Frick AcuAir, Manual, Page: 39 / 58

210.100-IOM (JUL 2018)
Page 39
ACUAIR
®
HYGIENIC AIR UNITS
MAINTENANCE
MAINTENANCE
DAILY OPERATION AND ROUTINE MAINTENANCE
The AcuAir unit should be inspected, cleaned, and lubricated
on a periodic basis. The required services and recommended
frequency for the various components are summarized in the
Operation and Maintenance Schedule in this manual.
A daily AcuAir system operations log is a good method to
assure that no problems develop that may go unchecked.
Entries to this log should be made during each shift. Any
notations should be entered as they occur (or as internal policy
dictates). It is essential that the maintenance manager examine
all notations (from the previous 24 hours) on a daily basis.
As weather and safety allow, a visual check of the AcuAir
unit should be made once each shift (daily at a minimum) to
examine operating conditions. Unusual leaks, noise, vibration,
part damage/failures, or vandalism should be logged and
investigated immediately. Corrective action should be initiated
immediately.
Components of the AcuAir unit should also be part of the daily
operational checks conducted of the equipment on site. In
particular, filtration performance is important for satisfactory
and problem-free AcuAir hygienic system operation.
The Recommended Maintenance Intervals schedule included in
the later part of this IOM section should be used to develop the
site specific hygienic air unit inspection log and maintenance
schedule.
COIL MAINTENANCE
An AcuAir air unit's operational readiness is dependent on
the condition of the fin-coil heat exchanger(s). Coils that
are dirty, blocked from airflow, or physically damaged may
affect overall heat transfer capability of the AcuAir system to
a significant degree.
Regular visual inspections should be made of both the inlet and
leaving sides of the cooling coil(s) as well as the refrigerant
pipe connections. These inspections should occur at least as
frequently as indicated in the maintenance schedule in this
IOM. Remove any airborne debris that may have collected
on the face of the fin coils. If site conditions require coil
cleaning measures following each of the recommended routine
inspections it may be necessary to increase the frequency of
the inspections.
A typical refrigerated food processing facility has stainless steel
food contact surfaces and clean work spaces. Evaporators
trap airborne contaminants and corrosive elements in the
coils.
Dirty coils are also unsanitary. They must be cleaned
regularly with simple, gentle, wash and rinse procedures.
Refrigerant could leak into the process airstream and come
in contact with food products and personnel. As such, proper
maintenance of refrigerant coils is essential to prevent
corrosion and leaks that result in product loss and to ensure
the safety of plant personnel.
For all coils, chlorine-based cleansing solutions, acidic
cleansing solutions and highly alkaline cleansing solutions are
hazardous to the coil's integrity. Use a mildly alkaline cleanser.
Consult with your chemical supplier and read the Material
Safety Data Sheet for your cleansing solution.
NOTICE
Air units move air (and airborne contaminants) across
the coil. Protect the coil from corrosion by washing and
rinsing frequently.
The water used to wash the coils should be analyzed prior to
use to determine its suitability. It should not contain dissolved
chemicals or organisms. Contact a specialist to test the water,
then follow his recommendations. Establish and follow a
regular testing and treatment schedule.
Further need for cleaning or repair of an AcuAir
®
system coil
should be left to the judgement of a certified or factory-trained
service person. Contact the local AcuAir
®
representative if
a coil or its connections appears to have been significantly
damaged.
Do not allow ice buildup. If a coil remains partially frosted
after a defrost, it is unlikely to ever completely remove
accumulated frost and ice in a subsequent defrost. If a coil
is allowed to build ice into a solid block, the ice can cause
stresses to develop which are capable of crushing or rupturing
coil tubes and piping.
CAUTION
NEVER take shortcuts to clear ice from a coil by applying
an open flame to melt ice or frost.
DAMPER MAINTENANCE
1. General Maintenance – Dampers require proper
maintenance in order to function correctly. Blade shafts,
linkages, stainless steel side seals (if applicable) and other
moving parts should be cleaned and lubricated as indicated
in the Recommended Maintenance Interval schedule in this
manual.
A light molybdenum oil in aerosol cans is preferable since the
jet nozzle permits pinpointing the stream of lubricant where
required. It usually contains an evaporating solvent and dries
to a non-oily film, which will not attract dirt. For dampers
located in difficult or impossible to reach locations, field access
panels/doors are required as installed by others.
2. Periodic Inspections
– All automatic dampers should
be checked and serviced on a regular schedule. The AcuAir
recommended interval is monthly and should never exceed
three months. Malfunctioning dampers can lead to improper
control of space temperatures, excessive infiltration, and
increased energy costs.
3. Inspection Checklist
– At a minimum, include the following
items in scheduled inspections:
• Observe damper motors and actuators through an operating
cycle to check for defects and binding. Inspect mounting
bolts for integrity.
• Adjust actuator linkages so those dampers open and close
fully for given stroke.
• Verify tightness of closed blades – readjust linkage for any
blades that may not close fully.
• Replace any damaged blades – clean operating parts.
• Inspect blade edge and side seal – replace as necessary.
• Inspect pins, straps, bushings, etc., for wear and replace
as required.