Electro Industries EZB-Eco EZB-T1-05-240-1 Manual

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ELECTRO-BOILER
EZB-Eco®
INSTALLATION & OPERATING INSTRUCTIONS
Model: EZB-T1-05-240-1
EZB-T1-07-240-1
EZB-T1-10-240-1
EZB-T1-12-240-1
EZB-T1-15-240-1
EZB-T1-17-240-1
EZB-T1-20-240-1
APPLICATION:
The EZB-Eco is a packaged system complete with boiler vessel, expansion tank,
air eliminator and circulating pump. It is designed to be used in a variety of
radiant hydronic heating applications. These include radiant floor, baseboard or
radiator heating. These applications can be single or multiple zones. If any single
zone provides less than the minimum required GPM of the boiler, an Electro
Industries’ zone controller option is highly recommended.
This series is equipped for load management interrupt with backup boiler output.
ACCESSORIES: Electro Zone Controller models EB-ZEA-1 and EB-ZES8
Electro Dual Fuel Control Module EB-S-SB
IMPORTANT: The included expansion tank is shipped loose within the EZB-Eco enclosure. The
expansion tank must be installed prior to filling the system. See Mechanical
Installation section.
Note: This product meets the requirements of the ASME Boiler and Pressure Vessel Code.
Conforms to: UL STD.UL834
Certified to: CSA STD.C22.2#165
DO NOT DESTROY THIS MANUAL. PLEASE READ CAREFULLY AND KEEP IN A SAFE
PLACE FOR FUTURE REFERENCE BY A SERVICE TECHNICIAN.

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TABLE OF CONTENTS
Description Page
Introduction 1
System or Water Flow 1
Multiple Zones & Radiant Temperatures 2
Zone Valves/Circulators 2
Room Thermostat Placement 2
Two-Temperature Operation or Feature 3
Boiler/Piping Placement 3
Installation Requirements 4
Clearances 5
Mechanical Installation – Under-Floor Radiation 6
Electrical Hookup 8
Water Fill Procedure 9
Controller Setup 10
Staging/Modulating Jumper 11
Operational Tips 11
Standby Switchover, SOT Timer 12
Replacement Parts List 13
Troubleshooting/Repair Helps 14
Operational Information 15
Drawings:
Basic Mechanical Piping BX603
Low Voltage Hookup UAW429
High Voltage Hookup BH601
Internal Wiring Schematic UAW428
Boiler Accessories BL001
Warranty XX017

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INTRODUCTION
The EZB-Eco has been designed to be the complete system package for radiant heat applications.
When properly sized, the EZB-Eco will provide the needed hot water to properly heat a space in a single
zone or multiple zone application. With its unique WarmFlo technology, the EZB-Eco can easily
modulate output based on the level of demand from a single or multi-zone system. Proper design of the
radiant system is required to assure minimum required water flow (GPM) through the boiler.
BOILER CONTROL
The EZB-Eco can be operated with a single thermostat or multiple thermostats connected to the R-W
terminal. It can also be controlled through an Electro zone control board or other brand zone controller.
Do not jumper the R-W terminals for hot boiler application. This can cause unpredictable results and
possible high limit lockout of the boiler elements resulting in no heat output.
The EZB-Eco can be used in dual heat/dual fuel applications. Existing components should be evaluated
for removal as the EZB-Eco contains components that can be used by both systems. If you are
considering adding an electric boiler to relatively new existing gas boiler system, contact the factory for
additional information.
NOTE: This model series is designed and equipped for 240-volt residential, single phase. If this unit is
used on 208-volt, energy capacity is reduced by approximately 25%. The installed transformer has a
primary tap for 208-volt. Rewire the internal transformer so the boiler is using this primary tap for 208-
volt applications.
APPROVED TUBING/PIPING
When plumbing this boiler and its peripheral parts to the loop system, all plumbing parts and/or tubing
must be sealed to prevent entrance of oxygen.
Use only tubing or polyethylene tubing with oxygen Diffusion Barrier.
SYSTEM OR WATER FLOW
In order to prevent hi-limiting and assure full 20+ years parts life, the piping system/basic
plumbing/circulator pump must be arranged to provide flow greater than minimum GPM shown in Table
1 below. If zoned system, this applies when the smallest zone is operating.
TABLE 1 - ELECTRO-BOILER SPECIFICATION
Model Volts Phase Watts Btu/h Amps CB
GPM
MIN
EZB-T1-05-240-1 240/208 1-60 Hz 5,000/3,500 17,060/12,795 21.8A/18A 30A 1.0
EZB-T1-07-240-1 240/208 1-60 Hz 7,000/5,300 23,885/17,913 29A/25A 45A 1.0
EZB-T1-10-240-1 240/208 1-60 Hz 10,000/7,500 34,121/25,591 42A/36A 60A, 2.0
EZB-T1-12-240-1 240/208 1-60 Hz 11,500/8,600 39,239/29,429 48A/41.5A 60A, 2.0
EZB-T1-15-240-1 240/208 1-60 Hz 15,000/11,300 51,182/38,386 62.6A/54A 30A +60A, 2.0
EZB-T1-17-240-1 240/208 1-60 Hz 17,500/13,100 59,712/44784 73A/63A 45A+60A 2.0
EZB-T1-20-240-1 240/208 1-60 Hz 20,000/15,000 68,242/51,182 83A/72A 60A+60A 2.0
Circulating Pump, all boiler models 120V 60 Hz 0.54 Amps 10A CB

