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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 and hydraulic supplies to the unit before carrying out any work and
wait at least 20 mins before working on or near the heating elements.
For your safety, wear protective gloves to prevent the risk of burns from hot pipes.
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 would drop and the unit's sound level and electrical consumption would increase.
42NH is equipped with a G3 filter (optional). We recommend replacing it annually. CARRIER recommends regular
inspections of the filter's appearance in order to define the frequency with which it should be replaced, which varies
depending on the premises and the operating conditions.
The unit may be supplied without a filter at the customer's request. The customer must ensure at least G3
upstream filtration. Failure to do so will lead to loss of the motor warranty cover.
The filter should never be cleaned using water or detergent products, which could cause the spread of bacteria.
■ Accessing the filter, I, Y, H, U models:
- Suspended ceiling T2 to T5 (Fig. 10)
- Unscrew the 4 lower panels screws on the FMA side (a)
- Ensure the filter is supported as it is lowered (b)
- Perform the steps in reverse to reassemble
- "Base unit only" models without plenum or return air sleeves (T6 and T7 only) (Fig. 11)
- Mark the three G3 filter clips (a)
- Release the filter from the clips
- Models with plenum or return air sleeves (T6 and T7 only ) (Fig. 12)
- Press the two filter access bolts (a)
- Support the access panel as it is lowered and release the filter from its housing (b)
5.2 - Condensate drain pan
The main condensate drain pan and the pan extension must be kept clean. The pans and drainage fittings may be
completely cleaned using non-abrasive, water-based detergents. Also check periodically that the drain pipe is not
blocked, bent or kinked, and has the required gradient of -0°/+2° along its entire length.
Before starting up the unit, check that the water flows properly into the condensate pan by pouring some water into
it.
■ Removing the pan:
Firstly, disconnect the pump (if present) and the condensate drain.
■ Refer to the "Removal of the coil" section to remove the pan.
Note: Before starting up the unit, check that the water flows properly into the condensate pan
by pouring some water into it. If the flow is not correct, look for possible causes of the problem.
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