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~
For applicability, see the last page
VITOCAL 350-A
5692 878 GB 7/2010 Please keep safe.

2
Please follow these safety instructions closely to prevent accidents and mate-
rial 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 envi-
ronmental pollution.
Note
Details identified by the word "Note" con-
tain additional information.
Target group
These instructions are exclusively
designed for qualified personnel.
■ 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
Observe the following when working on
this system
■ National installation requirements
■ All legal instructions regarding the pre-
vention of accidents,
■ All legal instructions regarding envi-
ronmental protection,
■ The Code of Practice of relevant trade
associations
■ All current safety regulations as
defined by DIN, EN, DVGW, VDE and
all locally applicable standards
aÖNORM, EN and ÖVE
cSEV, SUVA, SVTI and SWKI
Working on the system
■ Isolate the system from the power sup-
ply and check that it is no longer 'live',
e.g. by removing the separate fuse or
by means of a main isolator.
Note
In addition to the control circuit, there
may be several power circuits.
■ Safeguard the system against unau-
thorised reconnection.
!Please note
Electronic modules can be dam-
aged by electrostatic dis-
charges.
Before beginning work, touch
earthed objects, such as heating
or water pipes, to discharge static
loads.
Safety instructions
Safety instructions
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Repair work
!Please note
Repairing components that fulfil a
safety function can compromise
the safe operation of your sys-
tem.
Replace faulty components only
with original 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 function. Installing non-author-
ised components and making
non-approved modifications or
conversions can compromise
safety and may invalidate our
warranty.
For replacements, use only orig-
inal spare parts supplied or
approved by Viessmann.
Safety instructions
Safety instructions (cont.)
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Installation instructions
Preparing for installation
Product information.............................................................................................. 6
General information - electrical connection.......................................................... 6
Internal heat pump type AWHI 351.A................................................................... 7
External heat pump type AWHO 351.A................................................................ 14
Overview of possible system diagrams................................................................ 25
System example 1, ID: 4605306_1006_01.......................................................... 26
System example 2, ID: 4605095_1005_02.......................................................... 33
DHW heating........................................................................................................ 40
Installation sequence
Removing the transport brackets......................................................................... 44
Fitting the outer panels......................................................................................... 46
Fitting silencer hoods (only type AWHO 351.A)................................................... 53
Installing the heat pump....................................................................................... 54
Connecting the heating circuits and condensate drain........................................ 57
Electrical connections in the control panel........................................................... 61
Electrical connections in the heat pump control unit............................................ 70
Power supply........................................................................................................ 99
Closing the heat pump......................................................................................... 109
Service instructions
Commissioning, inspection, maintenance
Steps - commissioning, inspection and maintenance.......................................... 111
Further details regarding the individual steps....................................................... 112
Troubleshooting
Repairs................................................................................................................. 126
Parts lists
Parts list type AWHI 351.A................................................................................... 129
Parts list type AWHO 351.A................................................................................. 136
Commissioning/service reports
Hydraulic parameters report................................................................................. 143
Control parameter report...................................................................................... 143
Specification....................................................................................................... 149
Appendix
Heat pump commissioning order.......................................................................... 153
Index
Index
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Certificates
Declaration of conformity...................................................................................... 154
Keyword index.................................................................................................... 155
Index
Index (cont.)
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Vitocal 350-A, AWHI 351.A, AWHO 351.A
Air/water heat pump without integral circulation pump (secondary pump) and without
3-way diverter valve. A secondary pump assembly (secondary pump and circulation
pump for cylinder heating) is available as an accessory.
The four red wires in the heat pump control unit must be removed for the external
circulation pumps to be connected (see page 74).
General information - electrical connection
■Connecting cable control panel –
heat pump control unit:
Observe information from page 61.
■Electrical connection of system
components (pumps, mixer, valves,
message facilities, contactors, func-
tion extensions, sensors etc.):
Connection is made inside the heat
pump control unit. Observe informa-
tion from page 70.
■Power supply:
The number of power cables from the
meter cupboard to the heat pump con-
trol unit and to the control panel
depends on the system equipment
level and the applicable tariffs.
Connection is made inside the heat
pump control panel. Observe informa-
tion from page 99.
Preparing for installation
Product information
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Installation room requirements
!Please note
Incorrect ambient conditions can
lead to system damage and can
put the safe operation at risk.
■ The installation room must be
dry and free from the risk of
frost.
Safeguard ambient tempera-
tures above 0 ºC and below
35 ºC.
■ Prevent air contamination by
halogenated hydrocarbons
(e.g. as contained in paints,
solvents or cleaning fluids) and
excessive dust (e.g. through
grinding/polishing work).
■ Avoid continuously high humid-
ity levels (e.g. through frequent
drying of washing).
!Please note
Overloading the floor can result in
building damage.
Observe the permissible floor
load.
■ Total weight:
AWHI 351.A10 287 kg
AWHI 351.A14 297 kg
AWHI 351.A20 361 kg
■ To prevent structure-borne noise,
never set up the appliance on ceilings
with wooden joists (e.g. in the attic).
■ Observe minimum clearances.
■ Level the appliance.
■ Required room height at least 2.10 m.
■ Observe the required minimum room
volume according to EN 378:
AWHI 351.A10 13.55 m3
AWHI 351.A14 16.13 m3
AWHI 351.A20 17.10 m3
Note
During defrosting, cool vapour escapes
from the air duct discharge. This must be
taken into consideration when position-
ing the appliance (selection of installa-
tion room, determination of intake and
discharge side).
Preparing for installation
Internal heat pump type AWHI 351.A
5692 878 GB
Installation

