Electro Industries WF-EM3 User manual

11/01/2007 HI320
WARMFLO II
Dual Heat System
Controller Portion of Electro-Mate
WarmFlo Electro-Mate EM-WU*****/EM-WD***** mechanical
information – companion manual EI703/EI707.
Special applications and conditions, see page 23.
When used as a dual heat (backup gas or oil furnace) application, the system
must also include Electro Industries’ furnace interface module (sometimes
called fossil fuel kit).
Use the appropriate colored section for the appropriate furnace interface.
WF-EM3 – non-heat pump, standard A/C Yellow
WF-EZ3 – single speed HP, 4-wire, standard roomstat Green
WF-LGR3 – heat pump manufacturer’s multi-wire stat Blue
(product discontinued)
Note: For 2-speed heat pump, use WF-HP2 (information not contained
in this manual)
Note: The WF-LGR3 is no longer in production, use WF-LGR4 which
has its own installation manual. In other words, this manual is now only
used for conventional, 4-wire, room thermostat application.
Also accompanying each system is a specific control program “chip”. This is typically part of
ordering information and should be listed on packing slip. A listing of these “chip codes” is in the
controller setup or programming sections of this document.
®

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TABLE OF CONTENTS PAGE
INTRODUCTION 1
INSTALLATION REQUIREMENTS 1
MECHANICAL INSTALLATION 2
WF Furnace Interface 2
EM-WU***** Upflow Application 2
EM-WU*****/EM-WD***** Horizontal Application 2
EM-WD***** Downflow Application 3
WIRINGINSTALLATION 4
HighVoltage 4
LowVoltage 4
Outdoor Sensor (OT) 4
Supply Sensor (ST) 4
WF-EM3 & WF II Wiring & Setup 6
Chip Code:
EMW 7
EMR 8
EMA 9
WF-EZ3 & WF II Wiring & Setup 10
Chip Code:
HPDH 12
HPDF 13
HPEL 14
WF-LGR3 & WF II Wiring & Setup 15
Chip Code:
HPDH 17
HPDF 18
HPEL 19
OPERATION INDICATORS 21
Furnace Interface Module 21
WarmFlo II Controller 21
HANDHELD ANALYZER/LAPTOP SOFTWARE 23
SPECIAL APPLICATION/INSTALLATION 24
For Various Heat Pump, Multi-Speed, Multi-Stage Furnaces, Blower Options, Oil Furnace, etc.
OPTIONAL ACCESSORIES 25
TROUBLESHOOTING 26
OPERATIONAL INFORMATION 27
Drawings Included: HH318, 329, 316
HD320

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INTRODUCTION
Prior to installation we recommend that the installer verify the product intended application is
applicable to your current installation needs. The system application for this model combination is dual
heat, gas or oil furnace as standby, and may include heat pump. If your application does not include dual
heat with standby furnace, but electric heat with an air handler, do not use this WarmFlo II series or this
installation manual. Contact factory for other models (EM-WE series, WF-DH*** kits, etc.).
EM-WU***** – WarmFlo Electro-Mate ranging from 10 kW to 25 kW. Can be installed in upflow
applications only.
EM-WD***** – WarmFlo Electro-Mate ranging from 10 kW to 25 kW. Can be installed in downflow
and horizontal applications.
Caution, Heat Pump Application: Depending upon mechanical positioning and airflow, in all
cases (heat pump) the electric element, Electro-Mate, unit must be on the supply or warm side of
the HP refrigerant coil.
First-time or non-routine user – before attempting installation or setup, suggest studying the last section
of this manual, operational information and terminology definitions. Also if you have not attended a
WarmFlo training session, the document HC321, Application Flowchart, may be of assistance.
In order to verify you have all the components necessary to complete your installation we recommend
you verify that you have both the EM-WU*****/EM-WD***** Electro-Mate heater and the correct
WarmFlo Furnace Interface (I/F) for your application. Heat pump manufacturer’s fossil fuel kit is not
used with WF II.
WarmFlo Furnace Interface (I/F) – All dual fuel installations require a furnace interface (I/F) module,
which is typically a second line item on the order sheet. Depending upon overall system configuration
one of the following furnace interface modules is required and covered by this product manual.
-WF-LGR3 – HP manufacturer’s multi-wire room thermostat – heat pump, EM-WU, EM-
WD, gas/oil combination.
-WF-EZ3 – standard 4-wire thermostat – heat pump, EM-WU, EM-WD, gas/oil system.
-WF-EM3 – standard 4-wire non-heat pump, with or without standard air conditioning.
**Installation Notice - Upon installation it is necessary that all the components of the heating system are
in place and functional. This controller is designed to operate the complete heating system - heat pump,
backup furnace (gas or oil), Electro-Mate, room thermostat, WF outdoor sensor, etc. If one of these
components is missing or not initially installed, improper performance of WarmFlo II and the system may
be experienced. In other words, if the gas furnace doesn’t exist, LP tank not yet installed or filled, and the
WarmFlo II is operating on a cold day; do not be disappointed if there is no heat.
Warranty/Checkout – Attached to this manual is a warranty certification and checkout procedure. This
must be completed and returned for warranty coverage.
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.
2. All electrical wiring must be in accordance with National Electric Code and local electric codes,
ordinances, and regulations.
3. Observe electric polarity and wiring colors. Failure to observe could cause electric shock and/or
damage to the equipment.
4. 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

