LCP
RG66006889-Rev.01
17
A
standard
feature of LCP units is a device for controlling the flow rate (vane operated
flow switch) in the water circuit in the immediate vicinity of the evaporator.
Any tampering with said device will immediately invalidate the warranty.
It is compulsory to install a metal filter with a mesh smaller less 1mm on the inlet water
pipe.
It is strongly recommended to install a safety valve in the water circuit. In the event of
serious equipment faults (e.g. fire) it will enable water to be drained from the system,
thereby preventing possible bursts. Always connect the drain outlet to a pipe with a
diameter at least as large as that of the valve opening and direct it toward an area where
the discharge of water cannot harm people. This is a standard feature of units equipped
with the optional buffer tank (optional).
Warning: When making the plumbing connections, make sure there are no open flames
in proximity to or inside the unit.
5.4
SAFETY DEVICES ON THE HIGH PRESSURE SIDE
Cooling circuit safety devices are provided on each refrigerant circuit according to the volumetric capacity
of the compressors installed, as prescribed by Directive 97/23 (PED); in particular, with respect to
equipment design, this Directive requires manufacturers to abide by the technical standard nearest to the
type of object produced; in the case of chillers designed for air conditioning or liquid cooling systems,
standard UNI EN 378-2 is taken into consideration.
According to this standard, for refrigerant mass flow rates of up to 25dm3 per circuit only one pressure
limiting device is required; beyond this limit 2 must be applied. Practically speaking, these are safety
pressure switches designed to protect the cooling circuit in a cascade fashion.
What is meant by cascade protection is illustrated in the figure:
…where pressure switch 1 is set at the “PS” (maximum admissible pressure) of the system, while
pressure switch 2 will have the setting = PS x 0.9 in accordance with the reference technical standard.
Pressure switch 1
Cut out
Pressure switch 2
Cut out
Cut in
Cut in
