Further Details Regarding The Individual Steps; Checking The High Limit Safety Cut-Out Setting; Filling The Heating System With Water And Venting The System; Filling The Siphon With Water - Viessmann VITOCROSSAL 300 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 the system

Enter the amount of fill water, water
hardness and pH value into the table on
page 15.
Permissible boiler operating pressure: 4
bar (0.4 MPa)
Minimum operating pressure: 0.5 bar
(50 kPa)
Note
The minimum operating pressure is
essential for safe operation and can be
ensured with a minimum pressure switch
(one per system for multi boiler sys-
tems).

Filling the siphon with water

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 23.
1. Undo the siphon and fill it with
water.
!
Please note
Risk of escaping flue gas.
Fill the siphon with water.
2. Check that the condensate can drain
freely.
3. Remount the siphon.
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