Carrier 50TC*17 Series Service And Maintenance Instructions page 31

RETURN AIR SENSOR
(Operating Position Shown)
Fig. 38 − Return Air Sampling Tube Location in Unit with Economizer
Fig. 39 − Typical Smoke Detector System Wiring
CONTROLLER
MODULE
SCREWS (2)
SAMPLE TUBE
31
B
D
C
A
48TM502525 D
C12050
F
E
C12559