Carrier 50LC 07, Инструкции по обслуживанию и техническому обслуживанию, Страница: 18 / 100

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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. 20 -- 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. 21.) 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 installation steps).
Return Air
Sampling Tube
C08129
Fig. 21 -- Return Air Sampling Tube Location
SCREWS
EXHAUST
TUBE
FLEXIBLE
EXTENSION
TUBE
SAMPLING
C08126
Fig. 22 -- Return Air Detector Shipping Position
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 connection 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
sampling 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.
C08127
Fig. 23 -- Return Air Sensor Operating Position
FIOP Smoke Detector Wiring and Response
All Units
FIOP smoke detector is configured to automatically shut
down all unit operations when smoke condition is
detected. See Fig. 24, Smoke Detector Wiring.
Highlight A
JMP 3 is factory--cut, transferring unit control to smoke
detector.
Highlight B
Smoke detector NC contact set will open on smoke alarm
condition, de--energizing the ORN conductor.
Highlight C
24--v power signal via ORN lead is removed at Smoke
Detector input on LCTB; all unit operations cease
immediately.
Highlight D
On smoke alarm condition, the smoke detector NO Alarm
contact will close, supplying 24--v power to GRA
conductor.