Viessmann VITOCAL 300-G PRO Type BW 2150 Operating instructions

Installation and service instructions
for contractors
Viesmann
Vitocal 300-G Pro
Type BW 302.D090 to 302.D230, 84.8 to 222.0 kW
Brine/water heat pumps, 2-stage
VITOCAL 300-G PRO
5838144 GB 11/2018 Please keep safe.

2
Please follow these safety instructions 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 environmental pollution.
Note
Details identified by the word "Note" contain additional
information.
Target group
These instructions are exclusively intended for quali-
fied contractors.
■Work on the refrigerant circuit may only be carried
out by authorised refrigeration engineers.
■Work on electrical equipment may only be carried
out by a qualified electrician.
■The system must be commissioned by the system
installer or a qualified person 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 regulations
Safety instructions for working on the system
Working on the system
■Isolate the system from the power supply, 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 reconnection.
■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, fit-
tings or pipework.
!Please note
Electronic assemblies can be damaged by elec-
trostatic discharge.
Prior to commencing work, touch earthed
objects such as heating or water pipes to dis-
charge static loads.
Repair work
!Please note
Repairing components that fulfil a safety func-
tion 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 tes-
ted together with the system can compromise its
function. Installing non-authorised components
and making non-approved modifications or con-
versions can compromise safety and may inva-
lidate our warranty.
For replacements, use only original spare parts
supplied or approved by Viessmann.
Safety instructions
Safety instructions
5838144

3
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 electrocution.
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.)
5838144

4
1. Safety and liability Occupational safety ............................................................................... 6
■Electrical connections ......................................................................... 6
■Work on the heat pump ...................................................................... 7
■Work on the refrigerant circuit ............................................................. 7
■Work on the casing ............................................................................. 7
2. Information Disposal of packaging ............................................................................ 8
Symbols ................................................................................................. 8
Intended use .......................................................................................... 8
Product information ................................................................................ 9
■Vitocal 300-G Pro, type BW 302.D090 to BW 302.D230 .................... 9
■Heat pump application limits ............................................................... 9
3. Preparing for installation General information on electrical connection ......................................... 10
Transport and siting requirements ......................................................... 10
■Unloading and handling ...................................................................... 10
■Installation room requirements ........................................................... 12
■Minimum clearances ........................................................................... 12
■Anti-vibration base .............................................................................. 13
Requirements for on-site connections ................................................... 14
■Dimensions Vitocal 300-G Pro ............................................................ 14
Hydraulic connection requirements ....................................................... 16
■Primary circuit: Brine/water, 2-stage (type BW 302.D090,
BW 302.D110, BW 302.D140, BW 302.D180 and BW 302.D230) ..... 17
■Primary circuit: Brine/water, heat pump cascade (type BW 302.D090
to BW 302.D230) ................................................................................ 18
■Heat pump cascade: 2-stage (type BW 302.D090 to BW 302.D230) . 19
■DHW heating (type BW 302.D090 to BW 302.D230) ......................... 20
4. Installation sequence Siting the heat pump .............................................................................. 22
■Levelling the heat pump ..................................................................... 22
■Removing the transport brackets ........................................................ 23
■Fitting the back panel, side panels and kicking plates ........................ 24
Making the hydraulic connections .......................................................... 25
■Overview of hydraulic connections ..................................................... 25
■Connecting the Vitocal 300-G Pro ...................................................... 26
■Fitting the Victaulic couplings ............................................................. 28
■Connecting the primary circuit ............................................................ 29
■Connecting the secondary circuit ....................................................... 29
Electrical connections ............................................................................ 30
■Routing cables to the heat pump wiring chamber .............................. 30
■Overview of electrical connections ..................................................... 31
■Terminal strip for system components ................................................ 33
■Main PCB with expansion PCB .......................................................... 33
■Message and safety connections (safety chain) with distribution ter-
minal ................................................................................................... 39
■Controller and sensor PCB ................................................................. 42
■Electric booster heater (on-site) ......................................................... 44
Power supply ......................................................................................... 45
■Control circuit power supply (230 V~) and power circuit (400 V~) ..... 45
■Electrical connection requirements ..................................................... 46
■Power supply with power-OFF without on-site load disconnect
(delivered condition) ........................................................................... 46
Mains monitor ........................................................................................ 47
■Electronic soft starter, type SMC ........................................................ 47
Fitting the shaft and dial for the ON/OFF switch and installing the pro-
gramming unit ........................................................................................ 48
Closing the heat pump ........................................................................... 48
Index
Index
5838144

