Electro Industries EM-MC00 Series Installation instructions

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Installation & Operating Manual
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Packaged Make-Up Air
No Heat Models EM-MC00*, EM-MD00*, EM-ME00*, EM-MF00*, EM-MG00*
Included With This Product
 Permanent washable air filter
 Powered inlet damper
 (2) temperature sensors
 (1) current transformer (CT doughnut)
 Chain kit for ceiling installations
Other Requirements
 Low voltage (Class II type) wiring when using supply CT doughnut to control Make-Up Air unit
 High voltage wiring
 Fresh air intake wall or roof vent
 Inlet/outlet ductwork
Application
This product aids in preventing building depressurization where there is single or multi-source exhaust
points, coupled with a tight building envelope such as:
 Single, large exhaust source
- Kitchen range hood
 Single or multi-speed exhaust blower interface
 Multiple exhaust sources
- Bathroom fan, fireplace, dryer, gas furnace, dryer, etc.
Note
 In applications where the exhaust fan utilizes a multi-speed blower, this product has the ability to
sense each fan speed by monitoring the amperage of the exhaust fan motor. After completing the
mechanical portion of the installation, see Multi-Speed Setup for further details explaining how
to utilize this unique feature. Configuring the Make-Up Air unit to vary its speed to closely match
the blower speed of the external exhaust source blower motor allows for balanced system
operation.
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 (EC904) 2
System Status 2
Specification Table 3
Dimensional Drawings 3
Safety Consideration 4
Installation Requirements 4
Installation Overview 5
Mechanical Installation 6
Electrical Installation 9
Control Wiring 10
High Voltage Wiring 13
Basic Setup & Configuration 14
Software Configuration 15
Understanding the Product Display 16
Normal Operation Screens 17
Multi-Speed Setup 18
Operational Indicators 20
Start Up Inspection & Observations 21
Advanced Installation & Special Equipment Concerns 21
Troubleshooting 23
Routine Maintenance 25
LCD Display 26
Drawings UAW864
UAW865
XX017

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Product Description
This is a self-contained package with a permanent (washable) air filter, powered damper and blower. This
product has been designed specifically for outside air inlet.
All models (except EM-MB) include a multi-speed blower function; see Basic Setup & Configuration
for further detail.
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. When using CT doughnut, use Class II low voltage wiring methods to connect CT to Make-Up
Air unit.
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.

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System Status
STATUS LED
Status LED (front yellow LED) – is software driven LED which alerts the user that a message is
available in the message center.
 Status LED OFF = No message is available
 Status LED Blinking = Message is available
o To access available messages, the user must press and hold the “SELECT”
button for 3 seconds.
Possible messages:
 Faulty sensor (IN and/or OUT)
 Manual hi-limit
 Automatic hi-limit
 Software hi-limit
See Troubleshooting section for more information on viewing available messages.

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Specification Table
Model
CFM Volts Phase Internal
CB
Motor
FLA
Motor
HP
Max Fuse/
HACR
Amps
Duct
Connection
Max Static
EM-MC00-240-1-08 350 0.50” 240/208 1-50/60 Hz N/A 0.4 1/10 15A 8”
EM-MD00-240-1-10 600 0.50” 240/208 1-50/60 Hz N/A 0.8 1/5 15A 10”
EM-ME00-240-1-14 900 0.50” 240/208 1-50/60 Hz N/A 1.5 1/4 15A 14”
EM-MF00-240-1-14 1050 0.50” 240/208 1-50/60 Hz N/A 1.5 1/4 15A 14”
EM-MG00-240-1-14 1200 0.50” 240/208 1-50/60 Hz N/A 3.3 1/2 15A 14”
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, one current transformer (CT doughnut), inlet and
outlet temperature sensors, power open/power close damper, permanent washable filter and blower 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 hood
 Insulated inlet ducting
 Outlet ducting
 Additional current transformers (only for multi-fan applications)
 Low voltage wiring for the current transformer (CT)
 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. When using CT doughnut, use Class II low voltage wiring methods to connect CT to Make-Up
Air unit.
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.
General:
1. Select a location which will provide minimal noise vibration and minimal blower 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, etc.
5. The inlet and outlet ducting size is specified according to the model size and is shown in the
Dimensional Drawings section of this manual.
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:
Horizontal installation – Wall Mount:
Option A: Cover Facing Down
Option B: Cover Facing Side

