THERMO 2000 ECO ULTRA 4.5 Instruction and safety manual

ECO ULTRA
Electricthermalmassboiler
Power capacity : 4.5 kW to 29 kW :
120V- 208/240V (single phase)
INSTALLATION, USE AND CARE MANUAL
Your ECO ULTRA electric boiler has been carefully assembled and factory tested to provide
years of trouble-free service. This manual contains instructions for the safe and proper
installation, operation and maintenance of the boiler, in order to ensure your full satisfaction.
It is imperative that all persons who are expected to install, operate or adjust this boiler read
the instructions carefully.
Any questions regarding the operation, maintenance, service or warranty of this water heater
should be directed to the dealer or distributor you purchased it from. When all installation
steps have been completed, replace this installation manual in its original envelope, and keep
in a safe place near the heater for future reference.
THERMO 2000 INC. Revision : June 2017
Printed in Canada

ECO ULTRA Electric Boiler Installation, Use and Care Manual (Revision June 2017), Page 2.
Table of contents
Section 1 : TECHNICAL SPECIFICATIONS......................................................................................................................................... 3
1.1POWER AND DIMENSIONS...................................................................................................................................................... 3
1.2 BUFFER TANK ......................................................................................................................................................................... 4
1.3 STORAGE TANK ...................................................................................................................................................................... 4
1.4 HYDRAULIC SEPARATOR....................................................................................................................................................... 4
1.5 BACK UP BOILER..................................................................................................................................................................... 4
1.5.1 Autonomous electrical mode ............................................................................................................................................. 4
1.5.2 Automatic transfer mode ................................................................................................................................................... 4
Section 2 : INTRODUCTION ................................................................................................................................................................ 5
2.1 LOCAL INSTALLATION REGULATIONS.................................................................................................................................. 5
2.2 CORROSIVE ATMOSPHERE................................................................................................................................................... 5
2.3 SHIPMENT INSPECTION......................................................................................................................................................... 5
2.4 TO VERIFY ............................................................................................................................................................................... 5
Section 3 : INSTALLATION .................................................................................................................................................................. 6
3.1 SAFETY MEASURES................................................................................................................................................................ 6
3.2 LOCATION................................................................................................................................................................................ 6
3.3 CLEARANCES.......................................................................................................................................................................... 6
3.4 PIPING INSTALLATION............................................................................................................................................................ 7
3.5 BOILER COMPONENTS........................................................................................................................................................... 7
3.6 SYSTEM SETUP..................................................................................................................................................................... 12
3.6.1 Connecting the boiler ...................................................................................................................................................... 12
3.6.2 Flow-check valve............................................................................................................................................................. 12
3.6.3 Pressure relief valve........................................................................................................................................................ 12
3.6.4 Expansion tank................................................................................................................................................................ 12
3.6.5 Water pressure regulator................................................................................................................................................. 12
3.6.6 Automatic Air Vent........................................................................................................................................................... 12
3.6.7 Heating pump.................................................................................................................................................................. 13
3.7 BOILER WIRING:.................................................................................................................................................................... 13
3.7.1 Main power supply .......................................................................................................................................................... 13
3.7.2 Heating pump wiring........................................................................................................................................................ 13
3.7.3 Outdoor temperature sensor............................................................................................................................................ 13
3.7.4 Room thermostat wiring................................................................................................................................................... 13
3.7.5 Automatic transfer mode wiring ...................................................................................................................................... 14
3.8 WIRING DIAGRAMS............................................................................................................................................................... 16
Section 4 : ADJUSTMENT OF THE CONTROLLER........................................................................................................................... 18
4.1 INTRODUCTION..................................................................................................................................................................... 18
4.2 DISPLAYED INFORMATION................................................................................................................................................... 18
4.3 OPERATION OF THE INTERFACE ........................................................................................................................................ 19
4.4 OPERATION IN “FIXED BOILER TEMPERATURE SET POINT” ............................................................................................ 19
4.5 OPERATION WITH “OUTDOOR RESET”: .............................................................................................................................. 19
4.6 PURGE DELAY OF THE PUMP.............................................................................................................................................. 20
4.7 AUTOMATIC HEATING SHUT DOWN.................................................................................................................................... 20
4.8 CONFIGURATION OF THE CONTROLLER............................................................................................................................ 20
4.9 ADJUSTMENTS OF THE TARGET TEMPERATURE BY THE USER:.................................................................................... 22
4.10 BOOST SYSTEM OPERATION............................................................................................................................................. 22
4.11 OPERATION IN AUTOMATIC TRANSFER MODE:............................................................................................................... 23
Section 5 : START UP OPERATION .................................................................................................................................................. 24
5.1 PREPARATORY STEP........................................................................................................................................................... 24
5.2 STARTUP & INSPECTION...................................................................................................................................................... 24
5.3 COMPLEMENTARY CHECKS ON AUTOMATIC TRANSFER MODE..................................................................................... 24
Section 6 : MAINTENANCE................................................................................................................................................................ 25
6.1 INTRODUCTION..................................................................................................................................................................... 25
6.1 AT ALL TIMES ........................................................................................................................................................................ 25
6.2 EVERY 6 MONTHS................................................................................................................................................................. 25
6.3 YEARLY INSPECTION............................................................................................................................................................ 25
Section 7 : TROUBLE SHOOTING..................................................................................................................................................... 26
7.1 TROUBLE SHOOTING TABLE................................................................................................................................................ 26
7.2 SPARE PARTS....................................................................................................................................................................... 28
Section 8 : OPTION DHW HEAT EXCHANGER................................................................................................................................. 31
ECO ULTRA LIMITED WARRANTY................................................................................................................................................... 40

