Technical data

STRATA2

6.3 firing the appliance

At the time of starting the appliance, the working gas pressure must be measured:

● The inlet working gas pressure must be measured at the inlet test nipple of the gas control valve.

(see fig 6.4a).

● Nominal pressure should be 20 mbar for the Natural gas and 37 mbar for LPG (Propane).

6.3.1 initial start up

Ensuring that the installation has been fully tested and having found everything in order, power can be

applied to the unit by switching the main switch (fig 6.2a) to the ON position. Now place the switch for

the lower module in the ON position. To be independent from the heat demand from the installation, press

the ‘Chimney Sweep’ button ONCE. The lower burner should ignite. If the appliance fails to start up, first

check whether all gas taps, including the one on the unit have been opened.

Electrically, there is fourfold start-up procedure, after which a fault is reported (by flashing warning on

the status display); press the RESET button for additional start up attempts. If the unit fails to start up

correctly, the adjustment screw (2) (see fig 6.4a) on the gas valve must be turned clockwise

turn, and

then attempt to restart the appliance.

Note: If the display fails to show a figure, the RESET button should be pressed.

The start-up cycle has the following stages:

● The combustion fan carries out an initial speed test at low speed – after which it will immediately

switch to:

● Start Speed; when this has been reached, the gas valve will open and the unit will start up at 50% of its

capacity.

● The safety time is 5 seconds, after which there is a stabilisation period for the flames, also lasting 5

seconds; this is followed by the units output being controlled via the RVA 47 cascade manager.

6.4 setting and adjusting the load

For checking purposes, or after installing a new gas control valve, there are two methods for setting the

correct load.

● By measuring the CO

percentage.

● Checking by means of the gas rate measuring method.

Emissions must be measured in the opening, in the upper front right of the heat exchanger module, by

first removing the test point cap. Refit test point cap when emissions checks have been completed.

Table 9

Unit Settings

For Natural Gas G20

Gas measuring method:

● Maximum load per Heat Exchanger – 213ft3/hour.

● Minimum load per Heat Exchanger – 42.6ft3/hour.

Note: Values measured at a boiler water temperature of circa 60ºC.

Type of Gas Natural Gas G20 Propane Gas

Wobbe (MJ/m3) 49.79 76.06

Calorific Value Gross (MJ/m3) 38.63 93.87

Max Load (%) 9 11

Min Load (%) 9.5 11.5