The Piezometer has no moving parts; it cannot be turned on
or off or adjusted. Each of the two rings on the exterior side
of the inlet cone are tted with a 0.25 union brass tee. The
two tees are the connection points for running pneumatic
tubing from the Piezometer to an air pressure gauge. This
Piezometer will automatically produce a pressure differential
signal whenever the fan is moving air. (Figure 56)
Basic Piezometer maintenance requires keeping the eight tiny
pressure pickup holes, in the ange and throat of the inlet
cone, free from blockage or debris buildup and periodically
checking the tubing and fittings attached outside the
Piezometer for wear or damage.
In addition, periodically back-ushing each line gently with
compressed air may help to blowout debris in the line and
pressure pickup holes. It is important and necessary to keep
the inside surface of the cone clean; especially in a one-inch
radius immediately around the pressure pickup holes.
In the unlikely event that the pneumatic tubing on the
Piezometer is damaged, simply remove the damaged section
and replace with a comparable type of tubing.
In the unlikely event that one of the brass ttings which is
sweated to the Piezometer breaks loose from the Piezometer,
simply remove that tting and replace it with a straight
coupling tting of similar construction. Do not attempt to
resolder the tting to the Piezometer.
There are four pickup holes on each piezometer ring.
Elimination of one of them will not adversely affect the
performance of most Piezometer.
CONNECT TO HIGH PRESSURE SIDE
CONNECT TO LOW PRESSURE SIDE
Johnson Controls-Frick recommends that the unit undergo a
thorough monthly inspection. The inspection should include,
but not limited to, the following areas:
a. Shut down the unit , and disconnect all electrical power.
Touch all of the blower bearings. The bearings should
be slightly warmer than the air passing over them, and
they should all be approximately the same temperature.
If any of the bearings are noticeably warmer than the
other bearings, or if any of the bearings are too hot to
touch, grease should be applied via the grease tting.
The bearings should be greased in accordance with the
included Blower Bearing Lubrication Guidelines.
b. Verify the tightness of the blower bearing bolts, the
blower, motor, and pulleys, and the motor mounting
bolts.
c. Inspect the blower belt tension. The belts should be
tensioned in accordance with the included Blower Belt
Tension Guidelines. Visually inspect the belts for indica-
tions of wear. Replace the belts if there is evidence of
cracking, fraying, or uneven wear.
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