
PRODUCT DETAILS
6 720 645 752 (2012/05) 5
2.4 STANDARD DELIVERY
Fig. 1
[1] Twin Coil DHW cylinder
[2] Temperature and pressure relief valve
[3] Immersion heater, 3 kW
[4] Tundish Ø 15/22 mm
[5] Solar high limit thermostat
[6] Cold water Inlet control group
[7] 2-Port valve
[8] Dual cylinder thermostat
[9] DHW expansion vessel incorporating fixing bracket with
connection hose
[10] Connection set
[11] Set of printed documents for the appliance
2.5 SCALING/CORROSION PROTECTION
The cylinder is made from corrosion-resistant Duplex stainless steel.
The cylinder can be used with all mains water supplies.
Scaling: In cases where the water hardness is very high (over 450 ppm)
a water softener must be used to protect the cylinder against rapid
development of scale.
Corrosion protection: Any water softener should be installed,
commissioned and maintained to ensure the water hardness after the
softener is never below 150 ppm.
2.6 DESCRIPTION OF FUNCTION
• If there is insufficient heat input available via the primary (lower) coil,
the secondary heating appliance will heat the upper coil.
• Due to temperature stratification only the upper section of the
cylinder will be heated.
• When hot water is being drawn off, the cylinder temperature in the
upper section drops by approximately 8 °C to 10 °C before the heat
source reheats the cylinder.
AQU-18-3W
AQUA-15-3W
AQU-16-3W
AQU-17-3W
AQ
U
-19-3W
A
Q
U-
2
1
-
3W
AQU-31-3W
1 4
5
6
7
8
9
10
11
2
3
6 720 645 525-07.2O
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