Viessmann VITOCAL 350-A Quick guide

Installation and service instructions
for contractors
VIESMANN
Vitocal 350-A
Type AWHI 351.A
Type AWHO 351.A
Air/water heat pump with electric drive, 400 V~
VITOCAL 350-A
5692878 GB 11/2019 Please keep safe.

2
Please follow these safety instruc-
tions closely to prevent accidents
and material losses.
Safety instructions explained
Danger
This symbol warns against the risk
of injury.
!Please note
This symbol warns against the risk
of material losses and environmen-
tal pollution.
Note
Details identified by the word "Note"
contain additional information.
Target group
These instructions are exclusively inten-
ded for authorised contractors.
■Work on the refrigerant circuit may only
be carried out by authorised refrigera-
tion engineers.
■Work on electrical equipment must
only be carried out by a qualified elec-
trician.
■The system must be commissioned by
the system installer or a qualified per-
son authorised by the installer.
Regulations to be observed
■National installation regulations
■Statutory regulations for the prevention
of accidents
■Statutory regulations for environmental
protection
■Codes of practice of the relevant trade
associations
■Relevant country-specific safety regu-
lations
Safety instructions
Safety instructions
5692878

3
Safety instructions for working on the system
Working on the system
■Isolate the system from the power sup-
ply, e.g. by removing the separate fuse
or by means of a mains isolator, and
check that it is no longer live.
Note
In addition to the control circuit there
may be several power circuits.
Danger
Contact with live components can
result in severe injuries. Some
components on PCBs remain live
even after the power supply has
been switched off.
Prior to removing covers from the
appliances, wait at least 4 minutes
until the voltage has completely
dropped out.
■Safeguard the system against recon-
nection.
■Wear suitable personal protective
equipment when carrying out any work.
Danger
Hot surfaces and fluids can lead to
burns or scalding.
■Before maintenance and service
work, switch OFF the appliance
and let it cool down.
■Never touch hot surfaces on the
appliance, fittings or pipework.
!Please note
Electronic assemblies can be dam-
aged by electrostatic discharge.
Prior to commencing work, touch
earthed objects such as heating or
water pipes to discharge static
loads.
Repair work
!Please note
Repairing components that fulfil a
safety function can compromise the
safe operation of the system.
Replace faulty components only
with genuine Viessmann spare
parts.
Auxiliary components, spare and
wearing parts
!Please note
Spare and wearing parts that have
not been tested together with the
system can compromise its func-
tion. Installing non-authorised com-
ponents and making non-approved
modifications or conversions can
compromise safety and may invalid-
ate our warranty.
For replacements, use only original
spare parts supplied or approved by
Viessmann.
Safety instructions for operating the system
What to do if water escapes from the
appliance
Danger
If water escapes from the appliance
there is a risk of electric shock.
Switch off the heating system at the
external isolator (e.g. fuse box,
domestic distribution board).
Danger
If water escapes from the appliance
there is a risk of scalding.
Never touch hot heating water.
Safety instructions
Safety instructions (cont.)
5692878

