Electro Industries EMB-H-5 User manual

09/17/2014 BI308
Electric
Mini-Boiler™
HI TEMP MODEL
Installation & Operating
Instructions
EMB-H-5 240-volt, 1-stage 30A CB 4.5 kW 15,000 Btu/h
EMB-H-7 240-volt, 2-stage 45A CB 7 kW 24,000 Btu/h
EMB-H-9 240-volt, 2-stage 60A CB 9 kW 31,000 Btu/h
Application – This Electro-Boiler is factory equipped with WarmFlo smart controller. WarmFlo
automatically regulates outlet water temperature based upon preset, front panel, temperature selection. This
model does not have an outdoor sensor and is not programmed for outlet temperature ramping (outdoor reset
concept). If your application is “outdoor reset”, you should consider using model EB-MO series.
Primary application is any hydronic water heating system (high or low temperature systems) where reduced
flow or radiation can cause overheat conditions (example, zones). However, if it is a mixture of large and small
zones, the sudden capacity and flow changes may cause some internal timing/over temp conditions.
This series is equipped for load management interrupt and can apply to standard baseboard radiation, dual heat
combinations, under floor radiant, wood boiler supplement, etc.
Accessories – Attached BL001 lists various accessory or option items which are not part of basic Electro-Boiler.
Note: This product meets the requirements of the ASME Boiler and Pressure
Vessel Code.
Drawings: BX305
BH310
UAW411
BL001
XX017

09/17/2014 BI308
TABLE OF CONTENTS
Description Page
System Components 1
System or Water Flow 1
Modulating Staging Control 2
Zone Controller 2
Safety Temperature Control 2
Room Thermostat Placement 2
Water Flow Calculation 2
Installation Requirements 3
Electric Supply 3
Clearances 3
Mechanical Installation 4
Electrical Hookup 5
Water Fill Procedure 6
Operational Tips 8
Troubleshooting Helps 9
Drawings: BX305
BH310
UAW411
BL001
XX017

09/17/2014 1BI308
GENERAL
The basic components for an electric energy heating system typically include:
1. Electric Mini-Boiler itself – covered by this manual.
2. Thermostat hookup control – covered by this manual.
3. Plumbing kit or piping material at the boiler itself – can be ordered as a kit, reference catalog number
EMB-PK.
a. These items are shown on plumbing installation drawing BX305.
4. Circulating pump – typically sized for head pressure and system flow requirement, typical catalog
number EMB-P2.
5. Radiant heat devices/components.
APPROVED TUBING/PIPING
When plumbing this boiler and its peripheral parts to the radiant floor 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 (ie. PEX).
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. If zoned system, this
applies when the smallest zone is operating.
TABLE 1 - ELECTRO-BOILER SPECIFICATION
240 volts, 60 Hz, single phase
Model Btuh Rating Amp Stages Min. GPM for 160° F
and above* Min. GPM for 144° F and below
EMB-H-5 15,000 5 kW 18.7A 1 1 .5
EMB-H-7 24,000 7 kW 29.1A 2 1 .5
EMB-H-9 31,000 9 kW 37.5A 2 1 .5
*Note: If less than 1 GPM is possible in high temp. mode, suggest using primary/secondary piping to increase
flow rate through boiler, or consider installing zone controller EB-5415A (see page 2 for details).
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.
Various water temperature requirements – if this is the case, a primary loop with mixing valve for the
various zone temperature requirements is necessary. Injection pump techniques can also be used. However,
usually injection pump techniques come with a controller which is designed to protect a gas boiler from cool
water return. This is simply not needed and a duplication with the temp. sensing controller within this Electro-
boiler and the injection pump controller will be of no benefit within the operating system. The zone valve/zone
pump control strategy must be wired to provide the boiler “R and W” contact closure and the primary pump is
connected to the boiler pump contacts. This assures the primary pump is active and running whenever the boiler
is turned on via contact closure on “R and W”. At least one zone must be open before turning on the primary
pump/Electro-Boiler. Do not design a system where the Electro-Boiler is supposed to operate as a “hot boiler”
based upon its outlet sensor without the primary pump circulating water, minimum .5 GPM is required.

