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© 2011
D 406 - 12/11
Sensor Wiring
Note: The temperature sensor (thermistor) is built into the
sensor enclosure.
Remove the screw and pull the front cover off the sensor
enclosure.
The outdoor sensor can either be mounted directly onto a
wall or a 2” x 4” electrical box. When the outdoor sensor is
wall mounted, the wiring should enter through the back or
bottom of the enclosure. Do not mount the outdoor sensor
with the conduit knockout facing upwards as rain could
enter the enclosure and damage the sensor.
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In order to prevent heat transmitted through the wall from
affecting the sensor reading, it may be necessary to install
an insulating barrier behind the enclosure.
The outdoor sensor should be mounted on a wall which best
represents the heat load on the building (a northern wall
for most buildings and a southern facing wall for buildings
with large south facing glass areas). The outdoor sensor
should not be exposed to heat sources such as ventilation
or window openings.
The outdoor sensor should be installed at an elevation above the
ground that will prevent accidental damage or tampering.
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Mounting the Outdoor Sensor
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Sensor with bottom
entry wiring
Sensor with rear
entry wiring
Sensor mounted
onto 2" x 4"
electrical box
Wiring the Heat Pump
The 406 can operate a single heat pump with a two-stage
compressor in heating or cooling mode.
Connect the Rc1 and Y1 terminals on the 406 to the R and
Y1 terminals on the heat pump.
Connect the Rc2 and Y2 terminals on the 406 to the R and
Y2 terminals on the heat pump.
Connect the Rc1 and O/B terminal on the 406 to the R and
O or B terminal on the heat pump.
Wiring the Auxiliary Backup
The 406 can operate an auxiliary backup other than a boiler.
Use the Backup terminals on the 406 to switch on the aux-
iliary backup (ie electric element).
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On/Off Boiler
Connect the Backup terminals on the 406 to the T-T (or R-
W) terminals on the boiler.
Modulating Boiler
Wire the Mod (dc/mA) positive (+) and negative (-) terminals
on the 406 to the input signal terminals on the boiler. Correct
polarity of the wires is important.
In some cases, the modulating boiler also requires contact
closure on the T-T terminals to fire the boiler. If required,
connect the Backup terminals on the 406 to the T-T (or R-
W) terminals on the boiler.
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Connect 18 AWG or similar wire to the two terminals provided in the
enclosure and run the wires from the outdoor sensor to the control. Do
not run the wires parallel to telephone or power cables. If the sensor
wires are located in an area with strong sources of electromagnetic
interference (EMI), shielded cable or twisted pair should be used or
the wires can be run in a grounded metal conduit. If using shielded
cable, the shield wire should be connected to the Com or Com Sen
terminal on the control and not to earth ground.
Follow the sensor testing instructions in this brochure and connect
the wires to the control.
Replace the front cover of the sensor enclosure.
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Wiring the Outdoor Sensor
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Wires from outdoor
sensor to control
terminals
(Com Sen - Out Sen)
Sensor is built into
the enclosure
