Vaillant ecoTEC plus VC 406/5-5 Installation And Maintenance Instructions Manual page 13

5 Installation
5.1.3 Basic system diagram type 3: Decoupled
heating circuit plus one decoupled
domestic hot water cylinder
1
2
3
1 Wall-hung boiler with
internal pump
2 Low loss header or
plate heat exchanger
3 External pump for the
decoupled heating
circuit
The product can control a decoupled heating circuit and a
decoupled domestic hot water cylinder.
Reference Control
number for system
the basic
diagram
0020259029 VRC 700
system
control
0020259030 VRC 700
system
control
VR 70 multi-
functional
module
0020259031 VRC 700
system
control
VR 71 multi-
functional
module
Note
The example of a basic installation diagram that
is shown in the appendix does not replace any
correct and expert system planning. (→ Page 49)
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 heating
pump that is appropriate for the installation.
▶
Downstream of the low loss header, select a domestic
hot water pump that is suitable for the domestic hot water
cylinder.
12
6
4 5
4 Heating circuit
5 External pump for the
decoupled domestic hot
water circuit
6 Domestic hot water
cylinder
Number Carrying out the
of cir- wiring
cuits
1 Observe the instruc-
tions for the system
control.
2 See appendix.
>3 Observe the instruc-
tions for the system
control.
▶
Connect the external pump for the decoupled heating
circuit to the plug X16 for the main PCB.
▶
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.
▶
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 2.
Overview of diagnostics codes (→ Page 39)
5.1.4 Basic system diagram type 4: Cascade
with two boilers plus one cylinder that is
connected to the boiler
1 Wall-hung boiler with
internal pump
2 Prioritising diverter
valve
3 Low loss header or
plate heat exchanger
The product can control a cascade system.
Reference Control
number for system
the basic
diagram
0020259032 VRC 700
system
control
VR 70 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)
▶
Connect the domestic hot water circulation pump to the
plug X16 on the main PCB.
▶
Connect the external prioritising diverter valve to the plug
X13 on 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.
Installation and maintenance instructions ecoTEC plus 0020261188_00
1 6
2
3
4
5
4 Domestic hot water
cylinder
5 Heating circuits
6 External domestic hot
water circulation pump
Number Carrying out the
of cir- wiring
cuits
2 Observe the instruc-
tions for the system
control.