Electro Industries WARMFLO II Owner's manual

01/10/2008 HI321
WARMFLO II
Dual Heat System
Furnace Interface Controller and Control Voltage Installation
and Operations
Application – Heat Pump Multi-Wire Thermostat
Basic or Single Speed Heat Pump
WF-LGR4
As in previous interface modules, this is the plug-in controller for Electro-Mate EM-WU***** or EM-
WD***** plenum heater. Mechanical installation information is contained within companion installation
manual EI703 or EI707.
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
sections of this document.
This is an upgraded and improved WF-LGR3. Improvements are the response of field requests.
Thermostat wiring terminal block, pass through
Improved stat emergency heat function, no longer requiring extra relay
Reversing valve detection relay, positive WarmFlo and gas furnace interrupt during
cooling (RV logic pin jumper setup required)
Front panel “cool” light
Equipped for ECM blower motor, direct Y connection
Faster defrost response
Easier single cable plug-in to the upgraded (10-pin connector) WarmFlo II board
Reference Field Service Bulletin 1094 which relates to heat pump units with RV logic high for heating –
this unit identified as “Rev A” and has a control board identifier “WFIH46708A” includes revisions
relating to stat emergency “E” hookup and operation, cool light function, etc. Also study page 7,
determine the need for “stat-B” pin jumper.
Any application – this design assumes the connected room thermostat cannot and does not output an
emergency “E” function during cooling. During any and all cooling operations, this controller board “E WF”
and “E GAS” tab must be at 0 volts.
Drawings: HH340
HD320
HH339 page 1
®

01/10/2008 HI321
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-LGR4 & WF II Wiring & Setup 6
Chip Code:
HPDH 8
HPDF 9
HPEL 10
OPERATION INDICATORS 12
Furnace Interface Module 12
WarmFlo II Controller 12
HANDHELD ANALYZER/LAPTOP SOFTWARE 14
SPECIAL APPLICATION/INSTALLATION 15
For Various Heat Pump, Multi-Speed, Multi-Stage Furnaces, Blower Options, Oil Furnace, etc.
OPTIONAL ACCESSORIES 16
TROUBLESHOOTING 16
Drawings Included: HH340
HD320, HH339 pg 1

01/10/2008 1 HI321
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, outdoor heat pump unit, and the heat pump manufacturer’s room
thermostat. 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. Attached HD320 is also a training
document. Also if you have not attended a WarmFlo training session, call the factory for other
descriptive documents or PowerPoint.
**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
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.

01/10/2008 2 HI321
MECHANICAL INSTALLATION
WF Furnace Interface, WF-LGR4
The mounting location from this enclosure is flexible to any convenient location were the thermostat
connection is easily accessible. The distance between this controller and WF II is limited only by the
provided 4’ cable.
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 controller 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.

01/10/2008 3 HI321
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.

