WarmFlo HE-A-**-21 Series Manual

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WarmFlo®Electric Furnace
Installation & Operating Instructions
HE-A-**-21 Series
All HE-A-**-21 Electric Furnaces must use one of two chip codes based on applications
An AHS chip code: forced air space heating applications
WFMU chip code: make-up air applications.
If you have a chip code other than AHS or WFMU, please call factory for assistance.
Application
Forced Air Space Heating:
This model series is outlet warm air sensing only for non-heat pump applications. With a preset warm air
temperature, the electric elements modulate to maintain this preset temperature based on the sensing of
the supply sensor (ST). The CFM requirement will always have to be setup for full electric capacity.
Heat/cool conventional room thermostat applies
Make-Up Air Heating:
Fresh air code requirements and/or appliances which could
create unhealthy negative pressure within the building.
Building usage, people loading
Air environment within building
Fireplace
Larger kitchen vent hoods
Appliances, without sealed combustion
Single vent gas furnace or water heater
Forced exhaust systems - restrooms, bathrooms,
kitchens, etc.
DO NOT DESTROY THIS MANUAL. PLEASE READ CAREFULLY AND KEEP IN A SAFE
PLACE FOR FUTURE REFERENCE BY A SERVICE TECHNICIAN.
Drawings: NH806, NH807, NH819, NS802, EC001, XX017

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Table of Contents
Configurator 1
Inlet Cabinets 2
General Comments 3
Application 4
Installation Requirements 6
Mechanical Installation 7
Electrical Installation 9
Setup or Programming 11
Operation Indicators 12
Handheld Analyzer/Laptop Software 13
Troubleshooting 13
Replacement Parts 15
Drawings Included: NH806
NH807
NS802
EC001
XX017

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Configurator
HE-T-KW-CW
Type Cabinet Width
H, A, E, N 21 = 21”
(see below) 24 = 24”*
kWSize
10 = 9.6 kW
15 = 14.4 kW
20 = 19.2 kW*
25=24kW*
30 = 28.8 kW*
Type
All models – ECM™ blower motor, setup selection of four cooling sizes, 50% continuous air (fan – on
setting). High efficient air circulation at about 50-watt.
H= Full WarmFlo capability with outdoor sensor. This provides warm air outlet temperature dial
selection and supply air ramp up with the decrease of outdoor temperature. This WarmFlo
feature definitely applies to heat pumps, but it is also the top of the line comfort for straight
electric, with air conditioning. The warm air dial suggested setting is 96° or 100° and the front
dial selects the rate of ramp up or temperature increase based upon outdoor. The “C” setting
will provide 114° warm air at 0° or 125° at -20° F outside. The ECM™ blower also ramps up
in speed as there is an increase in supply temperature or decrease in outdoor temperature.
Depending upon setup selection, the moderate heating blower speed could be as low as 60% of
full capacity and full capacity blower is only used below 30° outdoor.
Heat/cool conventional thermostat must be used in non-heat pump applications
Basic heat pump room thermostat must be used in all heat pump applications.
A= WarmFlo element modulation based upon a warm air set point and duct sensor. Heating blower
speed is installation setup per kW size. A higher CFM selection can be made if there is a desire
to “work” WarmFlo harder.
Heat/cool conventional thermostat applies.
E= Non-WarmFlo, 10, 15, or 20 kW built-in strip heat, direct function of roomstat W. Setup
selection determines nominal ECM™ motor speed. A thermostat “E” type function could be
used to jump to full speed.
N = Cabinet only, no electric elements or WarmFlo. This could typically be associated with an inlet
hydronics water coil. Control board includes a relay for pump, initiated with input W. Setup
selection determines heating blower speed. Cooling speeds and air conditioning interface are
the same as mentioned above.
Note: Two-speed and multi-function room thermostat can also be configured with this system by adding
WF-HP2 interface controller.

