17
12 DIMS01-TH01 modulation electronics
Description of setting elements:
Jumper
JP1
– gas type selection
(natural gas / propane) – interconnection 2-3 = natural gas,
interconnection 1-2 = propane
Dip-switch
(Boiler type and parameters changing switch)
DS1-DHW
DS2- ext.
sensor
DS3 - cascade
DS4
DS5
DS6
OFF
tank
without ext.
sensor
slave
ON
through-flow
with ext.
sensor
master
microswitch
test
Factory setting:DS1- according to the boiler type; DS2-OFF (mode 1.1), DS3-OFF;DS4-OFF, pump
run-down 50% = 5 minutes; anticycling time 50% = 5 minutes; gas selection (JP1) depending on the
order.
Description of operation:
1.1
Mode: Heating up the system without weather compensated regulation
Setting: Outside sensor not connected, service buttons DS2, DS3 – OFF.
The boiler starts working when the room thermostat closes (the mode switch being in the winter
position). The pump and ignition automatics start operating too. The boiler is ignited at the set starting
output. This is kept for 2 seconds after ignition (the feedback of the ignition automatics). Then the output
is lowered to the minimum with slow linear rise (approximately 1 min.) up to the modulation point. The
point value depends on the factory setting of the max. heating output. The boiler output control at this
moment is PID (proportionate/integral/derivative) while the temperature set on the control panel knob is
maintained (within 35 – 80
o
C). When heating the system with a lower input than the minimum boiler
output is the outlet heating water temperature exceeds the set temperature by 5
o
C. At this moment the
boiler stops burning, but the pump is running and the re-ignition is restricted for some time (the factory
setting is 0 – 10 minutes). All this means the boiler is highly flexible heat source from the point of the
number of consequently controlled heating systems (e.g. zone regulation, thermostatic valves, etc.).
When the room thermostat opens, the pump runs down in the set time (the factory setting is 0 – 10
minutes). This function is used to cool down the exchanger, to drain heat from the combustion chamber
and to balance the temperatures of different heating elements (useful mainly for horizontal distribution
systems) when room thermostats with PI link with short operating cycles (e.g. Honeywell CM707).
1.2
Mode: Heating up the system with weather compensated regulation
Setting: Outside sensor connected, service buttons
DS2 – ON, DS3 – OFF
.
The boiler operates on the same basis as above. The only difference is the temperature of the heating
system is controlled depending on the outside temperature (measured by the outside sensor). The
calculation of the necessary temperature of the heating system is a function of the outside temperature and
factor
„K“
(weather compensation curve inclination). The factor is set by the service technician according
to the nature of the place and the heating system. The user can set the demanded heat comfort with the
heating water temperature knob on the control panel (the curve can be changed in the range of
±
15 °C of
the heating water).
The weather compensation curve is calculated for the standard heating system with radiators.