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practices not according to the details of this manual will void the product warranty, the ARL
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.
5. The only approved installation for this Electro-Mate series is upflow and horizontal furnace and
above or downstream from the air conditioning or heat pump A-coil. Any other configuration or
furnace plenum/ducting installation voids warranty and manufacturers product liability.
MECHANICAL INSTALLATION
WF Furnace Interface I/F (WF-EZ3, WF-LGR3, WF-EM3)
The mounting location of this enclosure is flexible to any convenient location were the thermostat
connection is easily accessible. The distance between the I/F and WF II is limited only by the 4’ cable
provided with the I/F.
The housing has also been arranged for easy attachment directly to the right side of the Electro-Mate
cabinet. Depending upon furnace surroundings, you can explore mounting this interface enclosure
directly to the Electro-Mate, right cabinet end.
EM-WU***** Electro-Mate Upflow Application
Electro-Mate nameplate or companion installation manual EI703 is required for correct mechanical
installation. If you do not have manual #EI703 do not attempt to do the mechanical installation, contact
the factory for a replacement manual. The primary installation concerns focusing on the existing furnace
and ducting system’s airflow capacity and necessary plenum baffling required by the specific Electro-
Mate for correct installation. It is true that the WarmFlo II modulating control and the supply sensor
adjust the electric heat or element capacity based upon temperature. But if you do not have the required
CFM airflow (example 20 kW, 1400 CFM), you could have a situation where you cannot heat the house.
Another even more serious situation (because of improper airflow) is when all stages are on at colder
temperatures and the unit is cycling on mechanical safety hi-limit. When cycling on the hi-limit probe,
the WarmFlo II supply sensor basically gets confused because at one point it is way up in temperature and
then the elements simply disappear and it dips down, the net result probably is switching over to standby
at premature intervals. There is no substitute for adequate airflow capacity and plenum baffling.
EM-WD***** Electro-Mate Horizontal Application
NOTE: It is not permissible to rotate the WarmFlo Electro-Mate 180°. These instructions apply to only
rotating the Electro-Mate unit 90°.
With WarmFlo, IT IS permissible (and authorized by the manufacturer) to turn the Electro-Mate unit 90°
for horizontal application. However, you must follow the instructions below relating to temperature
sensor positioning, etc.
The reason this practice is acceptable is because the element power and temperature is controllable by the
WarmFlo sensor. When placing the sensor at the top of the duct as stated below, heat rise will keep the
elements off even without the blower.
Installation steps
•Ideally, the WF II Electro-Mate should be inserted on an appropriate duct side so that the circuit
breakers are at the bottom.
•Locate the WF II Electro-Mate as high as possible in the horizontal duct. At the top, the elements
should almost touch the top of the duct.
•If the vertical dimension of the horizontal duct is greater than the WF II Electro-Mate element
area, baffle at the bottom.
•If the horizontal duct is deeper than the electric elements, baffling at the back is required.
•Locate and install the WarmFlo duct sensor approximately 4” down from the duct top and 12”
away from the Electro-Mate elements.
•Checkout and operation should be identical to standard WarmFlo system.

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EM-WD***** Electro-Mate Downflow Application
Electro-Mate nameplate or companion installation manual EI707 is required for correct mechanical
installation. If you do not have manual #EI707 do not attempt to do the mechanical installation, contact
the factory for a replacement manual. The primary installation concerns focusing on the existing furnace
and ducting system’s airflow capacity and necessary plenum baffling required by the specific Electro-
Mate for correct installation. It is true that the WarmFlo II modulating control and the supply sensor
adjust the electric heat or element capacity based upon temperature. But if you do not have the required
CFM airflow (example 20 kW, 1400 CFM), you could have a situation where you cannot heat the house.
Another even more serious situation (because of improper airflow) is when all stages are on at colder
temperatures and the unit is cycling on mechanical safety hi-limit. When cycling on the hi-limit probe,
the WarmFlo II supply sensor basically gets confused because at one point it is way up in temperature and
then the elements simply disappear and it dips down, the net result probably is switching over to standby
at premature intervals. There is no substitute for adequate airflow capacity and plenum baffling.
Generally, a base adapter or raised plenum is required for installation of this DOWNFLOW Electro-Mate.
The instructions in manual EI707 for the field design and fabrication of this base adapter must be
followed in detail.

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WIRING INSTALLATION
High Voltage
Please reference manual EI707 pages 2 and 3.
Low Voltage
WarmFlo II Sensors
Located within each WarmFlo control are two sensing probes, OT (outdoor sensing) and ST (supply
sensing) necessary for proper operation and installation of the WarmFlo systems. Without proper
installation of these probes the WarmFlo system will not operate correctly.
Note : With WF-EMA chip the outdoor sensor(OT) is not required. Installation is optional. If at
some later date this system is converted to heat pump or another chip code, the sensor would be
available for use at that time.
Outdoor Sensor (OT) is identified by the longer cable and the metal mounting bracket.
1. Determine best location for the OT sensor using the following ground rules.
a. Locate on the outside of the house to sample outside temperature least affected by sun.
b. Locate sensor away from other objects that produce a heat or cool effect such as heat
pump freon line sets, drier vents, direct sunlight, steel siding, or other miscellaneous
objects that affect the air temperature.
c. Do not install sensor in an enclosure which may have a “heat build up” or insulation
effect.
2. Disconnect OT and ST sensor cable from Warmflo Controller noting the screw locations for
future re-hookup.
3. The factory supplied OT cable is approximately 25’. Determine necessary length of cable to
route to the predetermined outside location. If the sensor wire cable is too short, you must use
the following rules for extending the cable.
a. Use unshielded (low capacitance, prefer twisted) 3 or 4 wire low voltage cable, 35 foot
maximum.
b. Do not under any circumstances use leftover wires within the thermostat cable going to
the outdoor unit.
4. Mount OT sensor with sensor tip up (cable downward)
5. Drill ¼” hole near the outside sensor location. Routing the cable along the freon tubing often
makes the easiest installation.
6. Route wire from outside making sure not to crimp, cut, staple, or damage cable in any way.
7. Keep the sensor cables at least 12” away from any line voltage wiring, Romex, etc. Do not,
under any circumstances, use part of existing thermostat cable, leftover wires, for the sensor
cable.
8. Do not reconnect sensor wires to the 4-screw terminal block until both sensors are properly
installed.
Warm Air Supply Sensor (ST)
1. Determine best location for ST sensor using the sketches below (horizontal is on previous page).
2. Locate directly above Electro-Mate element, preferably left side for upflow models. Locate
directly below Electro-Mate element, preferably left side for downflow models. If you do not
have the 12” height, locate in the major distribution duct, but as close as possible to the plenum
and so there is a direct airflow path from the electric element to the sensor.
3. Drill ½” hole in the hot air distribution duct about 14 to 18 airflow inches away from the Electro-
Mate element.
4. Prior to inserting ST white tube verify tip position
Note: The black tip inside of the white tube is the temperature 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 ½”to
make it more sensitive and faster responding.
5. Mount ST white tube using two mounting holes.