01/10/2008 4 HI321
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

01/10/2008 6 HI321
WF-LGR4 & WF II WIRING & SETUP
WF-LGR4
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 HH340
1. The provided 10-wire cable includes all connections and functions between WF-LGR4 and the WF II
main board within the Electro-Mate unit.
a. The 10-pin connector on the main WarmFlo II board originated manufacturing date 08-
04-04 (ARL 3074). On the 10-pin connector may be a dummy cap plug, remove and
expose all 10 pins.
b. If with this installation you do not have WarmFlo II main board with the 10-pin header,
you can either update the WarmFlo board or call factory for special instructions for
cutting up the cable and terminating with female ¼” tabs.
c. If this installation is with the new upgraded WarmFlo and the new WF+ control board,
there is no thermostat, heat pump, furnace, load control wiring or field hookup on the
WF+ board. All thermostat, load control, etc. connections are on this separate enclosure
board. Even though the WF+ board is larger, when plugging in the 10-wire cable the
WF+ board functions identical to the normal WarmFlo II main board.
2. All field connections and wiring from thermostat/heat pump/furnace are now are directly at this
controller, there are no bypass wires.
3. Room Thermostat Connections – upper left terminal block, 5 or 6-wire cable.
a. Terminology is universal, should match most any heat pump room thermostat.
b. The W at the roomstat is not used.
c. Since this controller is single speed only, there should only be a Y1.
d. Do not use “dual fuel” or complex/sophisticated room thermostat.
e. If you desire to use the roomstat emergency lever or function, you have a choice to
connect the “E” screw to either WF or GAS tab. Electro recommends WF (full plenum
heater output) and use the override switch in the front of this controller as your gas
switchover.
4. Heat pump outdoor unit – upper right terminal block, 4 or 5-wire cable. Terminology should be
universal, but some units provide colored wires only. Installer will need to match the wire color to
these lettered functions.
R – 24-volt power
C – 24-volt common
Y – compressor contactor coil
RV (O) – reversing valve, typically orange
a. As an option (if the installer is absolutely confident of this function), the defrost output
wire can be connected to DF (W1) tab to increase the plenum heater kW output (all
stages on immediate) when the outdoor unit initiates defrost.
b. Since this controller can only be used for single speed equipment, there should only be a
single Y function.
c. These are the only connections or wires needed from the outdoor unit.
5. Furnace terminal block – bottom center terminal block, 4 or 5-wire cable. Terminology should be
universal.
a. The Y is only needed for variable speed, ECM motor, type blowers.
b. The power for this controller and the Electro-Mate/WarmFlo comes from the furnace
transformer and is R and C at this bottom terminal block.
6. Utility Load Control – if utility load control applies, remove the blue jumper from the bottom left
terminal block and connect the utility NC contact receiver or device.
a. If opposite control logic is required, contact factory for other wiring instructions.

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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.
CONTROLLER SETUP OR PROGRAMMING
RV Logic Selection, Setup Required
Since this model uses the reversing valve thermostat wire to disable WarmFlo and the gas furnace during
cooling, it is extremely important the installer knows the RV logic of the installed HP unit and the pin
jumper at the center top of this controller board is properly selected.
The HEAT and COOL represents when the reversing valve is high or at 24 volts. Example –
pin jumper between center and “COOL” means the reversing valve wire is at 24 volts during
cooling.
The factory default is pin jumper setup for cool = high.
Important – if there is operational difficulty during defrost with the reversing valve (O) wire
changing states during defrost or a RV logic high during heating application using stat B
screw, you must have a wire connected to the DF (W1) tab representing a high voltage during
the outdoor unit defrost mode. A high input at the DF (W1) tab disconnects the RV (O) input
wire and also affects the WarmFlo “E” tab.
Using roomstat “B” function for units which are setup as heating = high RV logic – with this
arrangement you must provide the shorted pin jumper on the upper left side of the board marked “Stat-
B”. When received or all applications using cooling = high RV logic, the two pegs are open and the pin
jumper is simply “hanging” on one of the pins. For this application the two pins must be shorted.

01/10/2008 8 HI321
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 table below represents the typical WF II chip codes and defaults for use with a WF-LGR4. 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 DT cal.
HPDF 50°, 38°, 36°, 34° 30 EL to SB DT cal.
HPEL 50°, 38°, 36°, 34° 00 HP DT cal.
MU Time - Standby or Gas Furnace Operation - Whenever all four stages are full on (if it is not a
four-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 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: 8-wire standard heat pump 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 to 90 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 the heat pump or via special programming can terminate heat
pump and electric to allow total gas operation below ODT temp. (reference manual WF-ANZ*).
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”.

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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-LGR4 adjustments and settings – The normal/standby switch provides the standard user override
function (some power companies request inactivation or deletion of this switch).
Requires selection of the proper RV logic at the LGR4 board top center, see page 7.
Reference “WarmFlo Handheld Analyzer/Laptop Software” section in this manual for changes to your
chip functions.
HPDF Chip Code – Electro-Mate Undersized
Application: 8-wire standard heat pump 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 to 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.
Electric will stay on until thermostat is satisfied. The only time gas will be used is in 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
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.

