@DNOVA THS_R410A-IOM-1304-E
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8
Maintenance
The only operations to be performed by the user are to switch the unit On and Off.
All other operations are to be considered maintenance work and must thus be carried out by qualified personnel trained
to do their job in accordance with current laws and regulations.
8.1
Warnings
All the operations described in this chapter MUST ALWAYS BE PERFORMED BY QUALIFIED
PERSONNEL ONLY.
Before carrying out any work on the unit or accessing internal parts, make sure you have
disconnected it from the mains electricity supply.
The upper part and the outlet pipe of the compressor reach high temperatures. Be especially
careful when working in the surrounding area with the panels off.
Be especially careful when working in proximity to finned coils since the 0.11 mm thick aluminium
fins can cause superficial injuries due to cuts.
After completing maintenance jobs, always replace the panels enclosing the units and secure them
with the fastening screws provided.
8.2
Periodical checks
To guarantee a constantly satisfactory performance over time, it is advisable to carry out routine maintenance and
checks as described below. The indications below are related to standard tear and wear.
Tab. 6
Periodical checks
Operation
Frequency
Check the efficiency of all the control and safety devices.
Once a year
Check the terminals on the electric control board and compressor terminal boards to ensure that they are
securely tightened. The movable and fixed contacts of the circuit breakers must be periodically cleaned and
replaced whenever they show signs of deterioration.
Once a year
Check the refrigerant level by means of the liquid level indicator.
Every 6 mos.
Check the efficiency of the differential air pressure switch and dirty filter differential pressure switch.
Every 6 mos.
Check the condition of the air filter and replace it if necessary.
Every 6 mos.
Check the humidity indicator (
green
= dry,
yellow
= humid) on the liquid level indicator; if the indicator is not
green as shown on the indicator sticker, replace the filter.
Every 6 mos.
