36
Perform a combustion analysis.
1) In the combustion analysis of the warm air heater, combined with a modulating burner, the combustion
analysis must be done both at Qnom (nominal heat input), and at Qmin (minimum heat input). The
combustion, efficiency and hygiene values obtained, including those of NOx, must be recorded at these
two thermal flows.
2) To calculate NOx in mg / kWh, according to EN 17082: 2019 point 6.8.2.2.2, proceed as follows:
-
Take the values of NOx in mg / kWh at Qnom (nominal heat input) and NOx at Qmin (minimum heat
input) measured as in point 1).
-
Insert them in the following formula: NOx = 0.15 NOx nom + 0.85 NOx min (to obtain NOx
calculated).
For the ErP Regulation 2016/2281 / EU, STEP II ° the NOx value calculated must be ≤ 70 mg / kWh, considered on
the basis of the PCS (higher calorific value) which numerically is about 10% lower than that calculated on the basis to
the PCI (lower calorific value).
Any tolerances and uncertainties of measurement permitted by local authorities must be added to this value.
Territorial bodies can establish their own minimum energy performances and NOx values other than those indicated in
point 2.
Draw up a plant or plant booklet for mandatory registrations according to laws, rules, regulations and
prescriptions in force.
TRI THERMOSTAT
Tri thermostat is composed of a FAN, LIMIT2 and LIMIT
FAN (TR)-
fan thermostat, normally open.
Automatically start and stop the fan when the average air outlet temperature reaches a pre-set value.
The set point is fixed by moving the setpoint marker (2) on a brass screw.
This adjustment must be set to 40°C for models 30 and 60 and to 30°C for models 80 to 600.
Setting this value over, a delay on fan starting may be caused, so increasing fuel consumption and can cause
damages to the machine.
On the cooling phase, the thermostat stops the fan at about 14°C, lower his starting point.
Ø
For
all XP models, EXCEPT
for installations such as
PRESSURE STATIC
structure, the fan is operated as described
in paragraph FAN (TR).
Ø
For installation of
XP in PRESSURE STATIC STRUCTURE
the FAN must operate continuously to guarantee the
structure support. The electrical connections of the thermostat are performed in order to keep the fan always on (
see
ELECTRICAL DIAGRAMS below
).
LIMIT2
(STB)
Security limit thermostat for the burner, normally closed with manual reset e a with positive safety.
Direction of rotation of the fan(s)
Electrical board for 3Ph and 1Ph.
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