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RETURN AIR
SMOKE DETECTOR
(AS SHIPPED)
Fig. 52 — 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.
PREMIERLINK™ (FACTORY OPTION)
For details on operating 50HCQ unit equipped with the factory-in-
stalled PremierLink controller option refer to the "PremierLink
Retrofit Rooftop Controller Version 3.x Installation, Start-up, Op-
eration and Troubleshooting" manual.
RTU OPEN CONTROLLER (FACTORY OPTION)
For details on operating 50HCQ 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.
STEP 1
Fig. 53 — Completing Installation of Return Air Smoke Sensor
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 11 — 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$ER IV OCCUPANCY SWITCH
See Fig. 54 for general EconoMi$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 12 — 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.
STEP 2
43
STEP 3
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