4
1. Information Disposal of packaging ............................................................................ 6
Symbols ................................................................................................. 6
Intended use .......................................................................................... 6
Product information ................................................................................ 7
■System examples ............................................................................... 7
■Spare parts lists .................................................................................. 7
2. Installation preparations
for heat pumps installed
indoors
Requirements for on-site connections: Type AWHI 351.A ..................... 8
■Cables/leads ....................................................................................... 9
Requirements for transport and siting: Type AWHI 351.A ..................... 9
■Transport ............................................................................................ 9
■Installation room requirements ........................................................... 9
■Minimum clearances and dimensions for corner installation .............. 11
■Minimum clearances and dimensions for wall installation .................. 13
3. Installation preparations
for heat pumps installed
outdoors
Requirements for on-site connections: Type AWHO 351.A ................... 16
Requirements for transport and siting: Type AWHO 351.A ................... 17
■Transport ............................................................................................ 17
■Installation site requirements .............................................................. 17
■Requirements for the heat pump control unit installation location ...... 17
■Minimum clearances ........................................................................... 18
Foundations: Type AWHO 351.A ........................................................... 18
■Foundation dimensions ...................................................................... 18
Cables/leads and hydraulic lines: Type AWHO 351.A ........................... 21
■Laying cables/lines underground and routing in through the exterior
wall ..................................................................................................... 21
■Required cables and hydraulic lines ................................................... 23
4. Installation sequence Removing the transport brackets ........................................................... 24
Type AWHI 351.A only: Fitting the supplied floor mat ........................... 25
Fitting the outer panels .......................................................................... 26
Type AWHO 351.A only: Fitting the silencer hoods ............................... 31
Fitting the top panel ............................................................................... 32
Siting the heat pump .............................................................................. 32
■Only type AWHI 351.A: Connecting the air circuit (primary circuit) .... 32
■Levelling the heat pump ..................................................................... 32
Making the hydraulic connections .......................................................... 34
■Heat pump installed indoors ............................................................... 35
■Heat pump installed outdoors ............................................................. 36
Electrical connections: Control panel ..................................................... 37
■Opening the control panel .................................................................. 37
■Overview of electrical connections in the control panel ...................... 38
■Routing cables/leads to the control panel ........................................... 39
■Attaching the connecting cables from the control unit in the control
panel ................................................................................................... 41
Electrical connections: Heat pump control unit ...................................... 44
■Fitting the heat pump control unit and inserting cables ...................... 44
■Attaching cables from the control panel in the control unit ................. 48
■Adjusting the heat pump control unit (red cores) ................................ 48
■Inserting the coding card .................................................................... 51
■Overview of electrical connections ..................................................... 51
■Main PCB (operational components 230 V~) ..................................... 52
■Expansion PCB on main PCB (operational components 230 V~) ...... 55
■Cross connect PCB ............................................................................ 58
■Controller and sensor PCB (sensors) ................................................. 60
Power supply ......................................................................................... 64
■Heat pump control unit power supply 230 V~ ..................................... 65
■Compressor power supply (400 V~), sealing economy tariff connec-
tion for compressor ............................................................................. 65
Index
Index
5692878

5
■Power supply with power-OFF: Without on-site load disconnect ....... 66
■Power supply with power-OFF: With on-site load disconnect ............ 66
■Phase monitor (if installed) ................................................................. 67
Closing the heat pump ........................................................................... 69
■Closing the control panel .................................................................... 70
■Fitting the front panel .......................................................................... 71
5. Commissioning, inspec-
tion, maintenance
Steps - commissioning, inspection and maintenance ............................ 72
6. Troubleshooting Repairs .................................................................................................. 85
■Overview of sensors, drain and air vent valves .................................. 85
■Draining the heat pump on the secondary side .................................. 85
■Checking the temperature sensors ..................................................... 85
■Check fuses ........................................................................................ 86
7. Commissioning/service
reports
Hydraulic parameter report .................................................................... 87
Control parameter report ....................................................................... 87
8. Specification Specification .......................................................................................... 91
Sound transmission data ....................................................................... 95
9. Appendix Heat pump commissioning order ........................................................... 96
10. Certificates Declaration of conformity ....................................................................... 97
11. Keyword index ................................................................................................................ 98
Index
Index (cont.)
5692878

