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such as smoke from a fire, ca uses the sensor to signal an
alarm state but dust and debris accumulated over time
does not.
For installations using two sensors, the duct smoke
dete ctor does not differentiate which sensor signals an
alarm or trouble condition.
Smoke Detector Locations
Supply Air — The Supply Air smoke detector sensor is
located to the left of the unit’s indoor (supply) fan. See
Fig. 37. Access is through the fan access panel. There is
no sampling tube used at this location. The sampling tube
inlet extends through the side plate of the fan housing
(into a high pressure area). The controller is located on a
bracket to the right of the return filter, accessed through
the lift--off filter panel.
Smoke Detector Sensor
C08245
Fig. 37 -- Typical Supply Air Smoke Detecto r Sensor
Location
Return Air without Economizer — The sampling tube is
located across t he return air opening on the unit basepan.
See Fig. 38. The holes in the sampl ing tube face
downward, into the return air stream. The sampling tube is
connec ted via tubing to the ret urn air sensor tha t is
mounted on a bracket high on the partition between return
filter and controller location. (This sensor is shipped in a
flat--mounting location. Installation requires that this
sensor be relocated to its operating location and the tubing
to the sampling tube be connected. See “Completi ng
Installation of Return Air Smoke Sensor” for installation
steps.)
Return Air Detector Sampling Tube
Controller module
Return Air Detector module
(shipping position shown)*
*RA detector must be moved from shipping position to operating position by installer
C07307
Fig. 38 -- Typical Return Air Detector Location
Return Air with Economizer — The sampling tube is
inserted through the side plates of the economizer
housing, plac ing it across the return air opening on the
unit basepan. See Fig. 39. The holes in the sampling tube
face downward, into the return air stream. The sampling
tube is connected via tubing to the return air sensor that is
mounted on a bracket high on the partition between return
filter and controller location. (This sensor is shipped in a
flat--mounting location. Installation requires that this
sensor be relocated to its operating location and the tubing
to the sampling tube be connected. See “Completi ng
Installation of Return Air Smoke Sensor” for installation
steps.)
Return Air
Sampling Tube
C08129
Fig. 39 -- Return Air Sampling Tube Location
Comple ting Installa tion of Return Air Smoke
Sensor:
SCREWS
EXHAUST
TUBE
FLEXIBLE
EXTENSION
TUBE
SAMPLING
C08126
Fig. 40 -- Return Air D etector Shipping Positio n
1. Unscre w the two screws holding the Return Air
Sensor detector plate. See Fig. 40. Save the scre ws.
2. Remove the Return Air Sensor and its detector plate.
3. Rotate the de tector plate so the sensor is fa cing out-
wards and the sampling tube connection is on the bot-
tom. See Fig. 41.
4. Screw the sensor and detector pla te into its operating
position using screws from Step 1. Make sure the
sampling tube connection is on the bottom and the ex-
haust tube is on the top. See Fig. 41.
5. Connect the flexible tube on the sampling inlet to the
sampling tube on the basepan.
548J