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BTH ULTRA Electric Boilers Installation & Operation manual (Revision: June 2015) 20.
Select the outdoor temperature at which no
heating of the building is required (the outdoor
sensor has to be installed)
0°F à 105°F
75°F
Note 1: Once the operating parameters have been set, the controller will automatically come back to
normal display screen. If the user needs to increase or decrease the target temperature, he can do it
without having to enter in the configuration menu (see the following section).
4.9 ADJUSTMENTS OF THE TARGET
TEMPERATURE BY THE USER:
By pressing the the end user has
the possibility to offset the programmed target
temperature without going through the tool menus.
When the + or- button is pressed, the value “0” will
appear and blink to show a “0” offset value from the
original settings. When the + or- buttons are pressed
again the offset value will change up to a value of + -
10°F (5°C) 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.
OPERATION OF THE + - BUTTONS
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
Temp. de consigne / Target temp.
NORMAL
BOOST
maximum
HAUSSE AUTOMATIQUE DU POINT DE CONSIGNE
« BOOST »
AUTOMATIC INCREASE OF TARGET TEMPERATURE
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
Temp. de consigne / Target temp.
NORMAL
Offset max
.
FONCTIONNEMENT DES TOUCHES
Offset min
.
4.10 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
temperature to recuperate.
-Return to normal room temperature after thermostat’s
“night set back” program.
Three “Boost” operating options are available when the
is pressed for 6 sec. The icon will appear and
the three options ON1, ON2 and OFF will be proposed.
Press the + - button to select. The controller will register
the selected item and will return to normal operation
after 5 sec.
Operation in “Boost” Option ON1 (default setting)
The controller will engage the “Boost” program when
the heat demand on terminals RW 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 RW 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
Operation in “Boost” Option ON2 (only offered on
installation not operating in Dual-energy)
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.
This option requires the installation of one or two stages
heating thermostats. The second stage of the
thermostat(s) will have to be connected to E
1
-E
2
of the
boiler and the option ON2 selected.
Then the Boost mode will be instantaneously started
increasing the target temperature when the signal from
the second heating stage will be received. The target
temperature will immediately start increasing.
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
Temp. de consigne / Target temp.
NORMAL
BOOST
HAUSSE AUTOMATIQUE DU POINT DE CONSIGNE
« BOOST »
AUTOMATIC INCREASE OF TARGET TEMPERATURE
N.B. 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
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