8
Positioning
Minimum clearances and dimensions when positioning in a corner
Note
Prior to breaking out wall outlets, check the static data of the building and the wall
concerned. If necessary, install a lintel.
For corner installation (l.h. or r.h. discharge), the wall outlets are the same size.
BA
1330
532
1330
935
c
830
990
g
D
C
AWall outlet, discharge side
BWall outlet, intake side
CInternal render/plaster
DTop edge, finished floor
Preparing for installation
Internal heat pump type AWHI 351.A (cont.)
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BA
CDE
F
G
C
E
D
≥ 700
80
810a
b
c
h
532
127 117
810
686
80
d
Discharge on the left
AExternal rendering
BWall
CWall outlet (can be trimmed to the
correct size from the outside with a
saw. Observe plaster thickness)
DCompression sealing strip and
acrylic airtight seam (all-round)
EPU foam (all-round)
FPlaster finish/wall coating
GHydraulic and condensate connec-
tions
Dimensions Vitocal 350-A, type
AWHI 351.A10 AWHI 351.A14 AWHI 351.A20
a mm 95 85 107
b mm 118 182 284
c mm 522 588 686
d mm 367 217 64
e mm 489 489 472
g mm 880 1020 1180
h mm 845 995 1148
Preparing for installation
Internal heat pump type AWHI 351.A (cont.)
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Installation

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Minimum clearances and dimensions when positioning against a wall
885
885
= 8 x 350
= 1 x 350
686
80
990
h
835
g
X
830
810
350
966
Discharge side on the left (delivered condition); hydraulic connections on the right
(on site)
AWall outlet on the discharge side
(made from EPP)
BWeather grille
CPartition wall (if required), see the
following table
DWall outlet on the intake side
(made from EPP)
EAppliance connector, air duct on
the intake side (made from EPP)
FHeat pump
GAppliance connector, air duct on
the discharge side (made from
EPP)
HStraight wall outlets as air ducts
(made from EPP)
K90° bend (made from EPP)
X Clearance between wall outlets
EPP Expanded polypropylene
Preparing for installation
Internal heat pump type AWHI 351.A (cont.)
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Number of
duct parts
Overall length, duct
parts in mm
Clearance X in mm Requires partition
wall C
1 350 650 Yes
2 700 1000 Yes
3 1050 1350 Yes
4 1400 1700 Yes
5 1750 2050 Yes
6 2100 2400 Yes
7 2450 2750 Yes
8 2800 3100 No
9 3150 3450 No
10 3500 3800 No
Dimensions Vitocal 350-A, type
AWHI 351.A10 AWHI 351.A14 AWHI 351.A20
g mm 880 1020 1180
h mm 845 995 1148
Preparing for installation
Internal heat pump type AWHI 351.A (cont.)
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Installation

