eXHAUst FAn FLoW LIMIt sWItCH InstALLA-
Mount the exhaust fan flow switch in the dryer exhaust duct as
1 Cut a 2" hole in the duct where the pitot tube will be located.
2 For "blind" applications, mark two of the holes using one half of
the mounting flange.
3 Reach through the 2" hole to hold the nuts in place to mount the
plate half. Use silicone sealant as a gasket. Tighten the nuts and
bolts securely. Insert the pitot approximately 12" into the duct
and hold in place.
4 Using the second half of the flange, tighten the 1/4-20 bolts to
hold the pitot in place.
– Do not fasten both halves of the flange. One side is left
unbolted for removal and cleaning of Pitot tube.
5 For other applications, weld the four duct mounting nuts to the
inside of the ductwork using the flange as a pattern.
6 Use silicone caulk as a gasket
7 Remote mount the pressure switch to a vibration and heat free
location. Connect the plastic tubing from the pitot to the switch
connecting the upstream side of the pitot to the bottom of the
switch and the downstream side of the pitot to the top side of
the switch. Wire switch per schematic
AIR FLOW DIRECTION
1 1/2 DIA.
(4) 7/16 DIA.
HOLES EQ. SPACED
ON A 3" DIA BC.
DUCT CUTDOWN DETAIL