Service Manual

9 of 48 © 2015 680_D - 10/15
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The boiler return sensor is only used when a mixing valve or variable speed
injection mixing is installed. The boiler return sensor protects the boiler from
cold return water temperatures.
• If applicable, connect the boiler return sensor to terminals 8 and 10.
Wiring the Boiler Return Sensor ------------------------------------------------------------------------
Mounting the System Supply Sensor -------------------------------------------------------------------
The system supply sensor is used in most hydronic applications except
when only operating a boiler.
• If applicable, connect the system supply sensor to terminals 11 and 12.
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11 12 13
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The system return sensor is used in conjunction with the flow sensor to
determine energy consumption. If applicable, connect the system return
sensor to terminals 11 and 13.
Wiring the System Return Sensor ----------------------------------------------------------------------
Mounting the Boiler Supply Sensor --------------------------------------------------------------------
The boiler supply sensor is used when operating a boiler.
• If applicable, connect the boiler supply sensor to terminals 8 and 9.
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Bottom of
Enclosure 080
Universal
Sensor
Cable Tie
Sensor Well
Retaining
Clip
Universal
Sensor
Immersion Well
If a Universal Sensor is mounted onto 1" (25 mm) diameter L type copper pipe,
there is approximately an 8 second delay between a sudden change in water
temperature and the time the sensor measures the temperature change. This
delay increases considerably when mild steel (black iron) pipe is used. In general,
it is recommended that a temperature well be used for steel pipe of diameter
greater than 1-1/4" (32 mm). Temperature wells are also recommended when
large diameter pipes are used and fluid stratification is present.
Conduit Connection
The Universal Sensor and Universal Sensor Enclosure 080 (sold separately) are
specifically designed to mount onto a 3/8" (10 mm) ID temperature well that is
supplied with an end groove. To install the well, plumb a tee into the pipe and fix
the well into the tee. The 080 enclosure has a 7/8" (22 mm) back knockout that
must be removed and fitted over the temperature well. The universal sensor is
then inserted into the well and the retaining clip supplied with the enclosure is
snapped onto the well end groove. If the well has a threaded end, the installer
must supply a standard threaded conduit retaining ring. The two wires from the
sensor are connected to the terminal block provided in the enclosure. The other
side of the terminal block is used to connect wires from the control.