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Exhaust Fan Flow Limit Switch Installation - Honeywell BCS 3600 Operating Instructions Manual

Burner control system.
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eXHAUst FAn FLoW LIMIt sWItCH InstALLA-
tIon
Mount the exhaust fan flow switch in the dryer exhaust duct as
shown below.
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.
BAG HOUSE
WARnInG
– 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
UPSTREAM
DOWNSTREAM
12"
STACK
1 1/2 DIA.
(4) 7/16 DIA.
HOLE
HOLES EQ. SPACED
ON A 3" DIA BC.
45°
DUCT CUTDOWN DETAIL
FOR SWITCH
ASSEMBLY MOUNTING
9
DOWNSTREAM
PRESSURE
CONNECTION
UPSTREAM
PRESSURE
CONNECTION

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