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RTU Open Control System
For details on operating units equipped with the factory-installed
RTU Open controller, refer to the "Factory-Installed RTU Open
Multi-Protocol Controller Control, Start-Up, Operation and Trou-
bleshooting" 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$ER IV OCCUPANCY SWITCH
See Fig. 58 for general EconoMi$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$er
•
EconoMi$er2 (without control/for external signal)
•
Power Exhaust
•
Differential dry-bulb sensor (EconoMi$er IV)
•
Outdoor enthalpy sensor
•
Differential enthalpy sensor
•
CO
•
Smoke Detector (Return Air and/or Supply Air)
•
Louvered hail guard
•
Motormaster
•
Phase monitor control
Refer to separate installation instructions for information on in-
stalling these accessories.
Fig. 58 — EconoMi$er IV Wiring
44
®
IV (with control)
sensor
2
®
head pressure controls
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