8
Heat-Timer Corp.
Install tHe sensors
systeM and return sensors InstallatIon
• Only use the Standard Brass Tube sensors (HTC #904250-00) supplied as the
SEQ System Sensor and MOV System Sensor. The Return Sensor is optional
and can be purchased separately.
• The sensor wires can be extended up to 500' using a shielded 2-conductor cable
(Belden #8760 or equivalent). Do not connect the shield at the sensor but at the
panel using one of the terminals marked with an “O”.
• Install a 3/8"ID immersion well (HT # 904011-00).
• Insert the sensor probe of the supplied sensor into the well.
• Do not run sensor wires in conduit with line voltage wiring.
locatIng tHe seQ systeM sensor
• Place the SEQ System sensor approximately 10' feet past the last heating boiler
on the common supply header but before any major takeoffs.
• The SEQ System sensor must be located where it sees the output of all the stages.
If a boiler is piped so that the SEQ System sensor does not see its output, the SQ-
Elite-MV will not sequence the boilers correctly.
locatIng tHe MoV systeM sensor
• Place the MOV System sensor approximately 10' feet past the motorized valve
but before any major takeoffs.
locatIng tHe return sensor
• Place the Return sensor approximately 10' feet before the boilers on the SEQ
System loop return line.
Immersion Well
3/8" ID 1/2" NPT
Heating System
Sensor
Common Supply Pipe
Sensor Probe
Immersion Heating System Sensor
Shield
alert
If any of the System Sensors cannot
sense the correct system water
temperature, the SQ-Elite-MV will not
provide comfortable heat levels.
outdoor sensor InstallatIon
• Only use the Heat-Timer sensor included with the unit (HT# 904220-00).
• Locate the sensor in the shade on the north side of the building. The sensor
should never be in direct sunlight.
• Be sure the location is away from doors, windows, exhaust fans, vents, or other
possible heat sources.
• The sensor should be mounted approximately 10' feet above ground level.
• Adhere the Outdoor Label provided to the back of the sensor base.
• Use the Enclosure Base bottom knockout for the conduit. Use the locknut to hold
the conduit and enclosure base together. Screw the cover to the base.
• If screws are used to affix the enclosure to the wall, make sure to seal around the
sensor and wall except from the bottom.
• The sensor wires can be extended up to 500' using shielded 2-conductor cable
(#18/2). Do not connect the shield at the sensor but at the control using the
terminal marked with an “O”.
• Do not run sensor wires in conduit with line voltage wiring.
alert
determining the proper location for the outdoor sensor is
very important. the sQ-elite-MV will base its operation on the
outdoor temperature information it receives from this location.
If the sensor is in the sun, or covered with ice, its reading will
be different from the actual outdoor temperature.
Outdoor
Sensor
snap-in
location
Shield
not connected
Conduit
Outdoor Label
on back of Sensor
Outdoor Sensor
Mounting
screws
location
Seal around
sensor and wall
Outdoor
drip-hole