ECO ULTRA Electric Boiler Installation, Use and Care Manual (Revision June 2017), Page 3.
Section 1 : TECHNICAL SPECIFICATIONS
1.1 POWER AND DIMENSIONS
Table 1: Boiler specifications 208V/240V/1ph.1:
Model
ECO ULTRA
Power
(kW)
Heating
Elements
Amperage2
Suggested
electrical
cable
at 240V3
Suggested
Breaker/Fuse
at 240V3
208 V
240V
208 V
240V
cu
al
4.5
3.4
4.5
1 x 4,5 kW
16.3
18.9
10
10
30
7.5
5.6
7.5
1 x 4.5 kW +
1 x 3 kW
27.2
31.2
8
6
40
9
6.8
9
2 x 4,5 kW
32.6
37.5
8
6
50
12
9
12
2 x 6 kW
43.5
50
6
4
70
15
11.2
15
2 x 3 kW +
2 x 4,5 kW
54.3
62.5
6
4
80
18
13.5
18
4 x 4,5 kW
65.2
75
4
2
100
20
15
20
4 x 5 kW
72.5
83.3
3
2
110
24
18
24
4 x 6 kW
87
100
2
0
125
274
20.3
27
6 x 4,5 kW
97.9
112.5
1
00
150
294
21.8
29
2 x 4,5 kW +
4 x 5 kW
104
120
1
00
175
1Electrical supply: 120/240V or 120/208V single-phase (L1 –N –L2) with three 90°C conductors, or two conductors
L1 –L2 if the boiler does not require power to a 120 VAC pump or accessories.
2Add the amperage of the circulating pump and other external accessories if they are connected to the boiler (max.
5A).
3A higher cable size could be required. In all cases the local electrical code has priority. The electrician has the
responsibility to select the appropriate size.
4These models are only available on the ECO ULTRA 70.
Maximum operating pressure on the tank: 207 kPa / 30 psi
Tank temperature range : 10°C to 88°C (50°F to 190°F)
1 kW = 3412 BTU/h
Table 2: Dimensions:
ECO ULTRA 50
ECO ULTRA 70
Height
56-7/16’’
66-7/16’’
Diameter
22’’
24’’
Depth (with door)
25-1/2’’
28’’
Weight
280 lb
380 lb
Heating supply
1’’ NPTM
1-1/4’’ NPTM
Heating return
1’’ NPTM
1-1/4’’ NPTM

