Completing Installation Of Return Air Smoke; Sensor - Carrier WeatherExpert 50LC 07 Series Service And Maintenance Instructions

SMOKE DETECTOR

SENSOR

Fig. 19 — Typical Supply Air Smoke Detector Sensor
Location
RETURN AIR WITHOUT ECONOMIZER
The sampling tube is located across the return air opening on the
unit basepan. (See Fig. 20.) The holes in the sampling tube face
downward, into the return air stream. The sampling tube is con-
nected via tubing to the return air sensor that is mounted on a
bracket high on the partition between return filter and controller
location. (This sensor is shipped in a flat-mounting location. In-
stallation requires that this sensor be relocated to its operating lo-
cation and the tubing to the sampling tube be connected. See in-
stallation steps).
*RA detector must be moved from shipping
position to operating position by installer.
Fig. 20 — Typical Return Air Detector Location
RETURN AIR 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. 21.) The holes in the sampling tube face down-
ward, into the return air stream. The sampling tube is connected
via tubing to the return air sensor that is mounted on a bracket high
on the partition between return filter and controller location. (This
sensor is shipped in a flat-mounting location. 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
DETECTOR MODULE
(Shipping position
shown)*
CONTROLLER
MODULE
RETURN AIR DETECTOR
SAMPLING TUBE
Fig. 21 — Return Air Sampling Tube Location

Completing Installation of Return Air Smoke

Sensor
1. Unscrew the two screws holding the return air sensor detector
plate. (See Fig. 22.) Save the screws.
2. Remove the return air sensor 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. 23.)
4. Screw the sensor and detector plate into its operating position
using screws from Step 1. Make sure the sampling tube con-
nection is on the bottom and the exhaust tube is on the top.
(See Fig. 23.)
5. Connect the flexible tube on the sampling inlet to the sam-
pling tube on the basepan.
6. For units with an economizer, the sampling tube is integrated
into the economizer housing but the connection of the flexible
tubing to the sampling tube is the same.
Fig. 22 — Return Air Detector Shipping Position
15
RETURN AIR
SAMPLING TUBE
SCREWS
FLEXIBLE
EXHAUST
TUBES
SAMPLE
TUBE