Vaillant ecoTEC plus VU 446/5-5 (H-GB) Installation And Maintenance Instructions Manual page 22

4 Heating circuit
5 External pump for the
decoupled domestic hot
water circuit
The product can control a decoupled heating circuit and a
decoupled domestic hot water cylinder.
Number for Control
the basic system
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 66)
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 23)
▶
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 64)
▶
Set diagnostics code D.026 to 2.
Overview of diagnostics codes (Validity: VU 446/5-5 (H-
GB) OR VU 606/5-5 (H-GB)) (→ Page 55)
22
6 Domestic hot water
cylinder
Number Carrying out the
of cir- wiring
cuits
1 Inform Customer
Service.
2 See appendix or
contact customer
service for special
basic diagrams.
>3 Inform Customer
Service.
7.2.4 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.
Number for Control
the basic system
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 23)
▶
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.
▶
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 64)
▶
Set diagnostics code D.026 to 1.
Overview of diagnostics codes (Validity: VU 446/5-5 (H-
GB) OR VU 606/5-5 (H-GB)) (→ Page 55)
Installation and maintenance instructions ecoTEC plus 0020261389_03
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 Inform Customer
Service.