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Unfortunately, this mechanical advantage also works in
reverse by multiplying the pressure on the disk into a much great pressure on
the element shaft. Thus a small fluctuation in system pressure can cause a large fluctuation in
the temperature set point of the thermal element. The net effect on room
temperature control is temperature resetting, varying differential, and varying
hyteresis.
The VFS-24, with its sleeve damper design, assures the system
designer of the full 70 to 78 degree operating range of the diffuser regardless
of system pressure variations or damper position.
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