THERMO 2000 BTH ULTRA 6 User manual

BTH ULTRA ElectricBoilers
M odels ranging from 6 kW to 33 kW :
120/240 Volts ( 1 phase )
INSTALLATION & OPERATION MANUAL
Your BTH ULTRA Electric Boiler has been carefully assembled and factory tested to provide
years of trouble-free service. The following information and safety measures are provided to
enable proper installation, operation, and maintenance of this product.
It is imperative that all persons who are expected to install, operate or adjust this boiler should
read these instructions carefully.
Any questions regarding the operation, maintenance, service or warranty of this electric boiler
should be directed to the supplier.
When all installation steps have been completed, insert this installation manual in its original
envelope, and keep in a safe place (close to the boiler) for future reference.
THERMO 2000 INC. revision : April 2011
Printed in Canada

BTH ULTRA Electric Boilers USE & CARE MANUAL (Revision April 2011), Page 2.
Section 1: DIMENSIONS AND SPECIFICATIONS
Table 1: Electric Ratings for 120/240 VAC (1 phase) Electric Boilers:
Current
Amp
Model P
KW Heating
Elements
Total
with
Circulator
Elements
Stages
Electronic
Control
Power Relays
Main Contactors
Wire**
CU
90oC
Fuse
A
BTH ULTRA 6 6 25.0 30.0 2 X 3KW 2 1 1 2 8 40
BTH ULTRA 8 8 33.3 38.3 1X 3KW
1 X 5KW 2 1 1 2 8 50
BTH ULTRA 10 10 41.6 46.6 2 X 5KW 2 1 1 2 6 60
BTH ULTRA 12 12 50.0 55.0 4 X 3KW 4 1 1 4 6 70
BTH ULTRA 15 15 62.5 67.5 2 X 3KW
2 X 4.5KW
4 1 1 4 4 100
BTH ULTRA 18 18 75.0 80.0 4 X 4.5KW 4 1 1 4 3 100
BTH ULTRA 20 20 83.4 88.4 4 X 5KW 4 1 1 4 3 110
BTH ULTRA 24 24 100.0 105.0 4 X 6KW 4 1 1 4 2 150
BTH ULTRA 27 27 112.5 117.5 6 X 4.5KW 4 1 2 6 1 150
BTH ULTRA 30 30 125.0 130.0 6 X 5KW 4 1 2 6 1/0 175
BTH ULTRA 33 33 138.0 143.0 3 X 5KW
3 X 6KW 4 1 2 6 2/0 200
*Maximum current for circulator : 5 amps. (1/6 HP Max.)
** Models 6 to 24kW are also certified for Aluminum cables of higher gauge.
Electrical local codes may require different cable gauge.
Table 2: Connections sizes & Boiler overall dimensions
Connections sizes Boiler overall dimensions
Boiler Inlet 1 “NPT M Height 12 3/16 inches
Boiler Outlet 1 “NPT M Width 16 7/16 inches
Waterworks 1/2 “NPT F Depth 24 ½ inches
Safety valve 3/4 “NPT F Shipping weight 99 lbs.
Drain valve 1/2 “NPT F
Operating temperature : from 50°F to 190°F (10 to 90C)
Maximum operating pressure: 30 psi (207kPa)

BTH ULTRA Electric Boilers USE & CARE MANUAL (Revision April 2011), Page 3.
Figure 1 : Component identification
.
24 1/2"