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OT & ST Sensor Reconnection
1. A plug-in terminal block is provided for wiring convenience.
2. Both red wires are terminated in the same single screw (+), and both white or green wires are
terminated in the single common screw (COM). Each appropriate black wire is terminated in the
appropriate OT and ST screw.
WARNING - If the black and red sensor wires are crossed or incorrectly installed at the terminal
block and power is turned on, burnout damage can result within the sensor probe
ELECTRO-MATE
Dist.
Duct
Dist.
Duct
Furnace
Downflow Only
EI708-03
Rev.C 04-27-04
DUCT
SENSOR (ST)
Hi-limit sensor tube
located below
element in heated
14"-18"
1.0" MIN.
Spacing between
bottom of A-coil and
top of Electro-Mate
A-Coil

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WF-EM3 & WF II WIRING & SETUP
WF-EM3
Application – non-heat pump, standard Electro-Mate/fossil fuel furnace/with or without air conditioning.
Reference Drawing HH318
1. Attached to the WF-EM3 is a 4’ cable harness that interfaces between the WF II and the WF-EM3.
Note: Units produced after 08-04-04 (ARL #3074 and up) have an updated control board. This
update increases the size of the interface header from a four place to a ten place. See photo below
for proper cable installation.
2. Requirements:
a. Thermostat connection One 4-wire cable
b. Fan Center/Gas furnace connection One 4-wire cable
40VA or larger transformer
Blower connection “G” relay
c. Outdoor Heat Pump One 2-wire cable
3. Room Thermostat Connections – Install room thermostat at the desired room location and route the
typical four wires (red, white, green, and yellow) to the WF-EM3 upper left “stat” terminal block.
Note: If this is a mechanical stat, adjustment of the heat anticipator is required, set the heat
anticipator to 0.2.
4. Fan Center Connections – Route a 4-wire cable from the I/F module, bottom center terminal block
“fan center”, to furnace fan center, same letter designated connections (R,W,G,C).
5. If air conditioning is part of your installation simply route one 2-wire cable from the upper right
terminal block Y and C to the compressor relay Y and C.
6. Within the WF-EM3 is a wire harness that goes from WF-EM3 to the WF II controller. Within this
WF-EM3 wire harness are two blue wires. Undo these, extend and connect to the utility load control
receiver. For electric energy operation (off-peak) the two blue wires represent contact closure as
shipped. Do not apply external voltage or external power to the blue wires, they are simply
looking for a closed contact during off-peak.
-Optional – where load management interrupt does not apply, simply leave the blue wires tied
together and wire nut.
-If load control reverse logic is required, keep the two blue wires shorted and connect load
control switch between X1 and R.
WarmFlo II Controller Connection
1. Sensor connection – see page 4 “WarmFlo II Sensors”.
2. WF II controller is located on the cabinet right side door.
3. Plug the 4-wire pigtail from WF-EM3 into the left center connector. Do not force on the
connector, the connector only plugs in one way and should slide on easily.
4. Plug the yellow wire and connect to the WarmFlo II “Y” tab located on the top left portion of
WF controller.

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Information - The WarmFlo II controller receives its operating power through the plug-in
wire harness. The yellow wire is simply the thermostat “call for heat” signal being
forwarded to the WarmFlo II controller.
5. The harness also comes with a violet wire, do not use, tie off and do not plug into WF II board.
6. The cable has a 7th wire (brn/yel) which is simply an extra wire for special stat field hookups,
simply tie off.
7. Caution – 24 volts common grounding – the installer must determine whether the furnace fan
center COM screw terminal has a good ground bond (not simply furnace skin). If the fan center
COM is not adequately grounded, use the pigtail green wire (WarmFlo board, upper, C tab) for a
ground bond to the Electro-Mate cabinet power source ground lug. The upper right circuit board
mounting screw is a static ground protection point.
If your installation has special application and hookup conditions please see section located in
this manual called “Special Application/Installation Instructions”.
WARMFLO II CONTROLLER SETUP OR PROGRAMMING
Important - Located on the WF II board is a firmware chip that determines a specific set of defaults (see
table below). However, this can be programmed (altered) with optional PC software (ET-SOFT-WF) or a
plug-in WarmFlo analyzer (WF-ANZ*). As part of the WF II system this chip represents critical defaults
and settings that can make your system operate correctly. It is a critical portion of the installation to
verify that the chip code sent with your WF II is correct for your intended application. The chip code is
located on a white label in the center of the WF II controller.
The table below represents the typical WF II chip codes and defaults for use with a WF-EM3. Please use
this table as a reference as you setup your WF II. See Operational Information and last section of this
manual for further information on these defaults.
Chip Code Reference Table
Code Stg. Enable MU Time ODT Mode OT Function
EMW 90°, 50°, 36°, 34° 90 EL to SB DT cal.
EMR 90°, 50°, 30°, 20° 00 EL to SB DT flat
EMA - 00 - Disable
MU Time - Standby or Gas Furnace Operation - Whenever all four stages are full on (if it is not a 4-
stage Electro-Mate, this simply means full Electro-Mate output), and operating at a continuous 100% for
a fixed delay (see Chip Code Reference Table, MU Time); the WarmFlo II controller automatically
terminates all electric and starts the gas furnace. The gas furnace will be used to complete the heating
cycle until room thermostat heat call ends. During the next heat call, the Electro-Mate stages again
attempt to produce the WarmFlo II desired temperature. Again, if everything is at 100% plus the MU
time, the gas furnace takes over.
EMW Chip Code
Electro-Mate, Non-Heat Pump, using EMW type program chip code – The outdoor sensor is used as
a staging disable function. With a call for heat, the desired temperature (DT) attempts to rise to “cal DT”
(WarmFlo calculated desired temperature). With this chip code the stages operating are limitied by the
enable temperature reflected below.
Stage 1 = 90°F Stage 2 = 50°F Stage 3 = 36°F Stage 4 = 34°F
MU – Set at 90 minutes

