Johnson Controls Frick AcuAir - Operation; Unit Start-Up Overview; Initial System Start-Up; Pre-Start-Up Inspection

210.100-IOM (JUL 2021)
Page 39
AcuAir Hygienic Air Units
Operation
Operation
Start-up
Before attempting to start up and operate any electrical
cooling equipment such as an AcuAir
®
system unit, it is
essential that all personnel associated with it have a basic
knowledge of how and why the unit operates in normal
conditions. The following description outlines a standard
unit’s general features, operation, and controls.
An AcuAir
®
system (Hygienic air unit) is an engineered
heat transfer device that provides some or all of the listed
functions: cooling, dehumidication, pressurization, ltra-
tion, heating, exhaust, and condensation control. Each unit
is engineered and designed for a specic application.
Safeties and controls vary with each AcuAir
®
system in-
stallation and may be interfaced with ancillary equipment
or system controls. Thoroughly train all operators in an
integrated cooling system’s sequence of operations and
safeties.
Initial start-up
After installing the AcuAir
®
unit, controls, and necessary
ancillary and auxiliary equipment, verify the entire system
before placing the hygienic system on-line for the rst
time. Specically, the following prestart measures must be
completed to ensure the readiness of the AcuAir
®
system.
NOTICE
Do not attempt any inspection or maintenance
unless the electrical supply has been completely
disconnected and locked out.
Inspection
Do not start the unit until the following inspections verify
operational readiness. Avoid accidents or equipment fail-
ure by rectifying any unsatisfactory condition.
• Inspect the general condition of unit, for example
structural integrity, anchors and supports.
• Conrm that all conduit openings through the walls of
the AcuAir
®
unit and conduit openings into electrical
panels are sealed with electrical putty.
• Conrm the drive assembly condition and alignment of
the motor, bearings or collars, and fan or shaft.
• Conrm the correct belt condition and tension. See the
Maintenance section.
• Verify there are no obstructions at the fans and fan
guards.
• Verify the correct rotation of the fans.
• Understand and prepare for rst 24 h operation mea-
sures, for example, new belt run-in procedures. See
the New belt run-in section.
• Understand and prepare the unit prestart-up checklist.
See Prestart-up check form.
Blower, motor, drives
1. Mechanical tightness
a. Verify tightness of the fan bearing bolts.
b. Verify tightness of the blower wheels to shafts.
c. Verify tightness of the blower, motor, and sheave.
d. Verify tightness of all motor mounting bolts.
2. Belt tension
a. Adjust belt tension if slipping is evident.
b. Verify belt tension after 50 hr of operation and again
after 100 hr of operation.
New belt run-in
During initial start-up of new belts, Frick suggests per-
forming a belt run-in procedure. During start-up, follow
these instructions:
1. Listen and look for unusual noise or vibration.
2. After shutting down and locking out the starter, check
the bearings and motor. If they feel hot, the belt ten-
sion may be too tight.
3. Run the drive under full load for 24 hr of continuous
operation. Running the belts under full load allows
them to seat themselves into the grooves.
4. After running the drive, verify the tension of the belts.
Re-tension to the approrpiate values.
5. This run-in procedure reduces the future need for re-
tensioning and helps extend the life of the belts.
Filters
The AcuAir
®
unit is supplied with all lter racks in place.
The lters and lter clips are shipped separately, direct
from the lter supplier. After completely installing and
thoroughly cleaning the unit, install the prelters and nal
lters in their respective holding frames. After installing
the nal lters, clean and sanitize the nal lter section
and the supply air ductwork.
On units equipped with nal lters, a nal lter pressure
gauge is shipped mounted. The high-pressure tube is con-
nected to the gauge at the factory. The secondary port on
the gauge needs to be eld routed to the ductwork down-
stream of the nal lters using the tubing supplied.
Cooling coils
All refrigeration coils must be evacuated to remove mois-
ture before charging. Do not leave system or coils open
and idle before start-up. Internal corrosive damage can
result.
Make sure piping is correctly supported. Evaporators are
not designed to support external piping. Evaporator pip-
ing and distributor tubing is not to be used for support or
stepped on during the construction process.
The use of threading compounds at coil anges with
particles of metals, such as copper, embedded in the
compounds can cause corrosion due to contact of dissimi-
lar metals. Verify the compatibility of your construction
materials with the coil material of construction.