6
Please dispose of packaging waste in line with statu-
tory regulations.
Symbols
Symbol Meaning
Reference to other document containing
further information
1.
Step in a diagram:
The numbers correspond to the order in
which the steps are carried out.
Warning of material losses and environ-
mental pollution
Live electrical area
Pay particular attention.
■Component must audibly click into place.
or
■Acoustic signal
■Fit new component.
or
■In conjunction with a tool: Clean the sur-
face.
Dispose of component correctly.
Dispose of component at a suitable collec-
tion point. Do not dispose of component in
domestic waste.
The steps in connection with commissioning, inspec-
tion and maintenance are found in the "Commission-
ing, inspection and maintenance" section and identified
as follows:
Symbol Meaning
Steps required during commissioning
Not required during commissioning
Steps required during inspection
Not required during inspection
Steps required during maintenance
Not required during maintenance
Intended use
The appliance is only intended to be installed and
operated in sealed unvented heating systems that
comply with EN 12828, with due attention paid to the
associated installation, service and operating instruc-
tions.
Depending on the version, the appliance can only be
used for the following purposes:
■Central heating
■Central cooling
■DHW heating
The range of functions can be extended with additional
components and accessories.
Intended use presupposes that a fixed installation in
conjunction with permissible, system-specific compo-
nents has been carried out.
Commercial or industrial usage for a purpose other
than central heating/cooling or DHW heating shall be
deemed inappropriate.
Information
Disposal of packaging
5692878
Information

7
Incorrect usage or operation of the appliance (e.g. the
appliance being opened by the system user) is prohibi-
ted and will result in an exclusion of liability. Incorrect
usage also occurs if the components in the heating
system are modified from their intended function.
Note
The appliance is intended exclusively for domestic or
semi-domestic use, i.e. even users who have not had
any instruction are able to operate the appliance
safely.
Product information
Layout
The Vitocal 350-A is an air source heat pump with out-
put-dependent control.
Type AWHI 351.A is installed inside the building. Air
drawn in is supplied to the heat pump via an air duct.
Expelled air similarly leaves the building via an air
duct.
Type AWHO 351.A is installed outside the building.
The hydraulic connection lines are routed below
ground and must be frost-proof.
Hydraulics
To supply the secondary circuit, either two circulation
pumps (secondary pump and circulation pump for cyl-
inder heating) or 1 secondary pump and a 3-way
diverter valve are connected.
With type AWHI, the secondary pump can be built into
the heat pump. The remaining components are instal-
led outside the appliance.
With type AWHO, the hydraulic components for sup-
plying the secondary circuit are installed outside the
heat pump.
Central heating
The heat pump is able to supply up to 3 heating cir-
cuits: 1 heating circuit without mixer and 2 heating cir-
cuits with mixer. The mixer extension kit (accessories)
is required to control the mixer for the second heating
circuit with mixer.
Central cooling
Central cooling results either through a heating/cooling
circuit or via a separate cooling circuit. For this, the
refrigerant circuit is reversed and heat is extracted
from the cooling circuit.
Heat pump control unit
The entire heating system is monitored and controlled
by the integral Vitotronic 200, type WO1B heat pump
control unit.
System examples
Available system examples: See www.viessmann-
schemes.com.
Spare parts lists
Information about spare parts can be found at
www.viessmann.com/etapp or in the Viessmann
spare part app.
Information
Intended use (cont.)
5692878
Information

8
D
B
C
A
B
D
A
C
b
95
d
a
946
1870
655
790
115
220
330
440
946
c
Fig. 1 Dimensions excluding casing panels:
790 mm x c
ACable entries
BHeating water return/DHW cylinder return G 1½
(female thread)
CCondensate drain
DHeating water flow/DHW cylinder flow G 1½
(female thread)
Notes
■Air discharge either on the left or right
■Hydraulic lines and condensate drain can be routed
from the heat pump from the left or right. Installation
always opposite the air discharge.
■The connecting hoses can be shortened. The stated
dimensions a and b are for hose lengths in the deliv-
ered condition.
Dimensions in mm
Type a b c d
AWHI
351.A10
489 367 880 891
AWHI
351.A14
489 217 1030 1041
AWHI
351.A20
472 64 1200 1211
Installation preparations for heat pumps installed indoors
Requirements for on-site connections: Type AWHI 351.A
5692878
Installation

