Minimising Pulsation Noise; Shutting Down The System; Opening The Boiler Door - Viessmann Vitocrossal 300 Service Instructions Manual

Commissioning the system
Danger
For safe operation, a minimum operating pres-
sure of 0.5 bar (50 kPa) is essential.
A minimum pressure switch can be used for this
purpose. See EN 12828.

Minimising pulsation noise

Pressure-tight flue systems can generate pulsation
noise regardless of the make of boiler, burner or flue
system. This also applies to negative pressure opera-
tion. Acoustic resonance may occur if the optional but-
terfly valve in the flue outlet is twisted.
Note
Observe the burner manufacturer's instructions.
1. Undo M 5 screw on lever
A
lock. See Fig. 3

Shutting down the system

1. 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
An electric shock can be life threatening.
Before opening the boiler, disconnect it from
the mains voltage, e.g. at the fuse or mains
isolator.

Opening the boiler door

Danger
When working with high temperature insulating
materials that contain zirconium or aluminium
silicate ceramic fibres, fibre dust may develop.
This fibre dust can be harmful to health.
Only trained personnel may adjust or replace
the insulation. Wear suitable protective clothing,
especially breathing equipment and safety gog-
gles.
1. Remove the gas supply pipe.
(cont.)
of the damper
B
Commissioning, inspection, maintenance
2. Adjust the lever until no further pulsation noise
occurs. The lever indicates the position of butterfly
valve . Check the emissions values if necessary.
C
3. Tighten M 5 screw
A
lock.
4. Adjust the burner.
2. Close the gas shut-off valve.
2. Undo 4 screws on the boiler door. Open the boiler
door.
!
Please note
Scratches inside the combustion chamber can
lead to corrosion.
Never place tools or other objects inside the
combustion chamber.
on lever of the damper
B
13