Electro Industries EM-MB01 Installation instructions

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Installation & Operating Manual
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Packaged Make-Up Air
Heat Models EM-MB01 & EM-MB02
Included With This Product
Permanent washable air filter
Powered inlet damper
Temperature sensor
Chain kit for ceiling installations
Other Requirements
Turn-on device (switch closure) connected to R & W (Class II wiring)
High voltage wiring
Fresh air intake wall vent
Inlet/outlet ductwork
Application
This product aids in preventing building depressurization where there is an exhaust blower/fan, coupled
with a tight building envelope.
Conforms to: UL STD.UL1995
Certified to: CSA STD.C22.2#236
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
Page
Product Description 1
Handling & Storage 1
Placement & Mechanical Information 1
Product Configurator 2
Specification Tables 2
Dimensional Drawings 3
Safety Consideration 4
Installation Requirements 4
Installation Overview 5
Mechanical Installation 6
Electrical Installation 8
Control Wiring 8
High Voltage Hookup 9
Basic Setup 10
Operational Indicators 11
Troubleshooting 12
Routine Maintenance 13
Replacement Parts 13
Drawings UAW873
XX017

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Product Description
This is a self-contained package with a permanent (washable) air filter, electric heating elements,
modulating element temperature control, powered damper and fan. This product has been designed
specifically for outside air inlet.
All models include WarmFlo electronic outlet temperature sensor and associated control circuitry to
modulate the electric elements for a fixed outlet temperature. This means the electric element is only used
to make-up or heat the outside fresh air to the preset temperature point. There is no overheating or
inefficient use of the electric element.
Heating elements are locked out when this unit’s outlet air temperature is greater than the set point dial
switch.
Diagrams used throughout the installation manual represent general installation requirements. Due to
various model sizes available, actual unit mechanical and wiring requirements will vary dependent upon
specific model.
Handling & Storage
Receiving
It is the receiver’s (person and/or company signing off on the receiving Bill of Lading) responsibility to
inspect for shipping damage. All shipping claims must be made by the receiver.
Storage
Packed or unpacked, the Make-Up Air unit shall not be exposed to rain, snow, or other adverse
environment. This product is designed for in-building storage and installation only.
As much as possible this product must be protected throughout the construction phase to avoid
accumulation of dust and moisture on the components and control box. The installing contractor is
responsible for maintaining the cleanliness and quality of this unit until installation is complete and
approved by the user/end customer.
Placement & Mechanical Information
This product is designed for zero clearance, but use the following mounting and spacing criteria:
1. Unit can be installed vertically or horizontally. When vertical, inlet must face down.
2. Make mounting provisions for a 1” air space at the top.
3. The sides, any location, can be in direct contact with wood framing materials.
4. No materials shall be in contact with the cabinet housing which has a flame point less than wood,
300°F (150°C).
5. Product shall be installed in a conditioned space only.
6. Heating elements are locked out when outlet air temperature is > set point dial switch.

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Specification Tables
Temperature Rise & CFM Chart
Model SINGLE PHASE MODELS
MB01 MB02
CFM CFM
Required
Temp Rise
80° F 39 63
70° F 45 72
60° F 53 84
50° F 63 101
40° F 79 126
30° F 105 168
Specifications
Model kW Btu/h Amps Internal
CB Motor FLA Motor HP Phase Voltage CFM Max Fuse/
HACR Duct Connection
Max Static
EM-MB01-120-1-06 1 3,412 8.3 N/A 0.5 1/18 1-50/60 Hz 120 150 0.03” 15A 6”
EM-MB02-120-1-06 1.6 5,459 13.3 N/A 0.5 1/18 1-50/60 Hz 120 150 0.03” 20A 6”

