Vaillant UK aroTHERM plus User manual

UK aroTHERM plus Schematics
and Installation Guide
Controls: sensoCOMFORT VRC 720, VR92, VR71
This guide booklet contains information to assist in the design, installation and commissioning of your heat
pump system. This booklet should be used alongside all the relevant manuals for the equipment supplied.
Please read the contents very carefully for a successful installation.
Table of Contents
Heat Pump Pre-Installation Checklist ............................................................................................................ 2
Terms and Conditions for Vaillant Schematic Diagrams ............................................................................ 3
Schematic Diagrams / System Conguration Relevant Settings.............................................................. 4
Commissioning technical guide - for use with sensoCOMFORT VRC720 controller......................... 102
Schematics Legend............................................................................................................................................ 118

2
Heat Pump Pre-Installation Checklist
Where applicable, the following should be considered before commencing with the installation of
the heat pump:
Description Checked
Heat pump is correctly sized
Full heat loss and design calculations to BS 12831.
Anti-Freeze Protection – Glycol
Without adequate glycol protection down to -15°C the guarantee of the heat pump
will be invalidated. All glycol should pre-mixed in an appropriate container as per
manufacturers’ instructions and pumped into the system. Hand pumps are not
suitable. Glycol recommendations are; Fernox HP5c, Sentinel R700 and R600.
Glycol Discharge Vessel
Required to collect uid discharged via a PRV. Article Number: 0020145563
Y-Strainer / Dirt Filter
Recommended to be tted on the return to the heat pump. The use of a magnetic
lter is also recommended.
DHW Cylinder with Adequate Coil Rating
When non-Vaillant heat pump DHW cylinders are used, it is recommended using
cylinders with coil rating of minimum 4kW per 1m2.
Correctly sized heat emitters for MCS SCoP rating:
Heat emitters may need over sizing depending on the ow temperature from the
heat pump. Underoor heating will need designing with pipe centres correlating to
the ow temperature.
Vaillant Controls
Correct controls are chosen for the operation of heating zones and DHW: See
appropriate schematic.
3rd Party Controls
When utilising input from 3rd party controllers, Vaillant controls will require a ‘NC’
operation for the input terminals; the heat pump will start running when there is an
open circuit across the terminal. Where it is not possible for a 3rd party controller to
provide this, a relay can be used; most recognisable ones being ‘230V 8 pin Relay’
(DPDT).
Fill and isolation points for all circuits are considered.
Hybrid Systems
Relevant heat and electrical meters are considered when claiming RHI.

3
Terms and Conditions for Vaillant Schematic Diagrams
⬤ All applicable laws and regulations must be followed.
⬤ The Diagram may be subject to alteration at any time.
⬤ Vaillant is not responsible for any inaccuracies or omissions in the information and drawings
provided to it and upon which it relies when constructing the diagrams.
⬤ Any reproduction of the design must have the prior permission of Vaillant.
⬤ During the planning, design, installation and later use of the system, all operating
instructions must be followed.
⬤ In no circumstances shall Vaillant be liable to you or any other third parties for any loss or
damage (including, without limitation, damage for loss of business or loss of prots) arising
directly or indirectly from your use of or inability to use, this diagram.
⬤ Vaillant makes no representations or warranties of any kind, express or implied about the
completeness, accuracy, reliability or suitability of the diagram for any purpose. Any reliance you
place on the diagram is therefore strictly at your own risk.
⬤ These disclaimers and exclusions shall be governed by and construed in accordance with
English law.

