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WF-EM3 & WF II WIRING & SETUP
WF-EM3
Application – non-heat pump, standard Electro-Mate/fossil fuel furnace/with or without air conditioning.
Reference Drawing HH318
1. Attached to the WF-EM3 is a 4' cable harness that interfaces between the WF II and the WF-EM3.
Note: Units produced after 08-04-04 (ARL #3074 and up) have an updated control board. This
update increases the size of the interface header from a four place to a ten place. See photo below
for proper cable installation.
2. Requirements:
a. Thermostat connection
b. Fan Center/Gas furnace connection One 4-wire cable
c. Outdoor Heat Pump
3. Room Thermostat Connections – Install room thermostat at the desired room location and route the
typical four wires (red, white, green, and yellow) to the WF-EM3 upper left "stat" terminal block.
Note: If this is a mechanical stat, adjustment of the heat anticipator is required, set the heat
anticipator to 0.2.
4. Fan Center Connections – Route a 4-wire cable from the I/F module, bottom center terminal block
"fan center", to furnace fan center, same letter designated connections (R,W,G,C).
5. If air conditioning is part of your installation simply route one 2-wire cable from the upper right
terminal block Y and C to the compressor relay Y and C.
6. Within the WF-EM3 is a wire harness that goes from WF-EM3 to the WF II controller. Within this
WF-EM3 wire harness are two blue wires. Undo these, extend and connect to the utility load control
receiver. For electric energy operation (off-peak) the two blue wires represent contact closure as
shipped. Do not apply external voltage or external power to the blue wires, they are simply
looking for a closed contact during off-peak.
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Optional – where load management interrupt does not apply, simply leave the blue wires tied
together and wire nut.
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If load control reverse logic is required, keep the two blue wires shorted and connect load
control switch between X1 and R.
WarmFlo II Controller Connection
1. Sensor connection – see page 4 "WarmFlo II Sensors".
2. WF II controller is located on the cabinet right side door.
3. Plug the 4-wire pigtail from WF-EM3 into the left center connector. Do not force on the
connector, the connector only plugs in one way and should slide on easily.
4. Plug the yellow wire and connect to the WarmFlo II "Y" tab located on the top left portion of
WF controller.
11/01/2007
One 4-wire cable
40VA or larger transformer
Blower connection "G" relay
One 2-wire cable
6
HI320
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