12
Connections
b
95
c
a
946
1870
639
946
111
218
327
435
Note
Hydraulic pipes, cables and condensate drain can be routed out of the heat pump to
the left or right.
ACable entries
BHeating water return/DHW cylinder
return (see page 57)
CCondensate drain
DHeating water flow/DHW cylinder
flow (see page 57)
Preparing for installation
Internal heat pump type AWHI 351.A (cont.)
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Dimensions Vitocal 350-A, type
AWHI 351.A10 AWHI 351.A14 AWHI 351.A20
a mm 489 489 472
b mm 367 217 64
c mm 880 1030 1200
Cables/leads
A
C
D
G
E
H
F
K
B
AHeat pump control unit
BPower cable for heat pump control
unit 230 V/50 Hz
Recommended cable: 3 x 1.5 mm2
(5 x 1.5 mm2 with power-OFF)
CConnecting cables for additional
components and functions (e.g.
pumps, sensors, fault messages
etc.)
DTwo connecting cables, fully wired
(5, 15 or 30 m):
■Control cable 230 V~
■Low voltage cable < 42 V
EPower cable for compressor/fan
(400 V/50 Hz; 3/N/PE)
Recommended cable: 5 x 2.5 mm2,
flexible
FPower cable, instantaneous heating
water heater (if installed), max. out-
put 9 kW
Recommended cable:
400 V/50 Hz; 3/N/PE: 5 x 2.5 mm2,
flexible
230 V/50 Hz; 1/N/PE: 7 x 2.5 mm2,
flexible
GInstantaneous heating water heater
(accessory)
HControl panel
KInternal heat pump
Preparing for installation
Internal heat pump type AWHI 351.A (cont.)
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Installation

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Required cable lengths:
■ For the heat pump control unit (cable
wall outlet centrally directly below the
heat pump control unit):
0.6 m from wall outlet
■ Inside the heat pump (to the control
panel):
3.4 m plus wall clearance for cable
entry from the left
3.4 m plus wall clearance minus appli-
ance width for cable entry from the
right
External heat pump type AWHO 351.A
Positioning requirements
■ Provide a manual drain of the heating
water flow and return lines in any area
at risk from frost.
If the heat pump control unit and heat-
ing circuit pump are ready for opera-
tion, the frost protection function of the
heat pump control unit is enabled.
Drain the system if the heat pump is
shut down or there is a prolonged
power failure.
On heat pump systems where a power
failure cannot be recognised (holiday
home), operate the heating circuit with
a suitable antifreeze or drain it.
■ To prevent air "short circuits" and
higher sound emissions through
reflection, avoid installing the equip-
ment in recesses, on building corners
or between two walls. Lawn areas and
vegetation can reduce noise develop-
ment.
Only the heat pump foundations
should therefore be made from rever-
berative material (concrete).
■ Never install the heat pump next to liv-
ing rooms or bedrooms.
■ The air in the outlet section is approx.
10 K colder than the ambient air.
Therefore, black ice could develop in
the outlet area even at [ambient] tem-
peratures above freezing. Clearance
towards paths or patios ≥ 3 m.
Note
During defrosting, cool vapour escapes
from both air discharge apertures of the
heat pump. This must be taken into con-
sideration when positioning the appli-
ance (selection of installation location,
heat pump orientation).
Preparing for installation
Internal heat pump type AWHI 351.A (cont.)
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Positioning
Minimum clearances
1500
1200
1200
1500
Foundations
Position the heat pump horizontally on a
permanently solid surface. We recom-
mend laying concrete foundations as
shown in the following diagrams.
■ Provide an adequately dimensioned
recess (see the following diagram) in
the foundations for the lines (heating
water flow and return, cables and con-
densate drain) to be introduced into
the heat pump from below.
■ The foundations, supporting surface
and cable ducts must be designed to
prevent rodents from entering the heat
pump and the cable ducts.
■ The condensate generated by the air
(subject to temperature and relative
humidity up to 20 litres/h) must be
drained off via a drain line DN 40
(stainless steel) with a constant slope.
If possible connect the condensate
drain to a drainage or sewer system.
In this case, provide a siphon with a
water level of at least 60 mm in the
frost-protected area.
Where the ground is able to absorb
water, the condensate can be soaked
away down to a frost-free depth into a
gravel bed.
■ Where required, thermally insulate the
condensate hose on site to protect it
from frost; alternatively provide a sup-
plementary heating facility.
Technical guide
Preparing for installation
External heat pump type AWHO 351.A (cont.)
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Installation