4
Schematic Diagrams
The below systems are the most popular system installations in the UK. For further assistance
please call Vaillant Technical on: 0330 100 3540
For the relevant settings in the VRC720 controller, refer to page 20. Care must be taken going
through each setting diligently and adjust as necessary in accordance to system conguration
and property requirements. Only key settings are listed in this document, refer to the VRC720
installation manual for further guidance.
Schematics - 1. Buffer only Page No.
aroTHERM plus with DHW Cylinder, Decoupler, 1 Radiator Zone 6
aroTHERM plus with DHW Cylinder, Decoupler, 1 Underoor Heating Zone (3rd Party) 9
aroTHERM plus with DHW Cylinder, Decoupler, 2 Radiator Zones 12
aroTHERM plus with DHW Cylinder, Decoupler, 1 Radiator Zone, 1 Underoor Heating
Zone (3rd Party)
15
2. HEX. and Buffer
aroTHERM plus with DHW Cylinder, HEX. Module, Decoupler, 1 Radiator Zone 18
aroTHERM plus with DHW Cylinder, HEX. Module, Decoupler, 1 Underoor Heating
Zone (3rd Party).
21
aroTHERM plus with DHW Cylinder, HEX. Module, Decoupler, 2 Radiator Zones 24
aroTHERM plus with DHW Cylinder, HEX. Module, Decoupler, 1 Radiator Zone, 1
Underoor Heating Zone (3rd Party).
27
3. HEX. only
aroTHERM plus with DHW Cylinder, HEX. Module, 1 Radiator Zone 30
aroTHERM plus with DHW Cylinder, HEX. Module, 1 Underoor Heating Zone (3rd
Party)
33
aroTHERM plus with DHW Cylinder, HEX. Module, 2 Radiator Zones 36
aroTHERM plus with DHW Cylinder, HEX. Module, 1 Radiator Zone, 1 Underoor
Heating Zone (3rd Party)
39
4. Hydraulic Station and Buffer
aroTHERM plus with DHW Cylinder, Hydraulic Station, Decoupler, 1 Radiator Zone 42
aroTHERM plus with DHW Cylinder, Hydraulic Station, Decoupler, 1 Underoor Heating
Zone (3rd Party)
45
aroTHERM plus with DHW Cylinder, Hydraulic Station, Decoupler, 2 Radiator Zones 48
aroTHERM plus with DHW Cylinder, Hydraulic Station, Decoupler, 1 Radiator Zone,
1 Underoor Heating Zone (3rd Party)
51
5. Hydraulic Station, HEX. and Buffer
aroTHERM plus with DHW Cylinder, Hydraulic Station, HEX. Module, Decoupler, 1
Radiator Zone
54
aroTHERM plus with DHW Cylinder, Hydraulic Station, HEX. Module, Decoupler, 1
Underoor Heating Zone (3rd Party).
57
aroTHERM plus with DHW Cylinder, Hydraulic Station, HEX. Module, Decoupler, 2
Radiator Zones
60
aroTHERM plus with DHW Cylinder, Hydraulic Station, HEX. Module, Decoupler, 1
Radiator Zone, 1 Underoor Heating Zone (3rd Party).
63

5
6. Hydraulic Station and HEX.
aroTHERM plus with DHW Cylinder, Hydraulic Station, HEX. Module, 1 Radiator Zone 66
aroTHERM plus with DHW Cylinder, Hydraulic Station, HEX. Module, 1 Underoor
Heating Zone (3rd Party)
69
aroTHERM plus with DHW Cylinder, Hydraulic Station, HEX. Module, 2 Radiator Zones 72
aroTHERM plus with DHW Cylinder, Hydraulic Station, HEX. Module, 1 Radiator Zone, 1
Underoor Heating Zone (3rd Party).
75
7. No modules
aroTHERM plus with DHW Cylinder, 1 Radiator Zone 78
aroTHERM plus with DHW Cylinder, 1 Underoor Heating Zone (3rd Party) 81
aroTHERM plus with DHW Cylinder, 2 Radiator Zones 84
aroTHERM plus with DHW Cylinder, 1 Radiator Zone, 1 Underoor Heating Zone (3rd
Party)
87
8. uniTOWER, Buffer
aroTHERM plus with uniTOWER, Decoupler, 1 Radiator Zone 90
aroTHERM plus with uniTOWER, Decoupler, 1 Underoor Heating Zone (3rd Party) 93
aroTHERM plus with uniTOWER, Decoupler, 2 Radiator Zones 96
aroTHERM plus with uniTOWER, Decoupler, 1 Radiator Zone, 1 Underoor Heating Zone
(3rd Party)
99
Bespoke schematic request

6
aroTHERM plus with DHW Cylinder, Decoupler, 1 Radiator Zone
7f 9d
3f
10j
3
MA1
3
BUS BUS BUS BUS BUS BUS BUS BUS
BUS BUS BUS BUS BUS BUS
3
12p
BUS
BUS BUS
2
2
12m
DCF/AF
12
1
10i
8a
9j
9h
2
12b
3
9g
B A
BUS BUS
BUSBUSBUS
8e
7
10e
BUS
BUS BUS
BUS BUS BUS BUS BUS BUS
2a 230 V~ 3
UV1
9r
9r
7
16
230 V~ 317
11
HOT WATER OUTLET
5
12K
12l
8e
MAINS INLET
8c
SEC. CIRCULATION
3e 3
210c
SP1
MA2

7
12p 12
3
POST BFR

DHW CYL
3
12m
24V=
S21
24V=
S20
BUS
- +
X206
X200
NL3L2L1
0 ...24 V 230 V~
Heat Pump
2a
230 V~
DHW / HTG
230 V~ 0 ...24 V
EVU
2 1
VF1 SP1
2 1
ME
2 1
DCF/AF
AF IO DCF
BUS
- +
2 1N 1 2
ZH
N
UV1
Auf Zu
MA2
N L
MA1
N L
230V~
N L
230V~
N L
EVU
ME
DCF / AF
SP1
VF1
BUS
ZH
UV1
MA2
MA1
230 V~
230 V~
230 V~
12b Heatpump Interface
SEC. CIRC.

