11/01/2007 1 HI320
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
