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BTH ULTRA Electric Boilers Installation & Operation manual (Revision: June 2015) 17
4.3 OPERATION OF THE INTERFACE
The controller uses four push buttons at the
bottom of the display to select and adjust the
parameters.
The button is used to access the
configuration menu and confirm a selection.
The buttons are used to
select an item or adjust a value.
The button enables the illumination of the
display under two different modes.
The default mode will enable the illumination of
the display for a period of 10 sec. each time a
button is pressed. If the is pushed, the light
will be continuously illuminated. Just press the
button to change the mode of activation.
Figure 16 : UltraSmart Control Module
4.4 OPERATION IN “FIXED BOILER
TEMPERATURE SET POINT”
For installation where the boiler target
temperature shall be maintained at a fixed
temperature that will not vary in relation to the
outdoor temperature, the sequence of operation
will be as follow:
On a call for heat from the room thermostat, the
circulating pump will start and the boiler will
activate the number of stages required to get to
and maintain the outlet temperature of the boiler
near the selected target temperature. A rotation
of the stages based on an equal time period of
operation is provided.
N.B. The supplied outdoor temperature sensor
shall not be connected before applying the
electrical power to the unit
4.5 OPERATION WITH “OUTDOOR
RESET”:
For installation where the boiler target
temperature shall modulate in relation to the
outdoor temperature; when the outdoor
temperature gets colder, the boiler target
temperature will increase.
On a call from the room thermostat, the
circulating pump will start and the boiler will
activate the number of stages required to get to
and maintain the outlet boiler temperature near
the target temperature established by the
controller according to the outdoor temperature.
A rotation of the stages based on an equal time
period of operation is provided.
N.B. The supplied outdoor temperature sensor
must be connected before applying the electrical
power to the unit.
The boiler target temperature will be calculated
by the controller in relation to the parameters
selected in the menu
and the
maximum target temperature required when the
outdoor temperature will get to -10°F (-23°C).
The “STD” curve corresponds to the default
maximum temperature for a typical system and
this value can be modified from the “MIN” to
“MAX” value shown on the following tables.
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