KJM MANDÍK
–
Detailed operating instructions
M&C KJMPNO 07/2022
MANDÍK, a.s.,
40
Gas heating
6.9
The gas heating burner is controlled based on the selected regime and required
temperature in conjunction with temperature sensors and the burner bypass damper, if installed.
The Monzun burner inserts from Mandík a.s. or burner inserts with burners from other
manufacturers can be installed. The burners can be single-stage, two-stage or modulating. The
maximum value of 100% modulation burner corresponds to the maximum power of the heat
exchanger in kW according to the documentation. The minimum value of the actual output is set
when the burner is commissioned and corresponds to the minimum output of 0%. During normal
operation, the burner will only turn on if the fans are running. The burner operation is indicated
by its indicator light on the control box. In transitional periods (spring and autumn) the number of
starts may be bigger than in the winter. However, too frequent burner starts may indicate
incorrect operation of the entire AC unit.
Protective functions are provided by an emergency thermostat and temperature sensor in
the flue gas. The exhaust gases temperature sensor has the function of an operating thermostat
set at 200 °C. When this exhaust gases temperature is reached, the burner is switched off with the
fans running. Once the burner has cooled down below 80 °C, it will switch back on again, unless
another fault has occurred. The emergency thermostat is located behind the gas exchanger and is
fixed at 90 °C. When this temperature is exceeded, the emergency thermostat shuts off power to
the burner and operator intervention (thermostat reset) is expected to address the cause of this
condition. Turning off the power to the control while the gas heater is running will cause the
heater to overheat!
If the gas heater fails, the fan speed may decrease after the heat exchanger has cooled
down when parameter
ComponentsMachine
Fans
HeatErr
=
Compensation
. This condition
is indicated as
AuxilieryMode
–
CompenssationSpeed
on the controller display in the main menu.
State
– displays information about the gas heater operation.
Ready
– gas heating is not used.
Heat
– gas heating is in the heating regime.
TempSup
– supply air temperature is greater than the maximum allowable duct
temperature setting in
ComponentsMachine
TemperatureRegulation
MaxSupplyTemp
.
