Viessmann VITODENS 050-W User manual

5513827 GB 8/2014 Dispose after installation.
Installation instructions
for contractors
VIESMANN
Replacing the gas train
for Vitodens 050-W
Safety instructions
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 envi-
ronmental pollution.
Note
Details identified by the word "Note"
contain additional information.
Installation, initial start-up, inspection,
maintenance and repairs must only be
carried out by a competent person
(heating engineer/installation contrac-
tor).
Before working on the equipment/heat-
ing system, isolate the power supply
(e.g. by removing a separate mains
fuse or by means of a mains isolator)
and safeguard against unauthorised
reconnection.
When using gas as fuel, also close the
main gas shut-off valve and safeguard
against unauthorised reopening.
Repairing components which fulfil a
safety function can compromise the
safe operation of your heating system.
For replacements, use only original
spare parts supplied or approved by
Viessmann.
Opening the Vitodens
Installation and service instruc-
tions

2
C
B
D
AE
1. Pull cable from gas train A.
2. Undo union nut B and remove old
gas gasket.
3. Undo 2 screws C and remove gas
train A.
4. Insert new gasket D at new gas
train A.
■ Operation with natural gas:
Insert gasket D without the gas
restrictor.
■ Operation with LPG:
Insert gasket D with the gas
restrictor.
5. Mount gas train A with new gas
gasket E.
Torque for fixing screws C: 6 Nm
Torque for union nut B: 30 Nm
6. Start the boiler and check for tight-
ness.
Danger
Escaping gas leads to a risk
of explosion.
Check all gas equipment for
tightness.
!Please note
The use of leak detection
spray can result in faulty
operation.
Leak detection spray must
not come into contact with
electrical contacts or seal
the diaphragm opening on
the gas valve.
Replacing the gas train
5513827

3
A
1. Connect a flue gas analyser at flue
gas port A on the boiler flue con-
nection.
2. Start the boiler.
3. To check the CO2 content the
burner output can be set manually.
1. Press MODE.
2. Press / until "SERV" is dis-
played.
3. OK to confirm.
"OFF" appears on the display.
4. Select the burner output with / :
Display
Burner out-
put
_ 20 20 %
_ _ 40 40 %
_ _ _ 60 60 %
_ _ _ _ 80 80 %
_ _ _ _ _ 100 100 %
5. Confirm your settings with OK.
4. Set the higher heating output
(100 %) and check the CO2 con-
tent.
The CO2 content must be within the
following range for the respective
gas type:
Gas type CO2 content
in %
G20 7.5 – 10.5
G25 7.5 – 10.5
G31 10.0 – 12.0
5. Set the lower heating output (20 %)
and check the CO2 content.
The CO2 content must be at least
0.4 % below the value for the upper
heating output.
6. ■ If the CO2 content is within the
given range, continue with step 8.
■ If the CO2 content is outside the
given range, check the balanced
flue system for tightness; remedy
any leaks.
7. Re-check the CO2 content for the
upper and lower heating output.
8. Use / to set the burner output to
"OFF".
9. Press MODE, "SERV" is no longer
shown.
Note
The function also terminates auto-
matically after 30 min.
Checking the CO2 content
5513827

4
1. Shut down the boiler, remove the
flue gas analyser and close flue
gas test port A.
2. Mount front panel and start the
boiler.
Viessmann Limited
Hortonwood 30, Telford
Shropshire, TF1 7YP, GB
Telephone: [phone]
Fax: [phone]
E-mail: [email protected]
Viessmann Werke GmbH & Co. KG
D-35107 Allendorf
Telephone: [phone]
Fax: [phone]
www.viessmann.com
5513827 Subject to technical modifications.
Starting the boiler