Maintenance & Operating Instructions; General; Casing Panels; Doors And Access Covers - Carrier AiroVision 39 HQ Assembly/Installation, Commissioning, Maintenance Manual

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12. MAINTENANCE AND OP-
ERATING
INSTRUCTIONS

12.1. General

The smooth inside and outside finish of the panels
makes maintenance very simple.
For dry sections, check inside and outside of AHU
casing thoroughly once a year. For wet sections
(cooler and humidifiers), please see relevant chap-
ters.

12.2. Casing panels

12.2.1. Inside Installation (Indoors)
a) Inspection of panel and all dry sections from in-
side.
Remove impurities by water and mild soap solution.
If finish paint is damaged, remove the rust formation
and touch up with good quality anti-corrosive primer
and paint.
Outdoor air intake sections can show signs of cor-
rosion as they contain wet parts and are affected by
mist, rain and air pollutants.
b) Inspection of coating from outside
If paint is damaged, remove rust formation and touch
up with good quality anti-corrosive primer and paint.
12.2.2. Outside Installation (Outdoors)
Check the sealed joints of AHUs installed outside
and if required seal again with a UV-resistant mate-
rial that paint can be applied. Treat damage as for
inside installation.

12.3. Doors and Access Covers

Check locks and hinges of all doors and access cov-
ers.

12.4. Flexible Connections

Check flexible connections for damage.

12.5. Earthing

Make sure unit is earthed and installed in the prop-
erly.

12.6. Dampers

All damper hinges are equipped with plastic bear-
ing bushings. Therefore, no lubrication is required.
Remove excess impurities by cleaning it with air jet.
Clean aluminium parts with water and mild soap solu-
tion.
Check screws and anchorages, re-tighten if required.
Make sure damper blades run free of the casing and
do not touch the flexible connection and duct con-
nections.

12.7. Outdoor Air Intake

Especially outdoor air intake gets contaminated by
impurities taken in with the air. Maintenance intervals
should be observed. Accumulated impurities can
lead irreparable damages on the panels. Clean the
outside air intake thoroughly and repair damages ob-
serves as described in "Inside Installation (Indoors)"
chapter.

12.8. Air Filters

The filters must be inspected once a month for ex-
cess pollution, pressure loss, damage and seating
of the slide-in filters or built-in frames. With slide-in
filters ensure that the filters have been correctly posi-
tioned and have been pushed well against each other
from below. When replacing built-in filters you must
ensure that the filter has been pushed well against
the sealant and that the clips have been correctly in-
stalled. Filters must be replaced at required intervals.
The timing of the replacement depends on the type of
filter, quality and the degree of contamination of the
air. The pressure drop across the contaminated filter
can be measured with a pressure differential gauge.
Maintenance instructions of special filters are avail-
able on request.

12.9. Heaters

12.9.1. Water, Glycol and Steam Coils
Check air intake once a year for contamination and
clean with air jet, if required, against the direction of
the air flow or clean air intake with a vacuum cleaner.
Perform leakage check. Check the operation of frost
protection thermostat and check the correct control
sequence when thermostat trips.
Glycol-charged heating and cooling exchangers
must be checked annually for the actual percentage
of glycol in the water.
The following warning is located on the panel of
steam heat exchanger: hot surface.