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Inlet Cabinets
Factory optional cabinets can be configured with this Electric Furnace. Typically these are designed for
upflow applications; however, the heat pump coil cabinet could be used in other positions.
Side Entry, Filter Cabinet
Return air can be ducted into either side, 15-⅜” x
19” cutout hole is provided with one filler plate.
Easy access door for checking and changing filter.
Adjustable rails are provided for standard 4” x 20”
x 20” pleated filter.
Filter examples include Honeywell 203721, BestAir
HW2020, or Grainger®6B936.
Standard 1” filter (20” x 20”) – field installer could arrive at filter filler bracket for slip-in within the
provided rails.
Comment – The 3M MERV filter airflow resistance needs to be considered in duct design
calculations. Per specification information from 3M the static pressure drop across the 1”, Series
1000, MERV 11 filter is 0.2” SP.
Hydronics Coil and Cabinet
The inlet cabinet includes a water coil with
parameters shown. The return air connection must
be on a side which allows coil draw-through. The
cabinet can be reversed for either left or right side
entry. The inlet for this cabinet is sized for an
externally installed packaged return air filter cabinet
– typical 20” x 20” size.
1. Nominal or rated Btu/h, 50,000
2. Recommended CFM setup, 1100 min.
3. Inlet water 120° at 10 GPM minimum.
4. Expected outlet air temperature, 115°
Reduced CFM and/or inlet water temperature will
reduce Btu/h rating.

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General Comments
Upflow/Downflow/Horizontal
The arrangement of refrigerant coil, hydronics coil, and built-in electric elements need to follow specific
air direction or airflow rules, but the orientation of this Electric Furnace is not critical.
For upflow and horizontal standard air conditioning applications; the A-coil is mounted at the blower
outlet with field provided plenum or AC manufacturer’s case coil.
All models contain GE ECM™ Series 2.3 blower motors. The special Electro Industries interface board
allows hookup for heat/cool conventional or basic heat pump room thermostat. Blower speed setup and
WarmFlo sensor control are separate for cooling and heating (unique).
The ECM™ motor provided in this unit has many features not available in a standard motor.
-Improved efficiency
-Constant CFM
-Soft start and stop
-Better humidity control
The provided ECM™ motor contains permanently sealed bearings and does not require oiling.
Utility Load Control
Provisions are included for the Utility Receiver to interrupt compressor and WarmFlo or strip heat. No
provisions for dual heat, add EE-5046.
Zone Controller/Dampers
When using models HE-A or HE-H Series there are no adverse electrical heat concerns associated with a
zone damper system. However, there may be an effect on the heat pump compressor due to potential
reduced airflow. The zone dampers themselves must be in the horizontal ducts after the WarmFlo duct
sensor and at least 12” downstream of the WarmFlo sensor.
The zone controller “HVAC equipment” terminal block simply connects to this unit’s control board as if
it was a room thermostat to this unit. If the various zone sizes produce high static pressure and reduced
airflow, the WarmFlo temperature sensing technology will reduce the electric elements automatically.
If the zone damper action has an adverse effect on the heat pump compressor, Electro has zone controller
staging interface for 2-speed heat pump application (WF-HP2, etc.).
Side by Side, with Gas Furnace or Other Dual Heat Arrangements
Add-on dual heat controller HP-5046 can simplify the wiring for dual heat.
For side by side ducting, a motor operated damper is required to isolate the return air between two
blowers. The operation of this motor damper can be controlled from the HP-5046.
Installation Setup
There are specific peg jumpers relating to cooling tons, heating kW, heat pump reversing valve logic, and
thermostat type. These must be properly evaluated and selected to match each installation.
The “setup or programming” section has all the detailed instructions and selection tables.
The WarmFlo controller also has various dial switch selections relating to duct temperature set point,
minimum warm air set point, HP compressor ODT shutoff temperature, and ramp up efficiency dial.
These are standard WarmFlo technology and setup requirements, if you’re not familiar with WarmFlo
controller study the HD320 WarmFlo information document, also in this package.