09/17/2014 2BI308
MODULATING STAGING CONTROL
This model series is factory equipped with a digital supply water sensor and a modulating controller. The
controller regulates the elements to maintain a preset operating temperature. The control board has a front panel
screwdriver adjustment (see Operational Tips section) for setting the operating temperature point.
ZONE CONTROLLER
If there are zones with capacities and flow less than this boiler’s total capacity, consideration should be given
towards installing a zone controller with the ability to cut off one element for small zones. Low cost multi-zone
interlock, EB-5415A, can provide this function. It also has its own 40VA transformer for powering zone valves.
SAFETY TEMPERATURE CONTROL
The hi-limits within this unit are for safety purposes only. The system installation must have a proper
responding slab or air sensing thermostat or zone controlling device to properly turn the boiler on and off. If the
water flow is greater than the nominal GPM specified, this boiler should not reach hi-limit and the hydronics
loop should continue to flow in the normal heating pattern until the operating slab stat is satisfied. If hi-limiting
is experienced prior to satisfying the operating slab stat, there is probably a water flow issue.
In addition to the built-in supply sensing point and electronic operating temperature control point, there is a 190°
automatic reset hi-limit and a 205° F top vessel manual reset hi-limit.
ROOM THERMOSTAT PLACEMENT – RADIANT FLOOR
Comfort and proper space heating response is a direct relationship to the room thermostat type and the
placement of the thermostat sensing bulb. Typically an under floor heating system can be broken down into two
categories.
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 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 such as Electro Industries’ ES-24-BR. This type of device only requires a
5/16” hole drilled in the concrete at some center wall location.
Quick response, hydronics tubing just under the concrete surface, no flooring material over the
concrete – slab stat is still suggested and preferred, but a standard wall mount room thermostat can be
adequate. Mount room thermostat on an inside wall similar to most heating systems.
Comment: If the slab was poured without the conduit, Electro Industries can provide a remote
(wired) sensing slab stat with a remote sensor requiring only a 5/16” hole. If it is at an inside
wall, the 5/16” hole need only be 1” or 2” away from the plate. If it is an outside wall you
should go in about 24”. Simply insert the sensor about 2” and fill with basic silicone to keep
the sensor protected within the hole.
INFORMATION/WATER FLOW CALCULATIONS
Water flow, GPM, can easily be calculated if the temperature rise across the electric boiler can be measured.
The following formula 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 Example: 240 volts x 36 amps x 3.4 = 29376 = 5.8 gpm
500 x Temp. rise 500 x 10 degree rise 5000
INFORMATION/WATER FLOW CALCULATIONS – METRIC
L/min = Volts x Amps x 3.587 Example: 240 volts x 36 amps x 3.587 = 30991.68 = 20.57 L/min
251.04 x Temp. rise ° C 251.04 x 6° C rise 1506.24

09/17/2014 3BI308
INSTALLATION REQUIREMENTS
1. All installation work must be performed by trained, qualified contractors or technicians. Electro Industries,
Inc., sponsors installation and service schools to assist the installer. Visit our web site at electromn.com
for upcoming service schools.
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 CSA/us certification label, 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
hydronics system. The owner/ installer assumes all responsibility and/or liability associated with any
needed installation of the gas/oil boiler, pump, plumbing, system design, hydronics 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.
ELECTRIC SUPPLY
Model Volts Watts Amps CB Phase Btu/h Element
Stg 1 Stg 2
EMB-H-5 240 4,500 18.7 30 1-60 15,000 1 –
EMB-H-7 240 7,000 29.1 45 1-60 24,000 1 1
EMB-H-9 240 9,000 37.5 60 1-60 31,000 1 1
CLEARANCES
MINIMUM CLEARANCE FROM
COMBUSTIBLE SURFACES SUGGESTED MINIMUM SERVICE CLEARANCE
BACK 0 INCH 0 MM 0 INCH 0 MM
LEFT 1 INCH 25 MM 6 INCHES 152 MM
RIGHT 1 INCH 25 MM 6 INCHES 152 MM
FRONT 1 INCH 25 MM 24 INCHES 610 MM
TOP 1 INCH 25 MM 24 INCHES 610 MM
BOTTOM REQUIRED CLEARANCE – 18 INCHES/457 MM