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MULTIPLE ZONES AND RADIANT TEMPERATURES
Same water temperature all zones – in this case the system can be setup as one pump with the water
circulated through the boiler and directly to a manifold containing the various zone valves. Although this
model series has a built-in outlet sensing and controller mechanism for staging the elements, also consider
the next section, Zone Controller. If not using zone controller, the end switches of all of the zone valves
are paralleled and directly control R and W to turn on the boiler.
Electro Industries’ Zone Controllers – the Electro Industries’ zone controller priority zone has the
ability to communicate with this EZB-Eco Series boiler and it will automatically switch to a high water
temperature (150° F or 180° F) during zone 1, priority switch on, operation. With this feature the EZB-
Eco boiler can automatically take care of two temperature requirements thus eliminating the need for the
technique described in the paragraph above.
ZONE CONTROLLER
This EZB-Eco Series boiler controls the electric elements based upon water temperature independent of
flow; therefore, in theory, a staging zone controller is not required; however, there are three suggestions
or reasons why a zone controller can simplify the installation and enhance overall performance.
1. Zone wiring and troubleshooting convenience – the addition of the zone board allows for easy
terminal block and point to point wiring for each zone thermostat and each zone valve. Also there
are LED’s associated with the thermostat action and the zone valve action. This greatly simplifies
wiring and future troubleshooting with a neat terminal block wiring arrangement and the onboard
LED’s.
2. Prevents over control or false staging up and down when the temperature sensors are
attempting to regulate – since Electro Industries’ zone controllers have staging smarts, the addition
of the zone controller will provide smoother boiler temperature control. The zone board has a dial
switch for each zone and the installer selects one of four zone capacity sizes. When dialing in the
size closest to the zone Btu/h capacity, the zone controller smarts only allows the appropriate boiler
stage which can handle that capacity. Also this is additive if more than one zone calls at any one
time.
3. Two temperature system with unbalanced zones – if the application includes zone one requiring
high temperature (fin tube, air handler, etc.) and the remaining zones are radiant floor low
temperature, this zone controller will automatically raise the output of the high temperature zone.
This is a priority arrangement, zone 1 holds off the other zones while the high temperature output is
heating. If at the end of the high temperature zone there is a call on any of the low temperature
zones (up to three plus slave 4), there will be a pump only function until the outlet temperature drops
below the front panel dial setting.
ZONE VALVES/CIRCULATORS
It is recommended to use zone valves in multi-zone applications with the EZB-Eco boiler.
ROOM THERMOSTAT PLACEMENT
Fin tube radiation, fan coil, etc. – heat only wall thermostat, connected to operate zone valves (see
previous section) or for single zone the thermostat is connected directly to EZB-Eco R and W.
Floor radiant – comfort and proper space heating response is a direct relationship to the thermostat type
and the placement of the thermostat sensing bulb. Typically an under floor heating system can be broken
down into three categories.
A. Energy storage, water tubing is under the concrete or within the sand base – the controlling
thermostat must have a remote bulb, and this remote bulb must sense the concrete slab temperature
(slab stat). Coordinated with the concrete pour, install a ¾” PVC, minimum bend radius of 7
inches, and locate at approximately center (vertical) of the concrete slab. The thermostat sensing