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Dimensional Drawings

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Safety Consideration
WARNING
BEFORE PERFORMING SERVICE OR MAINTENANCE OPERATIONS ON A SYSTEM, TURN OFF
MAIN POWER SWITCHES TO THE INDOOR UNIT. IF APPLICABLE, TURN OFF THE ACCESSORY
HEATER POWER SWITCH. ELECTRICAL SHOCK COULD CAUSE PERSONAL INJURY.
Installing and servicing electric heating equipment can be hazardous due high voltage and electrical
components. Only trained and qualified service personnel should install, repair or service heating and air
conditioning equipment. Untrained personnel can perform the basic maintenance functions of cleaning
coils and cleaning and replacing filters. All other operations should be performed by trained service
personnel. When working on heating and air conditioning equipment, observe precautions in the
literature, tags and labels attached to the unit and other safety precautions that may apply, such as the
following safety measures:
Follow all safety codes.
Wear safety glasses and work gloves.
Installation Requirements
1. All installation work must be performed by trained, qualified contractors or technicians. Electro
Industries sponsors installation and service schools to assist the installer. Visit our Website at
www.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 safety certification label, and manufacturer product liability. Electro Industries cannot be
held responsible for field modifications, incorrect installations, and conditions which may
bypass or compromise the built-in safety features and controls.
CAUTION
This unit shall not be operated (either heating section or blower) until the interior of the
structure is completed and cleaned. This also means all duct work must be complete with
filter, etc. Manufacturer’s warranty is void if this unit is operated during structure
construction.
CAUTION
Hazards or unsafe practices could result in property damage, product damage, severe personal
injury and/or death.
2. At Electro Industries the safety of the installer and the end user is of highest priority. 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. Professional installers should be trained and experienced in the areas of
handling electrical components, sheet metal products, and material handling processes.

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Installation Overview
This Make-Up Air unit contains interface/logic devices, outlet temperature sensor, power open/spring
close damper, permanent washable filter and fan motor. Based on the application, other system
components may be required to make your system operate as desired. These components must be
provided by the installing contractor. These components may include but are not limited to:
Outside inlet hood
Insulated inlet ducting
Outlet ducting
The turn-on method or switch
-Remote damper with END switch (also see Control Wiring section)
-Current sensing switch, building exhaust fan/blower
-Relay contact detecting the building exhaust fan/blower running
Source power wiring
Refer to the below diagrams which show various system configurations.
Make-Up Air Independent System Make-Up Air Combined Return Tie-In &
Independent System
Make-Up Air Return Tie-In System

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Mechanical Installation
This product is designed for zero clearance, but use the following mounting and spacing criteria:
1. Unit can be installed vertically or horizontally. When vertical, inlet must face down.
2. Observe the airflow direction decal and the inlet decal.
3. Make mounting provisions for a 1” air space at the top.
4. The sides, any location, can be in direct contact with wood framing materials.
5. No materials shall be in contact with the cabinet housing which has a flame point less than wood,
300°F (150°C).
6. Product shall be installed in a conditioned space only.
7. Heating elements are locked out when outlet air temperature is > set point dial switch.
General:
1. Select a location which will provide minimal noise vibration and minimal fan noise to the
building occupants.
2. The outside hood and ducting material are not included with this unit. It is the installer’s
responsibility to provide the necessary weather protection for the inlet.
In cold climates, insulated ducting must be used between the outside inlet air hood and the
inlet of this unit.
3. Install unit with a slight air inlet incline (housing outlet end is ¼” higher than inlet end).
4. The unit can be mounted within the ceiling (between joists where it will fit) or ceiling hung, at
any convenient location between the outside inlet hood and the fresh air discharge connection.
The discharge connection is wherever the conditioned fresh air is distributed within the
building – furnace cold air return, special ducting, hallway register, furnace room, etc.
5. 6” inlet and outlet ducting is adequate for these two mini models.
Note: In cold climates, frost and or condensation may collect on metal parts of this product. External field
provided insulation may be required in certain situations. The inlet damper and insulated inlet piping will
prevent cold air migration and a slight incline will keep moisture collection at the inlet end.

