Mounting and Wiring VMA1200 Series Controllers Technical Bulletin
13
4.
Tighten the set screw to the shaft using a 8 mm (5/16 in.) wrench
or 10 mm (3/8 in.) 12 point socket wrench. Tighten to
17 to 21 N
⋅
m (150 to 180 lb
⋅
in [14 lb
⋅
ft]).
Default configuration for the VMA is 90
°
rotation in 90 seconds.
Adjust the Damper Time configuration property for 45 seconds
when using a 45
°
box.
5.
Push the gear release lever down, and turn the VMA coupler by
hand to ensure that the damper can rotate from full closed to full
open positions without binding.
6.
Plug or seal the end of a hollow damper shaft to stop cold duct air
from affecting the circuitry when the VMA is mounted in another
enclosure.
7.
Attach the pneumatic tubing to the pressure sensor with the
HI (red) tubing connected to the inlet or high pressure side, and
clear tubing connected to the low pressure side.
8.
Route the tubing as shown below, or tape a loop in the tubing.
This provides a low spot for collecting condensation.
Low Spot for
Collecting Condensation
Stdmount
Figure 7: Standard Mounting