5
5. Commissioning, inspec-
tion, maintenance
Steps - commissioning, inspection and maintenance ............................ 50
6. Troubleshooting Diagnosis ............................................................................................... 63
■Increased noise emissions ................................................................. 63
7. Repairs Removing the front panel and top panel ................................................ 64
Overview of electrical components ........................................................ 64
Overview of internal components .......................................................... 64
Draining the heat pump on the primary/secondary side ........................ 65
Checking sensors .................................................................................. 65
■Temperature sensors, type NTC 10 kΩ .............................................. 65
■Temperature sensors, type Pt500A .................................................... 66
Checking MCBs/fuses ........................................................................... 66
8. Parts lists Ordering parts ........................................................................................ 67
Components, heat pump ....................................................................... 68
Components, heat pump, PCB .............................................................. 70
9. Commissioning/service
reports
Hydraulic parameter report .................................................................... 72
Control parameter report ....................................................................... 72
10. Specification Specification, Vitocal 300-G Pro ............................................................ 80
11. Appendix Heat pump commissioning request ....................................................... 84
12. Final decommissioning Dismantling / Disposal ........................................................................... 85
13. Certificates Declaration of conformity ....................................................................... 86
14. Keyword index ................................................................................................................ 87
Index
Index (cont.)
5838144

6
Responsibilities during the lifecycle phases
Lifecycle System
user
External
person-
nel
Manufac-
turer
Refriger-
ation en-
gineer
Logistics Electri-
cian/
heating
contrac-
tor
Service
engineer
Disposal
contrac-
tor
Manufacture X X
Delivery, mov-
ing, handling,
siting
X X X X X
Installation X X X
Commission-
ing
X X X X
Operation X X
Maintenance,
repair, shut-
down
X X X X X
Dismantling,
removal, col-
lection
X X X X X
Disposal X X X
Electrical connections
Danger
Electromagnetic radiation near the wiring cham-
ber of the heat pump control unit can interfere
with electrical devices such as heart pacemak-
ers and defibrillators.
■Wearers of heart pacemakers:
Avoid the immediate vicinity of the heat pump
control unit wiring chamber; consult a doctor
beforehand if necessary.
■Store and use defibrillators outside the area at
risk.
Danger
Incorrectly executed electrical installations can
result in injuries from electrical current and dam-
age to the appliance.
Connect the power supply and implement all
safety measures (e.g. RCD circuit) in accord-
ance with the following regulations:
■IEC 60364-4-41
■VDE regulations
■Technical connection requirements specified
by the local power supply utility
Danger
Contact with live components can lead to seri-
ous injury from electric current. Some compo-
nents on PCBs remain 'live' even after the
power supply has been switched off.
■Isolate the system from its power supply (e.g.
at a separate MCB/fuse or mains isolator),
check that there are no 'live' currents and
safeguard against reconnection.
Note
In addition to the control circuit there may be
several power circuits.
■Prior to removing the heat pump covers, wait
at least 4 min until the voltage has dropped
off.
■Never touch terminal areas of the heat pump
control unit or power connections (see
page 31).
Danger
The absence of component earthing can result
in serious injury from electrical current and in
component damage in the event of an electrical
fault.
■Always re-establish all earth connections of
the heat pump.
■The heat pump and pipework must be groun-
ded to the equipotential bonding of the build-
ing.
Safety and liability
Occupational safety
5838144
Information

