Viessmann Vitodens 222-F Operating instructions

Installation and service instructions
for contractors
VIESMANN
Vitodens 222-F
Type B2TA, 3.2 to 35 kW
Gas condensing storage combi boiler
Gas Council No.
41-819-15; 41-819-16; 41-819-17
Natural gas and LPG versions
For applicability, see the last page
VITODENS 222-F
5773 216 GB 10/2015 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 gas installations must only be carried out by
a registered gas fitter.
■Work on electrical equipment must 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
■All current safety regulations as defined by DIN, EN,
DVGW, TRGI, TRF, VDE and all locally applicable
standards
aÖNORM, EN, ÖVGW-TR Gas, ÖVGW-TRF and
ÖVE
cSEV, SUVA, SVGW, SVTI, SWKI, VKF and
EKAS guideline 1942: LPG, part 2
Safety instructions for working on the system
Working on the system
■Where gas is used as the fuel, close the main gas
shut-off valve and safeguard it against unintentional
reopening.
■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'.
■Safeguard the system against reconnection.
Danger
Hot surfaces can cause burns.
■Before maintenance and service work, switch
OFF the appliance and let it cool down.
■Never touch hot surfaces on the boiler, burner,
flue system 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 for operating the system
If you smell gas
Danger
Escaping gas can lead to explosions which may
result in serious injury.
■Do not smoke. Prevent naked flames and
sparks. Never switch lights or electrical appli-
ances on or off.
■Close the gas shut-off valve.
■Open windows and doors.
■Evacuate any people from the danger zone.
■Notify your gas or electricity supply utility from
outside the building.
■Have the power supply to the building shut off
from a safe place (outside the building).
If you smell flue gas
Danger
Flue gas can lead to life threatening poisoning.
■Shut down the heating system.
■Ventilate the installation site.
■Close doors to living spaces to prevent flue
gases from spreading.
Safety instructions
Safety instructions
5773 216 GB

3
What to do if water escapes from the appliance
Danger
When water escapes from the appliance there is
a risk of electrocution.
Switch off the heating system at the external iso-
lator (e.g. fuse box, domestic power distribu-
tion).
Flue systems and combustion air
Ensure that flue systems are clear and cannot be
sealed, for instance due to accumulation of conden-
sate or other causes. Ensure an adequate supply of
combustion air.
Instruct system users that subsequent modifications to
the building characteristics are not permissible (e.g.
cable/pipework routing, cladding or partitions).
Danger
Leaking or blocked flue systems, or an inade-
quate supply of combustion air can cause life
threatening poisoning from carbon monoxide in
the flue gas.
Ensure the flue system is in good working order.
Vents for supplying combustion air must be non-
closable.
Extractors
Operating appliances that extract air to the outside
(cooker hoods, extractors, air conditioning units, etc.)
can create negative pressure. If the boiler is operated
at the same time, this can lead to reverse flow of the
flue gas.
Danger
The simultaneous operation of the boiler and
appliances that extract air to the outside can
result in life threatening poisoning due to
reverse flow of the flue gas.
Fit an interlock circuit or take suitable steps to
ensure an adequate supply of combustion air.
Safety instructions
Safety instructions (cont.)
5773 216 GB

