Completing Installation Of Return Air Smoke; Detector - Carrier WeatherMaster 50HCQ04-12 Service And Maintenance Instructions

*RA detector must be moved from shipping
position to operating position by installer.
Fig. 50 — Typical Return Air Smoke Detector
Location
RETURN AIR SMOKE DETECTOR SENSOR WITH
ECONOMIZER
The sampling tube is inserted through the side plates of the
economizer housing, placing it across the return air opening on
the unit basepan. See Fig. 51. The holes in the sampling tube
face downward, into the return air stream. The sampling tube is
connected using tubing to the return air sensor mounted on a
bracket high on the partition between return filter and control-
ler location. The sensor is shipped in a flat-mounting location.
Installation requires the sensor be relocated to its operating lo-
cation and the tubing to the sampling tube be connected. See
"Completing Installation of Return Air Smoke Sensor" for in-
stallation steps.
Fig. 51 — 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 Re-
turn Air Smoke Detector.
1. Unscrew the two screws holding the Return Air Sensor
Detector plate. See Fig. 52. Save the screws.
RETURN AIR
DETECTOR MODULE
(Shipping position
shown)*
CONTROLLER
MODULE
RETURN AIR DETECTOR
SAMPLING TUBE
RETURN AIR
SAMPLING TUBE
Fig. 52 — Return Air Smoke Detector Module
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. 53.
4. Screw the sensor and detector plate into operating position
using screws from Step 1. Ensure the sampling tube con-
nection is on the bottom and the exhaust tube is on the top.
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 inte-
grated into the economizer housing but connecting the
flexible tubing to the sampling tube is the same.
RETURN AIR SENSOR
(Operating Position Shown)
Fig. 53 — Return Air Sensor Operating Position
28
FLEXIBLE EXHAUST
TUBES
SCREWS
SAMPLE TUBE
CONTROLLER
MODULE
SCREWS (2)
SAMPLE TUBE