7
Note
Observe all information in the "Safety instructions".
For further information regarding electrical connec-
tions, see from page 30.
Work on the heat pump
Note
Before commissioning and after repair or maintenance
work, check that the heat pump is in the intended con-
dition.
Danger
Falling of heavy or unwieldy heat pump compo-
nents can result in life threatening crushing or
breaks.
■Always use suitable ropes/slings and lifting
gear when installing/dismantling compressors,
heat exchangers or similar.
■Wear appropriate protective clothing (e.g.
safety boots) in compliance with applicable
regulations on accident prevention and in line
with trade association recommendations.
Work on the refrigerant circuit
Danger
Direct contact with refrigerant can be harmful to
skin.
■Only work on the refrigerant circuit whilst
wearing safety goggles and gloves.
Note
Work on the refrigerant circuit must only be
carried out by a qualified refrigeration engi-
neer.
■Wear suitable protective clothing.
Danger
Refrigerant circuits of heat pumps develop
extremely low (–25 °C) and very high (+130 °C)
temperatures. Work on heat pumps can result in
life threatening frostbite and burns.
■Switch off the heat pump at least 30 min
before working on it.
■Never touch the injection valve or compressor
with bare hands; wear safety gloves if contact
is necessary.
■Wear suitable protective clothing.
Danger
Refrigerant R410A is a non-poisonous gas that
displaces air. Unregulated escape of refrigerant
R410A in enclosed spaces can result in difficul-
ties in breathing and suffocation.
■Never breathe in refrigerant vapours.
■Ensure adequate ventilation in enclosed
spaces.
■Prevent open flames.
■Always observe regulations and guidelines on
handling this type of refrigerant.
Work on the casing
Danger
Breaking through the knockouts on the back
panel leaves behind sharp edges from the metal
retaining tabs that can lead to life threatening
injuries.
■Finish and seal the edges appropriately before
installation.
Note
Damage to the surfaces of the casing can lead to cor-
rosion.
Safety and liability
Occupational safety (cont.)
5838144
Information

8
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 Vitocal 300-G Pro heat pumps, type BW 302.D090
to 302.D230 can be used for the following purposes:
■Generation of cooling and/or heating
■Central heating and room cooling via a heating sys-
tem
■DHW heating
■Swimming pool 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.
Power supply: Up to 1000 A and 400 V
Information
Disposal of packaging
5838144
Information

9
For operation in industry, commerce, property develop-
ment with enclosed boiler room
Commercial or industrial usage for a purpose other
than central heating/cooling or DHW heating shall be
deemed inappropriate.
Incorrect use and/or operation of the appliance (e.g.
the appliance being opened by the system user) is pro-
hibited and will result in an exclusion of liability. Incor-
rect use also occurs if the components in the heating
system are modified from their intended function.
Note
The Vitocal 300-G Pro must be operated exclusively
by authorised and trained personnel.
Product information
Vitocal 300-G Pro, type BW 302.D090 to BW 302.D230
Characteristics
■Integral heat pump control unit Vitotronic 200,
type WO1C
■The refrigerant circuit has an electronic expansion
valve (EEV) with an independent control circuit
(refrigerant circuit controller).
■The heat pump control unit can regulate one cooling
circuit. The cooling circuit may be a heating circuit
prepared on site for cooling operation or a separate
cooling circuit.
■All sensors are fitted inside sensor wells.
■Electric booster heaters (on site) can be controlled
(e.g. instantaneous heating water heater, immersion
heater in heating water buffer cylinder).
An output increase in connection with additional
Vitocal 300-G Pro (cascade) is possible.
Heat pump application limits
System limit See P&I diagram, connection and wiring diagram
Service life
Heat pump 15 to 25 years
Wearing parts (filter dryer, refrigerant oil, com-
pressor)
Note
Refrigerant oil is available from your local re-
tailer.
4 to 5 years, subject to hours run and operating point
Information
Intended use (cont.)
5838144
Information

