Erato GP20+ - Nominal Thermal Load of the Burner

Instruction manual for installation and operation of automatic pellet burner “ERATO GP20+”
(Version : 02.02.2010 10:36) p. 31/50
It is highly recommended to adjust the initial quantity (so called “initial doze”)
of the fuel in order to ensure efficient and safe ignition process and reliable
operation of the pellet burner.
It is highly recommended to perform adjustment of the air flow rate by adjusting
the position of the air control flap in order to achieve optimal combustion
process, i.e. low pollutant concentrations (pollutants are CO, unburned
hydrocarbons, NOx) in the flue gases and low air excess ratio. The adjustment
process should be performed by a trained technician by using gas-analyzer
measuring equipment.
5.2.7. Nominal thermal load of the burner
After the pellet burner has been started successfully (the fuel in the
combustion chamber is ignited) and the heat consumer unit, which demands heat
energy is heated up and tempered, one could assume that the system: burner-
heat consumer unit are in steady-state mode and thermally tempered. The
adjustment process should be performed in such steady conditions, followed by
appropriate air control flap adjustment. In this mode an installer should perform
so called “warm test” of the system, following the active norms and
requirements.
Note : It is not recommended to operate the burner at thermal load lower than
minimal thermal capacity, indicated in its technical information, as such
conditions are characterized with decreased efficiency. If the unit should operate
at thermal capacity, lower than nominal operation mode, one should perform
local adjustment of the operating parameters of the burner – both the thermal
capacity and the air flow rate, in order to ensure high efficiency and high
reliability of the system;
ATTENTION: Air flow rate considerably influence the operating mode of the
burner and the overall system performance and efficiency – if the air flow rate is
less than required, than the fuel is partially unburned due to low mixing
intensity and decreased combustion efficiency. In case that the air flow rate
exceeds the optimal air flow rate (for the operating thermal capacity of the
burner) the result will be also a sensible decrease of the combustion efficiency
due to intensive cooling of the combustion process and respectively increased
amount of unburned fuel as well. The above mentioned characteristics should be
carefully considered and appropriate adjustment of the combustion process
properties should be set-up, utilizing gas-analyzer in order to achieve high
efficiency and economic performance of the system.