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NOTICE: When changing any setup jumpers, power down and up. ECM™ motor needs 240V power
and control power removed to reset and reread specific control lines. Open CB number 1 for 10 seconds.
Operation Instructions
The “Operation Indicators” section contains information relating to LED monitor lights, thermostat
sequences, etc.
Installation Checkout
Attached to this manual is a warranty certification and checkout procedure. This must be completed and
returned for warranty coverage. This is the responsibility of the contractor or company which “sold the
job” and is assuming responsibility to the end customer.
Warranty Statement
See the last page of this manual for detailed limited warranty coverage explanation.
Application
General
The configurator, previous page, details several product types. Re-verify nameplate on your received unit
to make sure it properly represents the product type you need for your installation/application.
The setup control board jumpers provide ECM™ blower motor speed flexibility to match the model and
your heat/cool size requirements.
This specific model series, HE-A-**-**
This model series is outlet warm air sensing only. With a preset warm air temperature, the electric
elements modulate to maintain this preset temperature based on the sensing of the supply sensor (ST).
The CFM requirement will always have to be setup for full electric capacity.
Make-Up Air Applications
Located on the WarmFlo board (logic controller) is a 40-pin microcontroller chip. On this chip is a white
sticker which indicates chip version (V2.3*) and chip code. This correct chip code for make-up air
applications is WFMU which has a specific temperature range options for make-up air applications.
Backup or Assist Wood Heating
This WarmFlo Electric Furnace is ideal for accompanying a wood heating system. The WarmFlo
technology and sensors will determine the Btu/h heating requirement of the building. If the wood warm
air is below the requirement, a small portion (or as required) of the electric elements will come on
automatically supplementing the wood heat.
Using a wood boiler with the water coil inlet option is an ideal arrangement.
If using a forced wood system, caution must be used when allowing the wood warm air to enter through
the ECM™ motor blower. The maximum temperature for the ECM™ motor is approximately 120° F.

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Specification Chart
Model Number HE-A-10-21 HE-A-15-21 HE-A-20-21
Cabinet Width 21” 21” 21”
kW rating 10 15 20
Btu/h 34000 51000 68000
Voltage/Phase 240/1 240/1 240/1
Circuit Breaker 60 1-60, 1-30 2-60
Amps per CB 42 42, 21 42, 42
Source Feed 1 2 2
Elements 4 6 8
Relays 2 4 6
Heat CFM* 765 (LO) 900 (M) 1035 (HI)
Max. Temp. Rise 45° F 45° F 45° F
Shipping Weight
*WarmFlo sensing will override this to 1200 CFM.
Product Dimensions

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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. If this is a Dual Heat system, this product relates only to the addition to the furnace ducting system
external to the gas or oil force air furnace. The owner/ installer assumes all responsibility and/or
liability associated with any needed installation of the gas/oil furnace, fuel system, flue, chimney, 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
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. Both manufacturers’ warranties are 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.
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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Mechanical Installation
Clearances and Accessibility
Zero clearance is allowed on all sides for combustible materials. However, 36” should be allowed at the
front for operation, maintenance, and service.
To reduce the risk of rusting and appearance, do not install the unit directly on the ground or on a floor
that is likely to be wet. In such environments the unit must be elevated by use of a sturdy non-porous
material.
General Ductwork and Airflow Requirement
Design the airflow ductwork to meet the maximum operating airflow (CFM) for the kW and cooling ton
requirements (whichever is larger). This document does not provide installation and design information
for the ductwork external to this product. It is assumed this is being accomplished by a professional and
trained installer understanding ductwork design, airflow/static pressure resistance, and forced air
distribution systems. Key requirements information:
-Heating and cooling blower speed or minimum CFM is setup independently. See the “Blower
Speed Selection” to match the airflow capacity with the ducting design.
-The airflow distribution system shall be designed for a maximum of 0.5” SP. Ideally the design
should be set at 0.3” to 0.4” SP.
-The variable speed, ECM™ motor, is sensitive to inlet static pressure. In order for the motor to
arrive at the setup CFM (motor RPM adjust according to static pressure) the inlet must have a
minimum resistance of about 0.15 to 0.2. If you do not have return air ducting and you’re simply
allowing free return air circulation through a filter at this Electric Furnace inlet, you may need to
have a slight restriction in order for the blower motor to arrive at its setup speed.
-All transitions must have a slope of 30° to 45°. There shall be no 90° bends or surfaces causing
airflow bounce/eddy current.
-The manufacturer strongly recommends the return air entering the bottom (under the blower) of
the cabinet. For smaller kW and smaller cooling (10 kW or 2-ton) it is permissible to bring the
air in on either side of the 32” cabinet.
-Previous Specification Chart shows the minimum CFM associated with the kW. Again this is
setup as detailed in the “Setup or Programming” section.
-The cooling CFM is also selected but is not shown on the Specification Chart. In many cases the
airflow distribution system is probably designed to meet the cooling requirement.
-The room registers and individual 5” or 6 “ runs must also match the total setup or planned CFM
for this installation. Typically a 6” round and a typical room register is rated at 100 CFM.
-All distribution ducts (supply and return) must be sized for the setup or planned total CFM
requirement. The attached duct sizing chart shows various distribution duct sizes relating to their
ability to properly handle the stated CFM.
-Seal connections between this unit and ductwork, all ductwork connections, etc. as required to
reduce or eliminate air leakage. Sealing all connections will also reduce air noise.
Comment: The ECM™ motor efficiently relates to system static pressure. On one hand a minimum of
about 0.2” SP is required for the motor to adjust itself, but above 0.3” it begins to drain high current. For
information, consider (at 240):
1.0” SP – 3.4A
0.8” SP – 2.5A
0.5” SP – 0.9A
0.2” SP – 0.4A
Continuous Air – 0.25A