10
■Electrical connection of system components
(pumps, mixers, valves, message facilities, contac-
tors, function extensions, sensors etc.):
Connections are made inside the heat pump wiring
chamber. Observe information from page 31.
■Power supply:
The number of power cables from the meter box to
the heat pump wiring chamber depends on the sys-
tem version and tariffs used. Observe information
from page 45.
Transport and siting requirements
■The Vitocal 300-G Pro is delivered as a standard
unit. Side panels are packed separately for fitting on
site. See pages 22 to 24.
■The programming unit of the Vitotronic 200 is deliv-
ered loose inside the wiring chamber and must be fit-
ted and connected on site. See page 48.
■Accessories are delivered separately.
■The heat pump has been charged with oil and refrig-
erant at the factory.
Unloading and handling
Note
Before unloading, check the consignment for damage.
Note down any damage on the delivery note and notify
the haulage contractor.
■Lifting gear, such as slings and cross beams, must
be provided on site.
■The lifting capacity of each sling and that of the cross
beam must be at least equal to the shipping weight.
See "Specification".
■Only use suitable equipment for unloading the lorry;
see the following chapter.
!Please note
Incorrect unloading and transporting can result
in damage to the appliance.
■Never put weight on top of the appliance.
■Protect the paint:
Wrap the lifting gear (such as ropes, cross
beams) and place padding between the heat
pump and lifting gear.
■Observe correct weight distribution when lift-
ing. Due to the heat exchangers, the heat
pump's centre of gravity is at the back, by the
hydraulic connections.
■To protect heat pump pipework:
Avoid bumps and shocks.
■To protect the refrigerant circuit:
Avoid major slopes of the compressor.
Maximum heat pump tilting angle 30°.
Note
Viessmann (Switzerland) AG accepts no liability for
any damage resulting from incorrect handling.
Preparing for installation
General information on electrical connection
5838144
Installation

11
Handling by crane
Fig. 1
ALifting shackle attachment points
BBelt strap suitable for the weight (see page 12)
CEdge protection (e.g. 2 or 3 layers of corrugated
cardboard)
DCross beam to relieve the load on the frame
Note
Lifting with belt straps is only permitted without fitted
side, front or back panels.
Handling by forklift truck or pallet truck
Fig. 2
Information regarding transport with fork lift truck
■Select a fork length appropriate for the total heat
pump length; see "Specification" from page 80.
■The heat pump's centre of gravity is at the back,
close to the hydraulic connections.
■Observe required edge protection (e.g. 2 or 3 layers
of corrugated cardboard).
Note
Transport by fork lift truck is only permitted without fit-
ted side, front and back panels.
Preparing for installation
Transport and siting requirements (cont.)
5838144
Installation

12
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
3 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.
!Please note
Overloading the floor can result in damage to
the building structure.
Observe the permissible floor load. Take the
weight of the appliance into account.
Weight
Type Weight in kg
BW 302.D090 720
BW 302.D110 910
BW 302.D140 1180
BW 302.D180 1280
BW 302.D230 1425
■To prevent the transmission of structure-borne noise,
never site the appliance above ceilings with wooden
joists (e.g. in the attic).
■Level the appliance horizontally.
Where floors are uneven, distribute the load evenly
across the feet.
■Observe minimum room volume (to EN 378).
Observe additional country-specific regulations.
Minimum room volume, based on the available
air volume
Type Minimum room volume
in m3
BW 302.D090 24
BW 302.D110 30
BW 302.D140 39
BW 302.D180 51
BW 302.D230 97
Note
Refrigerant charge, see "Specification" or type plate.
■Observe the floor area and minimum clearances
(see following chapter).
Minimum clearances
Ensure adequate clearance around the system for
maintenance, repair and dismantling.
One heat pump
600 600
Fig. 3
Cascade with 2 heat pumps
600 600 600
Fig. 4
APower cable entry
BWith connection set and anti-vibration expansion
joints (accessories)
≥ 1000 mm
Preparing for installation
Transport and siting requirements (cont.)
5838144
Installation

13
CClearances for installation and maintenance:
≥ 500 mm
DClearance (according to DIN 18101):
≥ 944 mm
Note
The electronic injection valve and the compressor wir-
ing chamber are located on the right-hand side.
Anti-vibration base
The heat pump should be sited on a base prepared on
site for the purpose of noise attenuation and even
weight distribution.
Note
In the case of corner installation, enlarge the base by
the minimum clearances (see chapter "Minimum clear-
ances" on page 12).
150
Fig. 5
AConcrete B25, iron
BFloor construction, screed
CTop edge unfinished floor
DImpact sound insulation as per regulations
EPressure-tested sound insulation layer, approx.
10 to 20 mm
FHeat pump
Pressure points of the heat pump feet
Types BW 302.D090 and BW 302.D110
168
1400
1064
1000
50
709
50
145,5
Fig. 6
êPressure point, foot
EPressure-tested sound insulation layer, approx.
10 to 20 mm
FFront of the heat pump
Preparing for installation
Transport and siting requirements (cont.)
5838144
Installation