8
aroTHERM plus with DHW Cylinder, Decoupler, 1 Radiator Zone
Setting Value
Installation
Adapt. heat curve Deactivated
Hybrid manager Bivalence pt
Heating bivalence point -20°
DHW bivalence point: -20°
Alternative point Off
ESCO Heating off
Back-up boiler Off
Basic system diagram conguration
Basic system diagram code 10
HP control module conguration
MO 2 Circulation
pump
Circuit 1
Circuit type Heating
OT switch-off threshold 30o
Heat curve **Site specic
Min. target ow
temperature
15o
Max. target ow
temperature
45o
Set-back mode Normal
Room temp. mod. Expanded
Zone 1
Cylinder Yes
Zone assignment Control
Domestic hot water
Cylinder Active
Anti-legio. day **User
preference
Anti-legio. time **User
preference
Cylinder charging offset 15 K
Cyl. charg. anti-cycl. time 5 min

9
aroTHERM plus with DHW Cylinder, Decoupler, 1 Underfloor Heating
Zone (3rd Party)
7f 9d
3f
10j
3
MA1
2
12m
DCF/AF
EVU
2
UFHX DEMAND
UFH WIRING CENTRE 1
UFHX FLOW
UFHX RETURN
12s 5
10i
8a
9j
9h
2
12b
3
9g
B A
BUS BUS
BUS
8e
7
10e
BUS
BUS BUS
BUS BUS BUS BUS BUS BUS
2a 230 V~ 3
UV1
9r
9r
7
16
230 V~ 317
11
HOT WATER OUTLET
5
12K
12l
8e
MAINS INLET
8c
SEC. CIRCULATION
3e 3
210c
SP1
MA2
12

10
UFH X DEMAND
12s
UFH 1 DEMAND
POST BFR

DHW CYL
24V=
S21
24V=
S20
BUS
- +
X206
X200
NL3L2L1
0 ...24 V 230 V~
Heat Pump
2a
230 V~
12m
DHW / HTG
230 V~ 0 ...24 V
EVU
2 1
VF1 SP1
2 1
ME
2 1
DCF/AF
AF IO DCF
BUS
- +
2 1N 1 2
ZH
N
UV1
Auf Zu
MA2
N L
MA1
N L
230V~
N L
230V~
N L
EVU
ME
DCF / AF
SP1
VF1
BUS
ZH
UV1
MA2
MA1
230 V~
230 V~
230 V~
12b Heatpump Interface
SEC. CIRC.
12

11
aroTHERM plus with DHW Cylinder, Decoupler, 1 Underoor Heating Zone (3rd Party)
Setting Value
Installation
Adapt. heat curve: Deactivated
Hybrid manager Bivalence pt
Heating bivalence point -20o
DHW bivalence point -20o
Alternative point Off
ESCO HP off,
Heating off
Back-up boiler Off
Basic system diagram conguration
Basic system diagram code 10
HP control module conguration
MO 2 Circulation
pump
Circuit 1
Circuit type Heating
OT switch-off threshold 30o
Heat curve **Site specic
Auto Off mode 15o
Max. target ow
temperature
45o
Set-back mode Eco
Room temp. mod. Inactive
Zone 1
Zone activated Yes
Zone assignment No assignmt.
Domestic hot water
Cylinder Active
Anti-legio. day ** User pref.
Anti-legio. time **User pref
Cylinder charging offset 15 K
Cyl. charg. anti-cycl. time 5 min

12
aroTHERM plus with DHW Cylinder, Decoupler, 2 Radiator Zones
3
BUS BUS BUS BUS BUS BUS BUS BUS
BUS BUS BUS BUS BUS BUS BUS BUS BUS
12e
BUS
230 V~
3
3
12p
BUS
2
2
12m
DCF/AF
2
ZN
9b
3
S2
R1
12
1
1
10i
8a
9j
9h
2
12b
3
9g
B A
BUS BUS
BUSBUS
8e
7
10e
BUS
BUS BUS
BUS BUS BUS BUS BUS BUS
2a 230 V~ 3
UV1
9r
9r
7
16
230 V~ 317
11
HOT WATER OUTLET
5
12K
12l
8e
MAINS INLET
8c
SEC. CIRCULATION
3e 3
210c
SP1
MA2
9d
3f
10j
2
ZN
9b
3
S3
R2
12a
2
2
7f
2
S1