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Whether this unit is sitting on or attached to an inlet cabinet, field designed inlet cabinet, or horizontal
supports; verify proper support and mechanical strength is provided within the system installation.
Rubber isolation pads should be used where possible to reduce sound and vibration transmission.
WARNING
WHEN HANGING THIS UNIT, THERE MUST BE UNDER SUPPORTS WHICH DISTRIBUTE THE
HANGING CHAINS ACROSS THE SURFACE OF THIS UNIT, DO NOT SIMPLY DRILL A HOLE
AND USE A COUPLE OF HANGING BOLTS.
For information, factory optional inlet cabinets can reduce cost and simplify installation, see previous
pages.
When installing the unit maintain a minimum clearance of 36” in front of the unit for service accessibility.
Upflow, Air Conditioning
As stated above, the return air should enter the bottom of this cabinet. Suggest using Electro bottom filter
cabinet (page 2) or field constructed equivalent. The A-coil will be mounted above the blower in either a
case coil or field constructed plenum.
Downflow, Air Conditioning
Similar to upflow above, the air conditioning coil is positioned at the blower outlet. Depending upon the
coil type and drip pan it is positioned in a field constructed plenum as required.
A typical packaged 20” x 20” filter cabinet could easily be installed at the blower inlet opening.
Horizontal, Air Conditioning
Similar to upflow above, the air conditioning coil is positioned at the blower outlet. Depending upon the
coil type and drip pan it is positioned in a field constructed plenum as required.
As horizontal, the return air would enter the blower end of the cabinet with a typical packaged 20” x 20”
filter cabinet.
Upflow, Make-Up Air
The non-tempered air should enter the bottom of this cabinet. An appropriate inlet damper, insulated inlet
ducting and high quality (washable or moisture tolerant) filter are required.,
Downflow, Make-Up Air
The non-tempered air should enter the top of the cabinet as the unit would be flipped 180°. An
appropriate inlet damper, insulated inlet ducting and high quality (washable or moisture tolerant) filter are
required.
A typical packaged 20” x 20” filter cabinet could easily be installed at the blower inlet opening.
Horizontal, Make-Up Air
As horizontal, the return air would enter the blower end of the cabinet with a typical packaged 20” x 20”
filter cabinet. An appropriate inlet damper, insulated inlet ducting and high quality (washable or moisture
tolerant) filter are required.
Blower Motor Orientation
If the installation is not upflow, the blower motor shall be positioned so the power and control connectors
are down. This will prevent water from entering the blower motor through the connector housing
opening.
Loosen motor mount clamp and rotate motor accordingly.
Before tightening motor mount clamp be sure the blower wheel is properly centered inside the blower
housing.