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Vitocal 350-A, type Weight (with
silencer
hoods)
AWHO 351.A10 325 kg
AWHO 351.A14 335 kg
AWHO 351.A20 400 kg
Preparing for installation
External heat pump type AWHO 351.A (cont.)
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Foundation dimensions
D D
C
BA
E F G
H
100 400
100
400
100
1300
100
1150
300
250
390320
b
315
340
75
145
240
a
Plan view of the foundations
Preparing for installation
External heat pump type AWHO 351.A (cont.)
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Installation

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AInstallation area of the heat pump on
concrete foundations
BConcrete foundations, consisting of:
■ Concrete plate C25/30,
BSt 500 S and M
■ Reinforcement with all-round wire
mesh made of Q 257 A
Observe local requirements and the
standard rules of building engineer-
ing, as well as the spot loads
through adjustable feet.
CFront of the heat pump
DSoft ground, gravel or crushed stone
EFoundation recess for routing the
lines for heating water flow and
return, condensate drain and elec-
tric cables/leads (low voltage and
control cables) as well as the power
cable to the control panel
FLine outlet for heating water flow
and return
GKG conduit DN 100 for connecting
cables (LV and control cables) and
power cable to the control panel
HCondensate drain DN 40
Vitocal 350-A, type Dimen
sion a
in mm
Dim. b
in mm
AWHO 351.A10 1080 195
AWHO 351.A14 1230 195
AWHO 351.A20 1400 195
Preparing for installation
External heat pump type AWHO 351.A (cont.)
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Connection dimensions, hydraulic connection set in the foundations
37
400
8
≈500
≥900
≈300
400
/
AConcrete foundations as previously
described and according to local
requirements and in accordance
with the standard rules of building
engineering
BFrost protection (compacted
crushed stone, e.g. 0 to 32/56 mm),
thickness of layer subject to local
requirements and building rules
CHydraulic connection set (heating
water flow and return)
DSoft ground, gravel or crushed stone
EConnecting cables (LV and control
cables) and power cable to the con-
trol panel
FCondensate drain
Note
Before laying the concrete foundations,
trim the hydraulic connection pipes
(heating water flow and return), install
the connection fittings and provide frost
protection.
Preparing for installation
External heat pump type AWHO 351.A (cont.)
5692 878 GB
Installation

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Connections
1264
g
f
h
946
1885
e
946
Side view, shown without silencer hood.
Note
Openings for electric cables/leads are cut on site into the insulation mat in the bottom
panel (see page 66).
Preparing for installation
External heat pump type AWHO 351.A (cont.)
5692 878 GB