09/17/2014 4BI308
MECHANICAL INSTALLATION
CAUTION
Electro Industries Inc. requires the use of dielectric isolation between the boiler vessel 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 BX305
The plumbing components and piping layout shown on drawing BX305 has been very carefully picked and
should be plumbed as shown. 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 components such as regulated fill valve, check valve, temperature gauge, etc.,
but the inclusion of these components guarantees installation and initial operating success.
The key mechanical components required include:
Boiler/Plumbing Kit Placement – This model series is wall hung and the vessel must be vertical.
The plumbing kit items are located adjacent to the boiler housing itself as shown on
drawing BX305.
For future servicing, the unit itself must be installed a minimum of 18” above the floor. The
elements are screwed in from the bottom.
Allow adequate space for cover removal and maintenance.
Expansion Tank - As a closed loop hydronic heating system, an expansion tank is required.
Temperature/Pressure Gauge - Recommended to observe the operation of the system. Actually a
temperature gauge at the inlet and outlet is desirable.
Pressure Safety Valve - This is required at the hot outlet and is furnished as a loose component
with the boiler unit itself. Failure to install the provided, 30 PSI, pressure relief valve as shown will
void warranty and the CSA product listing.
Add the necessary pipe extension from the relief valve to the floor to prevent water damage on this unit
or surrounding area.
Gate Valve/Drain Valve - These are for servicing and easy fill purposes.
Circulating Pump - Depending upon system lift and system loop resistance (feet of head), the
proper circulating pump is required to guarantee the minimum GPM flow as specified on the cover
sheet.
Comment: Circulator pump can be in the outlet or inlet. However, the circulator pump should “pump
away from” the expansion tank.
Air Vent Relief - Whenever there is a plumbing point higher than any of the components shown or
an adjacent line (any vertical “U” trap), an air vent valve should be provided.
Building Water Supply Connection – Reference drawing BX305, note 4, some local building
codes require sophisticated check valve or anti-syphon check valve when the hydronics heating
system is permanently connected to the domestic water system. The intent of this connection is
temporary and for fill purposes only. The installer has the responsibility of complying with local
building codes.

09/17/2014 5BI308
ELECTRICAL HOOKUP
Reference drawing BH310
WARNING
DISCONNECT ALL ELECTRICAL POWER BEFORE ELECTRICALLY CONNECTING OR
SERVICING THE UNIT. FAILURE TO DISCONNECT THE ELECTRICAL POWER BEFORE
WORKING ON THIS PRODUCT CAN CREATE A HAZARD LEADING TO PERSONAL INJURY
OR DEATH.
1. Panel breaker sizes – based upon the installed unit capacity, cover page shows model
number/amps/kW, service from appropriate size panel breaker based on NEC code.
2. The EMB-H model series includes a factory provided circuit breaker. This qualifies for a local
disconnect at the product or appliance.
3. 240-Volt Power Source – route and install the proper current carrying conductors, suggested by local
codes, from service panel fuse or circuit breaker. Nameplate shows current & KW rating. Use only
copper wire within this unit enclosure or at the circuit breaker connection.
The source is either from the standard service panel or may be part of an off-peak separately metered
panel/CT metered enclosure. Consult with local utility if questions on off-peak installations.
WARNING
USE ONLY COPPER WIRE FOR CONNECTION TO THE CIRCUIT BREAKER TERMINALS
AND INSIDE THIS PRODUCT’S CABINET.
WARNING
TO AVOID THE RISK OF ELECTRIC SHOCK OR DEATH, WIRING TO THE UNIT MUST BE
PROPERLY GROUNDED. FAILURE TO PROPERLY GROUND THE UNIT CAN RESULT IN A
HAZARD LEADING TO PERSONAL INJURY OR DEATH.
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% and there is a possibility of intermittent
relay operation. The installed transformer has a primary tap for 208.
4. Circulating Pump – the orange pigtail wires, at the control board cube relay, represent a switch closure
(see drawing – 10-amp maximum) to operate the circulating pump motor. Voltage for the pump must
come from a separate source. Wiring entrance must be left KO, do not combine with thermostat cable
or other control wiring.
5. Operating Thermostat – zone valve dry contact end switch is an operating contact, direct wired
thermostats include:
Standard Mechanical – connect to control board “R” and “W”. Important! -Set thermostat
internal heat anticipator to 0.2.
Electro-Stat (ES-24-BR) – 3-wire connection required. This is an electronic remote sensing
device, remote sensor can be up to 25 feet, cut and splice as required. Use only stranded wire,
shielded cable not required. The primary advantages include the capability for longer sensor and
the sensor itself is less than 5/16”. This means it can be installed after the slab is complete by
simply drilling a ¼” hole, 1/8” slot, etc. slightly out from an inside wall.
-R to R, W to W, C to C, green to ground
-Use drawing EH308 (with ES product) for hookup, note change in load control connection.
Comment: If using an Electro Industries zone controller or zone valve type devices, the turn-on or
operating thermostat control function will come from the zone controller W OUT.