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Electrical Installation
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.
Line Voltage
The nameplate and/or Installation and Operating Manual specification page provides kW rating and
operating current requirements for each specific model. Select the proper wire size to comply with your
type of wire routing and NEC field wiring requirements.
Field connection is at this product’s furnished circuit breaker. This integrated circuit breaker is a proper
local disconnect.
WARNING
USE ONLY COPPER WIRE FOR CONNECTION TO THE CIRCUIT BREAKER TERMINALS AND
INSIDE THIS PRODUCT’S CABINET.
If the 240 power service is to be wired as single feed, order option circuit breaker single feed bus bar, part
number 5701.
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.
WarmFlo Controller – Inside View, Left Board
Remote Sensor
Duct sensor, A-coil not in supply plenum – the duct sensor (shorter cable, black wire on ST terminal) is
installed approximately 24” above (or airflow distance from element) the Electric Furnace or electric
elements. Drill a ½” hole, approximately plenum center.
If there is not adequate plenum distance, pick the largest distribution duct and install towards the top of
the horizontal duct. Locate, common sense, in the maximum warm air stream.
Duct sensor, A-coil in supply plenum – the duct sensor (shorter cable, black wire on ST terminal) is
installed on the warm side of the coil and 4” to 6” after the coil. If it is an A-coil, pick the side which
appears to have the most airflow distribution (facing A-coil) and drill a ½” hole approximately 2” from
the side edge.
Again the key is getting this sensor in the maximum warm air stream, the air coming through the A-coil
fins will all be on the edge of the plenum.
Note: The black tip inside of the white tube is the sensor itself. It must be positioned slightly
sticking out of the white tube. The only purpose of the white tube is physical protection, once it
is installed it is okay to push out the sensor ¼” to ½” to make it more sensitive and faster
responding to the warm air stream.

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The sensor has polarity, is sensitive to wrong voltage, must be protected from static voltage, etc. Do not
cross connect or inadvertently short out sensor wires with power on. Permanent destruct damage may
result.
Electric Furnace Control – Inside View, Right Board
There are several room thermostat and outdoor unit possibilities. Pick the following paragraph which
relates to your installation.
Room Thermostat, Air Conditioning
Use conventional heat/cool, 1H/1C, thermostat. It can be mechanical, digital, power robbing, battery
operated, setback, etc. If mechanical, set the heat anticipator to 0.2.
Connect the standard R, W, G, Y stat terminals to the control board HEAT/COOL terminal block with
the same letters.
Room Thermostat, 2-Speed Air Conditioning
Use conventional heat/cool, 2H/2C, thermostat. It can be mechanical, digital, power robbing, battery
operated, setback, etc. If mechanical, set the heat anticipator to 0.2.
Connect the R, W, G stat terminals to the control board HEAT/COOL terminal block with the same
letters.
Connect the Y1 stat terminal to the control board Y1 tab. Connect the Y2 stat terminal to the control
board Y/Y2 screw terminal.
The room thermostat W2 is not used or connected.
Outdoor Unit, Air Conditioning
Connect the outdoor unit 2 wires to the control board Y/Y2 and C. If 2-speed A/C, there will be a third
wire connected to the tab Y1.
Cooling, Special Dehumidification
The BK tab and the BK peg jumper provide the industry standard 12% blower speed reduction to “pull
out” additional moisture from the air. Provide an external humidistat between BK and R and pull or
permanently disconnect the BK jumper. With the BK terminal at 0 volts the 12% blower speed reduction
is activated.
Make-Up Air Hookup
In its simplest form, this unit turns on and off with a contact closure across R and Y (T3).
This “on and off” control contact applied across R and Y depends upon installation
requirements and can take on several possibilities – end switch within inlet damper, pressure
differential switch, current level detection switch, relay across exhaust blower motor, end
switch associated with exhaust damper/motor, etc. See Optional Control Devices.
Utility Load Control
If applicable for your installation and your utility authorized electric rate, at the bottom of the control
board is a blue wire jumper. Simply remove this jumper and extend the two tabs to the power company
receiver having N.C. logic.
If opposite control logic is required contact factory for other wiring instructions.