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bulb can later be pushed down this PVC conduit. If the slab is already poured without conduit for
slab stat, use electronic remote sensing thermostat.
B. Floor covering, medium to high insulation – use slab stat as described in paragraph A above.
C. Quick response, hydronic tubing just under the concrete surface, no flooring material over the
concrete – in this case, heated water can directly radiate into the room, a standard wall mount room
thermostat is adequate. Mount room thermostat on an inside wall similar to most heating systems.
TWO-TEMPERATURE OPERATION OR FEATURE
When using Electro’s zone controller in priority mode, the boiler system can
automatically raise the outlet temperature with zone 1 calling. This is setup
for default of 150° F or pulling a jumper peg the high temperature value is
176° F. See appropriate zone controller installation manual for details.
Outdoor Reset Option
The EZB-Eco boiler comes equipped with an outdoor sensor (shipped loose). This sensor can be
connected to the board to allow for outdoor reset function.
What is Outdoor Reset?
Outdoor reset is where the Electro Boiler DT (desired water temperature) shifts up and down based on the
outdoor temperature. The water temperature coming out of the boiler will be higher when it’s cold outside
and lower when it’s warmer outside. The idea is to have the boiler work with the building heat loss to
maintain a more even BTU delivery to the space. This helps with overall system efficiency as well.
Outdoor Reset Activation
If it is determined that outdoor reset is required for this application, it needs to be activated.
Follow this sequence to activate outdoor reset:
Step 1: Power down the Electro-Boiler
Step 2: Connect the outdoor sensor
Red wire to RED
Black wire to OT
White wire to COM
Step 3: Power up the Electro-Boiler
See: CONTROLLER SETUP for more information on outdoor reset.
BOILER/PIPING PLACEMENT
This model series is wall hung and the vessel must be vertical, drawing BX603.
Additional plumbing items are located below the boiler housing itself as shown on drawing BX603.
For future servicing, the unit itself must be installed 18” or more above the floor, the elements are
screwed in from the bottom.
INFORMATION/WATER FLOW CALCULATIONS
Water flow, GPM, can easily be calculated if the temperature rise across the electric boiler can be
measured.
The formula below can only be used when the temperature rise is stable and the boiler is not hi-limiting.
In other words, verify constant current draw and stable outlet temperatures for at least 15 minutes.
GPM = Volts x Amps x 3.4
500 x Temp. rise

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INSTALLATION REQUIREMENTS
1. All installation work should be performed by trained, qualified contractors or technicians. Anyone
installing this boiler should carefully study this manual prior to installation to get familiar with and
plan how the boiler will be installed.
WARNING
ALL ELECTRICAL WIRING MUST BE IN ACCORDANCE WITH NATIONAL ELECTRIC CODE
AND LOCAL ELECTRIC CODES, ORDINANCES, AND REGULATIONS.
WARNING
OBSERVE ELECTRIC POLARITY AND WIRING COLORS. FAILURE TO OBSERVE COULD
CAUSE ELECTRIC SHOCK AND/OR DAMAGE TO THE EQUIPMENT.
CAUTION
This unit can only be used for its intended design as described in this manual. Any internal
wiring changes, modifications to the circuit board, modifications or bypass of any controls, or
installation practices not according to the details of this manual will void the product warranty,
the ETL/Intertek certification, and manufacturer product liability. Electro Industries, Inc.,
cannot be held responsible for field modifications, incorrect installations, and conditions which
may bypass or compromise the built-in safety features and controls.
2. This installation manual and Electro-Boiler products relate only to the addition of the Electro-Boiler to
the hydronic system. The owner/ installer assumes all responsibility and/or liability associated with any
needed installation of the gas/oil boiler, pump, plumbing, system design, hydronic systems or backup
gas/oil boiler, etc. Any instructions or comments made within this manual (or factory phone assistance)
relating to the gas/oil furnace are provided as comments of assistance and helps only.
CAUTION
Hazards or unsafe practices could result in property damage, product damage, severe personal
injury and/or death.
3. Remember, safety is the installer’s responsibility and the installer must know this product well
enough to instruct the end user on its safe use.
Safety is a matter of common sense - - a matter of thinking before acting. Professional installers have
training and experienced practices for handling electrical, sheet metal, and material handling
processes. Use them.

