20
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 .
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.
■ When using a 3-way valve in the water circuit. Preferably choose a ball type 3-way valve to guarantee full separation between
the domestic hot water and floor heating water circuit.
■ When using a 3-way valve or a 2-way valve in the water circuit. The recommended maximum changeover time of the valve
should be less than 60 seconds .
■ 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 pres-
sures 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 .
■ Because brass is a soft material, use appropriate tools for connecting the water circuit. Inappropriate
tools will cause damage to the pipes .
HYDRAULIC CONNECTIONS
Correction factor for the use of glycol in heating mode
ETHYLENE GLYCOL
with water produced between 30 ÷ 55 º C .
PROPYLENE GLYCOL
with water produced between 30 ÷ 55ºC .
Percentage Of glycol in mass / volume
0 / 0
10 / 8,9
20 / 18,1
30 / 27,7
40 / 37,5
Freezing point [°C]
0
-3,2
-8
-14
-22
CCPT - Heating capacity
1,000
0,995
0,985
0,975
0,970
CCPA - Power input
1,000
1,010
1,015
1,020
1,030
CCQA - Water flow rate
1,000
1,038
1,062
1,091
1,127
CCDP - Water pressure drop
1,000
1,026
1,051
1,077
1,103
Percentage Of glycol in mass / volume
0 / 0
10 / 9,6
20 / 19,4
30 / 29,4
40 / 39,6
Freezing point [°C]
0
-3,3
-7
-13
-21
CCPT - Heating capacity
1,000
0,990
0,975
0,965
0,955
CCPA - Power input
1,000
1,010
1,020
1,030
1,040
CCQA - Water flow rate
1,000
1,018
1,032
1,053
1,082
CCDP - Water pressure drop
1,000
1,026
1,051
1,077
1,103
Correction factor for the use of glycol in cooling mode
ETHYLENE GLYCOL
with water produced between 5 ÷ 20 º C .
PROPYLENE GLYCOL
with water produced between 5 ÷ 20 º C .
Percentage Of glycol in mass / volume
0 / 0
10 / 8,9
20 / 18,1
30 / 27,7
40 / 37,5
Freezing point [°C]
0
-3,2
-8
-14
-22
CCPF - Cooling capacity
1,00
0,99
0,98
0,97
0,95
CCPA - Power input
1,00
1,00
0,99
0,99
0,98
CCQA - Water flow rate
1,00
1,04
1,08
1,12
1,16
CCDP - Water pressure drop
1,00
1,08
1,16
1,25
1,35
Percentage Of glycol in mass / volume
0 / 0
10 / 9,6
20 / 19,4
30 / 29,4
40 / 39,6
Freezing point [°C]
0
-3,3
-7
-13
-21
CCPF - Cooling capacity
1,00
0,98
0,96
0,94
0,92
CCPA - Power input
1,00
0,99
0,98
0,95
0,93
CCQA - Water flow rate
1,00
1,01
1,03
1,06
1,09
CCDP - Water pressure drop
1,00
1,05
1,11
1,22
1,38
Protecting the water circuit against freezing
Frost can cause damage to the hydraulic system . As this unit is in-
stalled outdoors and thus the hydraulic system is exposed to
freezing temperatures, 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 field piping.
The unit is already equipped with several features to prevent free-
zing .
■ The software contains special functions using the heat pump to
protect the entire system against freezing .
When the temperature of the water flow 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 hea-
ter 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 filled 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, flow rate and
pressure drop of the system is listed in the table below:
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