14
Type BW 302.D140, BW 302.D180 and BW 302.D230
2040
852 800
1000
50
709
50
194
145,5
Fig. 7
êPressure point, foot
EPressure-tested sound insulation layer, approx. 10
to 20 mm
FFront of the heat pump
Requirements for on-site connections
Dimensions Vitocal 300-G Pro
Dimensions, types BW 302.D090 and BW 302.D110
850
1380
1650
911
1139
609
639
1169
271 300340
Fig. 8
A Primary circuit flow (inlet):
Victaulic 3" (DN 80)
B Secondary circuit flow (outlet):
Victaulic 2½" (DN 65)
C Primary circuit return (outlet):
Victaulic 3" (DN 80)
D Secondary circuit return (inlet):
Victaulic 2½" (DN 65)
ELow voltage < 50 V
FPower supply 230 V/50 Hz
GPower supply 400 V/50 Hz
Preparing for installation
Transport and siting requirements (cont.)
5838144
Installation

15
Note
The width of the heat pump is given with and without
side panels. The dimensions without side panels are
the transport dimensions for handling.
Dimensions, types BW 302.D140 and BW 302.D180
850
1139
609
639
1169
271 300 340 1972
1650
911
Fig. 9
A Primary circuit flow (inlet):
Victaulic 3" (DN 80)
B Secondary circuit flow (outlet):
Victaulic 2½" (DN 65)
C Primary circuit return (outlet):
Victaulic 3" (DN 80)
D Secondary circuit return (inlet):
Victaulic 2½" (DN 65)
ELow voltage < 50 V
FPower supply 230 V/50 Hz
GPower supply 400 V/50 Hz
Note
The width of the heat pump is given with and without
side panels. The dimensions without side panels are
the transport dimensions for handling.
Preparing for installation
Requirements for on-site connections (cont.)
5838144
Installation

16
Dimensions, type BW 302.D230
850
1240
643
508
1105
368 367
176
1972
1650
911
Fig. 10
A Primary circuit flow (inlet):
Victaulic 3" (DN 80)
B Secondary circuit flow (outlet):
Victaulic 2½" (DN 65)
C Primary circuit return (outlet):
Victaulic 3" (DN 80)
D Secondary circuit return (inlet):
Victaulic 2½" (DN 65)
ELow voltage < 50 V
FPower supply 230 V/50 Hz
GPower supply 400 V/50 Hz
Note
The width of the heat pump is given with and without
side panels. The dimensions without side panels are
the transport dimensions for handling.
Hydraulic connection requirements
■Make on-site hydraulic connections stress-free.
■Make the hydraulic connections between several
heat pumps on site.
■All components required for the cooling circuit must
be provided on site. This must be achieved with an
appropriately sized plate heat exchanger.
Preparing for installation
Requirements for on-site connections (cont.)
5838144
Installation

17
Primary circuit: Brine/water, 2-stage (type BW 302.D090, BW 302.D110,
BW 302.D140, BW 302.D180 and BW 302.D230)
Hydraulic installation scheme
22
27
20
21
1
15
--2/211.1--
P1
25
--2/224.2--
P1
2
--KM BUS--
--230 V--
--F2--
--211.1-- --F3--
--224.2--
--LP1 X3.8;3.9--
--2/LP1 X3.8;3.9--
P
Fig. 11
Required equipment
Pos. Description
1Heat pump
2Heat pump control unit
qT Primary pump 1 (fail-safe)
wP Brine safety assembly
wQ Pressure switch, primary circuit
wW Brine manifold for geothermal probes/collectors
wT Optionally: 2nd primary pump (fail-safe) for stage 2
Note
■Contactor relay required.
■Size primary pump 1 qT for partial load.
wU Geothermal probes
Electrical installation scheme
For a summary of electrical connections, see from
page 31 and separate "Connection and wiring dia-
gram".
Preparing for installation
Hydraulic connection requirements (cont.)
5838144
Installation