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CLEARANCES
MINIMUM CLEARANCE SUGGESTED MINIMUM
SERVICE CLEARANCE
LEFT SIDE 1 INCH 26 MM 12 INCHES 305 MM
RIGHT SIDE 1 INCH 26 MM 12 INCHES 305 MM
BACK REQUIRED CLEARANCE – 0 INCHES/0 MM
FRONT REQUIRED CLEARANCE – 6 INCHES/153 MM
TOP REQUIRED CLEARANCE – 14 INCHES/356 MM
BOTTOM REQUIRED CLEARANCE – 14 INCHES/356 MM
SURROUNDING AMBIENT TEMPERATURE MUST NOT EXCEED 90° F/32° C.
CAUTION
For all installations, whether in a room or enclosed space, adequate ventilation must be
provided so this boiler’s surrounding ambient temperature does not exceed 90° F/32° C.
WARNING
FOR SAFETY REASONS ALL COMBUSTIBLE AND NON-COMBUSTIBLE MATERIALS MUST
BE KEPT AT LEAST ONE INCH AWAY FROM ANY SURFACE OF THIS BOILER.
CAUTION
This electric boiler is ONLY designed for indoor installation. It is NOT designed for outdoor
installation.

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MECHANICAL INSTALLATION – UNDER-FLOOR RADIATION
CAUTION
Electro Industries Inc. requires the use of dielectric isolation between the boiler supply and
return piping when the boiler is plumbed using copper or any other dissimilar metal. Damage
to the vessel caused by galvanic corrosion voids Electro Industries’ warranty.
Reference drawing BX603
1. Unpack the EZB-Eco boiler. Shipped loose from the boiler are outdoor sensor, pump check valve and
mounting assist bracket.
2. The mounting assist bracket is used to hold the boiler in place during installation. Locate where the
bottom of the boiler will be on the wall. Securely fasten the mounting assist bracket to the wall with
the bent flange sticking out. This will allow you to “rest” the boiler between the flange and the wall
while the boiler is secured to the wall installing mounting bolts through side and top boiler flanges.
Do not remove the mounting assist bracket until you have securely bolted the boiler to the wall. The
unit must be positioned with the vessel vertical. The unit will not function properly with the vessel
in a horizontal position. NOTE: Mount at least 18 inches above the floor to allow element removal
and service at the bottom.
3. Expansion tank installation – the expansion tank is included but shipped loose within the EZB-Eco,
and must be installed prior to filling the boiler and system with fluid.
CAUTION
Use proper tools to install expansion tank. Attempting to tighten by hand will result
in damage to the expansion tank.
a. Remove and unpack the expansion tank from within the EZB-Eco enclosure.
b. To prevent water leaks, apply Teflon tape or suitable thread sealant (not included) to the
threaded nipple of the expansion tank.
c. Thread the expansion tank into the designated shutoff fitting located at the bottom of the
air eliminator assembly. Use a 7/8” wrench to tighten the expansion tank at the
designated fitting on the expansion tank. DO NOT ATTEMPT TO TIGHTEN BY
HAND.
d. Open the shutoff valve between the expansion tank and air eliminator assembly. Failure
to open the valve will create problems when pressurizing the system during fill
procedures.
4. The key mechanical components included with the EZB-Eco are:
Expansion Tank – provides constant system pressure. The expansion tank is pre-charged to
12psi.
Air Vent/Inline Air Separator – provides a means to trap and remove air from the hydronic
system. Loosen small cap on top of air eliminator to allow air to purge. Tighten cap to finger
tight only after system has been sufficiently purged of all air. This can take several days.
Pressure Safety Valve – 30psi pressure relief valve will release water when system pressure
exceeds 30psi. During purging there is a requirement to bleed out the initial air within this 1”
pipe leg by manually holding open the relief valve. Add the necessary pipe extension to the
relief valve to prevent water damage on this unit or surrounding area.
Circulating Pump – the included pump provides water flow throughout the hydronic system.
This is a 3-speed pump, shipped from the factory set to high speed. The pump speed may be
adjusted as needed for ideal system temperature rise. Electro recommends allowing your
hydronic system to warm to desired temperature before adjusting pump speed. A pump check
valve is shipped loose with the EZB-Eco. For single pump systems it is not required. If the
EZB-Eco is piped in conjunction with a fossil fuel boiler with internal pump, the check valve
may need to be installed. Contact the factory for more information.

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5. Piping between the EZB-Eco and hydronic system manifolds is shown on drawing BX603. When
following this diagram, the water fill procedure becomes very simple and almost guarantees the
removal of all air or prevents air locking problems. Experienced hydronic heating installers may be
able to eliminate some components but the inclusion of these components guarantees installation and
initial operating success. Material used for piping between the EZB-Eco and the manifolds may
include copper, black iron or oxygen barrier PEX tubing rated for hydronic heating.
6. When connecting pipe of dissimilar metal to the inlet and outlet of the boiler, dielectric unions must
be used.
7. To ensure safe boiler operation, adequate system pressure must be maintained. Once all the air is
purged form the system, adding additional water may be required to bring the system up to operating
pressure, 12psi.
8. Depending upon water conditions, determine whether water additives are necessary.
9. Purge and fill water system. Do not allow the electric element to come on until the system is purged
and you have verified proper water circulation. If the pump is needed, jumper the two orange wires
in order to operate the pump directly from its own 120-volt source.
10. Purge each loop individually, one at a time.
11. Check for leaks.

