29
wiring terminals. The controller has three LEDs: Power,
Trouble and Alarm. A manual test/reset button is located
on the cover face.
Controller Housing
and Electronics
Conduit Couplings
(supplied by installer)
Fastener
(2X)
Alarm
Trouble
Power
Test/Reset
Switch
Controller Cover
Cover Gasket
(ordering option)
Terminal Block Cover
Conduit Support Plate
Conduit Nuts
(supplied by installer)
Duct Smoke Sensor
Controller
C08208
Fig. 34
−
Controller Assembly
Sensor
The sensor (see Fig. 35) includes a plastic housing, a
printed circuit board, a clear plastic cover, a sampling
tube inlet and an exhaust tube. The sampling tube, when
used, and exhaust tube are attached during installation.
The sampling tube varies in length depending on the size
of the rooftop unit. The clear plastic cover permits visual
inspections without having to disassemble the sensor. The
cover attaches to the sensor housing using four captive
screws and forms an airtight chamber around the sensing
electronics. Each sensor includes a harness with an RJ45
terminal for connecting to the controller. Each sensor has
four LEDs: Power, Trouble, Alarm and Dirty. A manual
test/reset button is located on the left side of the housing.
Air is introduced to the duct smoke detector sensor’s
sensing chamber through a sampling tube that extends into
the HVAC duct and is directed back into the ventilation
system through a (shorter) exhaust tube. The difference in
air pressure between the two tubes pulls the sampled air
through the sensing chamber. When a sufficient amount of
smoke is detected in the sensing chamber, the sensor
signals an alarm state and the controller automatically
takes the appropriate action to shut down fans and
blowers, change over air handling systems, notify the fire
alarm control panel, etc.
The sensor uses a photoelectric (light scattering principle)
process called
differential sensing
to prevent gradual
environmental changes from triggering false alarms. A
rapid change in environmental conditions, such as smoke
from a fire, causes the sensor to signal an alarm state but
dust and debris accumulated over time does not.
See Detail A
Detail A
Plug
Sampling Tube
(ordered separately)
Coupling
Magnetic
Test/Reset
Switch
Alarm
Trouble
Power
Dirty
Sensor Cover
Cover Gasket
(ordering option)
Sensor Housing
and Electronics
Exhaust Gasket
Exhaust Tube
Duct Smoke Sensor
Intake
Gasket
TSD-CO2
(ordering option)
C08209
Fig. 35
−
Smoke Detector Sensor
For installations using two sensors, the duct smoke
detector 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. 36. 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.
SUPPLY AIR
SMOKE
DETECTOR
SENSOR
C10325
Fig. 36
−
Typical Supply Air Smoke Detector Sensor
Location
Summary of Contents for 50TC*17 Series
Page 39: ...39 C10818 Fig 44 RTU OPEN Control Module...
Page 69: ...69 APPENDIX IV WIRING DIAGRAMS C150370 Fig 58 50TC D30 Control Diagram 208 230 3 60...
Page 70: ...70 APPENDIX IV WIRING DIAGRAMS 5 C150368 Fig 59 50TC D30 Control Diagram 460 575 3 60...
Page 71: ...71 APPENDIX IV WIRING DIAGRAMS C150373 Fig 60 50TC D17 D30 Power Diagram 208 230 3 60...
Page 72: ...72 APPENDIX IV WIRING DIAGRAMS C12399 Fig 61 50TC D17 D30 Power Diagram 460 575 3 60...
Page 77: ...77 APPENDIX IV WIRING DIAGRAMS C12690 Fig 66 50TC PremierLinkt System Control Wiring Diagram...
Page 78: ...78 APPENDIX IV WIRING DIAGRAMS C12691 Fig 67 50TC RTU OPEN Wiring Diagram...
Page 79: ...79 APPENDIX IV WIRING DIAGRAMS C12689A Fig 68 50TC SAV VFD System Control Wiring Diagram...