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Air conditioning equipment must be maintained by profes-sional
technicians, whilst routine checks can be carried out locally by
specialised technicians. See the standard EN 378-4.

Simple preventive maintenance will allow you to get the best
performance from your HVAC unit:

Improved cooling performance

Reduced power consumption

Prevention of accidental component failure

Prevention of major time-consuming and costly inter-

ventions

Protection of the environment.

There are five maintenance levels for HVAC units, as defined by

the AFNOR X60-010 standard.

13.1 - Level 1 maintenance

See note “Any deviation or non-observation ...” in chapter 13.3 -
“Level 3 (or higher) maintenance”. Simple procedure can be carried
out by the user:

Visual inspection for oil traces (sign of a refrigerant leak)

Air heat exchanger (condenser) cleaning - see chapter
13.6.1 - “Level 1”.

Check for removed protection devices, and badly closed
doors/covers

Check the unit alarm report when the unit does not work.
Refer to the 30XB/30XAS/30XW Touch Pilot control
manual for a more detailed explanation.

General visual inspection for any signs of deterioration.

13.2 - Level 2 maintenance

See note “Any deviation or non-observation ...” in the ext column.

This level requires specific know-how in the electrical, hydraulic
and mechanical fields. It is possible that these skills are available

locally: Existence of a maintenance service, industrial site,
specialised subcontractor. In these cases, the following
maintenance operations are recommended.

Carry out all level 1 operations, then:

At least once a year tighten the power circuit electrical
connections (see table 13.4).

Check and re-tighten all control/command connections,
if required (see table 13.4).

Check the differential switches for correct operation every
6 months (free-cooling option 118A).

Remove the dust and clean the interior of the control
boxes, if required.

Check the presence and the condition of the electrical
protection devices.

Check the correct operation of all heaters.

Replace the fuses every 3 years or every 15000 hours
(age-hardening).

Replace the control box cooling fans used with option 22

(with designation EF22_) every five years.

Check the height of the anti-vibration mountings (located
between the compressor rails and the unit chassis) after
5 years of operation, and then each year. When the total
minimum height of the mountings is less than 25 mm
replace the mountings.

Check the water connections.

Purge the water circuit.

Clean the water filter.

Fully clean the condensers with a low-pressure jet and a

bio-degradable cleaner (counter-current cleaning - see
chapter 13.6.2 - “Level 2”).

Replace the stuffing box packing of the pump after 10000

hours of operation.

Check the unit operating parameters and compare them
with previous values.

Keep and maintain a maintenance sheet, attached to
each HVAC unit.

Check the correct operation of the capacitor (power factor
correction option 231).

All these operations require strict observation of adequate safety
measures: Individual protection garments, compliance with all
industry regulations, compliance with applicable local regulations
and using common sense.

13.3 - Level 3 (or higher) maintenance

NOTE: Any deviation or non-observation of these mainte-nance

criteria will render the guarantee conditions for the HVAC unit

null and void, and the manufacturer, Carrier SCS will no longer

be held responsible.

The maintenance at this level requires specific skills/approval/

tools and know-how and only the manufacturer, his representative
or authorised agent are permitted to carry out these operations.
These maintenance operations concern for example:

A major component replacement (compressor, evapo-

rator)

Any intervention on the refrigerant circuit (handling
refrigerant)

Changing of parameters set at the factory (application
change)

Removal or dismantling of the HVAC unit

Any intervention due to a missed established mainte-
nance operation

Any intervention covered by the warranty.

13.4 - Tightening torques for the main electrical

connections

13.4.1 - Tightening torques for the main electrical connections

Screw type

Use