9
Cables/leads
E
L
A
F
K
D
CB
M
H
G
Q
P
N
R
Fig. 2
AHeat pump
BExtra low voltage (ELV) lead, pre-manufactured
CControl cable, pre-manufactured
DFlexible power cable (special tariff/load current):
According to compressor output, cable length and
routing, e.g. 5 x 2.5 mm2.
EOutside temperature sensor, sensor lead:
2 x 0.75 mm2
FControl unit, flexible power cable: 5 x 1.5 mm2 with
power-OFF contact, floating
GElectricity meter/mains
HDHW cylinder
KCylinder temperature sensor, sensor lead:
2 x 0.75 mm2
LDHW circulation pump, power cable: 3 x 1.5 mm2
MFlexible power cable for instantaneous heating
water heater (accessories):
400 V: 5 x 2.5 mm2
230 V: 7 x 2.5 mm2
NHeating water buffer cylinder
PSecondary pump, power cable: 3 x 1.5 mm2
QHeating circuit pump
RBuffer temperature sensor, sensor lead:
2 x 0.75 mm2
Required cable lengths:
■For the heat pump control unit (wall outlet for the
cables positioned centrally, directly below the heat
pump control unit):
0.6 m from the wall outlet
■Inside the heat pump (to the control panel):
3.4 m plus wall clearance
■Connecting cables from control panel – heat
pump control unit:
Observe the information on page 37 onwards.
■Electrical connection of system components
(pumps, mixers, valves, message facilities, contac-
tors, function extensions, sensors etc.):
Connections are made in the heat pump control unit.
Observe the information on page 44 onwards.
■Power supply:
The number of power cables from the distribution
board (meter box) to the heat pump control unit and
the control panel depends on the system version and
tariffs used.
Connections are made in the heat pump control
panel. Observe the information on page 64
onwards.
Requirements for transport and siting: Type AWHI 351.A
Transport
!Please note
Impacts, compression and tensile loads can
cause damage to the outside panels of the
appliance.
Never put weight on the top, front or side panels
of the appliance.
!Please note
Tilting the compressor at a steep angle inside
the heat pump can result in appliance damage.
Max. tilting angle: 45° for a very short time
Installation room requirements
!Please note
Unfavourable ambient conditions can lead to
malfunctions and appliance damage.
■The installation room must be dry and free
from the risk of frost.
■Ensure ambient temperatures between
0 and 35 °C.
Danger
Dust, gases and vapours can be damaging to
health and trigger explosions.
Avoid dust, gases and vapours in the installation
room.
Installation preparations for heat pumps installed indoors
Requirements for on-site connections: Type AWHI 351.A (cont.)
5692878
Installation

10
!Please note
Overloading the floor can result in damage to
the building structure.
Observe the permissible floor load. Take the
total weight of the appliance into account.
Total weight
AWHI 351.A10 287 kg
AWHI 351.A14 297 kg
AWHI 351.A20 361 kg
Sound transmission
■To prevent the transmission of structure-borne noise,
site the appliance on a solid concrete floor or con-
crete plinth.
■Never install the heat pump next to living rooms or
bedrooms.
Minimum room height
■Min. required room height 2.10 m
Minimum room volume (to EN 378):
AWHI 351.A10 13.55 m3
AWHI 351.A14 16.13 m3
AWHI 351.A20 17.10 m3
Intake and discharge side
■The air in the discharge area is approx. 10 K colder
than the ambient air. Black ice can therefore develop
in the discharge area even at ambient temperatures
above freezing.
■During defrosting, cool vapour escapes from the air
duct on the discharge side.
■Minimum distance of the intake and discharge side
to pathways or patios: 3 m
Installation preparations for heat pumps installed indoors
Requirements for transport and siting: Type AWHI 351.A (cont.)
5692878
Installation

