Technical data

26 Installation and maintenance manual atmoCRAFT
Caution!
Do not add frost or corrosion preventative to
the heating water!
If frost or corrosion preventative is added to
the heating water this can cause changes in the
seals and can cause noises to be created during
the heating process.
Vaillant assumes no liability for this and such
consequential damages.
Please inform the user of the procedure for
frost protection.
If the heating water hardness is above 3,6 mol/
m
3
(20 °dH) it should be softened. To do this
you can use the ion-exchanger, Vaillant spare
part number 990 349. Please observe the
enclosed operating instructions.
6.1.2 Preparing for operation
Proceed as follows to prepare the installation
for operation:
• Fill the heating system to the required water level (at
least 1.0 bar in closed systems) and bleed the air.
• Open the gas-cock in the gas line.
• Turn the main switch on.
• Check the gas connection pressure.
• Check the set gas volume.
• Perform an exhaust gas loss measurement to set the
optimum combustion technology efficiency.
• If an indirectly heated hot water storage tank is
incorporated, start it up. Observe the relevant
installation and operating instructions.
• Check all the control, regulation and monitoring
devices for correct operation and correct adjustment.
• Make the customer acquainted with the operation of
the unit and hand over the instruction manual
associated with the unit for suitable storage.
• Recommend a maintenance contract to the customer.
6.2 Checking the gas setting
6.2.1 Default setting
The boilers are set in the factory for natural gas 2E/2H
(G20 - 20 mbar; Wobbe value 15.0 kWh/m
3
). Burner
setting for natural gas 2E and 2H is not required. The
gas pressure regulator on the gas fitting is sealed.
Caution!
Before start-up of the unit compare the details
concerning the set type of gas on the
identification plate with the type of gas supply
and gas family at the installation site.
If the unit version does not correspond to the local gas
family:
- The boiler must be changed over to the relevant gas
family before start-up.
The changeover must only be carried out by a heating
engineer using the original changeover sets available
from the factory to accommodate a different gas family.
Observe the changeover instructions included with the
changeover set.
6.2.2 Checking the connection pressure (gas flow
pressure)
2
1
Fig. 6.1 Connection pressure measuring connection
Proceed as follows to check the connection pressure:
• Turn the boiler off.
• Close the gas-cock in the main gas infeed line to the
boiler.
• Remove the screw on the connection pressure
measuring connection (1) and connect a suitable
pressure gauge.
• Start the boiler up in accordance with Chapter 6.
• Measure the connection flow pressure on the pressure
gauge.
6 Start-up