4
1. Information Disposal of packaging ............................................................................ 7
Symbols ................................................................................................. 7
Intended use .......................................................................................... 7
Product information ................................................................................ 8
■Vitodens 222-F, type B2TA ................................................................. 8
2. Preparing for installation Preparing for boiler installation .............................................................. 9
■Safety assembly to DIN 1988 and EN 806 on the cold water connec-
tion ...................................................................................................... 11
3. Installing the boiler Removing the front panels ..................................................................... 12
Siting and levelling the boiler ................................................................. 13
Connections on the heating water and DHW side ................................. 14
■Connection on the DHW side ............................................................. 14
Flue gas connection ............................................................................... 14
Gas connection ...................................................................................... 15
Opening the control unit enclosure ........................................................ 16
Electrical connections ............................................................................ 16
■Outside temperature sensor ! .......................................................... 18
■External demand via switching contact .............................................. 18
■External demand via 0 – 10 V input .................................................... 18
■External blocking via switching contact .............................................. 19
■Power supply for accessories at plug lH (230 V~) ............................. 20
■Power supply fÖ ................................................................................. 21
■Routing the connecting cables and leads ........................................... 21
Closing the control unit enclosure .......................................................... 22
Fitting the front panels ........................................................................... 23
4. Commissioning, inspec-
tion, maintenance
Steps - commissioning, inspection and maintenance ............................ 24
5. Codes Coding level 1 ........................................................................................ 55
■Calling up coding level 1 ..................................................................... 55
■"General"/Group 1 ............................................................................. 55
■"Boiler"/Group 2 ................................................................................ 57
■"DHW"/Group 3 .................................................................................. 57
■"Heating circuit ..."/Group 5 ............................................................. 58
Coding level 2 ........................................................................................ 62
■Calling up coding level 2 ..................................................................... 62
■"General"/Group 1 ............................................................................. 63
■"Boiler"/Group 2 ................................................................................ 67
■"DHW"/Group 3 .................................................................................. 68
■"Heating circuit ..."/Group 5 ............................................................. 69
6. Diagnosis and service
scans
Service menu ......................................................................................... 75
Diagnosis ............................................................................................... 75
■Operating data .................................................................................... 75
■Brief scan ............................................................................................ 76
Checking outputs (actuator test) ............................................................ 79
■Weather-compensated control unit ..................................................... 79
■Constant temperature control unit ...................................................... 79
7. Troubleshooting Fault display ........................................................................................... 81
■Weather-compensated control unit ..................................................... 81
■Constant temperature control unit ...................................................... 81
Fault codes ............................................................................................ 82
Index
Index
5773 216 GB

5
Maintenance .......................................................................................... 89
■Putting the control unit into the service position ................................. 90
■Drain boiler on the heating water side ................................................ 90
■Checking the outside temperature sensor .......................................... 91
■Checking the boiler temperature sensor, cylinder temperature sen-
sor or flow temperature sensor for low loss header ............................ 92
■Checking the outlet temperature sensor ............................................. 93
■Checking the plate heat exchanger .................................................... 94
■Checking the flue gas temperature sensor ......................................... 94
■Checking the temperature limiter ........................................................ 95
■Checking the fuse/MCB ...................................................................... 96
■Mixer extension kit .............................................................................. 97
■Checking the Vitotronic 200-H (accessories) ...................................... 98
8. Parts lists Overview of assemblies ......................................................................... 99
■Ordering parts ..................................................................................... 99
Casing ....................................................................................................102
Hydraulics .............................................................................................. 104
Hydraulic block ...................................................................................... 108
Loading cylinder .....................................................................................110
Heat cell ................................................................................................. 112
MatriX cylinder burner ............................................................................114
Control unit ............................................................................................ 116
Miscellaneous ........................................................................................ 118
................................................................................................................ 119
9. Function description Constant temperature control unit ......................................................... 120
■Heating mode ..................................................................................... 120
■DHW heating ...................................................................................... 120
Weather-compensated control unit ........................................................120
■Heating mode ..................................................................................... 121
■Heating the DHW loading cylinder from cold ......................................121
■Reheating when DHW is drawn off .....................................................121
■Boosting DHW heating ....................................................................... 121
Internal extensions .................................................................................122
■Internal extension H1 ..........................................................................122
■Internal extension H2 ..........................................................................123
External extensions (accessories) ......................................................... 124
■AM1 extension ....................................................................................124
■EA1 extension .................................................................................... 125
Control functions ....................................................................................127
■External operating program changeover ............................................ 127
■External blocking ................................................................................ 127
■External demand ................................................................................ 128
■Venting program ................................................................................. 128
■Fill program .........................................................................................128
■Screed drying ..................................................................................... 128
■Raising the reduced room temperature .............................................. 130
■Reducing the heat-up time ................................................................. 131
Allocating heating circuits to the remote control .................................... 132
Electronic combustion control unit ......................................................... 133
10. Connection and wiring dia-
gram
Internal connection diagram .................................................................. 134
External connection diagram ................................................................. 135
11. Commissioning/service
reports
................................................................................................................136
12. Specification ................................................................................................................137
13. Disposal Final decommissioning and disposal ..................................................... 138
Index
Index
5773 216 GB