11
Minimum clearances and dimensions for corner installation
Note
■Before making the wall openings, check the struc-
tural analysis of the building and the wall. If neces-
sary, fit a support.
■For corner installation (discharge on the left or right),
the wall outlets are the same size.
■All specified dimensions are finished dimensions.
Dimensions of wall openings
BA
1330
532
1330
935
c
830
990
g
D
C
Fig. 3 Discharge side on the left (delivered condi-
tion); hydraulic connections on the right (on
site)
AWall opening, discharge side
BWall opening, intake side
CPlaster finish/wall coating
DTop edge, finished floor level
Dim. Vitocal 350-A, type AWHI
351.A10 351.A14 351.A20
c mm 522 588 689
g mm 880 1020 1180
Installation preparations for heat pumps installed indoors
Requirements for transport and siting: Type AWHI 351.A (cont.)
5692878
Installation

12
Wall clearances
Discharge side on the left Discharge side on the right
K
M
G
B
AD E F
H
N
D
F
E
80
810
a
b
c
532 127
117
810
686
80
d
700
h
500
K
M
GBA
D
E
F
H
N
D
F
E
80
810 a
b
c
532
127
117
810
686
80
e
700
h
600
AExterior rendering
BWall
DWall duct (EPP, can be trimmed to the correct size
from the outside with a saw. Observe plaster thick-
ness!)
ECompression sealing strip and acrylic airtight seam
(all-round)
FPU foam (all-round)
GAppliance connector, air duct on the intake side
(EPP)
HPlaster finish/wall coating
KHydraulic and condensate connections
MHeat pump
NAppliance connector, air duct on the discharge
side (EPP)
Dim. Vitocal 350-A, type AWHI
351.A10 351.A14 351.A20
a mm 95 85 107
b mm 118 182 284
c mm 522 588 689
d mm 367 217 64
e mm 489 489 472
g mm 880 1020 1180
h mm 845 995 1148
Installation preparations for heat pumps installed indoors
Requirements for transport and siting: Type AWHI 351.A (cont.)
5692878
Installation

13
Minimum clearances and dimensions for wall installation
Dimensions of wall openings
990
gX830
Q
1330
Fig. 4
QPartition wall (if required): See table on pages
14 and 15
X Distance between wall openings inside the building
Dim. Vitocal 350-A, type AWHI
351.A10 351.A14 351.A20
g mm 880 1020 1180
Installation preparations for heat pumps installed indoors
Requirements for transport and siting: Type AWHI 351.A (cont.)
5692878
Installation

14
Wall clearances
E
127.5
885N x 350
810
830
Y
X
g
830
240
80
A B E F G
H
KM
N P
e
Q
D
F
DD
Fig. 5
AExterior rendering
BWall
DWall duct (EPP, can be trimmed to the correct size
from the outside with a saw. Observe plaster thick-
ness!)
ECompression sealing tape and acrylic airtight
seam (all-round)
FPU foam (all-round)
GAppliance connector, air duct on the intake side
(EPP)
HPlaster finish/wall coating
KHydraulic and condensate connections
MHeat pump
NAppliance connector, air duct on the discharge
side (EPP)
PAir duct 90° bend
QPartition wall (if required): See table on pages 14
and 15.
N Number of duct parts (wall ducts)
X Distance between wall openings inside the building
Y Distance between wall openings outside the build-
ing
Dim. Vitocal 350-A, type AWHI
351.A10 351.A14 351.A20
e mm 489 489 472
g mm 880 1020 1180
Distances between wall openings X and Y in mm
N Vitocal 350-A, type AWHI Partition wall Q
required
351.A10 351.A14 351.A20
X Y X Y X Y
1 655 680 660 755 665 840 Yes
2 1005 1030 1010 1105 1015 1190 Yes
3 1355 1380 1360 1455 1365 1540 Yes
4 1705 1730 1710 1805 1715 1890 Yes
5 2055 2080 2060 2155 2065 2240 Yes
6 2405 2430 2410 2505 2415 2590 Yes
7 2755 2780 2760 2855 2765 2940 Yes
8 3105 3130 3110 3205 3115 3290 No
9 3455 3480 3460 3555 3465 3640 No
10 3805 3830 3810 3905 3815 3990 No
Installation preparations for heat pumps installed indoors
Requirements for transport and siting: Type AWHI 351.A (cont.)
5692878
Installation