13

ZN1 - RAD

ZN2 - RAD
230V~
N L
R1
N L
R2
N L N
R7/R8
N
R9/R10
1 2 1 2
VR 71
N
R11/R12
N
R13
1 2
R3
N L
R4
N L
R5
N L
R6
N L N
230V~
0...24V
S1
1 2
S2
1 2
S3
1 2
S4
1 2
S5
1 2
S6
1 2
S13
I0 I
_- +
BUSS7
1 2
S8
1 2
S9
1 2
S10
1 2
S11
1 2
S12
I0 I
_
230 V~
12e
12p
3
12
12a

DHW CYL
3
12m
24V=
S21
24V=
S20
BUS
- +
X206
X200
NL3L2L1
0 ...24 V 230 V~
Heat Pump
2a
230 V~
DHW / HTG
230 V~ 0 ...24 V
EVU
2 1
VF1 SP1
2 1
ME
2 1
DCF/AF
AF IO DCF
BUS
- +
2 1N 1 2
ZH
N
UV1
Auf Zu
MA2
N L
MA1
N L
230V~
N L
230V~
N L
EVU
ME
DCF / AF
SP1
VF1
BUS
ZH
UV1
MA2
MA1
230 V~
230 V~
230 V~
12b Heatpump Interface
ZN1 - RAD
SEC. CIRC.

BUFFER - TOP
PL 230 V~
SYS. FLOW
ZN2 - RAD

14
aroTHERM plus with DHW Cylinder, Decoupler, 2 Radiator Zones
Setting Value
Installation
Adapt. heat curve Deactivated
Hybrid manager Bivalence pt
Heating bivalence point -20o
DHW bivalence point -20o
Alternative point Off
ESCO Heating off
Back-up boiler Off
Conf. ext. input Bridge,
deactivate
Basic system diagram conguration
Basic system diagram code 10
FM5 conguration 3
FM5 MO Not working
HP control module conguration
MO 2 Circ. pump
Circuit 1
Circuit type. Heating
OT switch-off threshold 30o
Heat curve **Site specic
Min. target ow temp. 15o
Max. target ow temp. 45o
Set-back mode Normal
Room temp. mod. Expanded
Circuit 2
Circuit type Heating
OT switch-off threshold 30o
Heat curve **Site specic
Min. target ow temp. 15o
Max. target ow temp. 45o
Set-back mode Normal
Room temp. mod. Expanded
Zone 1
Zone activated Yes
Zone assignment Control
Zone 2
Zone activated Yes
Zone assignment Rem. contr. 1
Domestic hot water
Cylinder Active
Anti-legio. day **User pref.
Anti-legio. time **User pref.
Cylinder charging offset 15 K
Cyl. charg. anti-cycl. time 5 min

15
aroTHERM plus with DHW Cylinder, Decoupler, 1 Radiator Zone, 1
Underfloor Heating Zone (3rd Party)
7f
2
S1
3
BUS BUS BUS BUS BUS BUS BUS BUS
BUS BUS BUS BUS BUS BUS
12e
BUS
230 V~
3
3
12p
BUS
2
2
12m
DCF/AF
10i
8a
9j
9h
2
12b
3
9g
B A
BUS BUS
BUSBUS
8e
7
10e
BUS
BUS BUS
BUS BUS BUS BUS BUS BUS
2a 230 V~ 3
UV1
9r
9r
7
16
230 V~ 317
11
HOT WATER OUTLET
5
12K
12l
8e
MAINS INLET
8c
SEC. CIRCULATION
3e 3
210c
SP1
MA2
2
3
9b
S2
R1
12
ZN1
1
2
3
UFH WIRING CENTRE
2
9b
S3
R2
ZN2
S7
9d
3f
10j

16

ZN2 - UFH
UFH
DEMAND
4

ZN1 - RAD
230V~
N L
R1
N L
R2
N L N
R7/R8
N
R9/R10
1 2 1 2
VR 71
N
R11/R12
N
R13
1 2
R3
N L
R4
N L
R5
N L
R6
N L N
230V~
0...24V
S1
1 2
S2
1 2
S3
1 2
S4
1 2
S5
1 2
S6
1 2
S13
I0 I
_- +
BUSS7
1 2
S8
1 2
S9
1 2
S10
1 2
S11
1 2
S12
I0 I
_
230 V~
12e
12p
3
12