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ELECTRICAL HOOKUP
Reference drawing BH601
1. 240/208-Volt Heating Power – route and install the proper current carrying conductors from service
panel fuse or circuit breaker. See Specification Table and/or product nameplate for ratings. These
models contain built-in circuit breakers and meet the requirement for local disconnect for appliances
greater than 10 kW. Connection is at the circuit breaker terminals. If using single feed method,
single feed bus – order part number 5701.
Only copper wire is allowed.
Circuit Breaker 1 is highest priority stage.
2. Grounding – copper conductor is required, size per NEC code relating to the current of each feed.
3. 120-Volt Circulating Pump Power – route and install the proper current carrying conductors from
service panel fuse or circuit breaker, 10-amp maximum. These models contain a built-in 10A circuit
breaker. Wire connection is at the circuit breaker and neutral/ground terminals.
Only copper wire is allowed.
4. Operating Thermostat – two types can be used. Connection is at the control board bottom.
Standard Mechanical – connect to R and W, bottom right. Set thermostat internal heat
anticipator to 0.2.
Floor Sensing Stat – connect to R and W, bottom right. Place slab sensor in the slab.
If needed, can connect thermostat C to boiler C.
NOTE: Power robbing/power stealing thermostat – if you have a power robbing or power stealing
thermostat, you must use the resistor included with the thermostat. Place this jumper between boiler
W and boiler C. If resistor is not used, intermittent boiler operation can be expected.
5. Load Management Interrupt Control (LMC) – this Electro-Boiler series has been pre-wired and
designed for an external utility load management receiver connection. The control board lower left
terminal block marked BLU and BLU/WHT represent the two contact points, extend these wires to
the utility load control device. As shipped, this unit is only equipped for off-peak = N.C. logic. If
reversed logic is required, contact the factory for modification.
Optional – if load management is not used, simply keep the blue jumper in place.
Optional – if the power company disconnects 240V for load control, contact factory for
drawing BH029 for special wiring requirements.
6. Outdoor Sensor – the loose OT sensor needs to sense true outdoor temperature. Mount on an
outside wall position that will represent the most accurate outdoor temperature. If possible shade
from direct sun rays. Maintain a distance of 3 feet from dryer or other exhaust vents. Sensor length is
25 feet. The sensor can be extended up to 50 feet by splicing on a 3 conductor wire. Secure wire
connections should be made to prevent inaccurate or false sensor readings to the control board.
7. Zone Valves or Zone Pumps – see Zone Controller section for options.
WARNING
THE END SWITCHES FROM THE ZONE VALVES MUST BE AN ISOLATED CONTACT WITH NO VOLTAGE
PRESENT ON THESE WIRES OR SCREW TERMINALS. THIS IS VERY IMPORTANT TO MAKE SURE THERE
ISN’T ANY INTERFERENCE OR FEEDBACK BETWEEN THE TRANSFORMER OPERATING THE ZONE VALVE
SYSTEM AND THE TRANSFORMER WITHIN THIS ELECTRO-BOILER PRODUCT. ONCE THIS HAS BEEN
DETERMINED, ALL END SWITCHES ARE SIMPLY PARALLELED WITH THE TWO WIRES GOING TO R AND W.
8. Low Water Cutoff – a low water cutoff is not included or factory required for the boiler. However,
one can be added to the LMC circuit. Simply place the field provided flow switch in series with this
circuit.
NOTE: The L/W (J3) jumper must be in the W position.