09/17/2014 6BI308
Power robbing thermostats – power robbing thermostats cannot be used with the EMB-H Mini-
Boiler.
6. Load Management Interrupt Control – this Mini-Boiler product has been pre-wired and designed for
a power company load management receiver connection. This should not be altered in any manner!
A. Remove blue pigtail wires, wire-nut.
B. Extend the blue and blue/white wires to the power company 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 leave the blues wire-nutted as shipped from
manufacturer. Also for Electro-Stat the load control connection is at the Electro-Stat “R” terminal.
Optional – if the power company disconnects 240V for load control, please reference BH029 for
special wiring requirements.
7. Zone Valve – the installer may elect to totally wire in the zone valves where paralleling the end
switches activate the control board R and W. However, if using EB-5415 or other Electro Industries’
zone controller, wiring is substantially easier and the W OUT goes directly to W input (verify there is a
common on all secondary or auxiliary units). The EMB-H Series has a 40VA, 24-volt transformer
which is capable of driving 1 or 2 external zone valves. Again, generally zone controllers have their
own 24-volt transformer making this easier. Suggest adding zone interlock control, EB-5415A.
8. Inspection/final check – Verify all electrical connections are tight (including factory connections),
verify there is proper spacing between all power and electrical wire/terminals, and verify top high limit
manual reset is “in”. During shipping freight vibration there are times when the boiler vessel top
manual reset high limit is “popped out”.
WATER ADDITIVES
1. Unless the source water is unusually poor and/or rust elements, additives are not required. It is
recommended the water source as shown on drawing BX305 comes through the household water softener.
2. Impurities within a closed loop hydronics boiler are considerably less damaging than the typical domestic
water heater. In a closed loop electric boiler, the water impurities “boil out” and the system essentially
reverts to pure water. As a closed system, this “pure water” becomes the operating mode. In the case of
domestic water tank, there is always new water entering with new impurities.
3. However, if additives are required, use the recommendations and source from your local professional
plumber, specializing in hydronics heating systems.
WATER FILL PROCEDURE
The following procedure only applies to the prepackaged plumbing kit and/or when the system is plumbed
exactly as shown on drawing BX305.
1. Do not apply 24Ø volt heating power during water fill sequence.
2. Connect the temporary household water supply source (probably hose connection) to the "supply water
connection" input.
NOTE: If supply water connection is permanent, some local building codes may require special anti-
siphon check valve, PRZ check valve, or equivalent between the Mini Boiler fill regulator and the
domestic water source or the city water connection.
3. Connect a drain hose to lower hose bib, "drain valve".
4. Open "drain valve" and close "inlet gate valve" (between drain valve and boiler bottom inlet).
5. Verify “top gate valve” is open.

09/17/2014 7BI308
6. Open "water supply valve" and open household water supply source.
This may be at normal household pressure (4Ø to 6Ø PSI), the auto-fill value regulator keeps
the hydronics loop at its proper low pressure.
7. Allow system to circulate, discharging through drain valve, for at least 1Ø minutes.
8. Put your ear against the metal pipe and listen for air bubbles. If the water flow is consistent and quiet, the
system is probably purged and water filled.
9. Close the "drain valve". Open the "inlet gate valve".
10. The cold system pressure at the gauge should be approximately 1Ø to 14 PSI.
11. Close "water supply valve" and disconnect water supply.
12. Optional – The circulating pump can be energized during this fill operation by having the 240 power main
source breaker off and simply jumpering the 2 screw terminals for the pump wire connection.
Figure 1