6
14. Certificates Declaration of conformity ....................................................................... 139
Manufacturer's certificate according to the 1st BImSchV [Germany] .... 139
15. Keyword index ................................................................................................................140
Index
Index (cont.)
5773 216 GB

7
Please dispose of packaging waste in line with statu-
tory regulations.
DE: Use the disposal system organised by
Viessmann.
AT: Use the ARA statutory disposal system (Altstoff
Recycling Austria AG, licence number 5766).
CH: Packaging waste is disposed of by the HVAC
contractor.
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 intended solely for installation and
operation in sealed unvented heating systems that
comply with EN 12828, with due attention paid to the
associated installation, service and operating instruc-
tions. It is only designed for heating up heating water
that is of potable water quality.
Intended use presupposes that a fixed installation in
conjunction with permissible, system-specific compo-
nents has been carried out.
Information
Disposal of packaging
5773 216 GB
Information

8
Commercial or industrial usage for a purpose other
than heating the building or DHW shall be deemed
inappropriate.
Any usage beyond this must be approved by the man-
ufacturer in each individual case.
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 use (e.g. if the
flue gas and ventilation air paths are sealed).
Product information
Vitodens 222-F, type B2TA
Gas condensing storage combi boiler with Inox-Radial
heating surface and the following integrated compo-
nents:
■Modulating MatriX cylinder burner for natural gas
■Loading cylinder (100 or 130 l capacity)
■Hydraulics with 3-way diverter valve and variable
speed high efficiency circulation pump
■Vitotronic 100 for constant temperature mode or
Vitotronic 200 for weather-compensated mode
■Integral diaphragm expansion vessel (12 l capacity)
Preset for operation with natural gas E and
natural gas LL.
The Vitodens 222-F may only be delivered to countries
listed on the type plate. For deliveries to other coun-
tries, approved contractors must arrange individual
approval on their own initiative and in accordance with
the law of the country in question.
Information
Intended use (cont.)
5773 216 GB
Information

9
Use a connection set or connection kit, available as an
accessory, to make the connection on the gas and
water sides.
Fitting accessories
Fit all accessories that are installed at the back of the
boiler (e.g. connection sets).
Preparing the connections on site:
Connection set installation instructions
or
Assembly kit installation instructions.
Note
Fit safety equipment in accordance with the national
regulations.
!Please note
Avoid appliance damage.
Connect all pipework free of load and torque
stress.
The following diagram shows sample connection sets
for installation on finished walls, with connection to the
top or side.
100
569
46
40
50
c
d
e
f
g
h
k
l
m
n
p
a b
140
50
320
361
398
410
80
Fig. 1
q
50
595
50
600
55
220
330
G
C
A
B
F
D
E
Fig. 2
AHeating flow R ¾
BDHW R ½
CGas connection R ¾
DCold water R ½
EHeating return R ¾
FDHW circulation R ½ (separate accessory)
GCondensate drain facing backwards into the wall
HCondensate drain to the side
KWiring area
Rated heating output
range
3.2 - 26 kW 5.2 - 35 kW
a (mm) 745 945
b (mm) 750 950
c (mm) 972 1172
d (mm) 1027 1227
e (mm) 1082 1302
f (mm) 1137 1337
g (mm) 1191 1391
h (mm) 1247 1447
k (mm) 1302 1562
l (mm) 1437 1637
m (mm) 1466 1666
Preparing for installation
Preparing for boiler installation
5773 216 GB
Installation

