Vaillant ecoTEC plus VC 406/5-5 User Manual

5 Installation
12 Installation and maintenance instructions ecoTEC plus 0020261188_00
5.1.3 Basic system diagram type 3: Decoupled
heating circuit plus one decoupled
domestic hot water cylinder
1
2
3
4 5
6
1 Wall-hung boiler with
internal pump
2 Low loss header or
plate heat exchanger
3 External pump for the
decoupled heating
circuit
4 Heating circuit
5 External pump for the
decoupled domestic hot
water circuit
6 Domestic hot water
cylinder
The product can control a decoupled heating circuit and a
decoupled domestic hot water cylinder.
Reference
number for
the basic
diagram
Control
system
Number
of cir-
cuits
Carrying out the
wiring
0020259029 VRC 700
system
control
1 Observe the instruc-
tions for the system
control.
0020259030 VRC 700
system
control
VR 70 multi-
functional
module
2 See appendix.
0020259031 VRC 700
system
control
VR 71 multi-
functional
module
>3 Observe the instruc-
tions for the system
control.
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.
▶ 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
3
2
6
5
4
1 Wall-hung boiler with
internal pump
2 Prioritising diverter
valve
3 Low loss header or
plate heat exchanger
4 Domestic hot water
cylinder
5 Heating circuits
6 External domestic hot
water circulation pump
The product can control a cascade system.
Reference
number for
the basic
diagram
Control
system
Number
of cir-
cuits
Carrying out the
wiring
0020259032 VRC 700
system
control
VR 70 multi-
functional
module
2 Observe the instruc-
tions for the system
control.
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.

Vaillant ecoTEC plus VC 406/5-5 Specifications

General

Brand	Vaillant
Model	ecoTEC plus VC 406/5-5
Category	Boiler
Language	English