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To wire the return air enthalpy sensor, perform the
following:
1. Use a 2−conductor, 18 or 20 AWG, twisted pair cable
to connect the return air enthalpy sensor to the enthal-
py controller.
2. Connect the field−supplied RED wire to (+) spade
connector on the return air enthalpy sensor and the
(+) terminal on the enthalpy controller. Connect the
BLK wire to (−) spade connector on the return air en-
thalpy sensor and the (−) terminal on the enthalpy
controller.
Smoke Detectors
Smoke detectors are available as factory−installed options on
581J models. Smoke detectors may be specified for Supply
Air only or for Return Air without or with economizer or in
combination of Supply Air and Return Air. All components
necessary for operation are factory−provided and mounted.
The unit is factory−configured for immediate smoke detector
shutdown operation; additional wiring or modifications to
unit terminal board may be necessary to complete the unit
and
smoke
detector
configuration
requirements.
Units equipped with factory−optional Return Air smoke
detectors require a relocation of the sensor module at unit
installation. See Fig. 56 for the as shipped location.
Completing Installation of Return Air Smoke Sensor:
1. Unscrew the two screws holding the Return Air
Smoke Detector assembly. See Fig. 57, Step 1. Save
the screws.
2. Turn the assembly 90 degrees and then rotate end to
end. Make sure that the elbow fitting is pointing
down. See Fig. 57, Step 2.
3. Screw the sensor and detector plate into its operating
position using screws from Step 1. See Fig. 57, Step 3.
4. Connect the flexible tube on the sampling inlet to the
sampling tube on the basepan.
Step 1
to
meet project
Step 2
Fig. 57 − Completing Installation of Return Air Smoke Sensor
Return Air
Smoke Detector
(as shipped)
Fig. 56 − Return Air Smoke Detector, Shipping Position
Additional Application Data —
Refer to the Application Data sheet titled Factory
Installed Smoke Detectors for Small and Medium Rooftop
Units 2 to 25 Tons for discussions on additional control
features of these smoke detectors including multiple unit
coordination.
35
C12282
Step 3
C12283
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