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5790 733 - 07
Vitocrossal 300 CA3 Series 2.5 to 6.0 Installation/Service
Checking Static and Connection Pressure
Service
Static Pressure
1. Close gas shut-off valve.
2. Loosen screw in the measuring connector
A
do not
remove.
3. Connect pressure measuring device at measuring
connector
A
.
4. Open gas shut-off valve.
5. Measure static pressure max. 14 “w.c.
6. Record measurement reading in record (on page 222).
WARNING
Ensure that there is no open flame in the room.
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.
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.
After approximately 5 seconds, press the reset button R
to reset the burner. The ignition procedure is repeated.
This boiler employs a direct spark ignition system.
A CO
2
measurement (see page 93) 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
Supply pressure for NG/LPG
1.
Start the burner
Note:
For commissioning, see page 93. Switch the burner
to maximum heating output. For this, activate the
emissions test switch at the boiler control unit.
2. Measure the supply pressure (running pressure).
Use suitable measuring instruments calibrated with
a minimum resolution of 0.04 “w.c. Value must be as
per the chart below:
Note:
The supply pressure should be between 4 “w.c.
and 14 ”w.c. for NG and 10” w.c. to 14” w.c.
for LPG. The gas pressure switch for the inlet
pressure test/check is factory set to 4 ”w.c.
Never alter this setting.
3. Record the actual value in the record (on page 222).
4. Close the gas shut-off valve.
5. Remove the pressure tester and close test nipple
A
.
Supply pressure with:
Corrective action
Natural gas
Liquid propane gas
under 4”w.c.
under 10”w.c.
Do not attempt adjustment. Call local gas utility
4 to 14“w.c.
10 to 14”w.c.
Start up boiler.
over 14”w.c
over 14”w.c.
Do not attempt adjustment. Call local gas utility to decrease pressure.
Boiler valve must not be exposed to pressure over 14 ”w.c.