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9. Flow Switch– a flow switch is not included or factory required for the boiler. However, one can be
added to the LMC circuit. Simply place the field provided flow switch in series with this circuit.
NOTE: The L/W (J3) jumper must be in the W position.
WATER ADDITIVES/TREATMENT
Water treatment is strongly suggested to prevent scale deposits, corrosion from acids, oxygen, and other
harmful elements within the specific water supply. It is the installer or user’s responsibility to verify water
quality and maintain acceptable water quality throughout the life of this product.
As a minimum the following water properties must be considered:
Hardness (ppm): 0-10
pH: 7.5-10
Iron Content (ppm): 0-20
Oxygen Content (ppm): 0
Total Dissolved Solids: 0-5000
Up to a 50/50 propylene glycol mixture is acceptable for use in these boilers
WATER FILL PROCEDURE
The following procedure applies to non-glycol or antifreeze and prepackaged plumbing kit and/or when
the system is plumbed exactly as shown on drawing BX603.
CAUTION
If the building supply pressure is connected directly to supply water ball valve without pressure
reducing regulator, user needs to make sure the pressure within the boiler loop does not exceed 30
PSI. Careful control of the supply water ball valve opening can take care of this. Also at steps 6
and 10, use caution to make sure the building water supply pressure does not spike the system.
1. Do not apply 240/208-volt heating power during water fill sequence.
2. Connect the temporary household water supply source (probably hose connection) to the water
supply connection input.
NOTE: If water supply connection is permanent, some local building codes may require
special anti-siphon check valve, RPZ check valve, or equivalent between the boiler fill
regulator and the domestic water source or the city water connection.
3. Connect a drain hose to hose bib, drain valve.
4. Open drain valve and close ball valve (between drain valve and boiler). This will ensure water
flushes in one direction through the system.
5. Verify any hydronic manifold valves are open.
6. Open water supply valve and open household water supply source.
7. Allow water to circulate, discharging through drain valve, for at least 15 minutes.
8. Close both the inlet and drain valves.
9. Slowly open the inlet valve unit the cold system pressure at the gauge reads 12 to 20 PSI, then
close the valve.
10. Loosen the air bleed cap on top of the air eliminator.
11. Optional – to purge any remaining air in the system, energize the circulating pump by inserting a
jumper across the R-W terminals on the boiler control board. Temporarily removing the blue
jumper at the blue-blu/wht terminal will prevent elements from activating during this process.
Run pump for 30 minutes. If a significant amount of air is removed and the boiler pressure drops
below 10 PSI, slowly open the water inlet valve to build water pressure to 12 to 20 PSI.
12. Once the boiler pressure is stable, disconnect the water supply.
COMMENT: Purge one loop at a time.

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CONTROLLER SETUP
Front Dial
Non-Outdoor Reset – simply set the knob to the desired outlet temperature on the front panel decal.
This control strategy is accomplished via disconnecting the outdoor sensor and performing a power
reset to the boiler (low voltage power cycle).
Outdoor Reset – the temperature decal will relate to the OT 0° F set point and the knob numbers
coincide with the curves below. High and low mass also relate to the ramp-up water temperature
starting point, as shown. Select the high or low mass with the rate of temperature rise based on
outdoor temp (OT).
Comment: The WF-ANZ* test set allows field change of the base temperature start point.
This control strategy is accomplished via connecting the outdoor sensor and performing a power reset
to the boiler (low voltage power cycle).
The front panel temperature selection number coincides to the curves below. This temperature value
shown on the front decal is actually the supply water at 0° F outside.

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Staging/Modulating Jumper
The control board on the EZB-Eco boiler is a universal controller with the capability of interfacing with
many different models of TS Electro-Boilers.
The correct setting of this jumper is determined on the model of the boiler you are
working with.
For the EZB-Eco this should be set to MODULATE.
Circulator pump mode – as factory set, the circulator pump is controlled directly from the W input
terminal. In this setup the circulator pump continues during load control interrupt (or optional remote
standby switch). There is a provision within the controller board (inside) to allow the circulator pump to
not operate during load control interrupt.
On the inside control board, just above the two
bottom terminal blocks, is a small pin jumper
arrangement. The black jumper sets up the pump
mode. Just below this pin jumper arrangement are L
and W lettering. When the two pin shorting device
is in the W position, the pump is a direct function of
R to W input. When the two pin jumper is in the L
position, the pump is interrupted during a load
control.
WARNING
THIS SHORTING DEVICE MUST BE IN ONE OF THE TWO POSITIONS FOR THE CIRCULATOR
PUMP TO PROPERLY OPERATE.
OPERATIONAL TIPS
Front Panel Monitor Lights
190°F AUTO RESET LIMIT, red – this will only
illuminate when the vessel hi-limit opens due to
excessive high water temperature. This hi-limit is self-
resetting.
BOILER POWER, green – basically this is illuminated
at all times. It represents 24-volt power source, good
fuse, controller logic is operational, and a good outlet
sensor. If the outlet sensor is inoperative, incorrectly
wired, or malfunctioning; this green monitor LED
should be pulsing (see Troubleshooting section).
ELECTRIC MODE, yellow – when illuminated the
system is in the electric mode. If it is not illuminated the
utility load control receiver is in the interrupt or on-peak
mode. If there is an optional or remote standby switch,
the status of the standby switch is also monitored by this
yellow LED.
THERMOSTAT CALL, red – indicates a remote
switch closure (thermostat or zoning end switch) is
closed between terminals R and W.
Inside Control Board Monitor Lights
STAGES, red – these four LED’s indicate which electric element stages are on and active.