01/10/2008 10 HI321
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-LGR4 adjustments and settings – The normal/standby switch provides the standard user override
function (some power companies request inactivation or deletion of this switch).
Requires selection of the proper RV logic at the LGR4 board top center, see previous page.
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
The primary intent for this default arrangement is total electric heat pump without standby gas/oil furnace.
However, there are some specific dual heat applications where HPEL could apply.
1. On a temporary basis gas furnace is not operative.
2. Gas/oil furnace is intended or used only during load control function.
Application: 8-wire standard heat pump 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 – disabled or 00
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 – This is the screwdriver
adjustment dial that can be set to terminate heat pump below ODT temp. The only time gas will be
used is in 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”.
Temperature (Efficiency Dial) – Located on the front cover of the WF II Electro-Mate, the center red
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

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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-LGR4 adjustments and settings – The normal/standby switch provides the standard user override
function (some power companies request inactivation or deletion of this switch).
Requires selection of the proper RV logic at the LGR4 board top center, see previous page.
Reference “WarmFlo Handheld Analyzer/Laptop Software” section in this manual for changes to your
chip functions.

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OPERATION INDICATORS
WF-LGR4 Front Monitor LED’s
•Utility, off-peak – utility load management receiver is not interrupting.
•HP call – the output “Y” screw terminal is active at 24 volts high. The outdoor unit should
be on and running. This LED will be off when the OT sensor is below the setup ODT value.
•T-stat call – the room thermostat Y or E is active or 24 volts high.
•Cool mode – follows the reversing valve wire, top center pin jumper selects the high logic. If
installed and setup correctly this light is always on when the roomstat lever is in cool.
•Gas call – the furnace “W” or terminal block feeding fan center W is 24 volts high.
•Monitor LED Comments – the “utility, off-peak” LED is a true representation of the load
control blue wires. It will not react to the override switch, A1 tab, program MU timeout,
SOT-S, etc. However, the main WF II board “EL ON” is a true representation of what’s
going on within the WarmFlo logic.
Override Switch – the front panel slide switch (very similar to standard Electro-Mate DFC) is a direct
hardware disabling of any WarmFlo and electric elements functions. The room thermostat heat call wire
or function is directly controlling the fossil fuel or gas furnace. This totally resides within this controller,
the WarmFlo II main board could be completely disconnected or completely non-functional but the
override switch will still allow fossil fuel furnace operation. This function can also be on a remote
switch, see page 16 “SB” tab.
Blower Operation – the blower function is totally within this controller and has nothing to do with the
main WarmFlo board. The stat “G” function is directly channeled to the furnace “G”. The thermostat
“Y” and “E” activate an internal “furnace G” with an approximate 10-second turn on delay and a 1-
minute turn off delay.
The furnace “Y” is also activated when the internal blower relay is on from an HP heat or cool call.
WarmFlo II Main Board
Strip Heat Disable – To maximize heat pump system energy efficiency and preventing “accidental”
unnecessary resistant strip heat when it is not required, this WarmFlo II disables or locks out strip heat
elements based upon outdoor temperature.
Depending upon program code chip and information in the colored sections, the strip heat may not
activate or operate unless the WF outdoor sensor is below the ODT dial setting. Typically for a heat
pump, factory settings are:
Stage 1 - 5Ø°F
Stage 2 - 38°F
Stage 3 - 36°F
Stage 4 - 34°
Monitor LED’s on WF II Board
Green LED - When illuminated 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.
•OT sensor - 1ØØ ms blink every second.
•ST sensor - two, 1ØØ ms blinks every second.
•Both bad - ½ second on, ½ second off, alternating.
Amber LED – When illuminated WarmFlo II is in the electric heat operating mode.