10
Rated heating output
range
3.2 - 26 kW 5.2 - 35 kW
n (mm) 1465 1665
p (mm) 1526 1726
q (mm) 201 224
Note
All height dimensions have a tolerance of +15 mm due
to the adjustable feet.
1. Prepare the heating water connections.
Thoroughly flush the heating system.
Note
Should an additional expansion vessel be required
on site, connect this vessel in the heating return.
M
L
>200
Fig. 3
2. Prepare the connections on the DHW side. Install
the safety assembly (accessory or on-site provi-
sion) in the cold water line to DIN 1988 and EN 806
(see page 11).
Recommendation:
Install the safety valve above the DHW cylinder to
protect it against contamination, scaling and high
temperatures.
c: According to W3 "Principles for creating pota-
ble water installations", safety valves must be
drained directly via a visible unrestricted drain or via
a short outlet line to the drain network.
Note
Do not connect the DHW cylinder safety valve to
hose L. Never change the position of hose L
(used for ventilation).
3. Route condensate hose M to the back (drain in
wall G) or to side aperture H (see page 9).
Route the condensate hose with a U-bend. Connect
it with a fall to the on-site drain line or a trap.
4. Prepare the gas connection according to TRGI or
TRF [or local regulations].
5. Prepare the electrical connections.
■Power cable: NYM-J 3 x 1.5 mm2, max. fuse rat-
ing 16 A, 230 V/50 Hz.
■Accessory cables: NYM with the required number
of cores for external connections.
■Allow all cables in area K (see page 9) to pro-
trude approx. 2000 mm from the wall.
Preparing for installation
Preparing for boiler installation (cont.)
5773 216 GB
Installation

11
Safety assembly to DIN 1988 and EN 806 on the cold water connection
C
F
B
D E GH D
K
D H L M D N K
A
O
Fig. 4
ASafety assembly (accessory for connection sets for
unfinished walls)
BSafety valve
CVisible discharge pipe outlet point
DShut-off valve
EFlow regulating valve (installation recommended)
FPressure gauge connection
GNon-return valve
HDrain
KCold water
LDrinking water filter
MPressure reducer to DIN 1988-2, Dec. 1988 issue
NNon-return valve/pipe separator
OCold water connection at connection set (accesso-
ries)
Preparing for installation
Preparing for boiler installation (cont.)
5773 216 GB
Installation

12
2.
5.
1.
4.
2x
3.
Fig. 5
Installing the boiler
Removing the front panels
5773 216 GB
Installation

13
1.
2.
SW17
Fig. 6
Installing the boiler
Siting and levelling the boiler
5773 216 GB
Installation

14
Fig. 7 Shown with connection sets for finished walls
(accessories)
AHeating flow R¾
BDHW R½
CDHW circulation R½ (separate accessory)
DCold water R½
EHeating return R¾
Connection on the DHW side
The DHW expansion vessel, available as an acces-
sory, is installed in the cold water supply inside the
boiler.
Separate installation instructions
Flue gas connection
Note
■The "System certificate" and "Skoberne GmbH flue
system" labels enclosed with the technical documen-
tation may only be used in conjunction with the
Viessmann flue system made by Skoberne.
■During installation and positioning of the flue system,
observe Part L and BS 5440 building regulations [GB
only].
Connecting the balanced flue pipe
Flue system installation instructions
Do not carry out commissioning until the following
conditions are met:
■Free passage through the flue gas pipes.
■Flue system with positive pressure is gas-tight.
■Apertures for ensuring sufficient combustion air sup-
ply are open and cannot be closed off.
■Applicable regulations on installing and commission-
ing flue systems have been followed.
Danger
Leaking or blocked flue systems or an insuffi-
cient supply of combustion air cause life threat-
ening poisoning due to carbon monoxide in the
flue gas.
Ensure the flue system functions correctly. Aper-
tures for combustion air supply must not be able
to be closed off.
Installing the boiler
Connections on the heating water and DHW side
5773 216 GB
Installation

