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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
pump (RA, RAE accessories) and the compressor crankcase heater. The switch should only be disconnected for cleaning, maintenance
or repair of the machine.
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 evapo-
rator 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
fc G
Correction factor of the glycol water flow to the evaporator
fc Δpw Correction factor of the pressure drops in the evaporator
fc QF
Cooling capacity correction factor
fc P
Correction factor for the absorbed electrical current.
2.9. ADDITIONAL INFORMATION
Set-up of a 3-way heat pump and domestic hot water production (DHW)
With this type of system, the main circuit of the heat pump produces DHW (winter season) or DCW (summer season) for the user. The unit can be set up
with pumps as an alternative to the traditional solution that sees them installed in the system. For the production of DHW by using the heat pump, use a
technical water storage tank, which cannot be used directly for human consumption, and combine it to a DHW producer/intermediate heat exchanger. If a 3-
way valve is included in the system, the production of hot water towards the domestic hot water circuit can be managed in both summer and winter; in fact
the valve diverts the water flow from the system to the technical water storage tank for the domestic hot water production system (domestic hot water di-
verter valve CACS consent + domestic hot water valve VACS control).
H5xxxxx
67
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
EasyPACK ECO - Nias
-6
-10
25
30
-13
-16
1.072
1.093
1.255
1.319
0.956
0.948
0.988
0.986
1
Heat pump
2
System user side storage tank
3
Pump
4
3-way valve - Not supplied
5
User-DHW
6
System recovery side storage tank
-15
-20
35
40
-20
-25
1.116
1.140
1.383
1.468
0.944
0.937
0.983
0.981
67
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