Operating instructions

12/23/2011 10 EI711A
Use care in selecting location so the sensor does not pick up false temperature from the heat pump
outdoor unit, from refrigerant line sets, dryer vent, reflection off of steel siding, etc. Also do not install
the sensor in a plastic box because it will falsely trap and pick up radiant sun temperature.
Other Sensor Related Comments
The factory supplied OT cable is 25 feet. If additional cable length is required, you must use the
following rules for extending the cable.
 Use unshielded (low capacitance, preferred twisted) 3 or 4-wire low voltage cable.
 50 feet is maximum.
 Do not, under any circumstances, use leftover wires within the thermostat cable going out to
the outdoor unit.
 Route the sensor cable making sure you do not crimp, cut, staple, or damage the cable in any
way.
 Keep sensor cables at least 12” away from any line voltage wiring, romex, etc.
 Cut to length. Do not bundle additional wire.
For easy sensor cable disconnect and reconnect, the WarmFlo board has a plug-in 4-place terminal block.
Before disconnecting, you will notice two red wires are under one screw and two white wires is under the
COM screw. The black wire represents the data information from each sensor and must be connected to
the appropriate OT or ST screw.
The sensor has polarity, is sensitive to wrong voltage, must be protected from static voltage, etc. Do not
cross connect or inadvertently short out sensor wires with power on. Permanent destruct damage may
result.
Utility Load Control
Bottom 2-screw terminal block marked blue and blu/wht. Remove the jumper and extend the two wires
to the utility furnished control device. 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.
 The maximum “AC noise” on the blue wire is 5 volts, peak to peak. The blue/white wire is
actually common and if grounding is proper as suggested in the next paragraph, this should
dampen any effect. But it is always good practice to run these wires separate from any current
carrying line voltage Romex or other conductors.
 One load control wire pair handles both winter and summer interrupt. Please attach enclosed tag
to the power company or utility end of the provided two wires.
 If load control reverse logic is required, consult factory for interposing relay – or a “closed to
interrupt” contact can be connected to SB SW to COM (see page 11).
 If load management interrupt does not apply, simply leave the blue wires jumpered.
Grounding
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.
Room Thermostat – Heat Pump – Gas Furnace
Route and connect the communicating A, B, C, D four wires between the manufacturer’s components as
specified in the manufacturer’s installation instructions. This unit has additional hookup connections after
you have completed and perhaps operated the Evolution
™
or Infinity
™
system as wired and configured by
the manufacturer’s supplied information.