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Vertical Installation – Wall Mount:

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Electrical Installation
Diagrams below represent general installation requirements. Due to various model sizes available, actual
unit mechanical and wiring requirements will vary dependent upon specific model.
Low Voltage Wiring
Temperature Sensors
Two temperature sensors are included, one used to sense inlet air temperature, the other to sense supply or
outlet air temperature. Without proper installation of these probes the Make-Up Air unit will not
operate correctly.

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Control Wiring
There are two “tie-in” options available in connecting the Make-Up Air unit to a vent hood or other
venting equipment.
 Option 1 – Connect an isolated “dry” switch or relay contact to the R & W terminal block (TB1).
 Option 2 – Connect the supplied current transformer (CT) to terminal block (TB2)
o CT terminal block (TB2) allows for connections for up to three CT’s, for use in
applications where multiple venting sources are utilized
Dry Type Switch Contact (Option 1)
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 (not CT provided with unit)
– Relay across exhaust blower motor
– End switch associated with exhaust damper/motor
– Room thermostat
Note: A switch closure between R & W (TB1) results in high speed blower output only.
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”.
NOTE: If using both Option 1 and Option 2, Option 1
(R&W) always has priority over Option 2 (CT). R&W
results in HI fan speed only.
Current Transformer (Option 2)
CT terminal block (TB2) – located on the left side of the
control module labeled “HI MED LO”. This terminal block
allows connection of up to 3 CTs, based on quantity of
exhaust sources. Please refer to the Advanced Installation
section in this manual for applications involving more than
one venting source. Connect supplied CT as shown below.
If the installation includes a multi or variable speed fan, see
the Basic Setup & Configuration section for further
details.
Standard installation:
*Switch closure across CT HI-MED-LO will not activate make-up air. Contact factory for special
wiring application.

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High Voltage Vent Hood Lighting
Note: For multi-speed vent hood installations, consideration must be made with vent
hoods that include higher wattage lighting. It is possible that the low speed trigger point
of the fan is equal to or lower than the current draw of the integrated lighting in the vent
hood itself. In this case, the CT must be installed at the motor in the vent hood minus the
lighting.
WARNING
DO NOT RETURN SOURCE POWER TO UNIT UNTIL CT SECONDARY IS TERMINATED AT
CONTROL BOARD. OPERATING THE VENT HOOD WITHOUT THE CT TERMINATED CAN
CAUSE DAMAGE TO THE CT AND A VERY HIGH SHOCK HAZARD.
Current Transformer Triggering – In order for the CT to properly
communicate external exhaust source blower motor on/off activity, it may
be necessary to provide one or more “wraps” of the power wire through the
CT.
These steps apply to all three CT paired inputs (HI, MED and LO):
1. From the external exhaust source blower motor nameplate or with actual clamp-on
current meter, note and record the external exhaust source blower motor current.
2. Depending upon the motor current, select the correct number of CT turns (see below
chart).
Motor Current CT Loops or Turns
Less than 1A 6 Wraps
2A to 3A 3 Wraps
4A to 6A 1 Wrap
Greater than 6A 0 Wraps
3. Temporarily disconnect power wire selected to feed through the CT. Depending upon the
needed turns through the CT above, either extend this wire or simply put the wire through
the CT hole as needed.

