Setting The Maximum Heating Output - Viessmann Vitocrossal 100 Series Service Instructions For Contractors

Testing the static and supply pressure
Fig. 4 From 120 kW
1. Close the gas shut-off valve.
2. Release screw inside test connector "PE" on
A
the gas train, but do not remove it. Connect the
pressure gauge.
3. Open the gas shut-off valve.
4. Check the static pressure. Record the actual value
in the report on page 128.
Set value: Max. 30 mbar (3 kPa)
5. Start the boiler.
Note
During commissioning, the appliance can enter a
fault state because of airlocks in the gas line. After
approx. 5 s, press reset button R to reset the
burner.

Setting the maximum heating output

A limit can be set on the maximum heating output for
heating mode. The limit is set via the modulation
range. The upper limit of the max. adjustable heating
output is set by the coding card.
Commissioning, inspection, maintenance
(cont.)
6. Check the supply (flow) pressure.
Set value: 20/25 mbar (2/2.5 kPa)
Note
Use a suitable measuring device with a resolution
of at least 0.1 mbar (10 Pa) to check the supply
pressure.
7. Record the actual value in the report on page 128.
Implement measures as indicated in the table
below.
A
8. Shut down the boiler, close the gas shut-off valve,
remove the pressure gauge and close test connec-
tor A
9. Open the gas shut-off valve and start the appli-
ance.
Supply pres-
sure (flow pres-
sure)
Below 17 mbar
(1.7 kPa)
17 to 25 mbar
(1.7 to 2.5 kPa)
Above 25 mbar
(2.5 kPa)
with the screw.
Danger
Gas escaping from the test connector leads
to a risk of explosion.
Check gas tightness at test connector
Measures
Do not commission the boiler. Noti-
fy your gas supply utility or LPG
supplier.
Start the boiler.
Connect the separate gas pressure
governor upstream of the system
and set the pre-charge pressure to
20 mbar (2 kPa). Notify your gas
supply utility.
.
A
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