Reducing The Maximum Heating Output (If Required); Checking The Static Pressure And Supply Pressure - Viessmann Vitocrossal CRU 800 Service Instructions For Contractors

Commissioning, inspection, maintenance

Reducing the maximum heating output (if required)

The maximum heating output of the burner can be
reduced if required.
Programming unit on the burner control unit
Status Service
R
S
Fig. 5
Press the following buttons:
1. Press and hold S for longer than 2 s,
2. repeatedly, until "6" is shown under "Service".

Checking the static pressure and supply pressure

A
Fig. 6
Test connector
A
14
3. S to confirm, "6" is shown under "Status" and "1" is
shown under "Service".
4. S to confirm, "1" is shown under "Status". The cur-
rent value for the maximum heating output in % is
shown under "Service".
5. Use or
output.
6. S to confirm. If adopted successfully, "1" is shown
under "Service"; if it failed, "0" will appear.
7. S to change to the operating display.
8. R, the system will be restarted.
flashes.
to select the required maximum heating