5 Installation
5.1
Hydraulic connections
5.1.1
Connecting the hot tap water circuit
General
Both an independently installed cascade system and a complete cascade
system will allow hot tap water to be prepared. You can in principle con
nect an indirectly fired calorifier (use one of the outer boilers) to each boil
er. When selecting an output for the calorifier, select a value that is at least
one half of the boiler output, up to a maximum value that is equal to the
boiler output.
Important
If only the MCA 160 is used, an external regulator is not required.
The integrated Diematic Evolution regulator can be used.
Connecting a calorifier pump
If you use an MCA 160 to boost the calorifier in an independently installed
cascade system, we advise using a calorifier pump.
The water resistance of the MCA 160 is approx. 170 mbar at a flow rate
of 6.5 m
3
/h (ΔT = 20 °C).
Select a calorifier pump that can withstand this resistance, plus the resist
ance of the chosen calorifier and appendages. Only use an auxiliary relay
if the output of the calorifier pump is more than 300 VA.
Calorifier connection as heating group
Fig.35
Calorifier as heating group
AD-0001449-01
3
1
15
16
1
1
4
2
A
B
B
2
2
6
5
8
9
7
10
14
13
11
12
A Cascade master
B Cascade slave
1 Boiler pump
2 Safety valve
3 Non-return valve
4 Manual seal
5 Air vent
6 Low-loss header
5 Installation
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MCA
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