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Horizontal installation – Ceiling Mount Vertical Installation – Wall Mount
Horizontal installation – Wall Mount
Option A: Cover Facing Down Option B: Cover Facing Side

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Electrical Installation
Temperature Sensor
Heated air outlet temperature sensor is included. Without proper installation of this probe the Make-
Up Air unit will not operate correctly.
The sensor probe/cable is attached to the control board. However, the sensor probe must be installed
external to this unit. Install in the warm air outlet duct, 24” to 36” away from discharge fan.
Control Wiring
Dry Type Switch Contact
This on and off control contact applied across R and W depends upon installation requirements and can
take on several possibilities:
Pressure differential switch
CT with integrated switch contact
Relay across exhaust blower motor
End switch associated with exhaust damper/motor
Connection Details
Connect one side of the field provided switch to the TB1 R
and the other side of the switch to the TB1 W.
External Damper, Field Furnished and Installed
If this installation requires or desires a power damper at the
through-wall hood, this can be field furnished and wired
using the following guidelines:
Required is a 24VAC power to open, spring close.
Note: It is assumed the existing power damper will be removed, damper blocked open, or actually used in
parallel with the field added damper.
External damper without end switch:
1. Locate the two wires connected to the existing damper (violet and gray).
2. Splice and extend these two wires (powered to open) to the external damper, powered to open.
External damper with end switch:
1. The external damper motor is driven from the exhaust blower turn-on contact closure or device.
2. Locate the external damper END switch closed when open contact terminals or two wires.
3. Extend these two wires to the R and W terminal block.
4. Sequence:
a. With this arrangement (paragraph 1 above) there is no other turn-on device (current
switch, thermostat, airflow switch, etc.)
b. When the exhaust blower comes on, that same component or mechanism also opens this
external damper.
c. When the external damper end switch closes it turns on this Make-Up Air unit, at R to W.
d. All other functions now begin with the R to W turn-on.

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High Voltage Hookup
Service Panel Circuit Breaker(s) Sizing – based upon unit size, the specification page shows
appropriate service size requirements based on UL and NEC code.
Note: These two models require 120VAC source (not 240).
Source Power – route and install proper current carrying conductors as per local code requirements, from
service panel. Nameplate shows current and kW rating. Use copper wire only.
Safety Ground – copper wire is required, do not depend upon metal conduit.

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Basic Setup
Temperature Set Point – Located on the control board is a dial labeled SW1. This dial is used to set the
desired output temperature.
Setting the desired output temperature is completed in two steps. See Figure 1 for temperature ranges.
Step 1 – Determine the required temperature output for the application.
oHINT: Most Make-Up Air applications suggest an output set point typically
around 50°F.
Step 2 –using a small screwdriver, adjust the WARM AIR dial according to the desired
operating temperature.
Step 3 – Verify mode is set to #7.
FIGURE 1
Factory default, position 6 (50° F)
NOTE: MODE dial must = #7
Fan Speed Adjustment – located in the hinged cover low voltage compartment and on the divider is a
plastic shaft knob which allows for fine tuning the fan speed. If you do not need full CFM for your
application and desire a larger temperature rise, the lower factory default set speed may be adequate.
However, you must realize the CFM must maintain the appropriate requirement for balancing the building
inlet to the outlet mechanical driven air.
NOTE: Factory default setting is low, full clockwise. To increase speed turn dial counter-
clockwise.
COMMENT: The fan low speed is approximately 120 CFM.
WARM AIR
Switch Position °F
0 20
1 25
2 30
3 35
4 40
5 45
6 50
7 55

