E93.1001EN.C Manual CD
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41
C
ASCADE SET
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UP
CD
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water heaters and tanks can be installed cascaded in a number of possible combinations according to the
instructions in the next paragraphs.
For the installation of cascaded water heaters and tanks, always consult the tables in § 9.5. All
requirements concerning pipe diameters and lengths as well as pump selection are presented or-
derly here.
By applying these you’ll improve both the well-functioning and the life time of your CD
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installation.
PUMP
NON RETURN VALVE
VALVE
SAFETY VALVE
AUTOMATIC AIR VENT
FILTER
INLET COMBINATION
- Overflow
- Controllable return valve
- Valve
PRESSURE REGULATING VALVE
Example of a combination of three water heat-
ers and two tanks
Notes:
•
Connections on the water heater side should
always
be executed as drawn in the picture above.
•
1
Always apply safety components according to all applicable regulations.
•
2
Sensor mounting: p.t.o.
•
3
In case of more than one tank, mount the tank sensor on one of the tank outlets. The temperature of
this tank will be assumed to be representative for all, provided that the installation design is correct.
•
In the inlet (return) connection of the water heater no check valve is recommended.
•
All designs and tables in the next paragraphs go up to eight water heaters max. If needed, the water
heater control can handle up to twelve water heaters.
•
For large capacity installations (more than two water heaters) consult EHS.
B
C
B
C
7
3
1
2
A
A
5
6
6
6
6
6
6
6
6
Extra explanation:
1) Pressure relief valve (mandatory in case water pres-
sure is too high)
2) Inlet combination with valve (mandatory)
3) Apply filter if necessary (recommended)
4) A suitable safety valve must be mounted near the wa-
ter heater (mandatory)
1
This safety valve may never be isolated from the wa-
ter heater by means of a ball valve
5) Mount remote tank sensor in the screw hole on the
return pipe of one tank (see picture) (necessary)
When screwing is not possible, mount the tank sensor
on the return pipe as close as possible to one of the
tanks
2, 3
6) Drain valve (recommended)
7) Hot and cold water mixers
A) Cold water inlet (service pipe)
B) Hot water supply circulation
C) Circulation return
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4
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