Riello NUOVO ACU Series Technical Information Assembly, Use And Maintenance Instructions page 50

CHECKING THERE IS NO AIR IN THE WATER CIRCUIT
Loosen the manual bleed valves and check that there is no air.
Checking voltage
Using a voltmeter check that the power supply is as indicated on the technical data plaque (tolerance 
10%).
Checking absorption
Using an ammeter check that the electrical current of each phase is less than that indicated on the technical
data plaque.
Checking electrical connections
Disassemble the electrical connections box and check that all the terminal grips are tightened properly.
Checking condition of WATER couplings
Check for leaks along the entire circuit.
Checking the pressure of the system
Regularly check the pressure of the system, so as to allow the unit to operate in optimal conditions.
Do not exceed the maximum working pressure limit indicated in chapter TECHNICAL DATA.
CLEANING THE EXTERNAL PANELS
This cleaning should only be carried out with damp cloths with soap and water. For stubborn stains, moisten
the cloth with a mixture of 50% water and 50% denaturated alcohol or specific products. After cleaning, dry
the surfaces carefully.
Do not use sponges soaked in abrasive products or powder detergents.
Cleaning the helical fan
Remove any dust and/or foreign objects that may have deposited on the fan and/or grating with
compressed air.
Cleaning the air-water heat exchanger
Remove the air outflow grating. Then clean off any dust that may have deposited on the exchanger fins with
the aid of compressed air.
50