DHW CYL
3
12m
24V=
S21
24V=
S20
BUS
- +
X206
X200
NL3L2L1
0 ...24 V 230 V~
Heat Pump
2a
230 V~
DHW / HTG
230 V~ 0 ...24 V
EVU
2 1
VF1 SP1
2 1
ME
2 1
DCF/AF
AF IO DCF
BUS
- +
2 1N 1 2
ZH
N
UV1
Auf Zu
MA2
N L
MA1
N L
230V~
N L
230V~
N L
EVU
ME
DCF / AF
SP1
VF1
BUS
ZH
UV1
MA2
MA1
230 V~
230 V~
230 V~
12b Heatpump Interface
SEC. CIRC.
ZN1 - RAD
PL 230 V~
SYS. FLOW
ZN2 - UFH

BUFFER-TOP

17
aroTHERM plus with DHW Cylinder, Decoupler, 1 Radiator Zone, 1 Underoor Heating
Zone (3rd Party)
Setting Value
Installation
Adaptive heat. curve Deactivated
Hybrid manager Bivalence pt.
Heating bivalence point -20o
DHW bivalence point: -20o
Alternative point Off
ESCO Heating off
Back-up boiler Off
Conf. ext. input Open, deactiv.
Basic system diagram conguration
Basic system diagram code 10
FM3 conguration: 3
FM3 MO Not working
HP control module conguration
MO 2 Circ. pump
Circuit 1
Circuit type Heating
OT switch-off threshold 30o
Heat curve **Site specic
Min. target ow temp. 15o
Max. target ow temp. 45o
Set-back mode Normal
Room temp. mod. Expanded
Circuit 2
Circuit type Heating
OT switch-off threshold 30o
Heat curve **Site specic
Min. target ow temp. 15o
Max. target ow temp. 45o
Set-back mode Eco
Room temp. mod. Inactive
Zone 1
Zone activated Yes
Zone assignment Control
Zone 2
Zone activated Yes
Zone assignment No assignmt
Domestic hot water
Cylinder Active
Anti-legio. day **User pref.
Anti-legio. time **User pref.
Cylinder charging offset 15 K
Cyl. charg. anti-cycl. time 5 min

18
aroTHERM plus with DHW Cylinder, HEX. Module, Decoupler, 1
Radiator Zone
7f 9d
3f
10j
3
MA1
3
BUS BUS BUS BUS BUS BUS BUS BUS
BUS BUS BUS BUS BUS BUS
3
12p
BUS
2
2
12m
DCF/AF
12
1
10i
10f
8a
8g
9j
9h
2
12b
UV1 3
9g
B A
BUS BUS
BUSBUS
7h
3
MA1
8g
9j 9h
7
10e 10e
BUS
BUS
BUS BUS BUS BUS BUS
2a 230 V~ 3
9r
9r
7
16
230 V~ 317
11
HOT WATER OUTLET
5
12K
12l
8e
MAINS INLET
8c
SEC. CIRCULATION
3e 3
210c
SP1
MA2

19
POST BFR

DHW CYL
3
12m
DHW / HTG
HEX. MODULE
24V=
S21
24V=
S20
BUS
- +
X206
X200
NL3L2L1
0 ...24 V 230 V~
Heat Pump
2a
230 V~
12p 12
3
230 V~ 0 ...24 V
EVU
2 1
VF1 SP1
2 1
ME
2 1
DCF/AF
AF IO DCF
BUS
- +
2 1N 1 2
ZH
N
UV1
Auf Zu
MA2
N L
MA1
N L
230V~
N L
230V~
N L
EVU
ME
DCF / AF
SP1
VF1
BUS
ZH
UV1
MA2
MA1
230 V~
230 V~
230 V~
12b Heatpump Interface
SEC. CIRC.

20
aroTHERM plus with DHW Cylinder, HEX. Module, Decoupler, 1 Radiator Zone
Setting Value
Installation
Adapt. heat curve Deactivated
Hybrid manager Bivalence pt.
Heating bivalence point -20o
DHW bivalence point -20o
Alternative point Off
ESCO Heating off
Back-up boiler Off
Basic system diagram conguration
Basic system diagram code 10
HP control module conguration
MO 2 Circ. pump
Circuit 1
Circuit type Heating
OT switch-off threshold 30o
Heat curve **Site specic
Min. target ow temp. 15o
Max. target ow temp. 45o
Set-back mode Normal
Room temp. mod. Expanded
Zone 1
Zone activated Yes
Zone assignment Control
Domestic hot water
Cylinder Active
Anti-legio. day **User pref.
Anti-legio. time **User pref.
Cylinder charging offset 15 K
Cyl. charg. anti-cycl. time 5 min