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SPECIAL APPLICATION/INSTALLATION
For Various Heat Pump, Multi-Speed, Multi-Stage Furnaces, Blower Options, Oil Furnace, etc.
Furnace Interface Module Interchangeability
The WarmFlo II controller can operate with any furnace interface module series (1, 2, 3). The updated
I/F module series have additional features and are more convenient for installation, but all I/F module
models will work (without new features) with this controller. This manual includes the installation and
operation for the I/F modules listed on cover.
Partially Completed Installation
If during the initial building construction there is a need for Electro-Mate only operation for an extended
period of time, move the yellow (or heat call wire) from Y to E tab. This conditions the WarmFlo II to all
stages on and essentially bypassed all temperature functions.
Fossil Fuel Furnace Comment
Furnace interface modules (WF-EZ3, LGR3, EM3, etc.) are 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.
Load Control Interrupt, Blower Function
Internal to the furnace interface module the control logic applies a "G" function to the furnace fan center
whenever there is a call for heat (electric mode only). In the heating mode this is independent of the
thermostat "G". In the cooling mode only the thermostat "G" gets to the fan center "G". Some
thermostats (especially multi-stage HP manufacturer's stat) provide the "G" function for both heat and
cool. In this case the green wire coming from the thermostat will take precedence and be in direct control
of the furnace blower.
If there is a desire to interrupt the roomstat "G" during load control (gas furnace operates its own blower),
route the roomstat green wire through the interface module left tabs (EZ3 and LGR3 only) COM and EL.
Optional, gas furnace outlet temperature HP safety – the interface module 100° gas furnace
temperature sensor probe, protects HP compressor, can still be added. Order part EM5713 and follow its
instructions (R37 on PC board must be cut).
11/01/2007
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HI320
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