BTH ULTRA Electric Boilers USE & CARE MANUAL (Revision April 2011), Page 4.
General Safety Precautions
Be sure to read and understand the entire Use & Care Manual before attempting to install or to
operate this electric boiler. Pay particular attention to the following General Safety Precautions.
Failure to follow these warnings could cause property damage, bodily injury or death. Should
you have any problems understanding the instructions in this manual, ask for help from
a qualified installer or technician.
Section 2: INTRODUCTION
The important safeguards and instructions
appearing in this manual are not meant to
cover all possible conditions and situations
that may occur. It should be understood that
common sense, caution and care are factors
which cannot be built into every product.
They are the responsibility of the person(s)
caring for and operating the unit.
2.1 LOCAL INSTALLATION
REGULATIONS
This electric boiler must be installed in
accordance with these instructions and in
conformity with local codes, or in the absence of
local codes, with the National Plumbing Code
and the National Electric Code current edition.
In any case where instructions in this manual
differ from local or national codes, the local or
national codes take precedence.
2.2 CORROSIVE ATMOSPHERE
The electric boiler should not be located near an
air vent containing a corrosive atmosphere or
high humidity. The limited warranty is void when
the failure of the electric boiler is due to a
corrosive atmosphere.
2.3 INSPECT SHIPMENT
Inspect the electric boiler for possible shipping
damage. The manufacturer’s responsibility
ceases upon delivery of goods to the carrier in
good condition. Consignee must file any claims
for damage, shortage in shipments, or non-
delivery immediately against carrier.
2.4 CHECK LIST
Please check the identification tag on the unit to
make sure you have the right model.
List of components shipped with the unit :
·Pressure relief valve set at 30 PSI.
·Drain valve.
·Outdoor temperature sensor
·Tridicator (temperature & pressure
gauge).
The electric boiler should not be located in
an area where leakage of the tank or water
connections will result in damage to the
adjacent area or to lower floors of the
structure. When such areas cannot be
avoided, a suitable drain pan or non-
flammable catch pan, adequately drained,
must be installed under the boiler.
The pan must be connected to a drain.
NOTE: Auxiliary catch pan MUST conform to
local codes.
!
CAUTION!
WARNING
!

BTH ULTRA Electric Boilers USE & CARE MANUAL (Revision April 2011), Page 5.
Section 3: INSTALLATION
The manufacturer’s warranty does not cover
any damage or defect caused by installation,
or attachment, or use of any special
attachment other than those authorized by
the manufacturer into, onto, or in
conjunction with the boiler. The use of such
unauthorized devices may shorten the life of
the boiler and may endanger life and
property. The manufacturer disclaims any
responsibility for such loss or injury
resulting from the use of such unauthorized
devices
3.1 SECURITY CONSIDERATIONS
Domestic and commercial installations have a
maximum design operating pressure limited to
30 psi (207 kPa) by a safety relief valve.
This boiler is designed to operate on a closed
circuit system operating between 50 to 190°F.
This boiler is designed to be used only in a hot
water heating system.
The hi-limit control of the unit is fixed and set at
212F (100C). If the heating distribution system
on which the boiler is installed requires a hi limit
controller set at a lower temperature, this
controller will have to be added to the system
and connected in series with the hi-limit installed
at the factory.
The heat transfer medium must be water or
other non-toxic fluid having a toxicity rating
or class of 1, as listed in clinical Toxicology
of Commercial products, 5th edition
3.2 LOCATION
The electric boiler should be installed in a clean,
dry location. Long hot water lines should be
insulated to conserve water and energy. The
electric boiler and water lines should be
protected from exposure to freezing
temperatures.
The electric boiler must be installed horizontally,
directly on the wall or on an adequate ground
support. On wall hung applications, use the
supplied wall mounting brackets. It is held on the
wall by four 5/16’’ lag screws. The openings are
located at 16’’ intervals (i.e. standard stud
spacing). When the first bracket is installed you
can hang the boiler on the wall (see figure 1).
The lag screws must be suitably anchored to
safely support the weight of the boiler including
water content, piping and wiring.
The electric boiler must be located or protected
so as not to be subject to physical damage, for
example, by moving vehicles, area flooding, etc.
All models can be installed on combustible floors
and in alcoves. Ambient temperature must not
exceed 90°F or 32°C.
3.3 CLEARANCE
Minimum clearances for adequate inspection
and servicing are listed in the following table:
Table 3: Boiler clearance
Left side 16 inches
Right side 6 inches
Top & Bottom of the boiler 6 inches
Front side of the boiler 24 inches
Back side of the boiler 0 inch
WARNING
!
!

