Checking The Flue Gas Damper - Viessmann Vitocrossal CRU 800 Service Instructions For Contractors

Commissioning the system
A A
Fig. 4

Checking the flue gas damper

Where present: Check the motorised flue gas damper
(flue gas cascade accessory).
Commissioning, inspection, maintenance
(cont.)
1. Check the heating system pressure.
Permiss. operating pres-
sure
Minimum operating
pressure
Danger
If the operating pressure is too low, excess
temperatures in the flue system can cause
leaks. Escaping flue gas can cause life
threatening carbon monoxide poisoning.
Ensure the minimum operating pressure with
a minimum pressure switch.
2. For open flue operation: Check that the ventilation
facility in the installation room is open.
3. Open the gas line shut-off valves.
4. Check the static pressure. See page 15.
5. Check the setting at air pressure switch 1
■ Rated heating output 800 kW: 2 mbar (0.2 kPa)
■ Rated heating output 1000 kW: 4 mbar (0.4 kPa)
6. Switch ON the mains isolator (outside the installa-
tion room).
7. Switch on the ON/OFF switch at the programming
unit of the control unit.
Vitotronic operating instructions
Note
During commissioning, the appliance may enter a
fault state due to remaining airlocks in the gas line:
"Burner fault" and
Purge the gas line again.
■
Reset burner:
■
to acknowledge the fault message
to reset the burner.
8. 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 10.
The flue gas damper must be closed in its zero volt
state (plug ).
gD
6 bar (0.6 MPa)
0.5 bar (50 kPa)
:
A
are shown on the display
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