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The entire circuit must be drained in good time. A drainage point below the water exchanger must be used to make sure all the water empties out. Moreo-
ver, use the valves placed in the lower part of the water exchanger so that is empties completely. If the draining operation is felt to be too much trouble,
ethylene glycol may be mixed with the water in suitable proportions in order to guarantee protection from freezing. Units are available with an antifreeze
heater (accessory) to keep the evaporator intact, should the temperature drop excessively.
IMPORTANT!
The unit must not be isolated from the electrical power supply during the entire seasonal stoppage
Indications for unit when running
When the unit is running, the control board protects the water side heat exchanger from freezing by triggering the antifreeze alarm, which stops the ma-
chine if the temperature of the sensor fitted on the heat exchanger reaches the set point value. The resistance of the water side primary and secondary
heat exchanger (RA-RDR accessory), the storage tank (RAS accessory) and the electric pump unit (RAE-RAR accessory), prevents undesired effects due
to freezing during the operating breaks in winter (provided the unit remains powered).
IMPORTANT!
If the mains switch is opened, it cuts off the electricity supply to the storage tank plate exchanger heater, the antifreeze heater of the
storage tank and the pump (RA, RDR, RAE, RAR, RAS accessories) and the compressor crankcase heater. The switch should only be
disconnected for cleaning, maintenance or repair of the machine.
2.6.5. USE OF ANTIFREEZE SOLUTIONS
o The use of ethylene glycol is recommended if you do not wish to drain the water from the hydraulic system during the winter stoppage, or if the unit has
to supply chilled water at temperatures lower than 5°C The addition of glycol changes the physical properties of the water and consequently the perfor-
mance of the unit. The proper percentage of glycol to be added to the system can be obtained from the most demanding functioning conditions from
those shown below.
o Table shows the multipliers which allow the changes in performance of the units to be determined in proportion to the required percentage of ethylene
glycol.
o The multipliers refer to the following conditions: condenser inlet water temperature 30°C; chilled water temperature 7°C; temperature differential at
evaporator 5°C.
o For different functioning conditions, the same coefficients can be used as their variations are negligible.
o The resistance of the primary water side heat exchanger (RA accessory) prevents undesired freezing effects during stops in winter functioning mode
(as long as the unit is powered electrically).
Design air temperature in °C
% glycol in weight
Freezing temperature
fc G
fc Δpw
fc QF
fc P
Correction factor of the glycol water flow to the evaporator
fc G
fc Δpw Correction factor of the pressure drops in the evaporator
Cooling capacity correction factor
fc QF
Correction factor for the absorbed electrical current.
fc P
2.7. INFORMATION ON THE ACCESSORIES
2.7.1. APPLICATIONS FOR PARTIAL (DS) AND TOTAL (RC100) RECOVERY AND DHW PRODUCTION
Overview
Condensation heat in a chiller is usually disposed of in the air; it can be recovered intelligently by means of heat recovery, which may be partial (DS) or
total (RC100). With summer operation, a reduced value equivalent to the desuperheating of gas is recovered in the first phase, while the second phase
recovers all the condensation heat that would otherwise be lost.
In case of a reversible heat pump, partial recovery (DS) can also operate in winter mode. Partial recovery (DS) subtracts a rate from the heat production in
the main heat exchanger.
IOM_EQRU-SS_EQRHU-SS_2160a4350_208676_230601_ES-EN-FR-DE-IT
87
2
0
-3
10
15
20
-5
-7
-10
1.025
1.039
1.054
1.085
1.128
1.191
0.975
0.967
0.963
0.993
0.991
0.990
-6
-10
-15
25
30
35
-13
-16
-20
1.072
1.093
1.116
1.255
1.319
1.383
0.956
0.948
0.944
0.988
0.986
0.983
EQRU-EQRUSS
EQRHU-EQRHUSS
-20
40
-25
1.140
1.468
0.937
0.981
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