Hamworthy STRATTON MK3 Series, Инструкция по установке, наладке и обслуживанию

Страница: 35 / 154

06.02.2023 35 / 154
STRATTON MK3 - Installation, Use and Maintenance
4.5. Changing gas (G20 to G31 for only 40 to 120 kW boilers)
This STRATTON MK3 boiler has been adjusted in the factory to work with
group H (type G20) natural gas with a supply pressure of 20 mbar.
IMPORTANT:
Any operations involving changing the type of gas used must be
performed by a qualified professional.
The valve must be adjusted on the boiler operating at the maximum power and
the minimum power. To change gas type, use the operation mode "Manual
power adjustment" (see point 3.3.4 in the instructions for the NAVISTEM
B3100 boiler controller) which enables the user to switch straight to the
minimum or maximum setpoint value (i.e. to zero or full power).
IMPORTANT:
The settings have been approved for the gas supply pressures at the
valve inlet (measured on the pressure meter before the gas valve and
with the burner working) in the following tables.
CAUTION:
Since the combustion is adjusted with the door open, check that the
combustion is clean after installing the front door.
CAUTION:
The setting mechanism must be sealed once the operation is complete.
All damaged seals must be replaced.
4.5.1. installing the propane injector
IMPORTANT: ONLY for 70, 80,100 and 120 kW boilers.
Change the type of gas by installing an injector at the gas valve outlet.
Close the gas feed valve and switch off the electric power supply.
Disconnect the electric cable and connect on the gas valve.
Unscrew the nut upstream of the valve and the 4 screws (see figure 11 below)
and remove the valve from the boiler.
Unscrew the 4 screws of the elbow flange (see below).
Install the injector.
Reassemble the whole.
IMPORTANT:
Always replace the washers on the two nuts.
Check the seals.