Carrier 48HC D17 Series Service And Maintenance Instructions page 33

RETURN AIR SENSOR
(Operating Position Shown)
Fig. 41 - - Return Air Sampling Tube Location in
Unit with Economizer
Fig. 42 - - Typical Smoke Detector System Wiring
CONTROLLER
MODULE
SCREWS (2)
SAMPLE TUBE
B
33
C12050
D
C
F
E
A
48TM502525 D
C12559