Frick AcuAir Manual Download

Page: 40 / 58

210.100-IOM (JUL 2018)

Page 40

ACUAIR

HYGIENIC AIR UNITS

MAINTENANCE

• Lubricate all moving part contact points and side seals.
• Inspect caulked joints between the damper frames and

the main structure – repair if the possibility of air or water
leakage exists.

FILTER MAINTENANCE

Both pre-filters and final filters should be visually inspected

at regular intervals and should be replaced when they appear
dirty or damaged. (Reference the Recommended Maintenance
Intervals chart)

The process air stream static pressure drop across the filters
will indicate the need to change the filters when compared

to the manufacturer supplied “Final” pressure drop data.
Generally these will be 1” w.g. for Koch Multi-Pleat XL8 pre-

filters and 1.5” w.g. for Koch 12” Multi-Cell final filters.

Finish and Sealing

AcuAir

units utilize a food grade caulk for air and water sealing

on the interior and exterior. The sealing on the units should
be inspected and repaired as necessary.

NOTICE

It is important that food grade sealant be used when
repairing or replacing unit caulking.

ELECTRICAL CONDUIT SEALING REQUIREMENT

The AcuAir hygienic unit has the potential to operate with
internal air humidity and external ambient temperatures
conducive to forming condensation. These factors make it
important that measures be taken to eliminate risk of water
and ice collecting where it has the potential to cause damage
or faulty operation. Before initial start-up of the AcuAir
hygienic unit a thorough inspection of all conduit openings
should be made and any compromised openings resealed.
Follow up inspections should be performed as indicated on
the recommended maintenance schedule.

Sources of Water or Ice

Water may enter the inside of the electrical conduit and
door switches by either of two methods: through unsealed

conduit ends and flexible conduit pigtails prior to the AcuAir

unit factory wiring being reconnected on site or by moisture
migrating into unsealed conduits that are open to the inside
the AcuAir enclosure. Moisture that migrates into an electrical
conduit that is then exposed to outdoor temperatures below
the dew point of the air will condense into water and drain to
the lowest location possible. If those outdoor temperatures
are cold enough this water may then turn into ice.

Remedy

In order to eliminate the collection of condensed water
inside electrical conduit, panels and instrumentation it is very
important that electrical conduit openings are adequately
sealed. Each sealed opening restricts the further migration of
moisture and the potential for water collection and damage.
The example in Figure 47 highlights the important locations
for sealing electrical conduit. This representation is not to
be considered all inclusive but rather a representation of the
typical locations requiring sealing putty.

TEMPERATURE SENSOR CALIBRATION

Temperature sensors that are out of calibration can affect both

the proper function and efficient operation of the hygienic air

unit. As part of the routine maintenance program, temperature
sensor calibration should be checked annually.

Two calibration methods are:

1. Ice Bath –
Cool a cup of water to 32°F using excess ice and agitat-

ing the water for several minutes. Immerse the tip of the
temperature sensor into the 32°F water while the AcuAir
controller channel is calibrated to 32°F.

Plug Vertically Down

Conduit Openings At

All Door Switches

Plug All Junction Box

Conduit Openings

Typical (2) Boxes

Plug All Conduit

Wall Penetrations

(Many)

Plug All Smoke Detector

Enclosure Electrical

Conduit Openings