BTH ULTRA Electric Boilers USE & CARE MANUAL (Revision April 2011), Page 6.
3.4 PIPING INSTALLATION
3.4.1 Type of installation
You will find below on figures 2 to 6 typical piping arrangement for the two main types of installation. The
first being as a self operating unit and the others being coonected to an auxiliary boiler in dual-energy.
Figure 2
Figure 3

BTH ULTRA Electric Boilers USE & CARE MANUAL (Revision April 2011), Page 7.
Figure 4
Figure 5

BTH ULTRA Electric Boilers USE & CARE MANUAL (Revision April 2011), Page 8.
.Figure 6
3.4.2 Boiler piping
The outlet of the boiler is located on the top side,
and the inlet of the boiler is located on the bottom
side of the boiler. They are steel pipes (1”male
NPT threaded connection) where the connections
are to be made.
Installing a union is recommended on the boiler
water outlet and inlet piping to facilitate boiler
disconnection for servicing.
Dielectric unions are required for protection of the
boiler and piping if dissimilar pipe material such as
galvanized steel and copper are present.
Use only clean pipe for boiler water lines. Local
codes or regulations shall govern the exact type of
material to be used.
Insulate all pipes containing hot water, especially
in unheated areas.
Install shutoff (ball) valves for servicing
convenience.
Cap or plug unused connections on the boiler. Do
not cap the pressure relief valve on the boiler
since it will damage and shorten the life of the
boiler and may endanger life and property.
3.4.3 Pressure relief valve
An automatic pressure relief valve must be
installed during boiler setup. The pressure rating
of the relief valve must not exceed 30 psi.
Connect the outlet of the relief valve to a
discharge line going to 6”above a floor drain,
away of any live electrical parts. The discharge
line must pitch downward from the valve to allow
complete draining by gravity of the relief valve and
discharge line, and be of a diameter no smaller
than that of the valve outlet. The tip of the
discharge line should not be threaded or
concealed and should be protected from freezing.
No valve of any type, restriction or reducer
coupling should be installed on the discharge line.
Local codes shall govern the installation of relief
valves.
3.4.4 Expansion tank
The increase in boiler water volume resulting from
higher temperature is stored in the expansion tank
during periods of high operating temperature and
is returned to the system when the temperature
decreases.

BTH ULTRA Electric Boilers USE & CARE MANUAL (Revision April 2011), Page 9.
If it is not properly sized, the system pressure will
get above the allowable operating pressure of
30psi (207kPa) and the pressure relief valve will
open. Contact your local heating distributor for
proper selection.
3.4.5 Pressure regulator
An automatic water feeding system must be
employed as required by codes. An automatic
fill valve must be used with a backflow preventer
as required, to maintain minimum system pressure
by supplying water to make up for leakage. The
minimum usual pressure is 12psi.
3.4.6 Air bleeder
Installation of manual or automatic air vent devices
prevents air from accumulating in the system. Air
vents should be installed at all high points to
remove trapped air during initial setup and to
ensure that the system is tight. Regularly purge
the air out of the system while taking care to avoid
personal injuries or property damage caused by
hot boiler water spray.
3.4.7 Pump selection
Performance characteristics of centrifugal pumps
are described by pump curves, which plot flow
versus head of pressure together with other
information such as efficiency and power. Consult
the manufacturer’s pump curves to select the
proper model or ask your pump dealer or your
HVAC wholesaler for a recommendation.
Table below shows required flow in relation to the
power capacity of the boiler and selected
temperature drop in the heating distribution
system. On System with baseboard heaters, 20F
temperature drop is normally recommended and
on radiant floor application a value of 10F is
generally used.
Table 4: Temperature rise vs flow rate (GPM)
BWTD
Model KW 10o
F 20oF 30oF
40oF
BTH ULTRA 6 6 4,1 2,0 1,4 1,0
BTH ULTRA 8 8 5,5 2,7 1,8 1,4
BTH ULTRA 10 10 6,8 3,4 2,3 1,7
BTH ULTRA 12 12 8,2 4,1 2,7 2,0
BTH ULTRA 15 15 10,2
5,1 3,4 2,6
BTH ULTRA 18 18 12,3
6,1 4,1 3,1
BTH ULTRA 20 20 13,7
6,8 4,6 3,4
BTH ULTRA 24 24 16,4
8,2 5,5 4,1
BTH ULTRA 27 27 18,4
9,2 6,1 4,6
BTH ULTRA 30 30 20,5
10,2 6,8 5,1
BTH ULTRA 33 33 22,5
11,3 7,5 5,6
3.4.8 Dual Energy piping
Piping connections between the two boilers can be
made in parallel or in series as illustrated in fig.
5&6.
When installed in parallel, a three way motorized
valve (1”NPTF) is used to guide the heating
system return water toward the appropriate boiler
according to the operating mode in demand. This
way, the oil or gas boiler is not maintained hot by
the return water when the operation is in
Electricity.
N.B.: Make sure to select the appropriate port A, B
and AB when making the connection of the piping
(see fig.6)
3.5 ELECTRIC CONNECTIONS
3.5.1 Main Electric supply
Wiring must conform to the National Electrical
Code and to state or local code requirements.
Wiring must be from a 120/240 Volt (single phase,
60 Hz) circuit protected by a properly sized
breaker. Wire gauge (3 wires+ground) must be
properly sized. Consult the boiler rating plate to
select the proper breaker and wire gage.
Models 6 to 24 kW are certified for CU/AL cables.
Aluminum cables being generally bigger than
copper.
3.5.2 Connecting the thermostat and
pump.
3.5.2.1 Single heating zone
Using a 18 gauge cable, connect a low voltage
thermostat to terminals T and T on the electric
panel (DO NOT apply any power to these
terminals).
Connect the pump directly to the CC 120volts
terminals of the boiler using a 14gauge cable.
N.B. The amperage drawn by the pump shall not
exceed 5A or 1/6HP