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WF II DIAL SETTINGS
Lower right dial switch – min. warm air – The lower inside yellow screwdriver adjustment dial sets a
“floor” or level minimum operating temperature. The supply temperature will never go below this point
independent of outdoor temperature. In other words, this is the flat horizontal line on the warm air versus
outdoor temperature curve referenced in this manual “Heat Loss Curve” graph.
0 = 90 4 = 98 Factory set on #5.
1 = 92 5 = 100
2 = 94 6 = 102
3 = 96 7 = 104
Upper right dial switch – built-in ODT or Low Temperature Switch-Over – The “ODT” yellow
screwdriver adjustment dial can be set to terminate the Electro-Mate for low outdoor temp. gas/oil
operation. For outside temperatures below this set value, the gas furnace is used for all heat call cycles
and requirements. Comment: Typically this is used for undersized Electro-Mate.
The temperature settings related to the “ODT dial” are:
Ø = Disabled, no ODT switch-over Factory set on #0.
1 = -15°F 5 = 10°F
2 = -10°F 6 = 20°F
3 = 0°F 7 = 30°F
4 = 5°F
Front control red dial - Temperature (Efficiency Dial) – Located on the front door of the main WF II
cabinet. The small red adjustment screw is active and needs to be set. Verify the outdoor sensor (OT) is
installed. These A through G selections represent a supply temperature point at 0° outdoor. The closer
the user or installer selection is to A, the flatter the heat loss curve and the lesser the operating electric.
The closer a selected setting is to G, the steeper the heat loss curve and more operating electric.
Reference WarmFlo Operation Information section on heat loss curve for further information. Setting the
dial to full electric will bring on all stages of electric at full capacity.
Reference “WarmFlo Handheld Analyzer/Laptop Software” section in this manual for changes to your
chip functions.
EMR Chip Code
Electro-Mate, Non-Heat Pump, using EMR type program chip code – The outdoor sensor is used as a
staging disable function. With a call for heat the desire temperature attempts to rise to “flat DT” (desired
temperature). With this chip code the number of stages is limited by the enable temperature reflected
below.
Stage 1 = 90°F Stage 2 = 50°F Stage 3 = 30°F Stage 4 = 20°F
MU Time – 00 (disabled)
WF II DIAL SETTINGS
Lower right dial switch – min. warm air – this inside screwdriver adjustment dial is not used with this
chip code. Leave dial at factory setting.
Upper right dial switch – built-in ODT or Low Temperature Switch-Over – The “ODT” screwdriver
adjustment dial can be set to terminate the Electro-Mate for low outdoor temp. gas/oil operation. For
outside temperatures below this set value, the gas furnace is used for all heat call cycles and requirements.
Comment: Typically this is used for undersized Electro-Mate.
The temperature settings related to the “ODT dial” are:

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Ø = Disabled, no ODT switch-over Factory set on #0 = disabled.
1 = -15°F 5 = 10°F
2 = -10°F 6 = 20°F
3 = 0°F 7 = 30°F
4 = 5°F
Front control red dial - Temperature (Efficiency Dial) – Located on the front door of the main WF II
cabinet. The small red adjustment screw is not active and not part of this option. Install the white loose
decal located in the manual envelope over the small red adjustment dial on the front of the WF II.
Reference “WarmFlo Handheld Analyzer/Laptop Software” section in this manual for changes to your
chip functions.
EMA Chip Code
Electro-Mate, Non-Heat Pump, using EMA type program chip code – Since this chip is a Electro-
Mate concept with fixed output temperature there is no temperature enable/disable - follow special
instructions accompanying this program chip for supply temperature.
MU Time – 00 (disabled)
WF II DIAL SETTINGS
Lower right dial switch – This yellow screwdriver dial is the adjustment for the operating supply
temperature. The dial switch settings for fixed output temperature are:
0 = 100 4 = 116 Factory set on #5.
1 = 104 5 = 120
2 = 108 6 = 124
3 = 112 7 = 128
Comments:
-When setting this dial remember this temperature must be capable of heating the whole
house on the coldest days.
-There is no automatic override to gas based on thermostat call, etc.
-If there is not adequate air flow and system is cycling on hi-limit, system will not be able to
function properly and maintain fixed outlet temperature.
Upper right dial switch – built-in ODT or Low Temperature Switch-Over – Located on the top right
of inside WF II board the “ODT” screwdriver adjustment dial should be set at “0”. This is not used on an
EMA chip.
Front control red dial - Temperature (Efficiency Dial) – Located on the front door of the main WF II
cabinet. The small red adjustment screw is not active and not part of this option.
Install the black loose decal (UAI006) located in the manual envelope over the small red adjustment dial
on the front of the WF II.
Reference “WarmFlo Handheld Analyzer/Laptop Software” section in this manual for changes to your
chip functions.
Furnace Interface Necessary Adjustments
No adjustments are necessary. The normal/standby switch provides the standard user override function
(some power companies request inactivation or deletion of this switch).

