Hitecsa EWFAIB, Installation, Operation And Maintenance Instructions, Page: 14 / 49

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English
4 - Installation
4.1 Installation Site
DANGER
Before installing the unit, make sure that
the building structure and/or the supporting
surface can withstand the weight of the
device. The weights of the units are detailed
by Chapter 9 of this manual.
These units have been designed to be installed on the floor, in the
open air. As a standard, they are equipped with rubber vibration-
damping supports which shall be arranged in the middle, beneath
the supporting plates.
When the unit is to be installed on the ground, provide for a concrete
bedplate which shall assure a uniform distribution of the weights. No
special subbase is generally required.
When selecting the installation site, never forget to consider as
follows:
Q The longitudinal axis of the unit shall be parallel to the direction of
the prevailing winds so as to assure a uniform air distribution on
finned exchangers.
Q The unit shall never be installed in the proximity of chimneys for
the discharge of boiler flue gases.
Q
The unit shall never be installed downwind of sources of grease
contaminated air, such as for example the outlets of large-
kitchen extractors. Otherwise, grease might build up on the fins
of refrigerant / air exchangers or condensers, act as a fixing
agent for any sort of atmospheric impurity and rapidly cause the
exchangers to clog.
Q The unit shall never be installed in areas exposed to heavy
snowfalls.
Q The unit shall never be installed in areas exposed to flooding or
beneath drip stones, etc.
Q The unit shall never be installed in narrow inner court yards or in
any other restricted space where the noise may be reflected by
the walls or where the air expelled by the fans may short-circuit
on the refrigerant/air heat exchangers or condensers.
Q
The installation site shall be characterised by the presence of
the space required for air circulation and for the performance of
maintenance operations (see chapter 9 for further details).
4.2 External Water Circuit
WARNING
The external water circuit shall guarantee a
constant water flow rate through the circulating
refrigerant/water heat exchanger (evaporator)
under steady operating conditions and in case
of a load variation.
The circuit shall be composed by the following elements:
Q A circulation pump which can ensure the necessary flow rate and
head.
Q
The total content of the primary water circuit shall never be
lower than 2.5 lt/kW in terms of refrigerating capacity. If the total
water volume in the primary circuit should be unable to reach
such a value, an additional heat-insulated storage tank should be
installed. This tank is intended to avoid any repetitive start of the
compressor.
Q
A membrane expansion tank complete with a safety valve and a
drain which shall be visible.
NOTE
The expansion tank shall be dimensioned in
such a way that it can absorb a 2% expansion
of the total volume of the water in the plant
(exchanger, pipelines, uses and storage tank,
if available). The expansion tank shall never
be insulated when the circulating fluid is not
flowing through it.
A differential pressure switch is mounted as a standard. It will stop
the unit whenever it senses a load loss through the heat exchanger
which may result in a flow rate problem.
In addition:
Q
Install on/off valves (accessory) on the lines at the inlet and outlet
of the manifolds of the exchangers (evaporator).
Q
Arrange a by-pass complete with an on/off valve between the
manifolds of the heat exchangers.
Q
Arrange air vent valves at the high points of the water lines.
Q Arrange drain points complete with plugs, clocks, etc. in the
proximity of the low points of the water lines.
Q Insulate the water lines to prevent the heat from blowing back into
the unit.