15
Fig. 8
Information on operation with LPG
When installing the boiler in rooms below ground level
we recommend fitting an external safety solenoid
valve.
1. Seal gas shut-off valve A to the gas connection.
2. Carry out a tightness test.
Note
Only use suitable and approved leak detection
agents (EN 14291) and devices for the tightness
test. Leak detection agents with unsuitable constitu-
ents (e.g. nitrides, sulphides) can cause material
damage.
Remove leak detection agent residues after testing.
!Please note
Excessive test pressure will damage the
boiler and the gas train.
Max. test pressure 150 mbar (15 kPa). If a
higher pressure is required for tightness
tests, disconnect the boiler and the gas train
from the main supply pipe (undo the fitting).
3. Purge the gas line.
Conversion to alternative gas types:
See page 31.
Installing the boiler
Gas connection
5773 216 GB
Installation

16
2x
4x
4.
3.
5.
2.
1.
Fig. 9
Electrical connections
!Please note
Electronic assemblies can be damaged by elec-
trostatic discharge.
Prior to commencing any work, touch earthed
objects such as heating or water pipes to dis-
charge static loads.
Installing the boiler
Opening the control unit enclosure
5773 216 GB
Installation

17
L N
230V~ 230V~
96 40
1LN
2 1
145
2
1
32 15 4
145
40962035100 21
A
B
Fig. 10
ARadio clock receiver
BJumper
Connections to 230 V~ plugs
fÖ Power supply
lH ■Power supply for accessories
■External demand/blocking
■Room temperature controller (remove jumper B
when making this connection):
–Vitotrol 100, type UTA
–Vitotrol 100, type UTDB
–Vitotrol 100, type UTDB-RF
Connections to LV plugs
X3 Plug X3 can be pulled out to make assembly eas-
ier.
!Outside temperature sensor
?Flow temperature sensor for low loss header
(accessories)
ARadio clock receiver
X4 KM BUS connection, variable speed heating cir-
cuit pump (if installed)
aVG KM BUS subscriber (accessories)
To connect several accessories, see page 20.
■Vitotrol 200A or 300A remote control
■Vitocom 100, type GSM
■Mixer extension kit
■AM1 extension
■EA1 extension
■Wireless base station
■KM BUS distributor
Information on connecting accessories
When connecting accessories observe the sep-
arate installation instructions provided with
them.
Installing the boiler
Electrical connections (cont.)
5773 216 GB
Installation

18
Outside temperature sensor !
For fitting the wireless outside temperature sensor
(wireless accessory):
Wireless base station installation and service
instructions
Fitting location for outside temperature sensor
■North or north-western wall, 2 to 2.5 m above ground
level; in multi storey buildings, in the upper half of the
second floor
■Not above windows, doors or vents
■Not immediately below balconies or gutters
■Never render over
Outside temperature sensor connection
2-core lead, length max. 35 m with a cross-section of
1.5 mm2
External demand via switching contact
Connection options:
■EA1 extension (accessory, see separate installation
instructions)
■Plug lH
When the contact is closed, burner operation is load-
dependent. The boiler water is heated to the set value
selected in coding address "9b" in group "General"/1.
The boiler water temperature is limited by this set
value and by the electronic maximum limit (coding
address "06" in group "Boiler"/2).
!Please note
Live contacts lead to short circuits or phase fail-
ure.
The external connection must be floating and
meet the requirements of protection class II.
Plug lH EA1 extension
A
lH
N
?
1L
AFloating contact (when connected, remove jumper
between L and 1)
B
[{S
DE [{D DE
[{A
DE
A
AFloating contact
BEA1 extension
Codes
■"4b:1" in group "General"/1
■Effect of the function on the relevant heating circuit
pump:
Coding address "d7" in group "Heating circuit" (only
for weather-compensated control units)
■Effect of the function on the circulation pump for cylin-
der heating:
Coding address "5F" in group "DHW"/3
Codes
■Set "3A" (DE1), "3b" (DE2) or "3C" (DE3) to 2 in
group "General"/1
■Effect of the function on the relevant heating circuit
pump:
Coding address "d7" in group "Heating circuit" (only
for weather-compensated control units)
■Effect of the function on the circulation pump for cylin-
der heating:
Coding address "5F" in group "DHW"/3
External demand via 0 – 10 V input
Connection at 0 – 10 V input to EA1 extension.
Installing the boiler
Electrical connections (cont.)
5773 216 GB
Installation

