Bertos MACROS 700 Série Mode D'emploi page 103

ATTENTION!
The figures mentioned in the chapters "GENERAL WARNINGS", "GAS MODEL INSTRUCTIONS" and "ELECTRIC
MODEL INSTRUCTIONS" are shown on the initial pages of this manual.
START-UP
Before starting the appliance, make sure that its
specifications (category and type of gas used) match those
of the family and group of the gas available locally.
If not, adapt the appliance to the gas family or group
required (see paragraph "Running the appliance on other
types of gas"). Carry out the start-up according to the
User's Instructions.
Testing power rating
Use the nozzles for rated output on the appliances.
Capacity can be of two types:
- rated output, as given on the data plate;
- reduced.
These nozzles are shown in the table "BURNERS".
The pressure of the gas supply must be within the
following fields:
- from 18 to 22.5 mbar for gases of the second family
(methane)
- from 27 to 37 mbar for gases of the third family (butane-
propane).
The appliance will not work outside the above pressure
thresholds.
To adjust the power to minimum necessary, check the data
of the "BURNERS" TABLE.
If you wish to check the rated output further, you may
do so by using a gas meter according to the so-called
"volumetric method".
However, it is normally enough to simply check that the
nozzles are functioning correctly.
Checking input pressure (Fig. 6)
The input pressure should be measured by using a gauge
(min. resolution 0.1 mbar).
Remove the screw (A) from the pressure socket and
connect the gauge; after measuring, retighten the screw
so that it's absolutely airtight (A).
IMPORTANT: The pressure must be checked with all gas
equipment connected and operating.
Check the power according to the volumetric method
Using a gas counter and a stopwatch, you can measure the
gas consumption in a given unit of time. This value will be
compared with the value E, which is calculated as follows:
Burner power
E =
Gas heating power
It's important that the power is measured when the
appliance is in a state of inertia.
Both rated and reduced powers, calculated at the rated
pressure value, are obtained by referring to the "BURNERS"
table. The value of gas heating power can be requested
from the local gas company.
Checking the operation
Ensure that the type of used nozzles corresponds to that
shown in the "BURNERS" table. Check whether the pressure
reducer has a flow rate greater than the sum of the
consumption flow rate of all connected equipment. Check
that the gas supply pipes are adequate.
Checking the pilot light
When correctly adjusted, the pilot light will completely
surround the thermocouple; if it does not, check to see if
the used injector is suitable for the type of gas.
Checking primary air
The air flow is correctly adjusted when there is adequate
protection from the flame rising when the burner is cold
or flame returns when the burner is hot. See the "BURNERS"
table for the measurement of primary air for combustion.
Checking the functions
- Start the appliance;
- Check the gas pipes for leaks;
- Check the burner flame, even at the minimum.
Notes for the installer
Explain and demonstrate how the appliance works to the
user according to the instructions, and hand him the user's
manual.
Remind the user that, in the event of any structural
alterations or modifications to the room that houses the
appliance, the appliance functions must be rechecked.
Running the appliance on other types of gas
To change over to another type of gas, for example from
methane to liquid, use the correct type of nozzles for the
burner in accordance to the "BURNERS" table.
The burner nozzles for different types of gas, marked in
100ths of a mm, are in a case supplied with the appliance.
When the appliance has been transformed or adapted,
recheck its functions as described in the "Checking the
functions" paragraph.
After the appliance has been transformed or adapted,
specify the new gas type on the plate.
Minimum flow rate adjustment (Fig. 7)
Referring to the "BURNER" table, adjust the minimum flow
adjustment screw "B" as follows:
- when using liquid gas, tighten the minimum adjustment
screw all the way down.
- when using methane:
1. Locate the knob of the corresponding tap, turn the
burner on and put it at the minimum output position.
2. Adjust the minimum flow rate with screw "B" (Fig.
7). Unscrew to increase the flow rate and tighten to
decrease it.
| 103
EN