Completing Installation Of Return Air Smoke; Detector; Fiop Smoke Detector Wiring And Response - Bryant Preferred 549K 04-06 Service And Maintenance Instructions

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. 42. 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
location and the tubing to the sampling tube be connected. See
installation steps below.
Fig. 42 — 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. 43. Save the screws.
Fig. 43 — Return Air Smoke Detector
Shipping Position
2. Remove the return air smoke sensor module and its
detector plate.
RETURN AIR
SAMPLING TUBE
FLEXIBLE EXHAUST TUBES
SCREWS
SAMPLE TUBE
3. Rotate the detector plate so the sensor is facing outwards
and the sampling tube connection is on the bottom. See
Fig. 44.
RETURN AIR SMOKE DETECTOR
(Operating Position Shown)
Fig. 44 — Return Air Smoke Detector
Operating Position
4. Screw the sensor and detector plate into its operating posi-
tion using screws from Step 1. Ensure the sampling tube
connection 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.

FIOP Smoke Detector Wiring and Response

ALL UNITS
The FIOP smoke detector is configured to automatically shut
down all unit operations when a smoke condition is detected.
See Fig. 45, Smoke Detector Wiring.
HIGHLIGHT A
Smoke detector NC contact set will open on smoke alarm con-
dition, de-energizing the ORN conductor.
HIGHLIGHT B
24-v power signal using the ORN lead is removed at the smoke
detector input on UCB; all unit operations cease immediately.
RTU OPEN CONTROLS
Unit operating functions (fan, cooling and heating) are termi-
nated as described above. In addition:
HIGHLIGHT C
On smoke alarm condition, the smoke detector NO Alarm con-
tact will close, supplying 24-v power to GRA conductor.
HIGHLIGHT D
WHT lead at Smoke Alarm input on UCB provides 24-v signal
to FIOP DDC control.
RTU OPEN
The 24-v signal is conveyed to RTU Open-J1-10 input termi-
nal. This signal initiates the FSD sequence by the RTU Open
control. FSD status is reported to connected BAS network.
USING REMOTE LOGIC
Six conductors are provided for field use (see Highlight E) for
additional annunciation functions.
23
CONTROLLER
MODULE
SCREWS (2)
SAMPLE TUBE