Checking The Co Content; Checking The Flue Gas Temperature; Displaying The Ionisation Current; Shutting Down The System - Viessmann VITOCROSSAL CRU 800 kW Service Instructions Manual

Checking the CO
5. Check the CO content at the upper and lower
2
heating output again.
If the CO content is not within the specified range:
2
Repeat steps for upper and lower heating output.

Checking the CO content

Enter actual value into the report in the appendix.

Checking the flue gas temperature

Enter actual value into the report in the appendix.

Displaying the ionisation current

Note
The ionisation current must be called up via the burner
control unit. It is not possible to check the ionisation
current with a Testomatik-Gas or a multimeter.
01. Hold down S for approx. 2 s ; " " flashes.
02. Press until "5" appears under Service.
03. Press S. "5" appears under Status.
04. Press until "3" appears under Service.
05. Press S. "3" appears under Status. During opera-
tion, the ionisation current is shown under Service
(e.g. 30 = 3.0 A).
µ

Shutting down the system

1. Switch off the mains isolator or the power supply.
Safeguard against unauthorised reconnection.
Danger
Mains voltage can be life threatening.
Ensure that the system is not 'live' during
maintenance work.

Opening the combustion chamber

1. Undo the gas supply pipe at the fitting.
content
(cont.)
2
6. Hold down S and
2 s. Burner switches to operating mode.
06. Start the burner with emissions test mode enabled
07. Read the ionisation current.
08. Record the actual value in the report.
09. Hold down S for approx. 2 s ; " " flashes.
10. Press
11. Press S. "5" appears under Status.
12. Press
13. Press S. The operating display appears again.
2. Close the gas shut-off valve.
Commissioning, inspection, maintenance
simultaneously for longer than
(in control unit menu).
until "5" appears under Service.
until "0" appears under Service.
19