Protecting The Water Circuit Against Freezing - Ferroli OMNIA H Series Installation, Maintenance And User Manual

■ The unit is only to be used in a closed water system. Application in an open water circuit can lead to excessive corrosion of the
water piping.
■ Water connections must be made in accordance with the outlook diagram delivered with the unit, with respect to the water intake
and water outlet (refer to section "DIMENSIONAL AND PHYSICAL DATA").
If air, moisture or dust gets in the water circuit, problems may occur. Therefore, always take into account the following when connecting
the water circuit:
■ Use clean pipes only.
■ Hold the pipe end downwards when removing burrs
■ Cover the pipe end when inserting it through a wall so that no dust and dirt enter.
■ Use a good thread sealant for sealing the connections. The sealing must be able to withstand the pressures and temperatures of
the system.
■ When using non-brass metallic piping,make sure to insulate both materials from each other to prevent galvanic corrosion. Never
use Zn-coated parts in the water circuit. Excessive corrosion of these parts may occur as copper piping is used in the unit's internal
water circuit.
■ Be careful not to deform the unit's piping by using excessive force when connecting the piping. Deforming the piping
can cause the unit to malfunction.

Protecting the water circuit against freezing

Frost can cause damage to the hydraulic circuit. If the unit's hydraulic circuit is expected to be subject to temperatures that may cause
freezing, care must be taken to prevent freezing of the system.
All hydraulic parts are insulated to reduce heat loss. Insulation must be present on the fi eld piping.
The unit is already equipped with several features to prevent freezing.
■ The software contains special functions using the heat pump to protect the entire system against freezing.
When the temperature of the water fl ow in the system drops to a certain value, the software will heat the water, either using the heat
pump, the electric heating tap, or the backup heater(if backup heater box is installed). The freeze protection function will turn off only when
the temperature increases to a certain value.
In case of a power failure, the features mentioned above cannot protect the unit from freezing. Since a power failure could happen when the
unit is unattended, the supplier recommends adding glycol to the water system. Refer to "Caution: Use of glycol".
Since a power failure could happen when the unit is unattended, the supplier recommends adding glycol to the water system. Refer to
"Caution: Use of glycol".
Depending on the expected lowest outdoor temperature, make sure the water system is fi lled with a concentration of glycol as mentioned
in the table below.
When glycol is added to the system, the performance of the unit will be affected. The correction factor of the unit capacity, fl ow rate and
pressure drop of the system is listed in the table below:
Correction factor for the use of glycol in heating mode
ETHYLENE GLYCOL with water produced between 30 ÷ 55 º C.
Percentage Of glycol in mass / volume
Freezing point [°C]
CCPT - Heating capacity
CCPA - Power input
CCQA - Water flow rate
CCDP - Water pressure drop
PROPYLENE GLYCOL with water produced between 30 ÷ 55ºC.
Percentage Of glycol in mass / volume
Freezing point [°C]
CCPT - Heating capacity
CCPA - Power input
CCQA - Water flow rate
CCDP - Water pressure drop
Correction factor for the use of glycol in cooling mode
ETHYLENE GLYCOL with water produced between 5 ÷ 20 º C.
Percentage Of glycol in mass / volume
Freezing point [°C]
CCPF - Cooling capacity
CCPA - Power input
CCQA - Water flow rate
CCDP - Water pressure drop
PROPYLENE GLYCOL with water produced between 5 ÷ 20 º C.
Percentage Of glycol in mass / volume
Freezing point [°C]
CCPF - Cooling capacity
CCPA - Power input
CCQA - Water flow rate
CCDP - Water pressure drop
18
INSTALLATION
0 / 0 10 / 8,9
0 -3,2
1,000 0,995
1,000 1,010
1,000 1,038
1,000 1,026
0 / 0 10 / 9,6
0 -3,3
1,000 0,990
1,000 1,010
1,000 1,018
1,000 1,026
0 / 0 10 / 8,9
0 -3,2
1,00 0,99
1,00 1,00
1,00 1,04
1,00 1,08
0 / 0 10 / 9,6
0 -3,3
1,00 0,98
1,00 0,99
1,00 1,01
1,00 1,05
20 / 18,1 30 / 27,7
-8 -14
0,985 0,975
1,015 1,020
1,062 1,091
1,051 1,077
20 / 19,4 30 / 29,4
-7 -13
0,975 0,965
1,020 1,030
1,032 1,053
1,051 1,077
20 / 18,1 30 / 27,7
-8 -14
0,98 0,97
0,99 0,99
1,08 1,12
1,16 1,25
20 / 19,4 30 / 29,4
-7 -13
0,96 0,94
0,98 0,95
1,03 1,06
1,11 1,22
40 / 37,5
-22
0,970
1,030
1,127
1,103
40 / 39,6
-21
0,955
1,040
1,082
1,103
40 / 37,5
-22
0,95
0,98
1,16
1,35
40 / 39,6
-21
0,92
0,93
1,09
1,38