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Operational Indicators
Green LED – on control board.
Full on = low voltage present and okay, micro controller is functioning, etc.
One pulse = electric heating element is active (set point is still controlling actual element on/off).
Two pulses = bad outlet temperature sensor.
Three pulses = control hi-limit open.
R to W closed contact – external switch device.
Fan is running.
Inlet damper is opening and held open.
-Inlet damper is spring close.
Control board – heat active (set point is still controlling actual element on/off).
Fan relationship to electric heating elements – fan comes on immediate with R to W contact. There is
a 30-second delay before elements turn on (outlet sensor needs to measure inlet air, not room air). The
fan also purges the inside elements and warm air after R to W is open for 60 seconds.
Hi-limit, manual reset – all operations seem normal, but the heating element power is interrupted.
The reset button is in the hinged door compartment, on control box divider.
Auto reset hi-limits – there are two.
Temperature control, at fan inlet, this is set for an approximate 90° F outlet temperature. It is in
the low voltage logic control circuit. LED will show 3 pulses.
Comment – this is in addition to the outlet temperature sensor mounted within the discharge duct
which responds to the set point temperature dial.
Element current carrying leg – within the sheet metal housing/inside deflectors, this is a safety hi-
limit in case there is a fan failure or major inlet air restriction.
Disconnected or bad detected sensor – LED will show two pulses. The electric elements or heat active
is at 100% on, follows the R-W input. With an inactive duct sensor the electric elements are no longer
controlled at set point.

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Troubleshooting
1. This product contains several interference suppression components, but as an electronic logic
product unpredictable and unusual transients or interferences may sometimes cause strange
results. If this product is acting strange, turn off the source power, count to 10, and reenergize.
2. Terminal blocks are clamp-down type. 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 a screw head, you may get erroneous or unpredictable results if
the screw is not tightened down.
3. Use general heating system logic information and basic understanding of the terminal block
wiring functions when measuring voltage to determine proper operation of this module.
Outlet Temperature Sensor
See previous page relating to LED indication and bad sensor operation.
The green LED is an indication that the micro program cannot read a temperature value. This sensor test
or indication does not determine a bad temperature reading, it simply indicates there is software
communication to the sensor itself.
Temperature Sensor Detail
Red wire to J2-1 +5VDC or RED
Black wire to J2-2 DATA or BLK
White wire to J2-3 COM or WHT
Air Filter
A dirty filter can lead to poor system performance and eventual hi-limiting. It is suggested to wash filter
at least twice per year. See Routine Maintenance for instruction on how to wash the filter.
Control Fuse
The low voltage source fuse is a 2A fast blow. A spare fuse is included (next to the operating fuse).
Manual Reset Hi-Limit
Inside the hinged door compartment is a small red button for manually resetting the highest temperature
safety cutout limit. The small red stem will be out approximately ¼”, and there is a snap feeling if it was
activated or opened. Using indicator lights, etc. to troubleshoot this manual reset must be carefully
thought through. The four indicators are:
Control board LED, one pulse
SSR (triac) LED will be on
No element amps or current
No heat
COMMENT: A bad SSR (triac) may have the same observation as an activated manual reset,
diagnose carefully.

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Routine Maintenance
Filter – this unit includes an air filter which is a permanent and washable filter.
Suggest at least twice per year removing filter and using standard household water to back flush collected
dust/debris.
Remove screws from small door, opposite the hinged door end
Filter is simply held within channels
Replacement Parts
Part Number Description
4037KIT REPLACE TRIAC SSR 50AMP 24-280 VAC
4341 BLOWER SPEED CONTROL 120V
5541 TRANSFORMER 120/240:24 40VA CHNN
5609 LIMIT O-100/C-AMP @ VAC
5610 LIMIT O-99/C-85 10AMP @240VAC
5611 LIMIT 150F CAP BULB MAN RESET
EM5621 ELEMENT EM RND 2.5@240 23 OHM
EM6613 ELEMENT WX 1@120 14.6 OHM
WFCD25605 PCB ASSEMBLY WF 2 STAGE DUCT SENSOR MODE DIAL
UFUSE0440 FUSE 2A 250V GLASS FAST ACT
VLUG5527 LUG 2 POLE 4-14AWG 4-.250 QUICK CONNECT