01/10/2008 13 HI321
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 bottom).
EM-WU*****/EM-WD***** Inside Relay Board Monitor Light
COMMENT: This relay board relates to standard Electro-Mate, if this WF-LGR4 is connected to
the new Electro-Mate with a WF+ board, the internal relays and relay driver board are
totally different. The following does not apply, see description within the Electro-Mate
manual itself.
Inside Red LED - Illuminates when the low voltage hi-limit sensor probe opens. This applies
only after thermostat heat call and WarmFlo II controller is activating the various element stages.
If there is a hi-limit condition, red LED is illuminated. As soon as the hi-limit cools and snaps
back in, red LED extinguishes.
Triac Relay Module (under inside relay board)
This module has its own built-in LED. When the LED is on, the triac switch is closed, elements will be
heating. This LED shall operate coincident with Stage 1 on the WarmFlo board.
COMMENT: The relay board activates from the WarmFlo II main board as WarmFlo II interprets the
“Y” input voltage in relationship to both temperature sensor requirements. However, the “Y” input
also directly controls the Stage 1 triac and the staging relays. Whenever the “Y” input goes to 0 volts
(at the end of the cycle) the relay output immediately goes off and strip heat is turned off and not
necessarily stepped down as shown by the WarmFlo II monitor Red LED’s. This is a safety feature;
strip heat cannot be accidentally kept on by WarmFlo II internal logic if there is no “Y” input.

01/10/2008 14 HI321
STAT OVERRIDE TIMER (SOT)
This is a field option internal timer which can be field programmed with WF analyzer to select a roomstat
cycle run time. If this downloaded run time (typically 90 minutes) is exceeded before the thermostat is
satisfied, the system automatically switches to either full electric elements or standby.
-SOT S – this is the longer set timer which allows transfer to standby if something might have
happened to the electric system unmonitored.
-SOT E – this must be shorter time than above, is typically used to overcome morning setback
pickup issues. In other words, if you would field download 30 minutes and you program the
setback stat to begin bringing up the temperature 30 minutes prior to the wakeup time; and the
system is not at the new higher temperature at the 30-minute point it will automatically jump to
all stages full on (DT flat) in order to more rapidly raise the building temperature. However, this
also means you will be “short cycling” the HP compressor during other heat calls. The
maximum run time for the compressor is then about 30 minutes at any time of the day or at any
particular heat call.
Notice: Effective program code chips after 7-7-04 the SOT S has been factory set at 90 minutes. This is
an added safety feature to minimize house freeze-up if something is wrong with the electric section,
switching over to standby furnace.
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.
See the enclosed “WarmFlo Information” document (HD320) for functional details.
Blower speed
-Both the ST and the OT can have temperature entries which provide a SPD A and SPD B
signal within the 10-pin cable for further interface with optional relays to further control
ECM variable speed motors. See next section.

01/10/2008 15 HI321
SPECIAL APPLICATION/INSTALLATION
For Various Heat Pump, Multi-Speed, Multi-Stage Furnaces, Blower Options, Oil Furnace, etc.
Typical Oil Furnace Comment
This controller is designed to interface directly with a furnace fan center containing 24-volt transformer
(40VA or larger), blower relay, and a “W” function to operate the fossil fuel furnace. If this installation is
for an oil furnace with only oil control “T and T” terminals, a fan center will need to be added plus an
isolation relay at the “W” terminal so only isolated contacts are connected to the oil burner master control
“T and T”. Another choice is to use a standard fan center and order EE-5053 relay with accompanying
HD001 instruction sheet.
Wood Furnace or Other Non-Automatic Standby Furnace
WarmFlo II works ideally with a wood furnace because it modulates (or adds to) the electric element to
maintain a fixed temperature output. Thus the wood fire can “die down” and the supply sensor (ST) will
make up electric element heat to keep the building comfortable. The other operating extreme is a “hot”
wood fire where it is adequate to heat the building. In this case the supply sensor will be measuring
temperature greater than required and turn off all elements automatically. However, there must be
adequate controls on the wood furnace so that the discharge temperature does not exceed 180°F.
2-Stage Gas Furnace – from Electro’s experience all 2-stage gas furnaces must have a W1 before
reacting to a W2 or special variable burner second control wire. Realizing this, any of these W2 functions
from a special roomstat can go directly to the furnace terminal block. This LGR4 properly handles W1
which is the main control function for the furnace.
2-Stage or 2-Speed Compressor – this WF-LGR4 must only be used on single stage equipment. If you
have 2-speed compressor equipment, use and order controller built for the application – WF-HP2.
Variable speed, ECM motor, blower – standard within this controller, the furnace Y connection will
always have voltage relating to the cooling speed requirement. This Y function voltage is not present
during standby. With this basic and provided feature the ECM motor basically has two speeds –
continuous air, G only and G and Y combination for full cooling speed.
Load control, other products or hardware – if there is a need to “pass on” the utility load control
receiver function to other heating equipment, radiant floor boiler, peak interrupter, etc. the addition of a
plug-in EE-5051 switching relay can easily accomplish this extra load control function. Simply connect
the high impedance DC coil to tab R and common. Drawing HH339 provides wiring information.
Caution: You cannot use “any relay coil” for this function. Suggest one of the above model numbers or
special DC high impedance 24-volt relay.

