LCX
RG66010687_rev.00
29
8.1
WATER FLOW TO EVAPORATOR
The nominal flow rate is based on a temperature differential of 5° C between inlet and outlet water, in
relation to the cooling capacity provided at the nominal water (12/7 °C) and air (35°C) temperatures.
The maximum allowed flow rate is associated with a temperature differential of 3 °C: higher flow rates,
though admissible, cause pointless, high drops in pressure.
The minimum allowed flow rate is associated with a temperature differential of 8 °C or a minimum
pressure drop of 10 kPa: lower flow rates cause a reduction in heat exchange coefficients and
excessively low evaporation temperatures, which may trigger the safety devices and cause the unit to
stop.
8.2
CHILLED WATER TEMPERATURE
The minimum temperature of the water leaving the evaporator is 5°C: lower temperatures are possible,
but for such applications the Manufacturer should be consulted at the time the order is placed.
The maximum temperature of the water entering the evaporator is 20°C. To allow higher temperatures
specific equipment solutions must be adapted (split circuits, three-way valves, bypasses, buffer tanks):
applications outside the specified limits may be authorised by the manufacturer subject to verification and
subsequent authorisation in writing.
8.3
EXTERNAL AIR TEMPERATURE
The units are designed and built to work with outdoor air temperatures ranging from -10 (with
condensation control) to 45 °C: applications outside the specified limits may be authorised by Galletti
S.p.A. subject to verification and subsequent authorisation in writing. On request, the units may be
equipped with an electric heating element to heat up the evaporator in cases where the unit is exposed to
severe temperatures during wintertime shutdown periods.
The heating element is activated whenever the temperature of the water leaving the evaporator falls
below the temperature set on the antifreeze probe.
8.4
OPERATION WITH WATER AT LOW TEMPERATURES
The standard units are not designed to work with chilled water temperatures below 5°C at
the evaporator outlet. In order to work below this limit, the unit requires specific technical
adjustments: in such cases contact the Manufacturer.
9 SETTING OPERATING PARAMETERS
9.1 GENERAL
INFORMATION
All of the control equipment is calibrated and commissioned in the factory before the unit is shipped.
However, after the unit has worked for a reasonable amount of time, a control of the operation and safety
devices may be carried out. The settings are shown in Tables I and II.
All servicing of the control equipment must be carried out EXCLUSIVELY BY
QUALIFIED PERSONNEL: incorrect calibration values can seriously damage the
unit and persons as well.
