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BTH ULTRA Electric Boilers Installation & Operation manual (Revision: June 2015) 21.
the + button or by re-setting the operating parameters
using the tool menus .
The Boost menu can be cancelled by selecting “OFF” in
the Boost menu.
4.11 OPERATION IN DUAL-ENERGY:
In Dual-energy mode, the display will indicate that this
mode is active in showing the icon
If it is not shown, check the position of the switch
located at the back of the controller. It must be set to
“Bi-Energ” position.
N.B. The controller will have to be reset to register the
new mode of operation. Just turn the power OFF and
back ON to the unit.
Operation in Dual-energy with Electric
When the authorisation signal to operate in electricity is
received, (close contact between E
1
&E
2
), the following
icons will be shown.
The circulating pump and the heating elements will be
activated according to the operating parameters
established earlier.
Operation in Dual-energy with the auxiliary boiler
When the authorisation signal will be absent (open
contact between E
1
&E
2
), the following icons will be
shown.
Upon reception of a heat demand on terminals R W of
BTH ULTRA boiler, terminals P
1
&P
2
will be energized at
120volts and the pump will be activated. At the same
time, the contact will close on the “AUX” terminals to
activate the auxiliary boiler. This boiler will be activated
only when there will be a heat demand to the R W
terminals and when the auxiliary boiler temperature will
be lower than the settings of its own temperature
controls.
If a three way valve is used on the piping as shown in
fig.6, it will change position when the contact will close
on AUX terminals and it will be the end switch of the
valve that will give the signal to the auxiliary boiler to
come on. The water flow will then circulate only in the
auxiliary boiler.
Manual selection for the electricity or auxiliary
boiler mode.
If the user wishes to manually select the electricity or
auxiliary boiler operation, it can be done in following the
sequence below:
o Push on the button for 6 sec. and the
following icons will appear
The selection of the dual-energy or electric only or
auxiliary boiler only is made with the + - button. Once
the selection has been made it will be registered by
pressing the or by waiting for 5sec.
If the electricity only or auxiliary boiler only has been
selected, the corresponding icon and the icons will
blink to advise the user that an unusual heating mode
has been selected.
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