Johnson Controls Frick AcuAir - Simple Belt Tensioning Procedure; Monthly Service Inspection; Piezometer Operation and Maintenance; Operating the Piezometer

210.100-IOM (JUL 2021)
Page 48
AcuAir Hygienic Air Units
Maintenance
Simple tensioning procedure
1. Measure the span length, K.
2. At the center of the span (K), apply a force perpendicu-
lar to the span large enough to deect the belt 1/64 in.
for every inch of span length. For example, the deec-
tion of a 100 in. span would be 100/64 or 1 9/16 in. See
the following gure.
Figure 55: Simple tensioning procedure
BELT
DEFLECTION
1/64" PER
INCH OF
SPAN
K
SPAN
FORCE
Operating and maintenance
instructions for piezometer
CAUTION
Do not perform maintenance on the piezometer
when the fan is rotating.
Operating the piezometer
The Piezometer has no moving parts; it cannot be turned
on or off or adjusted. The ring on the exterior side of the
blower inlet cone and the upstream static pressure port
are tted with a 0.25 union brass tee. The tees are the
connection points for running pneumatic tubing from the
Piezometer to an air pressure gauge.
This Piezometer automatically produces a pressure differ-
ential signal whenever the fan is moving air. See Figure 56.
Maintaining the piezometer
Basic piezometer maintenance requires keeping the ve
tiny pressure pickup holes, in the inlet panel face and
the throat of the inlet cone, free from blockage or debris
buildup. Annually check the tubing and ttings attached
outside the Piezometer for wear or damage.
In addition, it may become necessary to back-ush each
line gently with compressed air. This helps to blowout
debris from inside the line and pressure pickup holes. It is
important and necessary to keep the inside surface of the
cone clean; especially in a 1 in. radius immediately around
the pressure pickup holes.
In the unlikely event that the pneumatic tubing on the
piezometer is damaged, simply remove the damaged sec-
tion and replace with a comparable type of tubing.
NOTICE
Pressure differential on tubing is less than 1 psig.
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 the throat of the inlet cone
and one on the upstream face. Elimination of one of the
throat holes does not adversely affect the performance of
most Piezometer. However, obstructing the upstream face
hole completely nullies its performance.
Figure 56: Plenum fan tap location and connection
CONNECT TO HIGH PRESSURE SIDE
CONNECT TO LOW PRESSURE SIDE
NOTICE
For help with setup and calibration of Piezometers and
Transducers, contact Johnson Controls-Frick AcuAir
®
service at 717-762-2121.
Monthly service
Along with daily logs and weekly inspections, Johnson
Controls-Frick suggests that the unit undergo a thorough
monthly inspection. The monthly inspection must include
but not limited to the following areas as indicated in
Table 14 and following information:
Blowers, motors, and drives
1. Shut down the unit, and disconnect all electrical power.
Touch all of the blower bearings. Ensure the bearings
are slightly warmer than the air passing over them, and
that they are all be approximately the same tempera-
ture. If any of the bearings are noticeably warmer than
the other bearings, or if any of the bearings are too hot
to touch, apply grease using the grease tting. Grease
the bearings in accordance with the included Blower
Bearing Lubrication guidelines.
2. Verify the tightness of the blower bearing bolts, the
blower, motor, and pulleys, and the motor mounting
bolts.