Reducing Operational Input (If Required); Checking The Static And The Supply Pressure - Viessmann Vitocrossal 200 CM2 400 Service Instructions Manual

Commissioning, Inspection, Maintenance
Steps – Commissioning, Inspection and Maintenance

Reducing operational input (if required)

To implement the changes the burner has to be in
stand-by, Status "0", Service "C".
The maximum operational input of the burner can be set
to between 70 and 100% if necessary:
"100" = 100% = upper heating input,
"0" = 0% = lower heating input
1. Press button S F and hold for longer than 2 seconds
and " " in the display area D will flash.
2. Press button E until "6" appears in the service
Y
display B.
3. Press button S F, until "6" appears in the status
display A.
4. Press button S F and "1" will appear in the status
display A and the current value for the maximum
operational input is shown in % in the service
display B.
5. Press button E or
Y
operational input.
6. Press button S F to confirm. If applied successfully,
"1" will be shown in the service display B.
If the adjustment failed, service display B will show "0".
7. Press button S F to switch to the operating display.
8. Press button R C for more than 2 seconds and the
system restarts and the settings will be applied.
Note: Each time the burner restarts, the setup parameters,
max. output, gas type and altitude will show up on
the display as in the table below.
16
G for the required maximum
B
Vitocrossal 200, CM2 400, 500, 620 and 620 TX Service
(continued)

Checking the static and the supply pressure

1. Close the gas shut-off valve.
2. Undo the screw inside test nipple A. Do Not Remove.
3. Connect the pressure tester at test nipple A.
4. Open the gas shut-off valve.
5. Check the static pressure (max. 14"w.c.).
6. Record the actual value in the report (on page 67).
IMPORTANT
A CO measurement (see page 18) must be taken before
and after working on gas appliances to eliminate risks to
health and to guarantee the satisfactory condition of the
system.
IMPORTANT
The burner is automatically ignited and starts operation
after a safety time has elapsed.
During initial start-up, the unit may indicate a fault because
of air in the gas supply pipe (especially for liquid propane gas).
After approximately 5 seconds, press the reset button R C
to reset the burner. The ignition procedure is repeated.
This boiler employs a direct spark ignition system.
WARNING
Never purge a gas line into a combustion chamber. Never
use matches, candles, flame, or other sources of ignition
for purpose of checking leakage. Use a soap-and-water
solution to check for leakage. Failure to follow this warning
could result in fire, explosion, personal injury, or death.
WARNING
Ensure that there is no open flame in the room.