1
H2
dy1
dy2
dy1
dy1
dy2
T
H2
H2
H1
H1
25-28
15-18
Ts1
Ts2
D
D-H1
D
D-H2
D
dy1
dy1
dy2
dy1
dy2
1. 2 independent single-stage thermostat
Heater function
Heater function
2. Dependent functions of 2 thermostats
Thermostat functions
3. Di erential thermostat
Legend:
Ts1 - real (measured) temperature 1
Ts2 - real (measured) temperature 2
T1 - adjusted temperature T1
T2 - adjusted temperature T2
H1 - adjusted hysteresis for T1
H2 - adjusted hysteresis for T2
dy1 - set switching delay of the output
dy2 - set delay on output breaking
15-18 output contact (for T1)
25-28 output contact (for T2)
Legend:
Ts1 - real (measured) temperature 1
Ts2 - real (measured) temperature 2
T1 - adjusted temperature T1
T2 - adjusted temperature T2
H1 - adjusted hysteresis for T1
H2 - adjusted hysteresis for T2
dy1- set switching delay of the output
dy2 - set delay on output breaking
25-28 output contact (for T2)
15-18 output contact (intersection T1 and T2)
Output contact switched until adjusted temperature is reached.
Hysteresis eliminates frequent switching. Heating/cooling func-
tion adjusted in the menu.
Output 15-18 is closed, if temperature of both thermostats is bel-
low an adjusted level. When any thermostat reaches adjusted lev-
el, the contact 15-18 open. Serial inner connection of thermostats
(logic function AND).
4. 2-stage thermostat
5. Thermostat with “WINDOW”
Legend:
Ts - real (measured) temperature T1
D - adjusted di erence
T1 - adjusted temperature T1
T=T1-D
H1 - adjusted hysteresis for T1
H2 - adjusted hysteresis for T
dy1- set switching delay of the output
dy2 - set delay on output breaking
15-18 output contact
25-28 output contact
Legend:
Ts - real (measured) temperature
T1 - adjusted temperature
T=T1-D
H1 - adjusted hysteresis for T1
H2 - adjusted hysteresis for T
dy1- set switching delay of the output
dy2 - set delay on output breaking
15-18 output contact
25-28 output contact
Typical example of use for two-stage thermostat is e.g in boiler-
room, where there are two biolers from which one is main and the
other one is auxiliary. The main boiler is managed according to set
temperature and auxiliary boiler is switched in case temperature
falls under set di erence. Thus it helps to the main boiler in case
outside temperature dramatically falls. In the range of set di er-
ence (D) output 15-18 functions as normal thermostat to input 1
(type 1). In case temperature falls under set di erence, output 2
switches.
Output is closed (heating) only if temperature is within adjusted
range.If temperature is out of range, the contact opens. T is set as
T1-D. The function is used for protection of gutters against freez-
ing.
Legend:
Ts1 - real (measured) temperature T1
Ts2 - real (measured) temperature T2
D - adjusted di erence
dy1- set switching delay of the output
dy2 - set delay on output breaking
15-18 output contact (for T1)
25-28 output contact (for T2)
Switching of output corresponds with input, which has lower
temperature when di ference is exceeded di erencial thermo-
stat is used for keeping two identical temperature e.g. in heating
systems (boiler and reservoir), solar systems (collector, reservoir
exchanger), water heating (water heater, water distribution)etc.
6. Thermostat with dead zone
Legend:
Ts - real (measured) temperature
T1 - adjusted temperature
T=T1-D
H1 - adjusted hysteresis for T1
H2 - adjusted hysteresis for T
dy1- set switching delay of the output
dy2 - set delay on output breaking
15-18 output contact (heating)
25-28 output contact (cooling)
In case of thermostat with a „dead zone“, it is possible to set tem-
perature T1 and a di erence (respectively a width of dead zone D).
If temperature is higher than T1, output contact of cooling switch-
es ON; if the temperature gets bellow T1, the contact switches
OFF. If the temperature gets bellow temperature T, the contact
of heating switches ON and it switches OFF when temperature T
is exceeded. This function can be used for example for automatic
air warming and cooling in ventilation so the sit is always within
the range T1 and T.
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