- 16 -
T
15-18
25-28
T1
Ts
H1
H2
D
dy2
dy1
dy1
dy2
dy1
dy2
dy1
dy2
dy1
H1
H1
H2
H2
15-18
25-28
T1
T2
Ts
dy1
dy2
H1
H2
D
dy1
dy2
dy1
dy2
dy1
dy2
dy1
dy2
dy1
dy2
H2
H2
H1
H1
T
2-stage thermostat
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 T2
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 T2
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 auxi-
liary. 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 erence (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 freezing.
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