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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
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
RV Logic Selection, Setup Required
7
HI321
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