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Setup or Programming
It is extremely important the installer properly sets the peg jumpers for all of the following requirements.
WarmFlo Controller – Inside View, Left Board
Program Control Chip – AHS Chip Code
This unit is provided with a control chip (version 2.36 or higher) which can relate to non-heat pump, only
ST sensors installed. The key information is programmed within this “AHS” chip.
Warm Air Dial Settings
Lower right dial switch – min. warm air – The yellow dial switch sets the operating temperature.
0 = 100 4 = 116 Factory set on #3.
1 = 104 5 = 119
2 = 108 6 = 122
3 = 112 7 = 124
Program Control Chip – WFMU Chip Code
This unit is provided with a control chip (version 2.36 or higher) which can relate to make-up air, only ST
sensors installed. The key information is programmed within this “WFMU” chip.
Warm Air Dial Settings
Lower right dial switch – min. warm air – The yellow dial switch sets the operating temperature.
0 = 30 4 = 62 Factory set on #3.
1 = 38 5 = 80
2 = 46 6 = 88
3 = 54 7 = 96
Electric Furnace Control – Inside View, Right Board
Room Thermostat Type
On the control board left side is a peg jumper which, based on application, this jumper must be set
accordingly.
• Forced air space heating application (AHS): Set to conventional heat/cool.
• Make-Up Air application (WFMU): Set to “HP”
Heat Minimal Blower Speed Selection
On the right side is a peg jumper for a LO/MED/HI selection. As an ST sensor only model, this setting
must match the kW.
10 kW LO 765 CFM
15 kW MED 900 CFM
20 kW HI 1035 CFM
Cool Minimal Blower Speed Selection
At the control board right side is A/B/C/D selection. It is very important that this selection be matched to
the cooling ton installed within the system. This is independent of the heating as outlined and setup
above.
A – 3-3.5 ton 1200 CFM
B – 2.5-3 ton 1100 CFM
C – 2-2.5 ton 1000 CFM
D – 2 ton 900 CFM
Note: “COOL” section is used in make-up air applications with default in A.

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Operation Indicators
WarmFlo Controller – Inside View, Left Board
Monitor LED’s on Front
Green LED
Illuminated when WarmFlo II is receiving 24V power. Under all normal operating modes, this should be
solid green.
As a secondary function this green LED provides status of the two remote sensors. If a
sensor is inoperative, incorrectly wired, or malfunctioning; this monitor light is in a blinking
or pulsing mode. By checking the pulsing pattern, the appropriate sensor can be identified.
ST sensor - two, 1ØØ ms blinks every second.
Amber LED
Illuminated when WarmFlo II is in the electric heat operating mode (Utility Load Control).
Inside WarmFlo Board, Red LED’s
The four red LED’s next to the output connector indicate Stage 1, 2, 3, and 4 operation (stage 1 is on the
top).
Electric Furnace Control – Inside View, Right Board
Green, next to Fuse
24-volt power connected and fuse good.
Red, next to W
Call for electric heat, represents the input signal (yellow wire) to the WarmFlo control board.
Green, Cool
Conventional H/C stat has an active Y function or heat pump stat reversing valve is in the cool mode (will
depend upon proper setup with RV logic jumper). For 2-speed AC this LED is illuminating during high
speed.
Amber
Represents action within ECM™ blower motor. Factory technician troubleshooting only.