15
Partition wall
Air intake/air discharge via weather grille Air intake/air discharge via light well
h
A
D
B
B
h
C
≥ 1000
≥ h +500
Fig. 6
ADischarge side
BWeather grille
CPartition wall
DIntake side
h Height to the top edge of the weather grille
≥1000
≥ 1000
D
A
K
C
K
Fig. 7
ADischarge side
CPartition wall
DIntake side
KLight well
Installation preparations for heat pumps installed indoors
Requirements for transport and siting: Type AWHI 351.A (cont.)
5692878
Installation

16
i
1265
g
f
h
957
1885
e
946
A
B
C
D
D
Fig. 8
ACondensate drain
BHeating water flow G 1¼ (female thread):
Adaptor G 1¼ to Rp 1 supplied
CHeating water return G 1¼ (female thread):
Adaptor G 1¼ to Rp 1 supplied
DSilencer hoods
Dimensions in mm
Type e f g h i
AWHO
351.A10
655 456 500 1380 891
AWHO
351.A14
655 606 650 1530 1041
AWHO
351.A20
655 754 798 1700 1211
Installation preparations for heat pumps installed outdoors
Requirements for on-site connections: Type AWHO 351.A
5692878
Installation

17
Transport
The appliance can be lifted onto the foundations with,
for example, a crane and on-site equipment.
!Please note
Lifting by screw-in lifting eyes causes appliance
damage.
■Do not attach lifting eyes to the heat pump.
■Lift the heat pump with 2 or 4 transport straps.
Route opposite loops around the upper frame.
■Ensure even load distribution.
!Please note
Impacts, compression and tensile loads can
cause damage to the outside panels of the
appliance.
Never put weight on the top, front or side panels
of the appliance.
!Please note
Tilting the compressor at a steep angle inside
the heat pump can result in appliance damage.
Max. tilting angle: 45° for a very short time
Installation site requirements
The heat pump may only be sited outside the build-
ing on solid foundations: See page 18.
■Provide a manual drain for the heating water flow
and return lines in any area at risk from frost.
If the heat pump control unit and heating circuit
pump are ready for operation, the frost protection
function of the heat pump control unit is active.
Drain the system if the heat pump is shut down or
there is a prolonged power failure.
In heat pump systems where a power failure may go
unnoticed (holiday home), operate the heating circuit
with a suitable antifreeze or drain it.
■To prevent "air short circuits" and an increase in
noise levels due to reflection, do not site the appli-
ance in recesses, at building corners or between 2
walls. Lawn areas and vegetation can reduce noise
generation.
Therefore, only the heat pump foundations should
be made from reverberant material (concrete).
■Never install the heat pump next to living rooms or
bedrooms.
■The air in the discharge area is approx. 10 K colder
than the ambient air. Black ice can therefore develop
in the discharge area even at ambient temperatures
above freezing. A clearance of ≥ 3 m must be
observed to pathways or patios.
■During defrosting, cool vapour escapes from the heat
pump air discharge vents. This vapour build-up must
be taken into consideration during installation
(choosing the installation location, orientation of the
heat pump).
Requirements for the heat pump control unit installation location
The heat pump control unit may only be installed
inside the building on a wall: See page 44.
!Please note
Unfavourable ambient conditions can lead to
malfunctions and appliance damage.
■The installation room must be dry and free
from the risk of frost.
■Ensure ambient temperatures between
0 and 35 °C.
Danger
Dust, gases and vapours can be damaging to
health and trigger explosions.
Avoid dust, gases and vapours in the installation
room.
Installation preparations for heat pumps installed outdoors
Requirements for transport and siting: Type AWHO 351.A
5692878
Installation