BTH ULTRA Electric Boilers USE & CARE MANUAL (Revision April 2011), Page 10.
A two stage thermostat could also be installed.
Then the second heating stage would be used to
activate the “Boost”program allowing the boiler
target to be gradually increased (see section
4.10).
3.5.2.2 Multi-Zone systems
qZoning with motorised valves
The components shall be connected in such a way
that when a thermostat is in demand, only the
corresponding valve opens. Connect the zone
valve end switch to terminals T and T on the
electric panel (DO NOT apply any power to
these terminals!). Proper connection of the valve
shall be made according to the manufacturer
instruction.
Connect the circulating pump to terminals CC
120v of the boiler
N.B. The amperage drawn by the pump shall not
exceed 5A or 1/6HP
Typical connection schematic below
Figure 7
qCirculator zoning
The components shall be connected in such a way
that when a thermostat is in demand, only the
corresponding pump is activated. Connect the low
voltage thermostat to the corresponding pump
relay (Honeywell #RA-832 or multipump relay) and
connect its auxiliary dry contact to terminals T and
T on the electric panel (DO NOT apply any power
to these terminals!).
The CC120V terminals will then not be used.
N.B.: Do not install a jumper between the TT
terminals of the boiler.
Figure 8
3.5.3 Outdoor sensor
If you wish that the target boiler temperature
modulate according to the outdoor temperature
(the target temperature will increase as the
outdoor temperature drops), the supplied outdoor
sensor will need to be connected to S1S1
terminals. It will need to be connected before
applying the electrical power to the unit.
The installation of the sensor enables also to stop
the operation of the boiler when the outdoor
temperature gets to a temperature when no need
for heating is required.
If you wish to operate the boiler at a fixed
temperature set point, do not install the sensor
before applying the power to the unit.
The sensor should be located on an insulated wall
exposed to outdoor temperature. The selected
location should best reflect the heat load of the
building. Generally a North wall except on a
building having large window areas exposed to the
South where the sensor should then be located.
The sensor shall be connected to S1S1 terminals
using 18ga. wires not exceeding 200ft. Do not
apply current to these terminals.
3.5.4 Dual-energy connection with an
auxiliary boiler.
The BTH ULTRA boiler is designed to enable the
installation on Dual-energy applications without
the need to install an interface controller between
the boilers and the electricity supplier authorization
signal. Upon the reception of that signal, the BTH
ULTRA will select the appropriate heating mode
and will activate the required boiler.
If the heating distribution system is equipped with
only one pump connected to the CC terminals of

BTH ULTRA Electric Boilers USE & CARE MANUAL (Revision April 2011), Page 11.
the boiler, it will be activated on heat calls from the
thermostat whatsoever the heating mode selected.
To do so,
oOpen the front access panel to the boiler
electric compartment where the controller is
mounted and position the switch located on its
back at “Bi-Energ”.
oInstall a 2 wire 18ga cable between the
contact (N/F close contact to allow the
operation in electricity, Red R wire and green
V wire of Hydro-Quebec) of the authorization
signal to terminals EcE2 of the electric boiler.
oIf the piping installation is made as shown on
fig.5 then without three way valve, install an
18ga two wire cable between boiler terminals
“AUX”and the TT terminals of the auxiliary
boiler.
oN.B. Le capacity of the AUX contact is
2A/24Vac max.
oSee the operating sequence in Dual-energy at
section 4.11.
oIf the installation is made as shown on fig.6,
then with a three way valve orienting the
heating return water only in the operating
boiler: Install a three wire 18ga cable between
the valve and the electric boiler terminals.
Following this, connect the end switch of the
valve (grey and orange wire) to the TT
terminals of the auxiliary boiler.
Figure10
Figure 11