09/17/2014 8BI308
OPERATIONAL TIPS
1. Indicator lights – there is a set of four indicator lights on the front cover. Figure 1 is a reproduction of the
front decal giving definition and information for using these indicator lights.
2. Boiler power LED indicates 24-volt is present on the control board and is continuous on. Off could mean
no 240 power, open manual reset (vessel top), open fuse, or bad transformer. It also indicates supply sensor
condition (solid = good, pulse = faulty).
3. 240-volt element power current flow can only be measured when the external operating thermostat is calling
for heat. There is a 30-second delay before stage 1 turns on, this allows the pump to circulate and sample
temperature. Stage 2 will depend upon the temperature differential at the sensor in the supply pipe, see page
9 sequence (assumes off-peak mode).
4. The operating thermostat heat call can be verified by the red LED marked “Mini-Boiler Heat ON” located
on front cover.
5. Utility off-peak LED is on when the boiler is not being load controlled (blue wires closed).
6. The hi-limit auto reset LED is on when the vessel top hi-limit switch is open.
7. Via a small pin jumper arrangement on the control board, the circulator pump can
be a direct function of the “W” input or interrupted by the load control device (even
though there is a W input). This diagram illustrates this pin jumper arrangement.
This unit is factory setup in the “W” position meaning the pump will always run as
a direct function of “R” to “W” operating thermostat. By simply moving this black
2-position jumper to the “L” the pump will be turned off during load control
interrupt.
8. At outlet temperatures of approximately 160F (53° C), the maximum operating system pressure should be
approximately 18 PSI (124 kPa). If the PSI (or kPa) increase from cold water to operating hot water is more
than approximately 3 to 4 PSI increase (20.6 to 27.5 kPa), the expansion tank is too small, or there is air in
the system.
9. At the top of the vessel is a manual reset, 205° F (96° C), primary hi-limit. This is behind the upper control
board cover, at the top of the vessel. At the end of the two red/blk wires there is a small red stem between
the wire tabs. This is the reset button.
10. Check for water leaks and repair as required.
11. If flow seems to be a concern, determine both inlet and outlet water temperature and apply GPM (L/min)
formula detailed in previous section “Information/Water Flow Calculations”.
AQUASTAT OPERATION
Determine the design or anticipated outlet temperature. If this is a radiant floor system this typically could be
as low as 110°. If it is staple-up or water coil, satisfactory operation may be at 140° to 160°. If this is
baseboard or radiators, start with 170° and during very cold weather this may need to be 180°.
The front temperature set point is selected by a small screwdriver dial switch. Use the following chart:
Switch Position Set Point
0 90
1 102
2 114
3 126
4 138
5 144
6 160
7 180

09/17/2014 9BI308
TROUBLESHOOTING HELPS
Inside monitor – there are two red LED’s on the inside labeled “STG1” and “STG2”. Each LED is an
indication of stages of boiler on/off.
Located near the thermostat connection is a red LED labeled “MANUAL-HL-OK”. This LED represents the
205° manual reset. If on, manual hi-limit is closed. If off, manual hi-limit is open.
Sequence
At heat call, pump turns on (control board top cube relay and orange wires).
Elements remain off for 30 seconds.
If the sensor is detecting supply water temperature approximately 8° less than set point, both stage 1 and
stage 2 turn on (stage 2 may have a 2-minute delay).
As the outlet temperature approaches the set point, element 1 begins to modulate.
At set point element 1 is off or 0%.
At +5° above set point element 2 is off.
At set point element 1 modulates.
At 5° below set point element 1 is at 100% and element 2 turns on.
Mechanical hi-limit, top vessel screw-in, automatic reset – this is at about 190° F, opens the red/white wire
loop. This can be monitored by the “Auto Reset” front indicator light. As the water cools to approximately
150° it should self reset and restart.
Manual reset limits – surfaced mounted to the top of the vessel, opens at 205° F. This opens all 24V control
power thus opening all element power relays. The observed action is the same as a blown fuse, no front panel
boiler power LED.
To reset this device, simply press the red button located on the limit switch.
Comment: The hi-limit auto reset LED and utility off-peak LED are only on during an active heat call
(lower red LED on).
WARMFLO®TEMPERATURE BYPASS TROUBLESHOOTING OR TESTING
Adding a jumper between “W” screw terminal and tab marked “E” bypasses the temperature sensing and
WarmFlo control. In other words, with the jumper installed, a “W” input represents both stages, full on.
Note: Basic 24V power must be present for the E-tab function to work.
AVAILABLE, ELECTRO INDUSTRIES, INSTALL PARTS OR KITS
EMB-BK MINI-BOILER PLUMBING KIT BASIC
EMB-PK MINI-BOILER INSTALL KIT PREFERRED
EMB-P2 PUMP KIT 1/25HP BOILER
ES-24-BR STAT DIG SLAB/ROOM/ROOM 24VAC
WFS2 TEMPERATURE WATER SENSOR
EB-5415A ZONE CONTROLLER
EMBH5636 REPLACEMENT CONTROL BOARD
4038 TRIAC MODULE
5127 ELEMENT RELAY
5541 TRANSFORMER, 24V/40VA
5576 AIR ELIMINATOR 3/4" ROLLAIRTROL
5456A GAUGE PRES/TEMP 75 PSI/320DG F .25"
5453 VALVE RELIEF 30 PSIG .75” NPT MALE
5590 EXPANSION TAN K 40K BTU 20.1 GALLON