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Additional Information
WarmFlo Elements Mechanical Hi-Limit
For this unit there is no LED’s representing mechanical, automatic reset, hi-limit.
ECM™ Blower Motor
The “setup or programming” section outlined the peg jumper programming for selecting blower motor
speed according to the nominal or low volume heat and cool installed tons.
Room Thermostat “Fan On” Mode
This sets up continuous air at 50% of the pin jumper selected cool. The ECM™ motor is very economical
at this speed.
Handheld Analyzer/Laptop Software
This test tool and/or software is available for temperature offset, field altering the program chip
parameters and setup, and general assistance for troubleshooting.
Note: This unit is designed to operate in a total electric application. Therefore, SOT-S and MU are not
permitted and should always remain disabled.
Troubleshooting
CFM CALCULATION – By measuring the temperature rise across the Electro-Mate, the actual CFM
can be quite accurately determined. The airflow and Electro-Mate unit must be operating in a stable
condition for at least 10 minutes. If it is cycling on temperature limit, this calculation will be of no value.
The accuracy of this formula will depend upon uniform and average temperature rise plenum
thermometer readings and the accuracy of both the clamp-on amp meter and AC voltmeter. NOTE: The
volts x amps x 3.4 value is the same as Btuh output.
CFM = Volts x Amps x 3.4
Temperature Rise x 1.08
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 can be calibrated with ice (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 green LED “blinks” at you, release and now the outdoor sensor is set at 32°F.
Caution: This is not a temperature checking situation. If you proceed with this function, the
sensor automatically goes to 32°F.
2. Use WarmFlo II Analyzer test set or purchase special PC software disc and PC serial port cable.
These plug-in devices allow direct readout of both temperatures, allows a visual determination of
WarmFlo II internal temperature settings, and can be used to offset either temperature sensor for
troubleshooting and demonstration purposes. This is especially valuable during summer
installation. Call factory and order test set device.
Comment: Also see the “WarmFlo Information” document (HD320) included with this manual.
Troubleshooting/Repair Helps
1. This WarmFlo II controller contains several interference suppression components, but as an electronic
logic product, unpredictable and unusual transients or interferences may sometimes cause strange results.
If the WarmFlo II controller is “acting strange”, one immediate step would be power down reset. Simply

02/04/2014 14 NI804
turn off the 24-volt source power (probably furnace or Electric Furnace circuit breaker), when the green
LED goes out, count to 10, and re-energize power supply.
2. 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.
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.
4. Acquiring the WarmFlo II Analyzer test set or the PC software and serial port hook-up cable (see
previous page) is a positive tool for understanding and troubleshooting the WarmFlo II controller.
Either test set device can display all temperatures, real time evaluation of WarmFlo II functions,
provide temperature offsets for assimilating winter conditions, and reprogram the control chip
(program stays with the actual controller board).
Bad sensor, safety – if the internal logic detects open sensor wire, incorrectly wired sensor, or some bad
sensor transmitted value conditions; the green LED reverts to a pulsing mode. Basically the appropriate
sensor is set internally to a 0° value and the WarmFlo main board only allows stage 1 and stage 2 on.
-ST sensor – two, 1/10 second blips every ½ second
Analyzer readout, sensor temperature constant 32° or 0° – these two values represent digital bit
patterns that are hard to predict an error function. A blinking green light may or may not be experienced.
Typically the cable is too long, wrong type of sensor wire, or some electrical interference on the sensor
cable.
24-Volt Fuse – the internal fuse is between the Electric Furnace transformer and all other WarmFlo II
functions, including the “R” going to the outdoor unit. Use only two amp, fast blow.

02/04/2014 15 NI804
Replacement Parts
@WFS55612 Sensor ST filter 5 ft.
@WFS255612 Sensor 25 ft. filter
@WFCOE5615 PCB WF2 PIC 74 Dual Heat
@HEIBG6707 PCB Electric Furnace ECM™ Motor H/C and HP Stat
@WFPDC5632 PCB Power Sup AC to DC
5850 Motor ½ HP ECM™ GE
5541 Transformer 120/240:24 40VA
4038 Triac SSR 50-amp 24VDC
5127 Relay NO 25A@277 24VDC Coil
6630 Limit O-150/O-180 25A@240V ST-CLSD
5636 Limit O-135/C-120 25A@240V DP-CLSD
6615 Element DI 4800W@240V
5652 Circuit Breaker SD 60A
5650 Circuit Breaker SD 30A
5651 Circuit Breaker SD 45A

E L E C T R O I N D U S T R I E S , I N C .
M ON T I C E LL O , M N 55362
W A R M F L O ( S T ) , H E A T / C OO L S T A T , A / C ( 1 SPEE D )
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L U G S E T # 5701 .
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E L E C T R O I N D U S T R I E S , I N C .
M ON T I C E LL O , M N 55362
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