D
–EIMAC01905-23_00EN - 24/53
4
MECHANICAL INSTALLATION
4.1
Safety
The unit must be firmly secured to the soil.
It is essential to observe the following instructions:
−
The unit can only be lifted using the lifting points marked in yellow fixed to its base.
−
It is forbidden to access the electrical components without having opened the unit main switch and switched off the
power supply.
−
It is forbidden to access the electrical components without using an insulating platform. Do not access the electrical
components if water and/or moisture are present.
−
Sharp edges and the surface of the condenser section could cause injury. Avoid direct contact and use adeguate
protection device
−
Switch off power supply, by opening the main switch, before servicing the cooling fans and/or compressors. Failure to
observe this rule could result in serious personal injury.
−
Do not introduce solid objects into the water pipes while the unit is connected to the system.
−
A mechanical filter must be installed on the water pipe connected to the heat exchanger inlet.
−
The unit is supplied with safety valves, that are installed both on the high -pressure and on the low-pressure sides of
the refrigerant circuit.
It is absolutely forbidden to remove all protections of moving parts.
In case of sudden stop of the unit, follow the instructions on the
Control Panel Operating Manual
which is part of the
onboard documentation delivered to the end user.
- It is strongly recommended to perform installation and maintenance with other people.
Avoid installing the chiller in areas that could be dangerous during maintenance operations, such
as platforms without parapets or railings or areas not complying with the clearance requirements
around the chiller
DAE units can be installed without charge restrictions into machinery rooms or in open air (location class.III).
According to EN 378-1, a mechanical vent on the secondary circuit(s) has to be installed: to ensure location classification
III the system shal
l be classified as an “indirect vented closed system”.
Fig. 18 - Indirect vented closed system
Key
1)
Occupied Space
2)
Refrigerant containing part(s)
Machinery rooms shall not be considered occupied space (except as defined in part 3, 5.1: machinery room used as a
maintenance workspace shall be considered occupied spaces under access category c).
Each exchanger (evaporator and condenser) is provided with a safety valve installed on a changeover valve that allows
maintenance and periodic checks, without losing a significant amount of refrigerant. Do not leave the safety valve in the
intermediate position.
To prevent damages due to inhalation and direct contact with refrigerant gas, the safety valve outlets must be conne cted
with a conveyor pipe before operations. These pipes must be installed so that, in case the valve opens, the discharged
refrigerant flow not invest people and/or things, or can enter the building through windows and/or other openings.
The installer is responsible for connecting the safety valve to the purge pipe and pipe dimensioning. In this regard, refer to
the harmonized standard EN13136 to dimension the drain pipes to be connected to the safety valves.
All precautions concerning handling of refrigerant must be observed in accordance with local regulations.
Safety devices
In accordance with the Pressure Equipment Directive the following protection devices are used:
-
High pressure switch
→
safety accessory.
-
External relief valve (refrigerant side)
→
over pressure protection.
-
External relief valve (heat transfer fluid side)
→
The selection of these relief valves must be made by the
personnel responsible for completing the hydraulic circuit(s).