Completing Installation Of Return Air Smoke; Detector - Carrier 50FC 04 Series Service And Maintenance Instructions

Supply Air
Smoke Detector
Fig. 45 — Typical Supply Air Smoke Detector Sensor
Location
RETURN AIR SMOKE DETECTOR SENSOR WITHOUT
ECONOMIZER
The sampling tube is located across the return air opening on
the unit basepan. See Fig. 46. The holes in the sampling tube
face downward, into the return air stream. The sampling tube is
connected through tubing to the return air sensor that is mount-
ed on a bracket high on the partition between return filter and
controller location. The sensor is shipped in a flat-mounting lo-
cation. Installation requires that this sensor be relocated to its
operating location and the tubing to the sampling tube be
connected. See installation steps.
Return Air
Smoke Detector
(As Shipped)
Fig. 46 — Typical Return Air Smoke Detector
Location
RETURN AIR SMOKE DETECTOR SENSOR WITH
ECONOMIZER
The sampling tube is inserted through the side plates of the econo-
mizer housing, placing it across the return air opening on the unit
basepan. See Fig. 47. The holes in the sampling tube face
downward, into the return air stream. The sampling tube is con-
nected using tubing to the return air sensor mounted on a bracket
high on the partition between return filter and controller location.
The sensor is shipped in a flat-mounting location. Installation re-
quires the sensor be relocated to its operating location and the tub-
ing to the sampling tube be connected. See installation steps
below.
Fig. 47 — Return Air Sampling Tube Location (View
reoriented to show opposite side for clarity.)
Completing Installation of Return Air Smoke

Detector

Use the following steps to complete the installation of the return
air smoke detector.
1. Unscrew the two screws holding the return air sensor
detector plate. See Fig. 48. Save the screws.
Fig. 48 — Return Air Smoke Detector
Shipping Position
2. Remove the return air smoke sensor module and its
detector plate.
3. Rotate the detector plate so the sensor is facing outwards
and the sampling tube connection is on the bottom. See
Fig. 49.
25
Return Air
Sampling Tube
Flexible Exhaust Tubes
Screws
Sample Tube