18
Primary circuit: Brine/water, heat pump cascade (type BW 302.D090 to BW 302.D230)
Hydraulic installation scheme
22
27
20
21
9
P1
25
P1
P1
15
2
--KM BUS--
--230 V--
--F2--
--211.1-- --F3--
--2/211.1--
--2/211.1--
P1
1
2
--KM BUS--
--230 V--
--F2--
--211.1-- --F3--
--LP1 X3.8;3.9--
--LP1 X3.8;3.9--
--2/LP1 X3.8;3.9--
P
Fig. 12
Equipment required
Pos. Description
1Lead heat pump
2Heat pump control unit with LON communication module (accessories)
9Lag heat pump
qT Primary pump, lead heat pump (fail-safe)
Note
For 2-stage Vitocal 300-G Pro, a primary pump can be used for stages 1 and 2 respectively. Ob-
serve minimum flow rate.
wP Brine safety assembly
wQ Pressure switch, primary circuit
wW Brine manifold, geothermal probes/collectors
wT Primary pump, lag heat pump (fail-safe)
Note
For 2-stage Vitocal 300-G Pro, a primary pump can be used for stages 1 and 2 respectively.
wU Geothermal probes
Electrical installation scheme
For a summary of electrical connections, see from
page 31 and separate "Connection and wiring dia-
gram".
Preparing for installation
Hydraulic connection requirements (cont.)
5838144
Installation

19
Heat pump cascade: 2-stage (type BW 302.D090 to BW 302.D230)
A heat pump cascade consists of a lead heat pump
and lag heat pumps.
Each lag heat pump has a heat pump control unit.
Both the lead and lag heat pumps can have 2 stages.
The lead heat pump regulates the operation of the
heat pumps within the cascade.
■Up to 4 lag heat pumps possible when connected via
LON.
The following communication modules (accessories)
must be fitted in the heat pump control units:
–LON cascade communication module in the lead
heat pump
–LON communication module in lag heat pumps
Hydraulic installation scheme
IV III II I
Fig. 13
AInterface to heating water buffer cylinder
(return)
CInterface to the separate cooling circuit or heat-
ing/cooling circuit
HInterface to heating water buffer cylinder (flow)
PInterface to primary circuit (flow)
QInterface to primary circuit (return)
WInterface to the DHW cylinder
I Lead heat pump in the heat pump cascade
(1-stage or 2-stage)
II to IV Lag heat pump in the heat pump cascade
(1-stage or 2-stage respectively)
Equipment required
Pos. Description
Heat generator
1Heat pumps
2Heat pump control unit
3Outside temperature sensor
4LON communication module for cascade control of the lead heat pump I
LON communication module for lag heat pumps II to IV
5Secondary pump 1 (fail-safe)
6Circulation pump for cylinder heating (fail-safe)
Preparing for installation
Hydraulic connection requirements (cont.)
5838144
Installation

20
Pos. Description
7Only for type BW 302.D140, BW 302.D180 and BW 302.D230 (2-stage heat pumps):
Secondary pump 2 (fail-safe)
Note
■Contactor relay required
■Size secondary pump 1 5 for partial load.
qT Primary pump 1 (fail-safe)
wT Optionally: 2nd primary pump (fail-safe) for stage 2
Note
■Contactor relay required
■Size primary pumps qT and wT to at least 75 % each of the nominal flow rate.
Electrical installation scheme
For a summary of electrical connections, see from
page 31 and separate "Connection and wiring dia-
gram".
DHW heating (type BW 302.D090 to BW 302.D230)
Hydraulic installation scheme
W
30
36 35
33 34
WW
KW
32
X
37
Fig. 14
WHeat pump interface
XInterface to the solar thermal system or the exter-
nal heat generator
KW Cold water
WW DHW
Required equipment
Pos. Description
eP DHW cylinder
eW Cylinder temperature sensor
eE Cylinder loading pump (on the DHW side, fail-safe)
Preparing for installation
Hydraulic connection requirements (cont.)
5838144
Installation