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▶
In order to control the cylinder's post-heating, connect
a VR 10 temperature sensor or a thermostat to the plug
that is connected to the main PCB.
Wiring diagram (→ Page 47)
▶
Set diagnostics code D.026 to 1.
Overview of diagnostics codes (→ Page 39)
5.1.5
Basic system diagram type 5: Cascade with
two to seven boilers + a cylinder that is
connected to the heating circuit
1
Wall-hung boiler with
internal pump
2
Heating circuits
3
Low loss header or
plate heat exchanger
The product can control a cascade system.
Number for
Control
the basic
system
diagram
0020259033
VRC 700
system
control
VR 71 multi-
functional
module
The settings for the internal pump are made at the factory.
▶
Ensure that there is sufficient dimensioning for the
connections and the domestic hot water cylinder.
(→ Page 13)
▶
Downstream of the low loss header, select a domestic
hot water pump that is suitable for the domestic hot water
cylinder.
▶
Connect the pump for the decoupled domestic hot water
circuit to the plug X13 for the main PCB.
▶
Connect the temperature sensor for the low loss header
to plug X41 on the main PCB. Observe the instructions
for the low loss header.
0020261188_00 ecoTEC plus Installation and maintenance instructions
1
2
3
6 4
5
6
4
External pump for the
decoupled domestic hot
water circuit
5
External domestic hot
water circulation pump
6
Domestic hot water
cylinder
Number
Wiring
of cir-
cuits
>3
See the instructions
for the system con-
trol.
▶
In order to control the cylinder's post-heating, connect
a VR 10 temperature sensor or a thermostat to the plug
that is connected to the main PCB.
Wiring diagram (→ Page 47)
▶
Set diagnostics code D.026 to 1.
Overview of diagnostics codes (→ Page 39)
5.2
Selecting the domestic hot water cylinder
The product can control an optional domestic hot water cylin-
der (recommended option for products with an output below
50 kW).
▶
Use a low loss header for products that are connected to
a domestic hot water cylinder and have a domestic hot
water output requirement of over 50 kW, . (→ Page 13)
▶
Use the following components to connect the domestic
hot water cylinder:
Domestic hot water cylinder
VC 406/5-5 (E-DE)
VC 406/5-5 (LL-DE)
VC 476/5-5 (E-DE)
VC 476/5-5 (LL-DE)
VC 636/5-5 (E-DE)
VC 636/5-5 (LL-DE)
5.3
Selecting a low loss header
The low loss header disconnects the heat generator hydraul-
ically from the heating system. This prevents feed head in-
teractions between the individual circulation pumps. Further-
more, the low loss header ensures that a sufficient minimum
volume of water continuously circulates through the heat
generator.
▶
Observe the information on treating heating water.
(→ Page 19)
▽
If you cannot guarantee the conditions for treating
the heating water, install an external plate heat ex-
changer to protect the product.
Low loss header
VC 406/5-5 (E-DE)
VC 406/5-5 (LL-DE)
VC 476/5-5 (E-DE)
VC 476/5-5 (LL-DE)
VC 636/5-5 (E-DE)
VC 636/5-5 (LL-DE)
▶
Observe the instructions for the low loss header.
You do not require any electronic accessories when using
a low loss header. You can connect simple installations dir-
ectly inside the electronics box.
▶
Observe the wiring diagram.
Installation 5
Cylinder
Internal dia-
meter of the
connection
VIH R 300
20 mm
VIH R 300
20 mm
VIH R 300
20 mm
VIH R 300
20 mm
VIH R 500
25 mm
VIH R 500
25 mm
Heating system spread
10 K
15 K
20 K
WH 95
WH 40-2
WH 40-2
WH 95
WH 40-2
WH 40-2
WH 95
WH 40-2
WH 40-2
WH 95
WH 40-2
WH 40-2
WH 160
WH 95
WH 40-2
WH 160
WH 95
WH 40-2
13
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