BTH Electric Boilers USE & CARE MANUAL
(Revision June.2014)
, Page
13.
buttons are pressed again the offset value will
change up to a value of + -10F(5C) from the
original setting made in the configuration menu.
The new value will blink during 5 sec. and the
display will then go back to the standard view
and the new target temperature will be shown.
Afterward, when the
button will be pressed, it will show the value of
the offset made previously and can be re-
adjusted.
Boost system operation
The controller incorporates a unique feature that
enables the target boiler temperature to automatically
be increased when the building heat load increases
but cannot be fulfilled with the actual boiler target
temperature and consequently the room thermostat(s)
cannot be satisfied within a pre-determined period.
Example:
-Return to normal heat load after low demand periods
occurring during sunny days.
-Long periods without heating which needs higher
boiler temp. to recuperate.
-Return
to
normal
room
temperature
after
thermostat’s “nights set back” program
.
80F
27C
70F
21C
60F
15C
50F
10C
10F
-12C
40F
4C
30F
0C
20F
-7C
0F
-17C
-10F
-23C
-20F
-29C
70F/21C
80F/27C
100F/-38C
90F/32C
110F/43C
120F/49C
130F/54C
Température ext. / Outdoor temperature
T
e
m
p
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co
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si
g
n
e
/
T
a
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t
te
m
p
.
NOR
MAL
BOO
ST
HAUSSE AUTOMATIQUE DU POINT DE CONSIGNE
« BOOST »
AUTOMATIC INCREASE OF TARGET TEMPERATURE
The controller will engage the “Boost” program
when the heat demand on terminals W&R has
been maintained for a pre-determined period
according to the type of selected application.
Once this period has been reached, the “Boost”
icon will appear on the display and the boiler
target temperature will start increasing very
slowly over a pre-determined period and up to a
pre-calculated maximum value until the heat
demand applied on W&R terminals has been
completed.
On a new heat demand, the previous boost
period is forgotten and the boiler target gets
back to its original setting
If the system is in “boost” most of the time, this
means
that the
boiler
target parameter
established during “Setting procedure” would be
too low for the heating system on which the unit
is applied. This boiler target could simply be
gradually increased by pressing the + button or
by re-setting the operating parameters using the
tool menus.
N.B. The boost program is a marvellous feature
that works fine on applications where the
number of room thermostats is in limited quantity
otherwise it may happen that during very cold
periods the heat demand from all the
thermostats may not become satisfied.
If your application needs the boost program to
be cancelled, you can do it by pressing the
button
for 6 sec. and the display will show
icon and the two options ON or OFF will blink
and can be selected using the + - button. The
controller will register the selected option and
return to normal operation if the buttons remains
untouched for 5 sec. or if the
button is
pressed.
