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Optional - Multi-speed/variable-speed blower connection - Newer "high tech" gas furnaces, special
blower speeds, may require energizing fan center "G" and "Y" during WarmFlo II heating cycle.
Provisions are included for an extra blower relay contact for appropriate multi-speed wiring.
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Added jumper wires
Variable speed blower, operate a low speed during low heat requirements – fall 2002 new feature
allows selecting an outdoor temperature to change furnace blower speed. Ideal for newer and 2-stage heat
pumps, but requires special connection and special programming. Request description document HD319
with its appropriate hookup and support drawings.
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. Although when using WF-LGR3 there is another optional hookup for
roomstat emergency switch, see previous page 16 or special drawing HH320.
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.
Manual switch or forced gas furnace (stand-by) function - On the main WarmFlo II board, top center,
is tab marked "A1". A switch or jumper from "A1" to "R" will cause a direct gas furnace operation and
interrupt or terminate the heat pump. This can be used for a test switch.
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.
07/31/2007
25
HI320
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