18
Minimum clearances
15001500
1200
1200
Fig. 9
Foundations: Type AWHO 351.A
Site the heat pump horizontally on a permanently solid
surface. We recommend laying concrete foundations
as shown in the following diagrams.
■Provide an adequately sized recess (see diagram
below) in the foundations to permit the lines (heating
water flow and return, cables and condensate drain)
to be brought into the heat pump from below.
■Design the foundations, supporting surface and
cable ducts so that small animals cannot get into the
heat pump or cable ducts.
■Drain all condensate derived from the air (subject to
temperature and relative humidity up to 20 l/h) via a
DN 40 drain pipe, which should be protected from
frost and provide a steady fall.
If possible connect the condensate drain to a drain-
age or sewer system. In this case, provide a siphon
with a backup level of at least 60 mm in the frost-pro-
tected area.
Where the ground is able to absorb water, the con-
densate can be soaked away down to a frost-free
depth into a gravel bed.
■Where appropriate, provide thermal insulation or a
ribbon heater around the condensate drain hose on
site.
Technical guide
Weight
Vitocal 350-A, type Weight (incl. silenc-
er hoods)
AWHO 351.A10 325 kg
AWHO 351.A14 335 kg
AWHO 351.A20 400 kg
Foundation dimensions
Provide appropriately sized recesses N in the founda-
tions for cables and pipes routed into the heat pump
from below (hydraulic connection set E, cables D
and condensate drain G): See diagram below.
Installation preparations for heat pumps installed outdoors
Requirements for transport and siting: Type AWHO 351.A (cont.)
5692878
Installation

19
Plan view
100 400
100
400
100
1300
100
1150
300
250
390
320
a
H H
LP AB
b
315
340
75
145
240
V E D
G
W
M
Fig. 10
AHeat pump
BConcrete foundations (300 mm thick) consisting of:
■Concrete slab C25/30, BSt 500 S and M
■Reinforcement with all-round Q 257 A wire mesh
DKG conduit DN 100 for connecting cables to the
heat pump control unit (on site):
Control cable 230 V~, extra low voltage (ELV) lead
< 42 V
EHydraulic connection set (accessories): Hydraulic
connection lines for heating water flow and heating
water return
GCondensate drain DN 40 (on site)
HSoft ground, gravel or crushed stone
LRouting direction of pipe from hydraulic connection
set: Towards the front
MHeat pump power cable
PUnderground channel
VRecess in the foundations for routing the lines for
heating water flow and return, the condensate
drain and the connecting cables (extra low voltage
(ELV) leads and control cables) as well as the
power cable to the control panel
WRouting direction of pipe from hydraulic connection
set: Towards the back
Installation preparations for heat pumps installed outdoors
Foundations: Type AWHO 351.A (cont.)
5692878
Installation

20
Dim. Vitocal 350-A, type AWHO
351.A10 351.A14 351.A20
a mm 1080 1230 1400
b mm 195 195 195
Sectional view
K
H
B
E
M
400
500
900
300
400
H
G
D
F
A
E
B
37
8
K
Fig. 11
AHeat pump
BConcrete foundations (300 mm thick) consisting of:
■Concrete slab C25/30, BSt 500 S and M
■Reinforcement with all-round Q 257 A wire mesh
DKG conduit DN 100 for connecting cables to the
heat pump control unit (on site):
Control cable 230 V~, extra low voltage (ELV) lead
< 42 V
EHydraulic connection set (accessories): Hydraulic
connection lines for heating water flow and heating
water return
GCondensate drain DN 40 (on site)
HSoft ground, gravel or crushed stone
KFrost protection (compacted crushed stone, e.g. 0
to 32/56 mm); thickness of layer subject to local
requirements and building regulations
MHeat pump power cable
Note
■Before laying the concrete foundations, trim the
hydraulic connection pipes (heating water flow and
return), install the connection fittings and provide
frost protection.
■The power cable may be routed freely up through the
foundation opening. What is important is spatial sep-
aration between the extra low voltage (ELV) lead and
the control cable.
Installation preparations for heat pumps installed outdoors
Foundations: Type AWHO 351.A (cont.)
5692878
Installation