Smoke Detectors; Controller Options; Economi$Er Iv Occupancy Switch - Bryant 549J Series Installation Instructions Manual

4. Press the (Menu Up/Exit) button to complete the action
and return to the previous menu.
NOTE: If the alarm still exists after clearing it, it is redisplayed
within 5 seconds.

SMOKE DETECTORS

Smoke detectors are available as factory-installed options on 549J
models. Smoke detectors may be specified for Supply Air only or
for Return Air without or with economizer, or in combination of
Supply Air and Return Air. Return Air smoke detectors are ar-
ranged for vertical return configurations only. All components
necessary for operation are factory-provided and mounted. The
unit is factory-configured for immediate smoke detector shutdown
operation; additional wiring or modifications to unit terminal
board may be necessary to complete the unit and smoke detector
configuration to meet project requirements.
Units equipped with factory-optional Return Air smoke detectors
require a relocation of the sensor module at unit installation. See
Fig. 49 for the as-shipped location.
Completing Return Air Smoke Sensor Installation
1. Unscrew the two screws holding the Return Air Smoke
Detector assembly. See Fig. 50, Step 1. Save the screws.
2. Turn the assembly 90 degrees and then rotate end to end.
Make sure that the elbow fitting is pointing down. See Fig.
50, Step 2.
3. Screw the sensor and detector plate into its operating posi-
tion using screws from Step 1. See Fig. 50, Step 3.
4. Connect the flexible tube on the sampling inlet to the sam-
pling tube on the basepan.
RETURN AIR
SMOKE DETECTOR
(AS SHIPPED)
Fig. 49 — Return Air Smoke Detector,
Shipping Position
Additional Application Data
Refer to the application data document "Factory Installed Smoke
Detectors for Small and Medium Rooftop Units 2 to 25 Tons" for
discussions on additional control features of these smoke detectors
including multiple unit coordination.
RTU OPEN CONTROLLER (FACTORY OPTION)
For details on operating 549J units equipped with the factory-in-
stalled RTU Open controller option, refer to the Factory-Installed
Option RTU Open Multi-Protocol Controller Controls, Start-Up,
Operation and Troubleshooting manual.

CONTROLLER OPTIONS

Low Ambient
If the unit comes with Electro-Mechanical (EM) control, then no
adjustment is necessary.
If the unit comes with the RTU Open control option, then refer to
its installation control manual for details on adjusting "Cooling
Lock-Out" setting and configure for the specific job requirements.
Step 12 — Adjust Factory-Installed Options
SMOKE DETECTORS
Smoke detector(s) will be connected at the Controls Connections
Board, at terminals marked "Smoke Shutdown." Cut jumper JMP
3 when ready to energize unit.

ECONOMI$ER IV OCCUPANCY SWITCH

See Fig. 51 for general EconoMi$er IV wiring. External occupan-
cy control is managed through a connection on the Controls Con-
nections Board.
If external occupancy control is desired, connect a time clock or
remotely controlled switch (closed for Occupied, open for Unoc-
cupied sequence) at terminals marked OCCUPANCY. Cut jumper
JMP 2 to complete the installation.
Step 13 — Install Accessories
Available accessories include:
• Roof curb
• Thru-base connection kit (must be installed before unit is
set on curb)
• Electric heaters and single-point connection kits
• Manual outside air damper
• Two-position motorized outside air damper
• EconoMi$er ® IV (with control)
• EconoMi$er2 (without control/for external signal)
• Power Exhaust
• Differential dry-bulb sensor (EconoMi$er IV)
• Outdoor enthalpy sensor
• Differential enthalpy sensor
• CO sensor
2
• Smoke Detector (Return Air and/or Supply Air)
• Louvered hail guard
• Motormaster head pressure controls
®
• Phase monitor control
Refer to separate installation instructions for information on in-
stalling these accessories.
41