50
Fig. 57 — Return Air Smoke Detector, Shipping
Position
ADDITIONAL APPLICATION DATA — Refer to the Appli-
cation Data sheet titled 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.
Staged Air Volume (SAV™) with Variable Fre-
quency Drive (Factory Option)
For details on operating 48HC 2 stage cooling units equipped
with the factory-installed Staged Air Volume option, refer to
the Variable Frequency Drive (VFD) Installation, Setup and
Troubleshooting Supplement.
ComfortLink Control (Factory Option)
For details on operating 48HC units equipped with the factory-
installed ComfortLink controls option, refer to Controls, Start-
Up, Operation and Troubleshooting for 48/50HC 04-28 Single
Package Rooftop Unit with ComfortLink Controls.
PremierLink™ Controller (Factory Option)
For details on operating 48HC units equipped with the factory-
installed PremierLink controller option, refer to the Premier-
Link Retrofit Rooftop Controller Version 3.x Installation,
Start-Up, and Configuration instructions manual.
RTU Open Controller
For details on operating 48HC units equipped with the factory-
installed RTU Open controller option, refer to the Factory-In-
stalled Option RTU Open Multi-Protocol Controller Controls,
Start-Up, Operation and Troubleshooting manual.
Controller Options
LOW AMBIENT CONTROL (FACTORY OPTION)
If the unit comes with Electro-Mechanical (EM) control, then
no adjustment is necessary.
If the unit comes with PremierLink™ or RTU Open controller
option, then refer to its installation control manual for details
on adjusting “Cooling Lock-Out” setting and configure for
your specific job requirements.
Fig. 58 — Completing Installation of Return Air Smoke Sensor
RETURN AIR
SMOKE DETECTOR
(AS SHIPPED)
STEP 1 STEP 2 STEP 3
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