AERMEC NYB, Installation Manual

20.05 – 4138421_03

19

MAINTENANCE

ATTENTION
Any cleaning, inspection, control, routine and extraordinary mainte-
nance must be performed by experienced, authorised personnel and 
qualified to perform the above tasks. These tasks must be performed 
with the machine off and not powered to perfection as prescribed by 
M.D. 37/2008.

During the execution of 
-   Risks of electric discharges;
-  Risk of injuries due to the presence of rotating parts;
-  Risk of injuries due to the presence of sharp edges and heavy 

weights;

-  Risks of injuries due to the presence of components containing high 

pressure gas;

-  Risks of injuries due to high or low temperature components.
-  Noise-related risks of the machine functioning (refer to what is de-

clared in the user manual);

-  Risks related to the presence of harmful substances in hydronic 

circuits.

These tasks must be performed using the appropriate personal 
protective equipment, see figure below

Maintenance operations are essential to maintain the refrigerant unit 
efficient, from a purely functional point of view and with regard to energy 
and safety. 

In the absence of specific regulations regarding HFO refrigerants, the 
manufacturer prescribes the application of and compliance with that 
indicated in the: 
-   Regulation (EC) No.842/2006- art.3 concerning the “leakage contain-

ment” 

-   Regulation (EC) No.1516/2007 concerning the “standard leakage 

checking requirements” and related national laws implementing the 
above European regulations.

ATTENTION
For the unit, the user must provide a system booklet which he must 
ensure, or its designee authorised to service the machine, will contain 
all required records in order to have a historical documentation of the 
unit functioning. The absence of records in the booklet may count as 
evidence of lack of maintenance..

PRECAUTIONS TO BE OBSERVED DURING MAINTENANCE

ATTENTION
Maintenance operations can only be performed by authorised techni-
cians 

PRECAUTIONS AGAINST RESIDUAL RISKS
MECHANICAL RISKS

-   Before opening a machine panel, ascertain whether it is or not firmly 

connected to it by hinges;

-   In case a piece is disassembled, make sure it is correctly reassembled 

before restarting the unit;

-   Louvers of the heat exchangers, edges of the components and pan-

els, screws can generate cuts;

-   Do not remove the protections from mobile elements while the unit 

is running;

-   Make sure that the protections of mobile elements are correctly in 

place before restarting the unit;

-   It is not permitted to walk or place other bodies on the machine;
-   Fans, motors and belt drives may be in motion, always wait for them 

to stop and take appropriate precautions to prevent their activation 
before accessing them;

-  Isolate the unit from the mains by means of the external isolator 

provided for the insertion of padlocks (up to 3) for blocking in “open” 
position.  

-  Place a sign reading “Do not turn on - maintenance in progress” on 

the open isolator  

-  Equip yourself with the appropriate personal protective equipment 

(helmet, insulated gloves, protective goggles, accident-prevention 
shoes, etc.)

-  Equip yourself with tools in good condition and make sure to have 

fully understood the instructions before using them  

-  For outdoor units, do not perform interventions in dangerous weath-

er conditions such as rain, snow, fog, etc.

-  The cooling circuit contains under pressure refrigerant gas: any 

operation must be performed by competent personnel in possession 
of the authorisations and qualifications required by current laws

ATTENTION
it is forbidden to LOAD the cooling circuit with a refrigerant gas differ-
ent from that indicated. Using different refrigerant gas can
severely damage the unit

-  never keep the cooling circuit open, because the oil absorbs humidi-

ty and degrades 

-  during venting protect yourself against any leakage of fluids at dan-

gerous temperatures and/or pressures 

-  always use appropriate equipment (extractor, antistatic bracelet, etc.) 

when replacing electronic boards 

-  if replacing a motor, compressor, evaporator, condensing coils or any 

other heavy element, make sure that the lifting devices are compati-
ble with the weight to be handled 

-  in air units with independent compressor compartment, do not 

access the fan compartment without having first disconnected the 
machine through the isolator on the board and having placed a sign 
reading “Do not turn on - maintenance in progress”  

-  contact the company if changes must be made to the refrigerant, 

hydraulic or electric diagram of the unit, as well as its control logic  

PREVENTION OF CHEMICAL / FIRE / ENVIRONMENTAL RISKS

-  Any intervention on the machine must be performed with “NO 

SMOKING”;

-  Never disperse the fluid contained in the cooling circuit in the envi-

ronment 

-  The water circuit may contain harmful substances. Prevent the 

contents coming into contact with skin, eyes and clothing. Use the 
prescribed personal protective equipment. (chemical risk);

-  If there is a need to perform a braze-welding, so with the use of spe-

cial torch with naked flame, the same flame must only be activated 
if in the absence of freon gas in the environment and on the cooling 
circuit pipes. Inside piping must be “washed” and contain nitrogen 
type inert gas. The presence of flame and freon gas decomposes the 
same, forming lethal and carcinogenic compounds.

-  Hot works require the availability of a Carbon Dioxide (CO

2

) fire ex-

tinguisher. DO NOT USE WATER, leachates could be hazardous for the 
discharges; if using water, provide a containment tank.  

MAINTENANCE