48
Staged Air Volume (SAV™) with Variable
Frequency Drive (Factory-Installed Option)
For details on operating 50HC 2 stage cooling units
equipped with the factory-installed Staged Air Volume op-
tion, refer to the Variable Frequency Drive (VFD) Installa-
tion, Start-Up and Service Instructions.
ComfortLink Control (Factory-Installed Option)
For details on operating 50HC units equipped with the fac-
tory-installed ComfortLink option, refer to Controls, Start-
Up, Operation and Troubleshooting for 48/50HC 04-28 Sin-
gle Package Rooftop Unit with ComfortLink Controls.
PremierLink™ Controller (Factory Option)
For details on operating 50HC units equipped with the fac-
tory-installed PremierLink controller option, refer to the Pre-
mierLink Retrofit Rooftop Controller Version 3.x Installa-
tion, Start-Up, and Configuration instructions manual.
RTU Open Controller
For details on operating 50HC units equipped with the fac-
tory-installed RTU Open controller option, refer to the Facto-
ry-Installed 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 con-
troller option, refer to the appropriate 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 Central Termi-
nal Board (CTB), at terminals marked “Smoke Shutdown”.
Remove jumper JMP 3 when ready to energize unit.
ECONOMI$ER
®
IV OCCUPANCY SWITCH
Refer to Fig. 58 for general EconoMi$er IV wiring. Exter-
nal occupancy control is managed through a connection on
the Central Terminal Board.
If external occupancy control is desired, connect a time
clock or remotely controlled switch (closed for Occupied,
open for Unoccupied sequence) at terminals marked OCCU-
PANCY on CTB. Remove or cut jumper JMP 2 to complete
the installation.
Fig. 58 — EconoMi$er IV Wiring
Economizer 2 Position Damper
Unit Without Economizer or
2 Position Damper
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