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WF-EZ3 & WF II WIRING & SETUP
WF-EZ3
Application – 4-wire thermostat, heat pump, WF II Electro-Mate/fossil fuel furnace. HP manufacturer’s
fossil fuel kit not required.
Reference Drawing HH317
1. Attached to the WF-EZ3 is a 4’ cable harness that interfaces between the WF II and the WF-EZ3.
Note: Units produced after 08-04-04 (ARL #3074 and up) have an updated control board. This
update increases the size of the interface header from a four place to a ten place. See photo below
for proper cable installation.
2. Requirements
a. Thermostat connection One 4-wire cable
b. Fan Center/Gas furnace connection One 5-wire cable
40VA or larger transformer
Blower connection “G” relay
c. Outdoor Heat Pump One 4-wire cable
3. Room Thermostat Connections - Install room thermostat at the desired room location and route the
typical four wires (red, white, green, and yellow) to the WF-EZ3 upper left “stat” terminal block.
Note: When using this WF-EZ3 module, use only a standard single stage heat/cool subbase
room thermostat. The heat pump multi-wire stat will not work correctly with an WF-EZ3.
If this is a mechanical stat, adjustment of the heat anticipator is required, set the heat
anticipator to 0.2.
4. Fan Center Connections – Route a 5-wire cable from the WF-EZ3 module, bottom center terminal
block “fan center”, to furnace fan center, same letter designated connections (R,W,G,C). The 5th wire
may be required for variable speed furnace “Y” terminal, see diagram in white section.
5. Within the WF-EZ3 is a wire harness that goes from WF-EZ3 to the WF II controller. Within this
wire harness are two blue wires. Undo these, extend and connect to the utility load control receiver.
For electric energy operation (off-peak) the two blue wires represent contact closure as shipped. Do
not apply external voltage or external power to the blue wires, they are simply looking for a
closed contact during off-peak.
Optional - Where load management interrupt does not apply, simply leave
the blue wires tied together.
If load control reverse logic is required, keep the two blue wires shorted and
connect load control switch between X1 and R.
6. HP Outdoor Unit Connections – Since the WarmFlo controller inherently knows defrost and has its
own methods for distinguishing heat or cooling mode, only four basic electrical connections are
required to the outdoor unit. The upper right terminal block and reference drawing show basic heat
pump terminology for these four wires. Depending upon heat pump manufacturer, the letters or wire
colors shown may have slightly different terminology. If additional terminology interpretation is
required, consider the following definition.
•R - 24 volt hot, same as furnace fan center “R” (except for fuse).

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•Y - The HP compressor relay coil, when the Y terminal goes to 24-volt, the compressor
and its internal functions should be on.
•RV - Reversing valve, determines outdoor unit heat or cool mode. See below for logic
selection. This may also be called “0”.
•C – 24-volt system common, same as furnace fan center.
7. Heat Pump Reversing Valve Logic - Depending upon the heat pump manufacturer, the “RV” may
be different logic for heating and cooling. This is selectable on the WF-EZ3 circuit board, top.
•Heating – RV = 24-volt, high – jumper header between center pin and H.
•Cooling – RV = 24 volt, high – jumper header between center pin and C.
Factory set at 24 volt = Cooling
WarmFlo II Controller Connection
1. Sensor connection – see page 4 “WarmFlo II Sensors”.
2. WF II Controller is located on the cabinet right side door.
3. Plug the 4-wire pigtail from WF-EZ3 into the left center connector. Do not force on the connector,
the connector only plugs in one way and should slide on easily.
4. Plug the yellow wire and connect to the WarmFlo II “Y” tab located on the top left portion of WF
controller.
Information - The WarmFlo II controller receives its operating power
through the plug-in wire harness. The yellow wire is simply the thermostat
“call for heat” signal being forwarded to the WarmFlo II controller.
5. The harness also comes with a violet wire, the violet wire is used as a “built-in” ODT for heat pump
compressor shut-off function. Connect the violet wire to the WarmFlo II tab “HP ODT” or T4 (this
wire must be connected).
6. The cable has a 7th wire (brn/yel) which is simply an extra wire for special stat field hookups and
options. Reference “Special Applications/Installation Instructions” part of this manual.
7. Caution – 24 volts common grounding – the installer must determine whether the furnace fan center
COM screw terminal has a good ground bond (not simply furnace skin). If the fan center COM is not
adequately grounded, use the pigtail green wire (WarmFlo board, upper, C tab) for a ground bond to
the Electro-Mate cabinet power source ground lug. The upper right circuit board mounting screw is a
static ground protection point.
If your installation has special application and hookup conditions please see section located in
this manual called “Special Application/Installation instructions”
CONTROLLER SETUP OR PROGRAMMING
Important - Located on the WF II board is a firmware chip that determines a specific set of defaults (see
table below). However, this can be programmed (altered) with optional PC software (ET-SOFT-WF) or a
plug-in WarmFlo analyzer (WF-ANZ*). As part of the WF II system this chip represents critical defaults
and settings that make your system operate correctly. It is a critical portion of the installation to verify
that the chip code sent with your WF II is correct for your intended application. The chip code is located
on a white label in the center of the WF II controller.
The table below represents the typical WF II chip codes and defaults for use with a WF-EZ3. Please use
this table as a reference as you setup your WF II. See Operational Information and last section of this
manual for further information on these defaults.
Chip Code Reference Table
Code Stg. Enable MU Time ODT Mode OT Function
HPDH 50°, 38°, 36°, 34° 90 HP W/STEP DT cal.
HPDF 50°, 38°, 36°, 34° 30 EL to SB DT cal.
HPEL 50°, 38°, 36°, 34° 00 HP DT cal.

