Domestic Hot Water; Circulation Connection; Insulating The Connections; Connection Example For Boiler/Solar - CTC EcoWater 300 Instructions D'installation Et D'entretien

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2.2

Domestic hot water

When connecting the hot water please consider the piping material and
water quality to avoid problems with corrosion.
Pipes of Galvanized Steel
One of the major causes of damage to the water system is internal corrosion
of hot water pipes in galvanized steel systems. Normally fittings are most
vulnerable to internal corrosion. Dissolved copper in the water from copper
pipes in the system, increases the risk of corrosion. Considering the rule that
copper should follow galvanized steel in the water flow direction will reduce
the risk. In some installations reflux can occur and thus increasing the risk of
corrosion due to higher copper content in the water.
Pipes of Copper
Copper is usually fully resistant to corrosion in water, but as all other
materials, it has its limitations. Internal corrosion of copper due to turbulence
corrosion is a frequent cause of damages. This applies particularly in bends.
Turbulence corrosion occurs when the speed of the water is between 1,2 to
1,5 m/s and the quality of the water is adverse.
2.3

Circulation connection

Circulation of hot water will increase energy losses and installed piping and
connections must be well insulated. Circulating pump must not be too large,
use any variable pump type or a flow control valve.
2.4

Insulating the connections

All pipes must be insulated to prevent heat loss. If the heating coil is not
used it must be blinded and insulated.
2.5 Connection example for boiler/
solar
Heat pump status: "HP+Boil".
When the temperature is below T
The supplementary heating stops when the temperature is above T
Tmin 35 °C ensures 35 °C domestic water, even if the heat pump cannot
provide enough energy.
Connecting to relay exits:
CN2-5 Phase and CN2-6 Null.
Supplementary heating Boiler (230 V AC, 10 amps).
10
CTC EcoWater
-1 °C the supplementary heating starts.
min
Cold water
pipe:
Copper pipe
Steel pipe
Plastic pipe
Recommended pipe configurations
+1°C
min
Hot water
pipe:
Copper pipe
Steel or copper
Steel or copper