bearings type: 6202 ZZ C3E
7.5.3 Belt transmission
During operation activities of the fan unit you have to check tension of wedge-shaped belts and their
parallel alignment. Factory-set belts tension should be checked after first 50 working hours and then
carry out regular adjustment every 4 months. Too loose belt can fall off the pulley or slide on it and in
turn may wear out quickly, but on the other hand too tight belt may result in bearing overheating and
damage as well as motor's overload.
Tension check should be carried out in the following way:
1. Measure a distance between wheels' axes (A size. fig.24).
2. Measure power P needed in order to bend the belt by S=16 mm for each running meter of a
distance between the axes, more or less in halfway between the axes (fig.24).
3. Increase the belt tension if the power has got a smaller value or decrease - if the power has got
bigger value than the one shown in the table.
4. Recommended belt tension is equal to 0.8 x Pmax
In case of incorrect belts tension, stretch them by moving the motor with a stretching screw located
in the motor panel (fig.26), and compare tension values with the values shown in the table 18
Fig.24 Deflection of a wedge-shaped belt