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Figure 12
Figure 13

BTH ULTRA Electric Boilers USE & CARE MANUAL (Revision April 2011), Page 13.
Figure 14
Section 4 : ADJUSTMENT OF THE CONTROLLER
4.1 INTRODUCTION
The BTH Ultra boiler is mainly designed to be
installed on closed circuit applications where the
water of the heating system flows directly from the
boiler to the heating distribution system (Standard
parallel Piping system)
Two operation modes are then offered:
qFixed boiler temperature set point (the
outdoor sensor shall not be installed)
Or
qOutdoor reset
4.2 DISPLAYED INFORMATION
The electronic control uses an LCD display to
make all adjustments and to visualize the
operation of the system.

BTH ULTRA Electric Boilers USE & CARE MANUAL (Revision April 2011), Page 14.
Figure 15
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 themode of activation.
Figure 16

BTH ULTRA Electric Boilers USE & CARE MANUAL (Revision April 2011), Page 15.
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 -10F (-23C). 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.
The following tables show the values of the
target temperature that will be obtained in
relation to the outdoor temperature.
Figure 17: Radiant floor in concrete
Figure 18 : Radiant floor between joists
Figure 19 : Cast iron radiators
Figure 20 : Hot water baseboards

BTH ULTRA Electric Boilers USE & CARE MANUAL (Revision April 2011), Page 16.
4.6 PURGE DELAY OF THE PUMP
The controller offers the possibility to
stop the operation of the pump after an
adjustable delay once the heat demand has
been completed.
The following choices are offered:
-“OFF”The pump will stop immediately when the
heat demand has been satisfied. This selection
shall be selected on systems equipped with
motorised fast closing zone valves in order to
prevent noise from water hammering.
-“15 sec to 60 min”delay where the pump will
be kept running to enable the pump to circulate
water into the system to equilibrate the heat in
all the building.
-“ON”The pump is in continuous operation.
Required on particular heating distribution
systems.
4.7 AUTOMATIC HEATING
SHUT DOWN
When the outdoor sensor is installed and the
unit then operates in the “outdoor reset”mode,
the controller offers the user the possibility to
automatically stop the boiler when the outdoor
temperature reaches an adjustable value (0F (-
17C) à 105F (40C). This characteristic is
especially interesting on the following
applications:
-Heating systems equipped with many
thermostats where the user wants to prevent the
operation of the unit if one of the thermostats
has inadvertently been activated.
-Heating systems where the owner supplies heat
to a lodger
-Systems connected to a geothermic heat pump
where we do not want the electric boiler to be
operating unless the outdoor temperature drops
to a selected degree.
4.8 CONFIGURATION OF THE CONTROLLER
Since each type of heating distribution system is
designed to operate at water temperatures that
are particular to its operation, the proper
configuration of the operating parameters of this
particular system is important to maximize its
performance.
In order to do this, the installer will first have to
tell the controller if the application is in Dual-
energy with an auxiliary boiler. The selection is
made by selecting the position “Elect.”Or “Bi-
Energ”on the switch located at the back of the
controller. This selection will have to be made
before applying voltage to the unit. The default
setting is “Elect.”
Figure 21
This being done, the installer will have to access
the configuration menu by pressing the
button for 2 sec. until the first menu appears.
The selection of the item or value is made by
pressing the button and by
pressing the button to get to the next
menu. See table 1 below to visualize the menu
list that will gradually be displayed.
If the buttons remain untouched for a period of
10 sec., the controller will register the value of
the selection made and return to the regular
display position. It will also return to the regular
display after reviewing all the operating
parameters of the controller.
In case of a power failure, the parameters will be
restored as they were established before the
failure.
Table 5 below shows the presentation sequence
of the menus.