ECO ULTRA Electric Boiler Installation, Use and Care Manual (Revision June 2017), Page 4.
1.2 BUFFER TANK
The ECO ULTRA boiler optimizes runtimes and
limits on/off cycling of the energy source(s).
When the minimum system load is lower than the
energy source’s minimum capacity, the system
will generate short cycles. This causes premature
wear of the equipment and substantially
decreases the system’s energy efficiency.
1.3 STORAGE TANK
Any hydronic heating system with the ECO
ULTRA stores energy like a battery. When a
demand is made for limited heating (for example,
when there is little difference between indoor and
outdoor temperatures) or when it is used with a
low-capacity energy source, the energy required
will first come from the tank’s thermal storage.
1.4 HYDRAULIC SEPARATOR
Adding an ECO ULTRA boiler to a hydronic
heating system helps to evacuate air, eliminates
impurities, and ensures the optimal functioning of
the pumps—not only for the energy source but
also for the distribution system.
1.5 BACK UP BOILER
The addition of an ECO ULTRA electric boiler to
a hydronic heating system acts as a back-up
source to the main renewable energy system.
The boiler can operate in two modes:
autonomous electrical mode or automatic
transfer mode.
For both modes, it is recommended to use the
outdoor sensor supplied with the equipment. The
outdoor sensor allows the boiler water
temperature to be modulated according to the
outside temperature. It also makes it possible to
stop the heating of the electric elements when the
outside temperature exceeds a certain
temperature. The use of these functions makes it
possible to optimize the start-up of the main
renewable energy system.
1.5.1 Autonomous electrical mode
By default, the boiler operates in autonomous
electrical mode where, on request of heat, the
ECO ULTRA boiler turns on the distribution
pump, reads the water temperature and activates
the electrical elements according to the
Parameters of the UltraSmart controller
independently if the main renewable energy
source is on or off.
In addition, for this mode, it is recommended to
adjust the setpoint of the renewable energy
source to a value greater than 10°F to 20°F than
the ECO ULTRA to reduce the start-up of the
electrical elements.
1.5.2 Automatic transfer mode
The boiler can also be operated in the automatic
transfer mode, where the ECO ULTRA electric
boiler turns on the distribution pump, reads the
water temperature and activates the electrical
elements if authorized by an external signal. The
elements are then switched on according to the
adjustment parameters of the UltraSmart
controller.

ECO ULTRA Electric Boiler Installation, Use and Care Manual (Revision June 2017), Page 5.
General Safety Precautions
Be sure to read and understand the entire Manual before attempting to install or operate
this unit. 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, STOP, and get 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.
These factors must be supplied by the
person(s) caring for and operating the unit.
2.1 LOCAL INSTALLATION
REGULATIONS
This ECO ULTRA electric boiler must be installed
in accordance with these instructions and must
conform to local regulation, or in the absence of
local codes, with the current edition of the
National Plumbing Code and the National Electric
Code. 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 supply containing halogenated hydrocarbons
or high humidity. The limited warranty is voided
when failure of the water heater is due to a
corrosive atmosphere.
2.3 SHIPMENT INSPECTION
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 TO VERIFY
Please check the boiler identification plate to
ensure you have the right model.
The following items are factory installed and
shipped with the unit:
207 kPa (30 psi) tank pressure relief
valve.
Tank drain valve
Thermo manometer (heat and
pressure indicator).
Automatic air vent.
Electric heating elements
ULTRA SMART™ controller.
The ECO ULTRA electric boiler should not be
located in an area where leakage from 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.
!
WARNING
!
WARNING
!

ECO ULTRA Electric Boiler Installation, Use and Care Manual (Revision June 2017), Page 6.
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 water heater. The use of such
unauthorized devices may shorten the life of
the water heater 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 SAFETY MEASURES
All installations will include a pressure relief valve
limiting the operating pressure to 207 kPa (30
psi).
This ECO ULTRA electric boiler is designed for a
maximum operating temperature of 88°C
(190°F). It is designed for hot water heating
systems only. When allowed by local regulation a
maximum 50% blend of water and antifreeze (
designed specifically for water heating systems)
may be used.
The boiler is equipped with an automatic high limit
temperature control set at 210°F (99°C) and
models sale in USA have a second limit device
manually re-settable set at 227°F (108°C). If the
heating distribution system on which the boiler is
installed requires a high limit controller having a
lower setting, this controller will be added to the
system and connected in series with the factory
installed limit control.
3.2 LOCATION
The ECO ULTRA boiler should be installed in a
clean, dry location. Long hot water lines should
be insulated to conserve energy. The boiler and
piping should be protected from exposure to
freezing.
The ECO ULTRA boiler must be installed levelled
and vertically. Adjustable legs allow for levelling
and stability.
The ECO ULTRA 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.
3.3 CLEARANCES
The minimal clearances required for proper
inspection and servicing are as follows.
Supplementary clearances could be required for
piping installation.
Table 3: Minimum clearances required
Left side
0 mm/ 0 ‘’
Right side
0 mm/ 0 ‘’
Top
127 mm / 5 ’’
Front*
75 mm / 3 ’’
Back
0 mm/ 0 ‘’
*If the installation is inside a closet with an access
door, ventilation openings could be required to
maintain the ambient temperature below 32°C
(90°F).
WARNING
!

