Further Details Regarding The Individual Steps; Checking The High Limit Safety Cut-Out Setting; Filling The Heating System With Water And Venting; Fully Opening The Rotary Damper In The Flue Outlet And Locking It Again - Viessmann VITOCROSSAL 300 Type CT3 Service Instructions Manual

Further details regarding the individual steps

Checking the high limit safety cut-out setting

The high limit safety cut-out must not be
set higher than 110 °C; if required, set it
to a maximum of 110 °C.

Filling the heating system with water and venting

Record the fill volume, water hardness
and pH value on page 15 .
Fully opening the rotary damper in the flue outlet and locking it
again
The rotary damper must be in the hori-
zontal position.

Commissioning the system

Operating instructions for control
unit, burner and neutralising sys-
tem, service instructions for con-
trol unit, and burner manufactur-
er's documentation
1. Check the heating system pressure.
Permissible boiler operating pres-
sure: 4 bar
2. Check that the installation room vent
is open.
3. Check the gas supply pressure.
4. Check that the cleaning aperture on
the flue outlet is closed.
Commissioning, inspection, maintenance
Control unit installation and serv-
ice instructions
!
Please note
Unsuitable water quality can
result in damage to the boiler
body and the heating system.
Observe the "Water quality
requirements" on page 27 .
Note
For handling the rotary damper, see
"Minimising pulsation noise" on
page 8.
5. Open the gas line shut-off valves.
6. Switch ON the mains isolator, the
switch for the heating circuit pump
and the burner ON/OFF switch, in
that order.
Burner manufacturer's oper-
ating instructions
7. Check the function of the neutralising
system.
Neutralising system operating
instructions
7