14
THERM 90 KD.A
!
The mentioned ad-in regulators are not (with the exception of special offers) included in the delivery of the boiler!
Description of the activity of the boiler in the mentioned regime:
The working phase of the boiler starts by switching on the room thermostat (the thermostat evaluated low temperature
compared with requested) at the moment when the regime control knob is in the winter regime position. The three-way
valve relay is disconnected (for boilers with water storage heating); the of circulating pump is activated, as well as the ignition
system and ventilator. Ignition of the boiler is for the adjusted starting output. It remains for 2 seconds after activation of the
boiler. The output is then decreased to the minimum with a slow linear start (about 50 s) to the modulation point stated by
service for setting the maximum heating output. The regulation of output of the boiler in this phase is by PID (proportional/
integral/derivative) with keeping the temperature set by the wheel on the control panel (within the range 30 – 80 °C). During
the whole time of heating, the regulation limit of the output temperature is checked. When heating the system with lower
input power than the minimum output of the machine, there is an increase of the output temperature of heating water by
3 °C above the adjusted temperature (for 30 seconds from ignition, this value is increased to 10 °C). In this phase the boiler
interrupts the burning while still running the circulating pump and activates the restriction of reignition (service setting within
the range 0 – 10 min.). In this manner the boiler becomes a highly adaptable source of heat due to the high variability of the
consequently regulated heating sets (e.g. use of zone regulation, thermostatic valves, etc.).
After disconnection of the spatial thermostat or after switching the selection unit into the “WINTER“ mode, the burning of
the burners is stopped and the pump is ON for the set time (service setting within the range 0 – 10 min.). This function is
used for taking the heat from the condensing body and for improving the allocation of temperatures of bodies when using
thermostats with PI linkage with short working cycles.
In the case of the installation of the room thermostat eventually. and controller in the reference room, a minimum
of one radiator must be left without a thermostat head. To increase thermal comfort, we recommend not to
mount thermostatic heads on radiators in the reference room at all.
2.3.3 Operation of the boiler using built-in equithermal regulation
This regime is accessible in the boiler in the standard variant but is not activated. The activation and the primary setting of
the regulation is performed at the request of the client by an authorized service technician.
During equithermal regulation the boiler changes the temperature of the heating water automatically according to the
changes in the outside temperature.
This manner of regulation can only be used with the connected outside temperature sensor. The outside sensor is located on
the coldest wall of the object (north or north-west) approximately 3 m above the ground. The sensor must not be influenced
by any other thermal influence such as open windows, sunlight, ventilation shafts, etc.
Description of the activity of the boiler in this regime:
The working phases of the boiler are identical with the previous regime with the difference that the temperature for the
heating system is automatically set according to the outside temperature (ascertained by the sensor). The calculation of the
requested temperature of the heating system is the function of the ambient temperature and the function of the “K“ factor
(declination of equithermal curve), which is set by the service technician with respect to the locality and nature of the heating
system. Using the heating water knob on the control panel, the user sets the requested thermal comfort (correction of the
shift of equithermal curve within the range ± 15 °C of the heating water). The equithermal curve is modified for standard
heating systems with radiators.
In the case of failure of the ambient temperature sensor, this status is signalled by E07 failure and the boiler continues in
operation with the temperature of the heating system according to the setting in the previous regime (without equithermal
regulation).
Adjustment procedure:
When setting the equithermal regulation, it is necessary to distinguish the declination and the shift of the equithermal curve. By
setting of
the declination
the following rule applies : in the case of poor thermal-insulating properties of the object, change
the parameters of the declination of the curve
in the direction of the higher values (the curve
is moved upward); in the case of good thermal
insulation, the parameter can be decreased (the
curve is moved downward).
The declination of the curve is set by the
authorized technician in the service menu of
the automatic control system of the boiler!