BOILER ACCESSORIES
BOILER ACCESSORIES
This will simplify your wiring and make zoning applications much easier. In addition, enhanced communicating
features have the ability to stage the electric boiler based upon the connected zone capacity.
Standard Features
• Utility load control
• Terminal block wiring, visual
wiring layout
• Indicator lights showing zone
operation
• 24-volt, 40VA transformer
120/208/240 connection
• Fuse protection
• Priority option
• Dual temperature operation
• Applies to digital or
standard thermostats
• Dial switch, select each zone
capacity
Pumps, Actuators, Valves
EB-ZTA-1 - install within boiler cabinet
EB-ZEA-1 - with enclosure and 40VA transformer
EB-ZEA-2 - add additional 4, enclosure and 40VA
Pumps
EB-Z2P - two pumps with priority and dual temp.
Zone Valves
EB-ZTS-1 - install within boiler cabinet, encl. option
EB-ZTS-2 - add additional 4, enclosure and 40VA
All Others
EB-ZXA-1 - universal, pumps or valves, non-communicating, for any boiler
EB-ZS-4 - automatic staging system for Brand X boilers or dual EB-R, -L, -E Series
EB-ZC-4 - wiring and convenience interface, isolated boiler end switch
EB-5415A - low cost, 2 or 3 zones, sheds one boiler stage (Mini-Boiler enhancement)
ZONE CONTROLLER
SLAB STAT
Sensing and controlling the system based upon radiant floor surface temperature
or the concrete mass has very positive benefits. Radiant floor air stat in the same
area as a forced air roomstat presents serious control problems. A remote sensing
slab stat for the radiant floor removes this issue.
Remote sensing slab stat is required for storage applications.
ES-24-BR
SWITCHING RELAY - EE-5051 MULTI-BOILER - EB-C-STG5
This DPDT 24-volt switching relay provides a convenient
solution to any AC or DC application.
• Ideal for zone pumps
• 24V coil
• 120V, 10A, contact sets
• Easy to wire and nicely packaged
Electrically connects between 2nd and 3rd, 3rd and 4th, etc.
OTHER OPTIONS
SOT-1 Switchover to standby, total run time
5701 Single feed bus for 2 CB’s (SQ-D CB)
5702 Single feed bus for 3 CB’s (SQ-D CB)
EB-S-SB Dual boiler option for EB-S Series
WF-ANZ* WarmFlo Analyzer, now applicable to WO and
WA Series
Specifications subject to change without notice, all rights reserved.

