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OUTDOOR SENSOR INSTALLATION
(Used Only when Sensor Type is set to Outdoor)
• The SMC does not come with the Outdoor Sensor (HT# 904220-
00). It must be ordered separately. See "Outdoor Sensor
Operation Overview" on page 6.
• 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 any possible heat or cool sources.
• The sensor should be mounted approximately 10' feet above
ground.
• 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.
• The sensor wires can be extended up to 500' using 18 AWG
2-conductor shielded cable (HT# 703001-01).
• Do not connect the shield at the sensor end. However, connect
the shield at the control using terminal 17.
WATER TEMPERATURE SENSOR INSTALLATION
Slab Supply and Return Sensors
• The provided Slab Supply and Return sensors (HT# 904250)
must be inserted in the provided wells (1/2"NPT, 3/8" I.D)
(HT# 904011-00). The wells must be inserted in the pipe where it
will be in fluid flow .
• Make sure the supply sensor is installed approximately ten feet
of pipe downstream from the heat source to avoid temperature
fluctuations.
• The slab return sensor can be installed in any convenient location
where the anti-freeze solution has returned from all the slab
branches.
• The sensor wires can be extended up to 500' using 18 AWG
2-conductor shielded cable (HT# 703001-01).
• Do not connect the shields at the sensors' ends. However,
connect them to SMC terminals 27 and 29.
Boiler Return Sensor
• To help prevent thermal shock stress to the boiler, use the Boiler
Return Sensor. The SMC can function without this sensor.
However, when used in a Motorized Valve application, it prevents
the boiler return from dropping below the Minimum Boiler Return
setting. It does this by modulating the valve partially closed. See
"Minimum Boiler Return" on page 29.
SMC Installation and Operation Manual
Seal around
sensor and wall
Mounting
screws
location
Outdoor
drip-hole
Well
Immersion Temperature Sensor
Shield
Connect
Sensor
To control
Enclosure
Sensor
Probe
Outdoor Sensor
snap-in location
Shield
not connected
Outdoor Label
on back of Sensor
Conduit
Conduit
Sensor
in well
Immersion Well
3/8" ID 1/2" NPT
Common
Supply
Pipe
11
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