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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
15
HI321
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