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4. Example – required three wraps, means the wire must go through the CT, loop back
around, and then loop back around the second time through before it’s terminated at its
original connection point.
5. The phasing or direction through the CT is not critical, simply one continuous wire.
6. The secondary side of the CT (pigtail wires) is connected at terminal block (TB2).
a. CT black wire, connect to either:
i. TB2-2, TB2-4 or TB2-6
b. CT red wire, connect to either:
i. TB2-1, TB2-3 or TB2-5.
Clothes Dryer Installations – When installing this product with a clothes dryer, make sure the
power wire which services both one leg of the heating element and the drum/fan motor is used.
Some dryers modulate the heating element on and off during the drying cycle which will cause
the Make-Up Air unit to shut off prematurely if the CT is installed on the power leg that services
the heating element only.
WARNING
DO NOT RETURN SOURCE POWER TO UNIT UNTIL CT SECONDARY IS TERMINATED AT
CONTROL BOARD. OPERATING THE VENT HOOD WITHOUT THE CT TERMINATED CAN
CAUSE DAMAGE TO THE CT AND A VERY HIGH SHOCK HAZARD.
Advanced Installation & Special Equipment Concerns section provides more information.

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High Voltage Wiring
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: Larger models include factory provided circuit breaker(s). This qualifies as a local
disconnect at the product.
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.
Note: Single feed bus kit is available for larger models, order part number 5701.

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Basic Setup & Configuration
Fahrenheit/Celsius Selection – Labeled “°F °C” (J22). This jumper allows for selection of degrees
Fahrenheit or Celsius to be displayed on the display.
NOTE: Factory default is °F. A power down reset is required upon changing of this jumper.
Blower Speed Adjustment – the blue adjustment dial allows for fine tuning the blower speed. If you do
not need full CFM of your application and desire a larger temperature rise, the blower speed can be
reduced with this adjustment dial. However, you must realize the CFM is being reduced and you must
maintain the appropriate requirement for balancing the building inlet to the outlet mechanical driven air.
NOTE: Factory default setting is low, full counter-clockwise. To increase speed turn dial clockwise.

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Software Configuration
Software Setup Based on Specific Application – Multiple applications exist for this product. The unit is
shipped preprogrammed for a range of applications with the ability to be reprogrammed to meet others.
Below are the most prevalent applications.
 Application one - single exhaust source single speed blower
 Application two - multiple exhaust source blower motors of different ratings
 Application three - single exhaust source multi-speed blower
Applications one and two are factory default settings and no further software setup is necessary to meet
these applications.
Applications one and two sequence:
 When the CT input to CT terminal block (TB2) labeled “HI” goes active, the unit blower will go
to high speed.
o If application one, sequence ends here.
 When the CT input to CT terminal block (TB2) labeled “MED” goes active, the unit blower will
go to medium speed.
 When the CT input to CT terminal block (TB2) labeled “LO” goes active, the unit blower will go
to low speed.
See Nominal CFM section for typical CFM air delivery.
Application three – software configuration is required in order to activate the multi-speed functionality
of this product when being used with a multi-speed vent hood. For instruction on how to configure for
multi-speed blower interlock, see the Multi-Speed Setup section.

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Understanding the Product Display
SELECT
Scroll through available
options during installation
and setup.
DISPLAY NEXT
Select available onscreen
options during field
installation and setup.
STATUS LED
Indicates whether or not a message is available:
Solid = No message available – status good
Pulsing = Message available
Note: If pulsing, press and hold select button.

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Normal Operation Screens
Under normal operating conditions, there are two screens that may be displayed based on system activity.
Screen one – Idle screen – displayed when the unit is off.
Screen two – Active screen – displayed when the unit is on.
Inlet Air Temperature Outlet Air Temperature
Desired Outlet Air
Temperature
(set point selection)
Blower Speed
(HI/MED/LO)
FAN OFF
IN = 30° OUT = 50°
DT = N/A CFM = HI

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Multi-Speed Setup
If your application includes a multi-speed blower, follow the setup steps in this section.
Step 1
Enter into “MULTI-SPD SETUP” mode:
Press and hold “SELECT” and “NEXT” for 5 seconds
FAN OFF
Step 2
Select “NEXT” to begin “MULTI-SPD SETUP”
(select HOME to return)
MULTI-SPD NEXT 
HOME
Step 3
Turn on vent hood to its highest setting, then press “NEXT”
SET EXT BL – HI
PRESS NEXT
NOTE: If display reads:
ERROR: 1 = 0.0A
PRESS NEXT
Check CT doughnut wiring to verify it is correct, then press “NEXT”
Step 4
If vent hood has a medium speed select Y, if not select N
MED SPD Y 
N