Checking The Gas Type; Converting To Natural Gas Ll - Viessmann Vitocrossal 200 Service Instructions For Contractors

Checking the gas type

1. Check with your gas supply utility regarding the
gas type and Wobbe index (Wo).
■ With the natural gas E setting, the boiler can be
operated in the Wobbe index range 12.0 to
16.1 kWh/m 3 (43.2 to 58.0 MJ/m
With the natural gas LL setting, the boiler can be
■
operated in the Wobbe index range 10.0 to
3
13.1 kWh/m (36.0 to 47.2 MJ/m
CH).

Converting to natural gas LL

(not in AT and CH)
Conversion for 87 kW
01. Close the gas shut-off valve.
02. Switch OFF the system ON/OFF switch on the
control unit.
03. Switch OFF the mains isolator (outside the instal-
lation room) or isolate the mains power and
secure against unintentional reconnection.
04. Undo fitting .
A
F
G
H
E
D
C
B
A
Fig. 3
Conversion for 115 to 311 kW
01. Close the gas shut-off valve.
02. Switch OFF the system ON/OFF switch on the
control unit.
2. In the delivered condition, the burner is set up for
natural gas E. If required, convert the burner to a
different gas type in accordance with details provi-
ded by your gas supply utility.
3 ).
3. Record the gas type in the report in the appendix
on page 57.
3
) (not in AT and
05. Undo Venturi mixing pipe
Pull off compensation line
room sealed operation.
06. Undo the gas train from flange
07. Remove restrictor
mixing pipe
08. Secure the gas train at flange
tor
B
09. Secure Venturi mixing pipe
Connect compensation line
in room sealed operation.
10. Secure fitting
11. Affix supplied label "Set to ..."
label.
12. Start the burner.
!
03. Switch OFF the mains isolator (outside the instal-
lation room) or isolate the mains power and
secure against unintentional reconnection.
Commissioning, inspection, maintenance
H
E
with gasket
C
.
H
and without gasket
C D
.
.
A
Danger
Escaping gas leads to a risk of explosion.
Check the fitting for gas 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.
from the gas fan.
when the boiler is in
.
G
from Venturi
D
: without restric-
G
, but including O-ring
at the gas fan.
H
when the boiler is
E
over the existing
F
11