ECO ULTRA Electric Boiler Installation, Use and Care Manual (Revision June 2017), Page 7.
3.4 PIPING INSTALLATION
Make sure that the installation complies with one
of the configuration shown below and that the
water circulation is done in the right way.
Figure 1: Possible installation configurations
3.5 BOILER COMPONENTS
Figures 2 and 3 show various components of the
ECO ULTRA electric boiler. Figures 4 and 6 show
some installation drawings of the boiler in the
autonomous electrical mode. Figures 5, 7 and 8
show some installation drawings of the boiler in
the automatic transfer mode.
Figure 2 : Components identification and location (top right side view)
Pressure relief valve (30 psi)
Automatic air vent
Temperature and pressure
indicator
Main Electrical Supply
Low voltage
connections
Heating supply
Model 50: 1” NPTM
Model 70: 1 ¼“ NPTM

ECO ULTRA Electric Boiler Installation, Use and Care Manual (Revision June 2017), Page 8.
Figure 3: Components identification and location (left side view)
Adjustable feet
UltraSmart controller
Heating elements
Heating return
Model 50: 1” NPTM
Model 70: 1 ¼“ NPTM
Electrical components
mounting panel
Drain valve
Heating supply
Model 50: 1” NPTM
Model 70: 1 ¼“ NPTM

ECO ULTRA Electric Boiler Installation, Use and Care Manual (Revision June 2017), Page 9.
Figure 4: Basic dual energy Installation drawing for radiant floor.
Figure 5: Dual energy Installation drawing for radiant floor and wood boiler.
RA89
34
21
ECO ULTRA INSTALLED WITH WOOD BOILER
AUTOMATIC TRANSFER MODE
Legend
Outdoor sensor
Circulating pump
Room thermostat
Pressure and temperature
indicator
Drain valve
Automatic air vent
Air seperaor
Service valve
Pressure relief valve
Union
Expansion tank
Pressure regulator
Thermostatic mixing
valve
Chaudière au bois
ECO ULTRA
Back flow preventor
TT
120 V
EE
ECO ULTRA INSTALLED WITH WOOD BOILER
AUTONOMOUS ELECTRICAL MODE
Legend
Outdoor sensor
Circulating pump
Room thermostat
Pressure and temperature
indicator
Drain valve
Automatic air vent
Air seperaor
Service valve
Pressure relief valve
Union
Expansion tank
Pressure regulator
Thermostatic mixing valve
Wood boiler
ECO ULTRA
Back flow preventor
120 V

ECO ULTRA Electric Boiler Installation, Use and Care Manual (Revision June 2017), Page 10.
Figure 6: Basic dual energy Installation drawing for radiant floor and Air-to-water heat pump
Figure 7: Dual energy Installation drawing for radiant floor and Air-to-water heat pump
ECO ULTRA INSTALLED WITH AIR-TO-WATER HEAT PUMP
AUTONOMOUS ELECTRICALMODE
Legend
Outdoor sensor
Circulating pump
Room thermostat
Pressure and temperature
indicator
Drain valve
Automatic air vent
Air seperaor
Service valve
Pressure relief valve
Union
Expansion tank
Pressure regulator
Thermostatic mixing
valve
Air-to-water heat pump
ECO ULTRA
Back flow preventor
EE
ECO ULTRA INSTALLED WITH AIR-TO-WATER HEAT PUMP
AUTOMATIC TRANSFER MODE
Legend
Outdoor sensor
Circulating pump
Room thermostat
Pressure and temperature
indicator
Drain valve
Automatic air vent
Air seperaor
Service valve
Pressure relief valve
Union
Expansion tank
Pressure regulator
Thermostatic mixing
valve
Air-to-water heat pump
ECO ULTRA
Back flow preventor