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Manual Reset Hi-Limit
At the top of the vessel there will be either two or three surface mount hi-limits preset at 205° F. There is
no light indicator associated with these safety hi-limits. Also these 205° F safety limits break the L2
current carrying 240/208-volt wire going to the elements. Reset involves locating a small shiny lever or
metal tab protruding on the side of the black safety limit base. This small tab is pressed inward
approximately 1/8” to snap in the contacts.
CAUTION
The wires and screws have 240/208-volt potential and can be dangerous. Turn off circuit
breakers before investigating or attempting to reset the 205° F safety limits.
Internal Fuse
The fuse on the controller board protects the transformer secondary, external items connected to R, and
the circuit board itself. Replace with 2-amp, fast blow fuse or equivalent.
System Pressure
The side press/temperature gauge should be at approximately 10 to 14 PSI at room temperature water and
should not rise more than approximately 4 PSI at the operating or hot water temperature. If the pressure
change is more than approximately 4 PSI, the expansion tank is too small or there is a problem with the
expansion tank piping, expansion tank itself.
Cold slab, outdoor reset and temperature sensing prevent full boiler on – by adding a temporary
jumper between the lower W screw terminal and the upper left E tab, all temperature sensing functions
are bypassed and the control board will step in all the stages.
CAUTION
This jumper shall not be a permanent function, jumper needs to be removed after slab is
approaching normal temperature.
Standby Switchover, SOT Timer
This plug-in option device allows a selection from 40 to 80 minute thermostat operating time for
automatic switchover to standby boiler. Order part number SOT-1.
WARNING – HIGH VOLTAGE
MUST SHUT OFF HIGH VOLTAGE BEFORE
ATTEMPTING TO RESET.

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Replacement Parts
WFS2 Water sensor (ST), 5 ft.
WFS25F Outdoor sensor (OT), 25 ft.
EB5623 Control board
UFUSE0443 2-amp, fast blow fuse
4038KIT Triac switch module
5128C Heating relay
5535 Safety hi-limit, manual reset, 205° F
5537G Safety hi-limit, auto reset, 190° F
5453 Relief valve, 30 PSIG
5456 Pressure/temperature gauge
5652 60A SQ D circuit breaker
5651 45A SQ D circuit breaker
5650 30A SQ D circuit breaker
5680 10A SQ D circuit breaker
EB5526 Electric element, 240V, 5 kW
EB5520 Electric element, 240V, 4.5 kW
EB5524 Electric element, 240V, 2.5 kW
5541 Transformer, 24V, 40VA
5585T Circulating Pump, 120V
5590 Expansion tank, 2.1 gal.
5596 Air eliminator

