Return Air Enthalpy Sensor; Smoke Detectors - Carrier 50TC Series Installation Instruction

Return Air Enthalpy Sensor —
Mount the return- - air enthalpy sensor (33CSENTSEN) in
the return- - air section of the economizer. The return air
sensor is wired to
(33CSENTHSW). See Fig. 73.
24V
– 4-20
Main
GND
+ VDC
Out
LOW
Outside Air
Enthalpy Switch
+ 24-36
VDC In
– 4-20 Main
Out
Fig. 73 - - Outside and Return Air Enthalpy Sensor
Wiring

Smoke Detectors

Smoke detectors are available as factory- - installed options on
50TC 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 to meet project
requirements.
Units equipped with factory- - optional Return Air smoke
detectors require a relocation of the sensor module at unit
installation. See Fig. 74 for the as shipped location.
Step 1
the enthalpy controller
RED PL6-1 (24-V)
BLK PL6-4 (COM)
CTB ECON
GRA 7
(P'LINK: to J4-2) or
(RTU Open: to J2-6)
Return Air
Enthalpy
Sensor
C11161
Fig. 75 - - Completing Installation of Return Air Smoke Sensor
Return Air
Smoke Detector
(as shipped)
Fig. 74 - - Return Air Smoke Detector, Shipping Position
Completing Installation of Return Air Smoke Sensor:
1. Unscrew the two screws holding the Return Air
Smoke Detector assembly. See Fig. 75, 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. 75, Step 2.
3. Screw the sensor and detector plate into its operating
position using screws from Step 1. See Fig. 75, Step 3.
4. Connect the flexible tube on the sampling inlet to the
sampling tube on the basepan.
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.
Step 2
43
C12282
Step 3
C12283