71
Smoke Detectors
Smoke detectors are available as factory-installed options on
48LC 14-26 models. Smoke detectors may be specified for supply
air only, for return air without or with economizer, or in combina-
tion of supply air and return air. The unit is factory-configured for
immediate smoke detector shutdown operation; additional wiring
or modifications to unit’s Integrated Staging Control (ISC) board
may be necessary to complete the unit and smoke detector config-
uration to meet project requirements.
RETURN AIR SENSOR TUBE INSTALLATION
The return air sampling tube is shipped in the unit’s supply fan
section, attached to the blower housing (see Fig. 74). Its operating
location is in the return air section of the unit (see Fig. 75, unit
without economizer, or Fig. 76, unit with economizer), inserted
into the return air sensor module housing which protrudes through
the back of the control box.
To install the return air sensor sampling tube:
1. Remove the tube from its shipping location.
2. Open the unit end to access the return air sensor (located on
right-hand partition).
3. Orient the tube’s sampling holes into the return air flow direc-
tion. For vertical application, position the sampling holes on
the bottom of the tube, facing into the bottom return duct
opening. For horizontal application, position the sampling
holes on the side of the tube, facing the unit’s end panel.
4. Insert the sampling tube into the return air sensor module
until the tube snaps into position.
5. Replace end panel or outside air hood.
Fig. 74 — Typical Supply Air Smoke Detector
Sensor Location
Fig. 75 — Return Air Sampling Tube Location in Unit
without Economizer
Fig. 76 — Return Air Sampling Tube Location in Unit
with Economizer
SMOKE DETECTOR TEST MAGNET
Locate the magnet; it is shipped in the control box area.
ADDITIONAL APPLICATION DATA
Refer to Factory Installed Smoke Detectors for Small and Me-
dium Rooftop Units 2 to 25 Tons for discussions on additional
control features of these smoke detectors including multiple
unit coordination.
Step 13 — Install Accessories
Available accessories include:
• Roof curb (must be installed before unit)
• EconoMi$er
®
X (with controller)
• Power exhaust
• Outdoor enthalpy sensor
• Differential enthalpy sensor
•CO
2
sensor
• Temperature and humidity sensors
• Louvered hail guard
• Phase monitor control
Refer to separate installation instructions for information on in-
stalling these accessories. See Price Pages for a complete list of
field-installed accessories.
ROTA
TI
O
N
RETURN AIR
SAMPLING TUBE
(SHIPPING LOCATION)
RETURN AIR DETECTOR
SAMPLING TUBE
RETURN AIR DETECTOR
SAMPLING TUBE
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