DECAL + TITLEBLOCK DO NOT PRINT AS DECAL

Page 1 of 2 XX017
Electro Industries, Inc. Residential
Limited Product Warranty
Effective November 1, 2009
Electro Industries, Inc. warrants to the original owner, at the original installation site, for a period of two (2)
years fro date of original purchase, that the product and product parts anufactured by Electro
Industries, Inc. are free fro anufacturing defects in aterials and work anship, when used under
nor al conditions and when such product has not been odified or changed in any anner after leaving
the plant of Electro Industries, Inc. If any product or product parts anufactured by Electro Industries,
Inc. are found to have anufacturing defects in aterials or work anship, such will be repaired or
replaced by Electro Industries, Inc. Electro Industries, Inc., shall have the opportunity to directly, or
through its authorized representative, exa ine and inspect the alleged defective product or product parts.
Electro Industries, Inc. ay request that the aterials be returned to Electro Industries, Inc. at owner’s
expense for factory inspection. The deter ination as to whether product or product parts shall be
repaired, or in the alternative, replaced, shall be ade by Electro Industries, Inc. or its authorized
representative.
Electro Industries, Inc. will cover labor costs according to the Repair / Replace ent Labor Allowance
Schedule for a period of ninety (90) days fro the date of original purchase, to the original owner, at the
original installation site. The Repair / Replace ent Labor Allowance is designed to reduce the cost of
repairs. This Repair / Replace ent Labor Allowance ay not cover the entire labor fee charged by your
dealer / contractor.
WEN Y YEAR (20) LIMI ED WARRAN Y ON BOILER ELEMEN S AND VESSELS
Electro Industries, Inc. warrants that the boiler ele ents and vessels of its products are free fro defects
in aterials and work anship through the twentieth year following date of original purchase. If any boiler
ele ents or vessels are found to have a anufacturing defect in aterials or work anship, Electro
Industries, Inc. will replace the .
WEN Y YEAR (20) LIMI ED WARRAN Y ON SPIN FIN ELEMEN S
Electro Industries, Inc. warrants that the spin fin ele ents of its products are free fro defects in aterials
and work anship through the twentieth year following date of original purchase. If any spin fin ele ents
are found to have a anufacturing defect in aterials or work anship, Electro Industries, Inc. will replace
the .
FIVE YEAR (5) LIMI ED WARRAN Y ON OPEN WIRE ELEMEN S
Electro Industries, Inc. warrants that the open wire ele ents of its products are free fro defects in
aterials and work anship through the fifth year following date of original purchase. If any open wire
ele ents are found to have a anufacturing defect in aterials or work anship, Electro Industries, Inc.
will replace the .

