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.
