ETI SIT-6E Installation Manual

We Manage Heat ®
Installation
Sensor Housing
Take care in choosing a location for your pavement-
mounted sensor. The location should be:
• Centered between runs of hydronic tubing or heater
cable.
• Exposed to precipitation and pedestrian or vehicular
traf c.
• Away from external heat sources in excess of 185° F.
(85° C.).
The SIT–6E sensor can be located up to 2,000 feet (609.6
meters) from the associated system controls. Use 3-conductor
#18 AWG jacketed cable for distances up to 500 feet (152.4
meters). Use #12 AWG for greater lengths. Insulate and
waterproof all splices.
The sensor plate ships installed in the sensor housing.
Before installing the sensor housing remove the sensor plate,
placing the sensor plate and the three machine screws where
they will not be lost or damaged.
Install the sensor housing on a firm, smooth surface such
as a precast patio block or similar masonry module. Care
should be exercised in adjusting the final grade and level
of the sensor to ensure that the sensor surface will be flush
with the finished pavement, and that the adjacent pavement
be either level or slightly crowned. A sensor submerged in
puddled water will not function properly. To stabilize the final
location of the sensor prior to paving, insert lengths of reinforcing rod or similar dowels on opposite sides of the
conduit and secure with iron tie wire.
Use the sheet metal cover supplied with the SIT–6E to protect the sensor housing during paving. The sensor plate should
not be installed until after paving is complete and the sheet metal cover is removed. Caulking may be required between the sensor
housing and the paved surface.
Conduit
3
Use individual / " (20 mm) rigid conduit for the entire installed length of the sensor cable, taking care to ensure that all embedded or
4
outdoor couplings and terminations are made watertight. Do not share conduit with other wiring. Do not route conduit across pavement
expansion or control joints. For sensors embedded in slab on grade, conduit should be depressed under these joints, as necessary.
Wiring
The SIT–6E sensor is furnished with 18"(46 cm) #18 AWG field leads. The red, black and white wires connect to the Control Panel
via user supplied cable. Use the epoxy filled wire nuts supplied. For proper wiring connections of the SIT–6E sensor to APS–3C,
APS–4C or EUR–5A controls consult the Installation Instructions for the appropriate Control Panel.
After wiring the sensor, kneed the supplied duct sealant till pliable. Pack duct sealant into the sensor housing leaving enough space
for the sensor electronics and wiring. Properly used, the duct sealant will minimize the accumulation of water and ice in the housing
and protect the sensor against possible ice damage.
Next, place wiring and electronics into the housing. Check for alignment between the sensor and pavement surfaces. If the sensor
and pavement are not aligned remove the sensor from the housing and adjust the housing flange. The housing flange can be raised up
to .63"(16 mm) to allow the sensor surface to be aligned with the pavement surface. A low sensor will pool water and not function
properly.
Model SIT
BLK (RETURN)
WHT (SIGNAL)
RED (POWER)
Epoxy-filled
Wire Nut (3)
ETI P/N 20757
3-Conductor
Flat Cable
Precast Concrete
Patio Block or Similiar
Masonry Module
®
–6E Snow Switch

Part Number 20756

Installation Manual
3/4" (20mm) Rigid Conduit
SIT–6E Installation Drawing
®
Duct Seal
ETI P/N 20763
Enclosure
ETI P/N 20760
Secure Conduit
WIth Dowels and
Iron Tie WIre
3
/ " (20 mm) rigid
4