Page 2 of 2 XX017
CONDITIONS AND LIMITATIONS:
1. This warranty is limited to residential, single family dwelling installations only. Any commercial or multi-unit
dwelling installations fall under the Electro Industries Commercial Limited Product Warranty.
2. Electro Industries, Inc. shall not be liable for performance related issues resulting from improper installation,
improper sizing, improper duct or distribution system, or any other installation deficiencies.
3. If at the time of a request for service the original owner cannot provide an original sales receipt or a warranty
card registration then the warranty period for the product will have deemed to begin the date the product is
shipped from the factory and NOT the date of original purchase.
4. The product must have been sold and installed by a licensed electrician, plumbing, or heating contractor.
5. The application and installation of the product must be in compliance with Electro Industries, Inc. specifications,
as stated in the installation and instruction manual, and all state, provincial and federal codes and statutes. If
not, the warranty will be null and void.
6. The purchaser shall have maintained the product in accordance with the manual that accompanies the unit.
Annually, a qualified and licensed contractor must inspect the product to assure it is in proper working condition.
7. All related heating components must be maintained in good operating condition.
8. All lines must be checked to confirm that all condensation drains properly from the unit.
9. Replacement of a product or product part under this limited warranty does not extend the warranty term or
period.
10. Replacement product parts are warranted to be free from defects in material and workmanship for ninety (90)
days from the date of installation. All exclusions, conditions, and limitations expressed in this warranty apply.
11. Before warranty claims will be honored, Electro Industries, Inc. shall have the opportunity to directly, or through
its authorized representative, examine and inspect the alleged defective product or product parts. Remedies
under this warranty are limited to repairing or replacing alleged defective product or product parts. The decision
whether to repair or, in the alternative, replace products or product parts shall be made by Electro Industries, Inc.
or its authorized representative.
THIS WARRANTY DOES NOT COVER:
1. Costs for labor for diagnosis, removal or reinstallation of an alleged defective product or product part,
transportation to Electro Industries, Inc., and any other materials necessary to perform the exchange, except as
stated in this warranty. Replacement material will be invoiced to the distributor in the usual manner and will be
subject to adjustment upon verification of defect.
2. Any product or product part that has been damaged as a result of being improperly serviced or operated,
including, but not limited to, the following: operated during construction phase, with insufficient water or air flow;
allowed to freeze; subjected to flood conditions; subjected to improper voltages or power supplies; operated with
air flow or water conditions and/or fuels or additives which cause unusual deposits or corrosion in or on the
product; chemical or galvanic erosion; improper maintenance or subject to any other abuse or negligence.
3. Any product or product part that has been damaged as a result of natural disasters, including, but not limited to,
lightning, fire, earthquake, hurricanes, tornadoes or floods.
4. Any product or product part that has been damaged as a result of shipment or handling by the freight carrier. It
is the receiver’s responsibility to claim and process freight damage with the carrier.
5. Any product or product part that has been defaced, abused or suffered unusual wear and tear as determined by
Electro Industries, Inc. or its authorized representative.
6. Workmanship of any installer of the product or product part. This warranty does not assume any liability of any
nature for unsatisfactory performance caused by improper installation.
7. Transportation charges for any replacement product, product part or component, service calls, normal
maintenance; replacement of fuses, filters, refrigerant, etc.
THESE WARRANTIES DO NOT EXTEND TO ANYONE EXCEPT THE ORIGINAL PURCHASER AT RETAIL AND ONLY WHEN THE PRODUCT IS
IN THE ORIGINAL INSTALLATION SITE. THE REMEDIES SET FORTH HEREIN ARE EXCLUSIVE.
ALL IMPLIED WARRANTIES, INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE
HEREBY DISCLAIMED WITH RESPECT TO ALL PURCHASERS OR OWNERS. ELECTRO INDUSTRIES, INC. IS NOT BOUND BY PROMISES
MADE BY OTHERS BEYOND THE TERMS OF THESE WARRANTIES. FAILURE TO RETURN THE WARRANTY CARD SHALL HAVE NO
EFFECT ON THE DISCLAIMER OF THESE IMPLIED WARRANTIES.
ALL EXPRESS WARRANTIES SHALL BE LIMITED TO THE DURATION OF THIS EXPRESS LIMITED WARRANTIES SET FORTH HEREIN AND
EXCLUDE ANY LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES RESULTING FROM THE BREACH THEREOF. SOME STATES
OR PROVINCES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THE ABOVE
LIMITATIONS OR EXCLUSIONS MAY NOT APPLY. PRODUCTS OR PARTS OF OTHER MANUFACTURERS ATTACHED ARE SPECIFICALLY
EXCLUDED FROM THE WARRANTY.
THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, AND YOU MAY HAVE OTHER RIGHTS WHICH VARY UNDER THE LAWS OF EACH
STATE. IF ANY PROVISION OF THIS WARRANTY IS PROHIBITED OR INVALID UNDER APPLICABLE STATE OR PROVINCIAL LAW, THAT
PROVISION SHALL BE INEFFECTIVE TO THE EXTENT OF THE PROHIBITION OR INVALIDITY WITHOUT INVALIDATING THE REMAINDER OF
THE AFFECTED PROVISION OR THE OTHER PROVISIONS OF THIS WARRANTY.