01/10/2008 16 HI321
OPTIONAL ACCESSORIES
Standby Override – The front switch provides a very effective override switch to fossil fuel furnace
capability. This is a hardware override switch and does not depend upon the WarmFlo board,
microprocessor, electronics, etc. Typically this takes the place of dual fuel heat pump thermostat
“emergency lever” function.
Remotely located standby override switch – on the left side of the I/F board is a “SB” tab. Using an
external switch between this “SB” tab and a common tab provides the same function as the front override
switch. Whichever switch is in the up or override position takes priority. In other words, they both need
to be in the down position during cooling.
Note: All override switches must be in normal or electric position during cooling.
Load Shedding, Electrical Service Entrance Not Adequate - When using the 10 kW Electro-Mate on a
100-amp service with other major appliances, there are very simple techniques to make sure the 100-amp
service is not overloaded. These are based upon inserting one 240 wire from either or both the electric
dryer/electric range through a small donut CT. This detection of appliance turn-on immediately drops out
a secondary 5 kW load. Both techniques have the necessary input detection delay window to compensate
for pulse modulation stove top burners.
-EM-LV104L* – Order EZ-Mate plenum heater with load shed capability – 5 kW firm, 5 kW
shed.
-PI-ØA1DYMO – Sensor CT (1 or 2, ½” donut), 4 wire low voltage connection to standard
Electro-Mate or WarmFlo II/ Electro-Mate – drops 1 stage or typical 5 kW (reference
drawing PH510).
-PI-Ø31DYHO – Sensor CT ( 1 or 2, ½” donut), service panel wiring, drops electric water
heater or any 25-amp circuit appliance/electric heater.
TROUBLESHOOTING
Comment: Also see the “WarmFlo Information” document (HD320) included with this manual.
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.
Outdoor Sensor (OT) Location – direct sunlight has a definite affect on sensor temperature reading.
The sensor white tube must be “shadowed” from direct sun rays.
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
turn off the 24-volt source power (probably furnace or air handler circuit breaker), when the green LED
goes out, count to 10, and re-energize power supply.

01/10/2008 17 HI321
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. The outdoor sensor must be located outdoors for this controller to correctly operate. Do not leave the
outdoor sensor “hang in conditioned space” and attempt to run this system.
5. 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.
-OT sensor – approximately 1/10 second blip every ½ second
-ST sensor – two, 1/10 second blips every ½ second
-Both bad – ½ second on and ½ second off, alternating
Bad sensor, could disable cooling – depending upon the ODT setting a bad sensor, even during cooling,
can affect the ODT of the compressor and the compressor will be off. Temporary fix is to set the ODT
dial to “0” position and get the sensor fixed. Verify with plug-in Analyzer and/or no blinking green LED.
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 fan center “R” and all other WarmFlo II functions,
including the “R” going to the outdoor unit. Use only two amp, fast blow.

E L E C T R O I N D U S T R I E S , I N C .
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