Page
9
Inclination of the
curve
Offset
Factory settings
1,5
0
Room temperature is too low
if the external temperature is
above + 5
o
C
Change with the first
lower curve
Add with
offset
+ 6
o
C
Room temperature is too low
if the external temperature is
b 5
o
C and - 5
o
C
Leave the curve 1,5
Add with offset
+ 3
o
C
Room temperature is too low
if the external temperature is
below - 5
o
C
Change with the first
higher curve
Leave offset
0
o
C
Room temperature is too high
if the external temperature is
above + 5
o
C
Change with the first
higher curve
Lower with offset
- 6
o
C
Room temperature is too high
if the external temperature is
b 5
o
C - 5
o
C
Leave the curve 1,5
Lower with offset
- 3
o
C
Room temperature is too high
if the external temperature is
below - 5
o
C
Change with the first
lower curve
Leave offset
0
o
C
Sample of modified curve
In
a
combine
d
heating system, radiator and under floor
heating
,
or other heating elements, the
temperature of
water in the boiler has to be chosen in a way to achieve the highest desired
temperature. On the parts of heating where temperature of the primary flow has to be lower, one
element has to be built in such as motorized three
-
way valve that is controlled by room thermostat,
thermostat valve for limiting the temperature of the return flow or something similar.
1.4.5. Limiting the minimum and maximum temperature of water in the boiler
1.5. Functionality of hot domestic water
1.5.1. Availability
If the heating curves and offset are selected correctly and room temperature is falling
,
in transitional
period in heating seasons (
autumn
, spring) minimal temperature of water in the boiler has
to be
changed.
If a
building cannot accumulate
heat (sudden and short warming during the day) necessary
temperature of
water in the boiler will be too low and will not keep up the desired room temperature.
Limitation of the maximum temperature of
water in the boiler serves more as a protection. Factory
setting is at
90
o
C, and we
suggest lowering it at approximately
80
o
C. Limitation of
the maximum
temperature of water in the boiler is also used in central heating and domestic water preparation
system, an
d
because of that it is not advisable
to lower that temperature too much because the
domestic water will warm up slowly on higher temperatures.
It is possible to pr
oduce
domestic
hot water
in
an indirect
water
cylinder
with heat
exchanger
by
using
T
h
ermo
Extra
.