ECO ULTRA Electric Boiler Installation, Use and Care Manual (Revision June 2017), Page 11.
Figure 8: Dual energy Installation drawing for radiant floor and Air-to-water heat pump
Diverter valve
ECO ULTRA INSTALLED WITH AIR-TO-WATER HEAT PUMP
AUTOMATIC TRANSFER MODE
Legend
Outdoor sensor
Circulating pump
Room thermostat
Pressure and temperature
indicator
Drain valve
Éliminateur d’air automatique
Air seperaor
Service valve
Pressure relief valve
Union
Expansion tank
Pressure regulator
Thermostatic mixing
valve
Air-to-water heat pump
ECO ULTRA
Back flow preventor
Cooling system
EE

ECO ULTRA Electric Boiler Installation, Use and Care Manual (Revision June 2017), Page 12.
3.6 SYSTEM SETUP
Figures 2 to 8 indentify and show location of the
different components. They also provide typical
heating system installation. External components
location may vary in order to accommodate
specific installation and local codes and
regulation.
3.6.1 Connecting the boiler
The boiler heating supply and return connections
are located on the left or right side and are 1”
NPTM for Model 50 and 1-¼’’ NPTM for model
70. The connections at the left or right can be
used. The important thing is that the fluid
circulation must be made from the bottom to the
top (see figure 1)
Unions are recommended on the inlet and outlet
pipes to disconnect the water heater easily for
servicing if necessary.
Dielectric (insulating) unions should be used if
copper-steel connections are made.
Insulate all pipes containing hot water, especially
in unheated areas.
3.6.2 Flow-check valve
If the heating system uses a single or multiple
circulators without motorized zone valves, a flow-
check valve must be installed to avoid all
possibility of gravity flow and heat loss during
non-draw periods. Modern circulators are
typically provided with spring loaded check valves
that will provide adequate protection.
If the heating system uses motorized zone
valves, these will provide adequate protection.
3.6.3 Pressure relief valve
The boiler is delivered with a factory installed tank
pressure relief valve set at 207 kPa (30 psi).
NEVER replace the pressure relief valve by a
higher set pressure one.
Connect the outlet of the relief valve downward
toward a safe location.
Relief valve outlet pipe diameter must not be of
smaller diameter than the relief valve outlet. The
oulet pipe end must be visible in order to observe
any relief incident and be protected from freezing.
NEVER cap or plug a pressure relief valve
outlet. The pressure relief valve is a safety
apparatus and preventing its proper operation
may cause death, injury or property damage.
3.6.4 Expansion tank
When operating the ECO ULTRA and the heating
system, pressure will vary between 83 kPa and
193 kPa (12 psi to 28 psi). The operating
pressure is affected by the type of heating system
and the size of the expansion tank installed.
The expansion tank is used to absorb the
increase of water volume from the boiler and the
system when it is working.
The model selection should be based on the
maximum working temperature and the water
volume of the total system. For example, a
system with radiators contains much more water
volume than a baseboards system. Likewise, the
ECO ULTRA also contains an important volume
of water that has to be added :
ECO ULTRA 50 : 48 usgal
ECO ULTRA 70 : 71 usgal
With this information, the installator or distributor
should be able to make an appropriate selection
for an expansion tank.
Here are some minimal recommendations for
different types of heating systems.
ECO ULTRA
Baseboards
Radiant
floor
Cast-iron
radiators
ECO ULTRA 50
#30
#30
#60
ECO ULTRA 70
#60
#60
#90
The expansion tank is generally installed on the
wall or ceiling. It also has to be well supported.
3.6.5 Water pressure regulator
The boiler should be installed in such a way that
it can automatically be fed with water in the event
of a pressure drop.
The minimum pressure obtained when the
system is cold is generally 12 psi (83 kPa).
This accessory shall be equipped with one or
more check valves to avoid all possibilities of the
boiler water returning to the potable water supply
network (local regulation should be applied)
3.6.6 Automatic Air Vent
The ECO ULTRA has a factory installed tank
automatic air vent. This air vent function is to vent
any air present in the tank.
For proper operation, do not cap or block the air
bleeder outlet.
For proper operation of the heating system, it may
be necessary to add air bleeders to the heating
system circuits.

