Servicing And Maintenance; Air Filter - Carrier 42KY Installation, Operation And Maintenance Instructions

- Complete cassette unit (with electrical heaters) equipped with an EC motor (brushless technology): maximum leakage current
= 4.5 mA.
Electromagnetic compatibility in accordance with Emission Standard 61000-6-3 (EN55014-1, Tool class) and Immunity
61000-6-1 (Residential, commercial and light industry class).
Important: The unit's compliance with the above standards does not guarantee the compliance of the installation as a whole (several
other factors not relating to the unit may be involved). As a result, the installer must observe the applicable recommendations in order
to guarantee compliance.
General safety instructions for units with electrical heaters:
- The rotation speed of the EC motor must never be below 400 rpm.
- The operation of the heating coil must be fan-controlled.
- Power to the electrical heaters should be cut whenever the fan motor assembly is stopped intentionally or unintentionally.
- When the system is completely shut down, ensure that the controls provide at least 2 minutes over-run of the fan to dissipate
any residual heat in the electric heater.
- Units equipped with heaters are protected against accidental overheating by 2 temperature limiting thermostats (Fig. 15), one
with manual reset (a) and one with automatic reset (b).
Do not reset these thermostats until the potential causes of the overheating have been checked:
→ Fan failure.
→ Filter partially clogged
→ Coil and fan stopped simultaneously by the control.

5. SERVICING AND MAINTENANCE

The unit must be serviced periodically between the heating and cooling seasons. In particular, components prone to clogging
(filter, condensate drain pan, coil, etc.) must be checked.
Disconnect the electrical supply to the unit before carrying out any work. The unit must also be isolated from the hydraulic
circuit(s).

5.1. Air filter:

The filter is crucial to the correct operation of the unit. Without it the heat exchange coil would become clogged, the performance
drop and the unit's sound level rise.
Our device is equipped with a G3 filter.
We recommend regular visual inspection of the filter in order to define the frequency with which it should be replaced, which
varies depending on the premises and the operating conditions (replace at least once a year). If maintenance is carried out more
frequently, the filter can be cleaned with a vacuum cleaner (vacuum in the opposite direction to the normal airflow). The above
recommendations are for information only.
Using a different type of filtration system could compromise the performance of the unit and be detrimental to users.
 Accessing the filter:
- Identify the two retaining lugs (Fig. 16, a) positioned on the perforated return air grille
- Push the two lugs to release the return air grille.
- Lower the hinge-mounted return air grille until it is at right angles to the diffuser.
- Release the filter from its housing.
- After fitting a new filter, refit the return air grille. Lock it to the panel by simultaneously pushing the two lugs sharply upwards.
- Check that the grille is securely affixed.
Note: the micro perforated return air grille must never be pushed in beyond the discharge panel
EN - 7
EN