07/24/2007 BL001
• Handled as the priority zone on multi-zone (EB-ZEA-1) or two
pump (EB-Z2P) controllers
• Priority switch on, zone 1 active - TS boiler automatically changes
to 150° (or selection 176°) supply water setting
• All other zones are held off
• With zone 1 satisfied or 60-minute timeout, the boiler automatically
returns to the preset temperature and reacts to the other zones
Low Temp High Temp
Radiant, slab Radiant, staple up
Radiant, slab Baseboard
Radiant, slab Fan coil
Radiant, slab Water heater, side arm
Radiant, slab Hanging unit heater (garage, shop, etc.)
These installation kits provide the critical plumbing components needed for easy installation of the Electro-Boiler. In addition to the
items shown in the matrix below, each kit includes all necessary ball valves, drain valve, tees, elbows, nipples, bushings, couplings,
etc. for direct connection to circulator pump and/or manifold.
Electro Industries’ boilers come standard equipped with outlet temperature/pressure gauge, pressure relief safety valve, and when
applicable, the WarmFloTM electronic control sensors. These kits provide the additional components for easy installation:
5585 - Mini-Boiler &
10 kW TS Series
5586 - TS Series, Standard 5578 - 3/4” Pipe
5582 - 1” Pipe
5579 - 1-1/4” Pipe
• 120V, 1/25 HP, maintenance-free wet
rotor circulator
• Pump curve example - 5 GPM (19 L)
@ 11 ft. of head (32.9 kPa)
• 120V, 1/6 HP, maintenance-free oil
lubricated circulator
• Pump curve example - 10 GPM (37.8 L)
@ 20 ft. of head (50.8 kPa) • Two flanges, with isolation valve
Model Application Return Gauge Expansion Tank Air Vent
EMB-BK All EMB Series 2.1 gal. (7.9 L), 40,000 Btu/h Basic float type
EMB-PK All EMB Series 2.1 gal. (7.9 L), 40,000 Btu/h Enhanced air separator, EAS
EB-PK-M EB-MS, -MA, -MO Series 4.5 gal. (17 L), 135,000 Btu/h Enhanced air separator, EAS
EB-BK-TS EB-S, -WA, -WO Series 4.5 gal. (17 L), 135,000 Btu/h Basic float type
EB-PK-TS EB-S, -WA, -WO Series 4.5 gal. (17 L), 135,000 Btu/h Enhanced air separator, EAS
TWO SUPPLY WATER TEMPERATURE REQUIREMENT
INSTALLATION PLUMBING KITS
CIRCULATING PUMPS

Page 1 of 2 XX017
Electro Industries, Inc.
Limited Product Warranty
Effective February 5, 2009
Electro Industries, Inc. warrants to the original owner, at the original installation site, for a period
of two (2) years from date of installation, that the product and product parts manufactured by
Electro Industries are free from manufacturing defects in materials and workmanship, when
used under normal conditions and when such product has not been modified or changed in any
manner after leaving the plant of Electro Industries. If any product or product parts
manufactured by Electro Industries are found to have manufacturing defects in materials or
workmanship, such will be repaired or replaced by Electro Industries. Electro Industries shall
have the opportunity to directly, or through its authorized representative, examine and inspect
the alleged defective product or product parts. Electro Industries may request that the materials
be returned to Electro Industries at the owner’s expense for factory inspection. The
determination as to whether product or product parts shall be repaired, or in the alternative
replaced, shall be made by Electro Industries or its authorized representative. Electro Industries
will cover reasonable labor costs to repair defective product or product parts for ninety (90) days
after installation.
TWENTY YEAR (20) LIMITED WARRANTY ON BOILER ELEMENTS AND VESSELS
Electro Industries, Inc. warrants that the boiler elements and vessels of its products are free
from defects in materials and workmanship through the twentieth year following date of
installation. If any boiler elements or vessels are found to have a manufacturing defect in
materials or workmanship, Electro Industries will replace them.
TWENTY YEAR (20) LIMITED WARRANTY ON SPIN FIN ELEMENTS
Electro Industries, Inc. warrants that the spin fin elements of its products are free from defects in
materials and workmanship through the twentieth year following date of installation. If any spin
fin elements are found to have a manufacturing defect in materials or workmanship, Electro
Industries will replace them.
FIVE YEAR (5) LIMITED WARRANTY ON OPEN WIRE ELEMENTS
Electro Industries, Inc. warrants that the open wire elements of its products are free from
defects in materials and workmanship through the fifth year following date of installation. If any
open wire elements are found to have a manufacturing defect in materials or workmanship,
Electro Industries will replace them.