ECO ULTRA Electric Boiler Installation, Use and Care Manual (Revision June 2017), Page 13.
3.6.7 Heating pump
A circulating pump (not included) is required for
the heating system to deliver heating fluid to the
different heating zones. Sizing of the pump is
base on the heating system configuration and is
done by the installator (heating technician,
plumber).
3.7 BOILER WIRING:
3.7.1 Main power supply
The electrical wiring and grounding must conform
to local codes or, in their absence, to the National
Electrical Code. Local codes have authority for
wiring and electric breaker sizing. It is the
electrical technician responsibility to insure that
the installation meets the applicable codes
requirements.
On installation where a 120 Vac power is required
for a heating pump and other outboard
components, main power supply to the ECO
ULTRA must be a 120/240 Vac, single phase, 60
Hz using 3 conductors (L1 –L2 –N) and a ground
wire.
On installation where no 120 volts external
components need to be powered by the ECO
ULTRA, Power supply could then be supplied
with only two conductors L1-L2 with a ground
wire.
Electrical current draw for the boiler being
installed is indicated on the boiler’s name plate.
The electrical technician needs this information in
order to determine the proper electrical breaker
and cable. The cable can be either aluminum or
copper, but must be adequate for 75°C operation.
If aluminum cables are used, it shall be of an
adequate size (generally bigger) and particular
consideration will have to be respected such as
the use of DE-OX inhibitors in order to meet the
National electrical code.
3.7.2 Heating pump wiring
If the building heating system is designed for a
single pump operation and the electrical power to
the boiler is 120/240 Vac 3 conductors and
ground type, the pump (1/6 HP max) can be
directly connected to the boiler electric panel “PP”
terminals. The boiler control will operate the
pump as soon as a heat demand is signalled by
the space thermostat.
3.7.3 Outdoor temperature sensor
If you want the boiler target temperature to
modulate according to the outdoor temperature
(when the outdoor temp. will get colder, the target
temperature will get higher). The supplied
outdoor sensor will have to be connected to S1
S1 before turning the power on to the unit.
The installation of this sensor cancels the
operation of the boiler when the outdoor
temperature exceeds the selected value
corresponding to the maximum temperature
required for heating.
This control strategy optimize the use of the main
renewable energy source by reducing the use of
electric elements of the ECO ULTRA boiler.
1. Sensor location:
-Outside the building at a location which best
represents the heat demand of the building (a
wall facing north for most of the buildings and on
a south one on buildings with large windows
facing south).
-It should not be exposed to external heat
sources (dryer outlet, window openings,
uninsulated walls).
-It should not be installed in a location where it
could be covered with snow.
2. Installation:
-Drill a 9/64” dia. hole through the wall and insert
the sensor cable.
-Fix the sensor cover to the wall using supplied
screw.
-With an electric cable (100ft max.) having 2
conductors 20ga. connect one end of this cable
to the sensor cable using twist-on wire
connectors and the other end to terminals S1 &
S1 of the boiler.
If you wish to operate the boiler at a fixed target
temperature, simply do not connect the sensor
before applying the power to the unit (do not put
a jumper between S1&S1 if the outdoor sensor is
not used).
3.7.4 Room thermostat wiring
3.7.4.1 Single heating zone
Using a two (2) wires central thermostat, connect
the low-voltage thermostat dry contact to the W
and R terminals on the ECO ULTRA electrical
panel.
Using a three (3) wires central thermostat,
connect the C, W and R terminals to the boiler
electric panel corresponding terminals.

