Carrier 39E Operations Instructions download pdf (Page 15)

6 - MAINTENANCE AND OPERATING INSTRUCTIONS

6.1 - General

The AHU(s) require little maintenance. The smooth inside

and outside finish of the panels makes maintenance very

simple.

For dry sections: once a year thoroughly check the inside

and outside of the AHU casing. For maintenance of wet

sections (coolers and humidifiers) please refer to the air

handling section concerned.

6.2 - CASING PANELS

6.2.1 - Inside installation

a) Internal inspection of the casing of double-skin panels

and of all dry parts..

Remove contamination with water and a mild household

soap solution. Where damage of the paint finish has

occurred, if necessary remove rust and touch up with good

quality anti-corrosive primer and paint. The outside air

intake sections can show signs of corrosion as they contain

wet parts and are affected by mist, rain and air pollutants.

b) Outside inspection of the coating.

If damage to the paint treatment has occurred, remove the

rust (if necessary), and touch up with good quality anti-

corrosive primer and paint.

6.2.2 - Outside installation

Check the sealed joints of AHUs installed outside and if

required seal again with a UV-resistant and paintable kit.

Treat damage as for inside installation.

6.3 - Doors and access covers

Check locks and hinges of all doors and access covers. For

outside installation check the storm cord.

6.4 - Flexible connections

Check the flexible connections for damage.

6.5 - Earthing

Ensure that the unit is earthed and installed in the correct

manner.

6.6 - Dampers

All damper hinges are equipped with plastic bearing

bushings, so that no lubrication is required. Remove excess

contamination by cleaning it with compressed air. Clean

aluminium parts with water and a mild household soap

solution. Check adjusting bolts and linkage and if necessary

tighten. Ensure that the damper blades run free of the

casing and do not touch the flexible connection.

6.7 - Outside air intake

Especially the outside air intake is contaminated by pollution

taken in with the air. The maintenance interval must be

observed, as irreparable damage of the panels might

otherwise occur. Clean the outside air intake well and repair

damage as described in point 6.2.1.

6.8 - Filters

The filters must be inspected once a month for excess

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 positioned 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

installed. Filters must be replaced at the required intervals.

The timing of the replacement depends on the type of filter,

quality and the degree of contamination of the air. The

pressure loss across the contaminated filter can be measured

with a pressure differential gauge. Maintenance instructions

of special filters are available on request.

6.9 - HEATERS

6.9.1 - Water, glycol and steam heat exchangers

Check the air intake once a year for contamination, and if

necessary clean with compressed air against the direction of

the air flow or clean the air intake with a vacuum cleaner.

Check for leakage. Check the operation of the frost

protection thermostat and check the correct control

sequence when the themostat trips. Glycol-charged heat

exchangers must be checked annually for the actual

percentage of glycol in the water.

The following warning pictogram is located on the panel of

the steam heat exchanger: hot surface.

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Carrier 39E Operations Instructions Page 15

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