Checking The Flue Gas Damper; Checking The Gas Type - Viessmann VITOCROSSAL CRU 800 kW Service Instructions Manual

Commissioning, inspection, maintenance
Commissioning the system
03. Check control cables:
■ Connection and kink-free routing
■ Application and seating of retaining clips
04. Check the gas supply pressure. See page 15.
05. Open the gas line shut-off valves.
06. Switch ON the mains isolator (outside the installa-
tion room).
07. Switch on the system ON/OFF switch at the user
interface of the control unit.
Vitotronic operating instructions
If "Burner fault" and
1. to acknowledge the fault message
2. to reset the burner.
Note
The boiler can enter a fault state during commis-
sioning if the gas line carries insufficient gas.
Purge the gas line again and reset the burner.

Checking the flue gas damper

Where present: Check the motorised flue gas damper
(flue gas cascade accessory).

Checking the gas type

1. Check with your gas supply utility regarding the
gas type and Wobbe index Ws (0 °C;
1013.25 mbar).
With the natural gas E setting, the boiler can be
■
operated in the Wobbe index range 12.0 to
3
16.1 kWh/m (43.2 to 58.0 MJ/m
■ With the LPG P setting, the boiler can be oper-
ated in the Wobbe index range 21.3 to
22.5 kWh/m 3 (76.9 to 81.2 MJ/m
Relative output losses of up to 10 % may occur,
■
depending on gas quality.
10
(cont.)
appear on the display:
3
).
3 ).
08. Check the function of the neutralising system.
Neutralising system operating instructions
09. Check all gaskets and plugs, and retighten if nec-
essary.
Note
Recommendation: Check all connections on the
heating water side for leaks after approx. 500
hours run. See page 21.
10. Check the burner door and flue gas cover a few
days after commissioning. In the case of leaks,
tighten the screws in the burner door with 40 Nm.
Tighten the screws of the flue gas collector with
30 Nm.
The flue gas damper must be closed in its zero volt
state (plug 53).
2. In the delivered condition, the burner is set up for
natural gas E. If required, convert the burner to a
different gas type during commissioning; when
doing so, observe the information provided by your
gas supply utility.
Operation with LPG
Operation with LPG requires the coding card for P
gas. This coding card must be ordered separately.
See chapter on "Conversion to LPG P" on
page 13.
3. Record the gas type in the report in the appendix
on page 62.