BTH ULTRA Electric Boilers USE & CARE MANUAL (Revision April 2011), Page 17.
Table 5 :
ITEM DESCRIPTION RANGE DEFAULT
Choose the units the user prefers to work with F0or C0F0
Select the type of heating system on which the
boiler will be installed.
-Radiant Floor in
concrete
-Radiant Floor between
joists
-
Cast iron radiator
Hot water baseboards
Adjust the maximum boiler target temperature
required to adequately heat the building when the
outdoor temperature is very cold.
-Radiant Floor in
concrete
85à 105F
-Radiant Floor between
jois
ts 110Fà140F
-Cast iron radiator 135F
à 165F
-Baseboard
160F à 185F
100F
125F
150F
175F
Select the purge period that the pump will be
running once the heat demand is completed.
Select OFF if the heat system is equipped with
electric zone valves.
OFF
15 sec. to 60min.
ON 30sec
Select the outdoor temperature at which no
heating of the building is required (the outdoor
sensor has to be installed) 0F à 105F 75F
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)

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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 + -
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.
OPERATION OF THE + - BUTTONS
Figure 22
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
“nights 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 TT 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 TT 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 Ec-E2 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.
Figure 23
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
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.

BTH ULTRA Electric Boilers USE & CARE MANUAL (Revision April 2011), Page 19.
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 Ec&E2), 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 Ec&E2), the following icons will be
shown.
Upon reception of a heat demand on terminals TT of
BTH ULTRA boiler, terminals C1&C2 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 TT
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:
oPush 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.

BTH ULTRA Electric Boilers USE & CARE MANUAL (Revision April 2011), Page 20.
Section 5: START UP OPERATION
Before operating this boiler, be sure to read and
follow these instructions, as well as the warnings
printed in this manual. Failure to do so can result in
unsafe operation of the boiler resulting in property
damage, bodily injury, or death. Should you have
any problems reading, following or difficulty in
understanding the instructions in this manual,
STOP, and get help from a qualified person.
Do not turn on the boiler unless it is filled with
water. Do not turn on the boiler if the cold water
supply shut-off valve is closed.
5.1 PREPARATORY STEPS
qMake sure that all the piping and electrical
connections have been made.
qFill the boiler and the heating system with
water.
qCheck for leaks.
qCheck the pressure reading at the temperature
and pressure indicator. It should be around
12psi.
qTurn On the electrical supply to the boiler with
no heat demand from the thermostat(s).
qCompletely eliminate all the air from the boiler
and the distribution piping system. To do so,
activate the circulating pump without the
heating elements. If the pump is connected
directly on CC terminals of the boiler, it can be
activated by selecting “ON”in the configuration
menu after having pressed
qAdjust the UltraSmart boiler temperature
controller as explained earlier and set the purge
delay of the pump to its normal operation
setting.
5.2 START UP
qSet the room thermostat ON to generate a heat
demand. The pump shall start. The heating
elements shall gradually come on and the boiler
temperature will increase.
N.B. A rapid check of the operation of all the boiler
components could be made by pressing simultaneously
the + and- buttons of the controller and maintaining
them pressed until all the components have come ON.
qMeasure the amperage value drawn by the unit.
It shall be around the value indicated on the
boiler name plate.
qPartially close the isolating valve at the outlet
of the boiler to reduce the water flow and
consequently slowly increase the outlet
temperature. The heating elements shall
gradually stop as the temperature increase and
gets near the target temperature.
qLower the adjustment of the room thermostat(s)
the heating elements shall stop and the pump
shall stop after the delay set on the controller.
qCheck the pressure reading on the gauge of the
unit. It should not be higher than 28psi when
the distribution system reaches its maximum
operating temperature. If the pressure gets to
that value, it may be because the expansion
tank is not large enough for the application.
5.3 COMPLEMENTARY CHECKS ON DUAL-
ENERGY INSTALLATIONS
qCheck the proper operation of the authorization
signal to operate on electricity or auxiliary in
simulating the operation of the signal on Ec and
E2 and verifying the change of the operating
mode.
N.B. On initial start up it may take a considerable
amount of time before the water reaches the target
temperature
Further adjustments may be necessary as you use your
boiler and the space heating system.
SAFETY PRECAUTIONS
!