19
!Please note
Ensure DC separation between the earth con-
ductor and the negative pole of the on-site volt-
age source.
U
+
LNL
N
fÖ
SP
aBJ
Ö
[{{]
0-10V f-]
A
+ -
Fig. 11
0 – 1 V ≙ No default set boiler water temperature
1 V ≙ Set value 10 °C
10 V ≙ Set value 100 °C
External blocking via switching contact
Connection options:
■Plug lH
■EA1 extension (accessory, see separate installation
instructions)
When the contact is closed, the burner is switched off.
The heating circuit pump and (if installed) the circula-
tion pump for cylinder heating are switched according
to the set code (see the following table "Codes").
!Please note
Live contacts lead to short circuits or phase fail-
ure.
The external connection must be floating and
meet the requirements of protection class II.
Plug lH EA1 extension
A
lH
N
?
1L
AFloating contact (when connected, remove jumper
between L and 1)
B
[{S
DE [{D DE
[{A
DE
A
AFloating contact
BEA1 extension
Codes
■"4b:2" in group "General"/1
■Effect of the function on the heating circuit pump:
Coding address "d6" in group "Heating circuit" (only
for weather-compensated control units)
■Effect of the function on the circulation pump for cylin-
der heating:
Coding address "5E" in group "DHW"/3
Codes
■Set "3A" (DE1), "3b" (DE2) or "3C" (DE3) to 3 or 4 in
group "General"/1.
■Effect of the function on the heating circuit pump:
Coding address "d6" in group "Heating circuit" (only
for weather-compensated control units)
■Effect of the function on the circulation pump for cylin-
der heating:
Coding address "5E" in group "DHW"/3
Installing the boiler
Electrical connections (cont.)
5773 216 GB
Installation

20
Power supply for accessories at plug lH (230 V~)
Where the boiler is sited in a wet area, accessories
outside the wet area must not be connected to the
mains at the control unit. If the boiler is sited outside
wet rooms, the power supply for accessories can be
connected at the control unit. This connection is
switched directly with the ON/OFF switch of the control
unit.
If the total system current exceeds 6 A, connect one or
more extensions via an ON/OFF switch directly to the
mains supply (see next chapter).
Power supply to all accessories via heat source control unit
fÖ fÖ
B C
aVG fÖ lH
A D
E
aVG aVG f-]
A
aVG aVG f-]
A
fÖ aVG aVG f-]
A
Fig. 12
Some accessories with direct power supply
B CA D
E
fÖ fÖ aVG fÖ lH aVG aVG f-]
A
aVG aVG f-]
A
fÖ aVG aVG f-]
A
Fig. 13
AHeat source control unit
BExtension kit for heating circuit with mixer M2
CExtension kit for heating circuit with mixer M3
DAM1 extension or EA1 extension
EON/OFF switch
fÖ Mains input
fÖAPower outlet
lH Power outlet at the control unit
aVG KM BUS connection
If the current flowing to the connected working parts
(e.g. circulation pumps) is higher than the fuse rating
of the relevant accessory, only use the output con-
cerned to control an on-site relay.
Accessories Internal fuse protec-
tion
Extension kit for heating circuit
with mixer
2 A
AM1 extension 4 A
EA1 extension 2 A
Installing the boiler
Electrical connections (cont.)
5773 216 GB
Installation