11/01/2007 12 HI320
MU Time – Standby or Gas Furnace Operation - Whenever all four stages are full on, and operating at
a continuous 100% for a fixed delay (see Chip Code Reference Table, MU Time); the WarmFlo II
controller automatically terminates all electric and starts the gas furnace. The gas furnace will be used to
complete the heating cycle until room thermostat heat call ends.
During the next heat call, the heat pump and Electro-Mate stages again attempt to produce the WarmFlo
II desired temperature. Again, if everything is at 100% plus the MU time, the gas furnace takes over.
HPDH Chip Code – Electro-Mate Sized for Complete Heating Load
Application: 4-wire Thermostat, WF II Electro-Mate, Heat Pump, gas/oil furnace using ODT to
control heat pump only – The WarmFlo II controller with this chip has outside temperature reference for
enabling the electric heat staging (except “E” tab). The outside temperature (actual sensor) must be below
these values before the stage will come on, independent of supply sensor requirement.
Stage 1 = 5Ø°F 2 = 38°F 3 = 36°F 4 = 34°F
MU Time – Set at 90 minutes
WF II DIAL SETTINGS
Lower right dial switch – min. warm air – The lower inside yellow screwdriver adjustment dial sets a
“floor” or level minimum operating temperature. The supply temperature will never go below this point
independent of outdoor temperature. In other words, this is the flat horizontal line on the warm air versus
outdoor temperature curve. Reference manual “heat loss curve graph”.
0 = 90 4 = 98 Factory set on #3.
1 = 92 5 = 100
2 = 94 6 = 102
3 = 96 7 = 104
Top right dial switch - Built-in ODT or Low Temperature Switch-Over – The top inside yellow
screwdriver adjustment dial can be set to terminate the heat pump. Special programming can terminate
heat pump and electric to allow total gas operation below ODT temp. (reference manual WF-ANZ*) .
In addition this defaults as “HP W/STEP”. This means below the ODT selected temperature, the Electro-
Mate output goes to “Flat DT” (see last page definition).
The temperature settings related to the “ODT dial” are:
Ø = Disabled, no ODT switch-over Factory set on #3.
1 = -15°F 5 = 10°F
2 = -10°F 6 = 20°F
3 = 0°F 7 = 30°F
4 = 5°F
COMMENT: If you are using outdoor compressor built-in ODT, set the dial to “0”. At no time
can the outdoor compressor built-in ODT and WF II ODT setting (other than 0 = disable) be used
at the same time.
Temperature (Efficiency Dial) – Located on the front cover of the WF II Electro-Mate, the red center
screwdriver adjustment dial has a selection of A through G. These A through G selections represent a
supply temperature point at 0° outdoor. The closer the user or installer selection is to A, the flatter the
heat loss curve or the higher the operating efficiency. The closer a selected setting is to G, the steeper the
heat loss curve or the lower overall heat pump system efficiency. If knob is turned to “full” the WF II
will automatically go to “DT flat”.

11/01/2007 13 HI320
WF-EZ3 adjustments and settings – only one setting, selection of the reversing valve logic. See page
10, paragraph 7. The normal/standby switch provides the standard user override function (some power
companies may request deactivation or deletion of this switch, call factory).
Reference “WarmFlo Handheld Analyzer/Laptop Software” section in this manual for changes to your
chip functions.
HPDF Chip Code – Electro-Mate Undersized
Application: 4-wire Thermostat, WF II Electro-Mate, Heat Pump, and gas/oil furnace using ODT
setting as full electric control – The WarmFlo II controller with this chip has outside temperature
reference for enabling the electric heat staging (except “E” tab). The outside temperature (actual sensor)
must be below these values before the stage will come on, independent of supply sensor requirement.
Stage 1 = 5Ø°F 2 = 38°F 3 = 36°F 4 = 34°F
Electro-Mate or strip heat undersizing – there are provisions within WarmFlo and within Electro’s
various heating products to add partial resistance heating section to heat pumps. To provide optimum
operation and comfort, the setup functions need to be activated accordingly. Default program code chip
“HPDF” has been designed for this application. As a field setup, you probably want MU to be relatively
short (30 minutes), the ODT mode will be “EL to SB” with a dial switch temperature selection at about
the combination heat pump and Electro-Mate output energy (probably 0°) or position #3.
MU Time – Set at 30 minutes
WF II DIAL SETTINGS
Lower right dial switch – min. warm air – The yellow screwdriver adjustment dial sets a “floor” or
level minimum operating temperature. The supply temperature will never go below this point
independent of outdoor temperature. In other words, this is the flat horizontal line on the warm air versus
outdoor temperature curve. Reference manual “heat loss curve graph”.
0 = 90 4 = 98 Factory set on #3.
1 = 92 5 = 100
2 = 94 6 = 102
3 = 96 7 = 104
Top right dial switch - Built-in ODT or Low Temperature Switch-Over – The yellow screwdriver
adjustment dial can be set to terminate all electric to allow total gas operation below ODT temp.
(reference manual WF-ANZ* for special programming).
The temperature settings related to the “ODT dial” are:
Ø = Disabled, no ODT switch-over
1 = -15°F 5 = 10°F Factory set on #3.
2 = -10°F 6 = 20°F
3 = 0°F 7 = 30°F
4 = 5°F
This arrangement provides low temperature interrupt of both the heat pump and the Electro-Mate
elements. If you desire to interrupt only the heat pump, this is the wrong chip code or can be altered with
Handheld.
Temperature (Efficiency Dial) – Located on the front cover of the WF II Electro-Mate, the red center
screwdriver adjustment dial has a selection of A through G. These A through G selections represent a
supply temperature point at 0° outdoor. The closer the user or installer selection is to A, the flatter the
heat loss curve or the higher the operating efficiency. The closer a selected setting is to G, the steeper the
heat loss curve or the lower overall heat pump system efficiency. If knob is turned to “full” the WF II
will automatically go to “DT flat”.
WF-EZ3 adjustments and settings – only one setting, selection of the reversing valve logic. See page
11, paragraph 7. The normal/standby switch provides the standard user override function (some power
companies may request deactivation or deletion of this switch, call factory).