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TROUBLESHOOTING/REPAIR HELPS
1. This WarmFlo controller contains several interference suppression components, but as an electronic
logic product, unpredictable and unusual transients or interference may sometimes cause strange
results. If the WarmFlo controller is acting strange, one immediate step would be power down reset.
Simply turn off boiler power or breaker number 1, when the green LED goes out, count to 1Ø, and
re-energize power supply.
2. Inoperative temperature sensor, if the internal program can detect a bad sensor (shorted, open wire,
etc. – not necessarily bad value) the front panel green LED will be pulsing. By checking the pulsing
pattern, the appropriate sensor can be identified.
-OT sensor – 1 blink every second
-ST sensor – 2 blinks every second
-Both bad – 3 blinks every second
The temperature sensor can be further evaluated with diagnostic tool WF-ANZ7 WarmFlo Analyzer.
This Analyzer includes the ability to fool the sensor or set in an offset for various troubleshooting
purposes.
3. The terminal blocks for control wire hook-up are designed for a wire insertion and screw clamp
down. If there is no wire connected and the screw is loose, the screw may not necessarily make a
good electrical contact to the inside components. Example – if you are jumpering the thermostat
terminals without thermostat wire connection or if you are attempting to measure voltage on the
screw head, you may get erroneous or unpredictable results if the screw is not tightened down.
4. The outdoor sensor (OT) must be sensing the actual outside temperature for this controller to
correctly operate (if you’re using the outdoor reset configuration). Do not simply leave the outdoor
sensor hang in the room and attempt to run this system.
5. Temperature sensing bypass – the inside control board, left side, contains a E tab which can be used
to directly step in the heating stages and in essence bypass the temperature sensing and control
functions. The E tab has the highest priority and overrides all temperature sensor functions. In other
words, when jumpering from W to E all four stages are hard on. Note: Verify pump is operating
prior to using the E terminal. Since activating this E terminal causes full electric element output, this
function should only be used to verify all stages or troubleshoot proper 24Ø current at each element.
6. Use general heating system logic information and basic understanding of the terminal block wiring
functions measure various voltage points to determine proper operation.
Sensor Temperature Calibration - Both remote sensors are digital electronic and factory calibrated.
Normally these do not require field calibration or verification. However, if sensor temperature error is
determined, there are two field calibration techniques. Proceed with extreme caution.
1. The outdoor sensor (OT) can be calibrated with ice (32F). This is not a checking temperature
situation. If you proceed with this function, the sensor automatically goes to 32F. Notice a small
push button next to the sensor terminal block, with the sensor at 32F, push and hold for
approximately ten seconds. When the green LED next to the fuse blinks at you, release and now the
outdoor sensor is set at 32F.

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OPERATIONAL INFORMATION
Normal heating operation – when there is a heat call from the thermostat (24VAC present on the control
board W-C terminals) the boiler pump will start and three indicator lights will illuminate on the front of
the EZB-Eco:
Boiler Power, steady green
Electric Mode, steady yellow
Thermostat Call, steady red
After a short delay of one minute or less, the EZB-Eco will begin to stage up elements (as indicated by
the four red staging LED’s on the inside control board) in order to reach the desired supply water
temperature. The desired water temperature is set on the front dial or is determined using the front dial
and the outdoor reset curve when the outdoor sensor is connected.
As the EZB-Eco reaches it set point water temperature you may see the boiler stage lights stage off and
quite often you will see stage 1 LED pulse on and off or modulate. This is normal operation for the built-
in WarmFlo controller as it works to maintain constant water temperature as efficiently as possible.
Note: Some model sizes will not require all four stages to control elements; however, the control board
LED’s may show those unused stages active.
190° auto reset high limit – under normal operating conditions the 190° auto reset LED should not come
on. The built-in WarmFlo control of the EZB-Eco should prevent this. However, on a system with very
low water flow or trapped air you will see the 190° auto reset activate. The water within the boiler vessel
must cool by 30° F before the high limit will self-reset.
If you experience auto reset limit trips at initial startup of the EZB-Eco the following items should be
checked:
System pressure 12 to 20 PSI on boiler gauge
All ball valves and manifold valves are in the “on” position
Boiler and system are purged of any trapped air. Loosen air bleed cap on the top of the air
eliminator.
Boiler water temperature – with a thermostat heat call, the EZB-Eco will try and achieve a temperature set
point. The time it takes to reach set point will vary depending on conditions of the system. When operating at
the recommended flow rate (GPM per kW) you should see an approximate 20° difference between return
water and supply water temperature. On a cold start up with return water temps below 60° F, it could take a
few hours for the boiler to reach a set point above 80° F. Adjusting the set point dial to a higher temperature
during a cold startup will have little or no effect since the boiler cannot exceed a 20° increase in temperature
from return to discharge.
Once the return water temperature starts to increase you will start to see an increase in outlet temperature.
This will continue until the outlet temperature reaches the desired set point, at which point the WarmFlo
control will stage and modulate elements to hold that temperature.

MANIFOLD
1" PIPE
1" X 1" X 3/4" TEE
WATER SUPPLY
BALL VALVE
BALL VALVE
DRAIN VALVE
(THREADED INTO TEE)
1" X 1" X 3/4" TEE
EZB BOILER
1" PIPE
NIPPLE
IN OUT
BX603
REV.A 04/28/20
Electro
Industries, Inc.
Monticello, MN 55362 [phone]
EZB MECHANICAL PIPING SCHEMATIC

UAW429
Rev. A 5/7/20

3
2
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EZB SERIES HOOKUP, INSTALLATION
BH601
Rev. A 05/04/20
EZB-**-**
BH601 A
1 of 105/04/20