ECO ULTRA Electric Boiler Installation, Use and Care Manual (Revision June 2017), Page 14.
DO NOT apply external current to these
terminals.
3.7.4.2 Zone valve zoning
Connect the low-voltage thermostat to the zone
valve motor. The components must wired such
that, upon a heating demand from a thermostat,
only the corresponding zone valve will be
actuated and will in turn activate the ECO
ULTRA. Connect the zone valve dry end switch
contact to the W and Rboiler electrical panel
terminals
The 24 Vac power supply transformer used
must be powerful enough to supply
simultaneously all zone valves.
3.7.5 Automatic transfer mode wiring
If needed, The ECO ULTRA boiler is designed to
automatically transfer the right energy source to
be in function. The automatic transfer mode is not
set by default. This mode allows to activate the
electric elements upon reception of an external
signal. The ECO ULTRA will select the
appropriate energy source and will activate the
renewable energy source or the electic boiler. If
the heating distribution system is equipped with a
single pump connected to the PP terminals of the
boiler, it will be activated on heat calls from the
thermostat, whichever the energy source
selected.
To allow the operation in automatic transfer
mode:
Open the front access panel to the boiler
electric compartment. Remove the screw at
the bottom of the controller; raise the upper
section of the controller. You will see a
switch at the back of the controller having
two positions “ELECT” and “Bi-Energ”.
Position the switch at “Bi-Energ” (see fig.9)
Install a 2 wire 18ga cable between the
contact (NC contact to allow the operation in
electricity) of the external device making the
selection of the operating mode and
terminals E1E2(see fig.10)
Install a pump relay (such as Honeywell
RA832 or TACO SR501-4) near the
renewable energy source to authorize the
ECO ULTRA control the start up your
renewable energy source. (see fig.10)
- The relay can be supplied by an external
120V source or directly from the boiler fuse
and P2 neutral.
- Install a 2 wire 18 gauge cable between the
“AUX” of the ECO ULTRA and “TT” of the
relay RA832 (or R and W of relay TACO
501-4)
- Connect the auxiliary pump wires on the
relay terminals.
- Connect the electric terminal of the
renewable energy on the “XX” relay RA832
terminals or 6-5 of the relay TACO 501-4
(see fig.10)
- The renewable energy source must be be
controlled by its own operation and limiting
controller.
Do not connect the main electrical supply
of the renewable energy source to AUX
terminals.
Figure 9: Back of the Controller
ECO ULTRA

ECO ULTRA Electric Boiler Installation, Use and Care Manual (Revision June 2017), Page 15.
Figure 10: Wiring diagram with auxiliary energy source
It is also possible to allow the renewable energy
source to be operated according to its own
controls at all times (do not use the ECO ULTRA
contact of the "AUX" terminals) and when the
main renewable energy source is not sufficient to
the request, (closed contact between E1 & E2)
the heating elements will be activated according
to the operating parameters of the controller.
External signal

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3.8 WIRING DIAGRAMS

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Section 4 : ADJUSTMENT OF THE CONTROLLER
4.1 INTRODUCTION
The ECO 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:
Fixed boiler temperature set point (the
outdoor sensor shall not be installed)
Or
Outdoor reset
4.2 DISPLAYED INFORMATION
The electronic control uses an LCD display to
make all adjustments and to visualize the
operation of the system.
Figure 11 : UltraSmart Controller Display

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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 12 : 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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The following tables show the values of the target
temperature that will be obtained in relation to the
outdoor temperature.
80F
27C 70F 21C 60F 15C 50F 10C 10F -12C
40F
4C 30F 0C 20F -7C 0F -17C -10F -23C -20F -29C
110F/43C
120F/49C
130F/54C
Température ext. / Outdoor temperature
Temp. de consigne / Target temp.
STD
MAX
MIN
PLINTHES CHAUFFANTES À AILLETTES
FINNED-TUBE HOT WATER BASEBOARDS
140F/60C
150F/65C
160F/71C
170F/77C
180F/82C
190F/88C
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.
STD
MAX
MIN
PLANCHER CHAUFFANT DANS BÉTON
RADIANT FLOOR IN CONCRETE
80F
27C 70F 21C 60F 15C 50F 10C 10F -12C
40F
4C 30F 0C 20F -7C 0F -17C -10F -23C -20F -29C
100F/-38C
90F/32C
110F/43C
120F/49C
130F/54C
Température ext. / Outdoor temperature
Temp. de consigne / Target temp.
STD
MAX
MIN
PLANCHER CHAUFFANT ENTRE SOLIVES
RADIANT FLOOR BETWEEN JOISTS
140F/60C
80F/27C
80F
27C 70F 21C 60F 15C 50F 10C 10F -12C
40F
4C 30F 0C 20F -7C 0F -17C -10F -23C -20F -29C
100F/-38C
90F/32C
110F/43C
120F/49C
130F/54C
Température ext. / Outdoor temperature
Temp. de consigne / Target temp.
STD
MAX
MIN
RADIATEURS EN FONTE
CAST IRON RADIATORS
140F/60C
150F/65C
160F/71C
170F/77C
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 (0°F (-17°C) à 105°F (40°C). 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 or air-water
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 automatic transfer mode
or autonomous electric mode. The selection is made by
selecting the position “Elect.” for the autonomous electric
mode Or “Bi-Energ” for the automatic transfer mode 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 the autonomous electric
mode “Elect.”