11/01/2007 14 HI320
Reference “WarmFlo Handheld Analyzer/Laptop Software” section in this manual for changes to your
chip functions.
HPEL Chip Code – Maximum Electric
Gas Only Operates with Utility Control
Application: 4-wire Thermostat, WF II Electro-Mate, Heat Pump, and gas/oil furnace. This code
will only allow gas/oil on during utility control – The WarmFlo II controller with this chip has outside
temperature reference for enabling the electric heat staging (except “E” tab). The outside temperature
(actual sensor) must be below these values before the stage will come on, independent of supply sensor
requirement.
Stage 1 = 5Ø°F 2 = 38°F 3 = 36°F 4 = 34°F
MU Time = 00 (disabled).
WF II DIAL SETTINGS
Lower right dial switch – min. warm air – This is the screwdriver adjust which sets a “floor” or level
minimum operating temperature. The supply temperature will never go below this point independent of
outdoor temperature. In other words, this is the flat horizontal line on the warm air versus outdoor
temperature curve. Reference manual “heat loss curve graph”.
0 = 90 4 = 98 Factory set on #3.
1 = 92 5 = 100
2 = 94 6 = 102
3 = 96 7 = 104
Top right dial switch - Built-in ODT or Low Temperature Switch-Over – The yellow screwdriver
adjustment dial can be set to terminate heat pump below ODT temp. Electric will stay on until
thermostat is satisfied. Gas will operate only during utility control (reference manual WF-ANZ* for
special programming).
The temperature settings related to the “ODT dial” are:
Ø = Disabled, no ODT switch-over
1 = -15°F 5 = 10°F Factory set on #3.
2 = -10°F 6 = 20°F
3 = 0°F 7 = 30°F
4 = 5°F
COMMENT: If you are using outdoor compressor built-in ODT, set the dial to “0”. At no time
can the outdoor compressor built-in ODT and WF II ODT setting (other than 0 = disable) be used
at the same time.
Temperature (Efficiency Dial) – Located on the front cover of the WF II Electro-Mate, the red center
screwdriver adjustment dial has a selection of A through G. These A through G selections represent a
supply temperature point at 0° outdoor. The closer the user or installer selection is to A, the flatter the
heat loss curve or the higher the operating efficiency. The closer a selected setting is to G, the steeper the
heat loss curve or the lower overall heat pump system efficiency. If knob is turned to “full” the WF II
will automatically go to “DT flat”.
WF-EZ3 adjustments and settings – only one setting, selection of the reversing valve logic. See page
11, paragraph 7. The normal/standby switch provides the standard user override function (some power
companies may request deactivation or deletion of this switch, call factory).
Reference “WarmFlo Handheld Analyzer/Laptop Software” section in this manual for changes to your
chip functions.

BARE (COM)
BARE (COM)
RED (RED)
BLACK (OT)
BLACK (ST)
RED (RED)
OUTSIDE
SENSOR (OT)
DUCT
SENSOR (ST)
HH329
Rev.B 07-25-07
ELECTRO INDUSTRIES, INC.
MONTICELLO, MN 55362
ELECTRO-MATE / WARMFLO SIMPLE PACKAGE
4-WIRE STAT W/ LMC
A1
R C Y E RED ST
OT
COM
MINIMUM
WARM
AIR
TEMPERATURE ODT
CAL.
EL ON
UPCP5615B CS
HP-ODT
V+ GND LO HI
K1
C5
SW3SW1 SW2
LED6 LED1LED2LED3LED4
LED5
T5 T4
T3
T2
T1
T6
J3
TB2
TB1
SW4
J1 J2
DETAIL B
WF-EZ3
1
1
VIOLET (T4)
PLUG TO BE REMOVED ONLY
WHEN USING A WF-HP2
INTERFACE MODULE
DETAIL A
EM WARMFLO
CONTROLLER
WF-ANZ*
HOOKUP
NOTES:
1. BRN/YEL WIRE, EXTRA WIRE, SEE MANUAL FOR STANDBY OVERRIDE OPTIONS.
2. 24V SOURCE IS FAN CENTER, FUSED WITHIN WF-LGR2, AS SHOWN POWERS
ROOM STAT AND HP.
3. N.C. FOR OFF-PEAK. IF OPPOSITE LOGIC, SEE MANUAL.
4. FOR DRAWING CLARITY, THE UNIT CONNECTION DETAILS ARE SHOWN
OPPOSITE ACTUAL INSTALLATION POSITION.
4
4
1

