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location and the tubing to the sampling tube be connected.
See “Completing Installation of Return Air Smoke
Sensor:” for details.)
Return Air Detector Sampling Tube
Controller module
Return Air Detector module
(shipping position shown)*
*RA detector must be moved from shipping position to operating position by installer
C07307
Fig. 61 -- Typical Return Air Detector Location
Return Air 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. 62. The holes in the
sampling tube face downward, 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 the following installation procedure.)
Return Air
Sampling Tube
Flexible
Exhaust Tube
C10330
Fig. 62 -- 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. 63. Save the screws.
Controlle
r
Screws
Flexible
Exhaust
Tubes
Sampling Tube
C10331
Fig. 63 -- Return Air Detector Shipping Position
2. Remove the Return Air Sensor and its detector plate.
3. Rotate the detector plate so the sensor is facing out-
wards and the sampling tube connection is on the bot-
tom. See Fig. 64.
Sampling Tube
C10332
Fig. 64 -- Return Air Sensor Operating Position
4. Screw the sensor and detector plate into its operating
position using screws from Step 1. Make sure the
sampling tube connection is on the bottom and the ex-
haust tube is on the top. See Fig. 64.
5. Connect the flexible tube on the sampling inlet to the
sampling tube on the basepan.
Additional Application Data —
Refer to Catalog No. HKRNKA--1XA for discussions on
additional control features of these smoke detectors
including multiple unit coordination.
50HCQA