11/01/2007 15 HI320
WF-LGR3 & WF II WIRING & SETUP
WF-LGR3
Application – Standard heat pump room thermostat, heat pump, WF II Electro-Mate, gas/oil furnace. HP
manufacturer’s fossil fuel kit is not required.
Reference Drawing HH316
1. Attached to the WF-LGR3 is a cable harness that interfaces between the WF II and the WF-LGR3.
Note: Units produced after 08-04-04 (ARL #3074 and up) have an updated control board. This
update increases the size of the interface header from a four place to a ten place. See photo below
for proper cable installation.
2. Requirements:
Thermostat connection One 8-wire cable
Fan Center/Gas furnace connection One 5-wire cable
40VA or larger transformer
Blower connection “G” relay
Outdoor Heat Pump One 4-wire cable
3. Room Thermostat Connections – Including emergency and stage 2 connections
a. Install room thermostat at the desired room location with typical 8-wire thermostat cable
to the WF-LGR3.
Note: If this is a mechanical stat, adjustment of the heat anticipator is required, set
the heat anticipator to 0.2.
b. Thermostat Stage 2, Typically W or W1 - WarmFlo II does not incorporate Stage 2
function, there is no termination or connection for this wire. Nor is Stage 2 an optional
pickup point for any other function related outside of the WarmFlo II control
requirements. Simply leave unterminated or unused.
c. Thermostat Emergency, Typically E – If emergency hookup is requested or required
by the homeowner, see next page, paragraph 6, need to make the choice on emergency
switch action and note the comments concerning blower.
4. WF-LGR3 Connections
a. Install two wires (yellow “Y” and green “G”) from the 8-wire thermostat cable to the
WF-LGR3 upper left “stat” terminal block. If using emergency, wire according to above
guidelines. Basically the HP manufacturer’s thermostat is connected directly to the
outdoor unit as specified by the HP manufacturer, except the below wiring exceptions:
•The “Y” (first stage) is routed through this module.
•The “G” (blower) always goes to this module or inside air handler.
•The “E” (emergency) if emergency hookup is required simply attach emergency “E” from
thermostat connection to the BRN/YEL wire in the harness going to the WF II controller.
•The “W” (second stage) is not used with the WarmFlo II™ product (reference thermostat
section).
Note: You can use this WF-LGR3 enclosure as a “wiring center or cable termination”
position for the room thermostat cable going to the outside unit. As shown on
HH316, the large black dots represent three tie points for R, C, and O. Again, for

11/01/2007 16 HI320
convenience, you can make these three tie points within this enclosure. Over and
above the three tie points mentioned above, simply terminate “Y” and “G” at the
upper left terminal block.
b. Within the WF-LGR3 is a wire harness that goes from WF-LGR3 to the WF II
controller. Within this wire harness are two blue wires. Undo these, extend and connect
to the utility load control receiver. For electric energy operation (off-peak) the two blue
wires represent contact closure as shipped. Do not apply external voltage or external
power to the blue wires, they are simply looking for a closed contact during off-peak.
1. Where load management interrupt does not apply, simply leave the blue wires
tied together.
2. If load control reverse logic is required, keep the two blue wires shorted and
connect load control switch between X1 and R.
c. HP Outdoor Unit Connections – Over and above the three tie points mentioned above,
the only additional connection is the “Y” at the upper right terminal block. Since the
WarmFlo II controller inherently knows defrost and has its own methods for
distinguishing heat or cool mode, the switch over valve or reversing valve (RV) function
only applies to the thermostat and the outdoor unit.
d. Fan Center Connections - route a 5-wire cable from the WF-LGR3 module, bottom
center terminal block, to furnace fan center, same letter designated connections. The 5th
wire may be required for variable speed furnace “Y” terminal, see diagram in white
section.
e. Multi-speed Blower operation – reference manual “Special Application/Installation
Instructions” section.
WarmFlo II Controller Connection
Assumption - The WarmFlo II is strictly an enhancement or “add to” product. This manual does not
attempt to define the heat pump manufacturers installation, and assumes the heat pump is functional and
has not been altered from the factory. Also, the installing technician must have basic knowledge and
understanding of heat pump control logic and/or wire colors/functions. The basic heat pump
installation, checkout, troubleshooting, repair of its factory standard components is not covered in this
manual.
Wiring Connections
1. Sensor connection – see page 4 “WarmFlo II Sensors”.
2. WF II Controller is located on the cabinet right side door.
3. Plug the 4-wire pigtail from the WF-LGR3 into the left center connector. Do not force on the
connector, the connector only plugs in one way and should slide on easily.
4. Plug the yellow wire and connect to the WarmFlo II “Y” tab located on the top left portion of WF
controller.
Information - The WarmFlo II controller receives its operating power through the plug-in
wire harness. The yellow wire is simply the thermostat “call for heat” signal being
forwarded to the WarmFlo II controller.
5. The harness also comes with a violet wire, the violet wire is used as a “built-in” ODT for heat
pump compressor low temperature shut-off function. This function can have different meanings
depending upon setup. Reference “WarmFlo Handheld Analyzer/Laptop Software” section of
manual on ODT settings. Connect the violet wire to the WarmFlo II tab “HP ODT” or T4 (this
must be installed).
6. The cable has a 7th wire (brn/yel) is an extra wire for emergency connection. Depending upon
your desire for the emergency hookup you can choose one of two options:
i. Full electric as emergency - Connect the thermostat “E” wire through the BRN/YEL in
the WF-LGR3 to the main WarmFlo board “E” tab. In this case keeping the blower
running must be very carefully evaluated. According to Electro’s experience, most older
HP room thermostats drop the G function when you move the thermostat to “emergency”.
If this is the case, add a piggyback or second wire from the main WarmFlo board “E” tab
to the interface module “G1” tab. However, in the case of operating with special jumpers
for multi-speed blower, simply activating “G1” does not give you the same multi-speed