Sensory/Accessory Installation; Additional Rtu Open Installation And Troubleshooting; Economizer Systems - Bryant 551K 04N Series Service And Maintenance Instructions

Sensory/Accessory Installation

IMPORTANT: Refer to the specific sensor or accessory
instructions for its proper installation and for rooftop unit
installation refer to base unit installation instructions and the
unit's wiring diagrams.
There are a variety of sensors and accessories available for the
RTU Open. Some of these can be factory or field installed,
while others are only field installable. The RTU Open control-
ler may also require connection to a building network system
or building zoning system. All field control wiring that con-
nects to the RTU Open must be routed through the raceway
built into the corner post of the unit or secured to the unit con-
trol box with electrical conduit. The unit raceway provides the
UL required clearance between high and low-voltage wiring.
Pass the control wires through the hole provided in the corner
post, then feed the wires thorough the raceway to the RTU
Open. Connect the wires to the removable PCB connectors and
then reconnect the connectors to the board.
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal inju-
ry, death and/or equipment damage.
Disconnect and lockout/tagout electrical power before wir-
ing the RTU Open controller.
Additional RTU Open Installation and
Troubleshooting
Additional installation, wiring and troubleshooting information
for the RTU Open Controller can be found in the following
manual: "582/559K, 581/551K Single Package Rooftop Units
with RTU Open Controls, Start-up, Operation and Trouble-
shooting Instructions."

ECONOMIZER SYSTEMS

The unit may be equipped with a factory-installed or accessory
(field-installed) economizer system. Three types are available:
two with logic control systems (EconoMi$er
EconoMi$er IV) and one without a control system
(EconoMi$er2). See Fig. 49 - 51 for component locations on
each type.
NOTE: For 551K rooftop units EconoMi$er IV is only available
as a field-installed accessory.
Economizers use direct-drive damper actuators.
IMPORTANT: Any economizer that meets the economizer
requirements as laid out in California's Title 24 mandatory
section 120.2 (fault detection and diagnostics) and/or pre-
scriptive section 140.4 (life-cycle tests, damper leakage, 5
year warranty, sensor accuracy, etc), will have a label on
the economizer. Any economizer without this label does
not meet California's Title 24. The five year limited parts
warranty referred to in section 140.4 only applies to factory
installed economizers. Please refer to the economizer on
your unit.
OUTSIDE AIR
TEMPERATURE SENSOR
Fig. 49 — EconoMi$er X Component Locations
OUTSIDE AIR
TEMPERATURE SENSOR
Fig. 50 — EconoMi$er IV Component Locations
OUTSIDE AIR
TEMPERATURE SENSOR
X and
®
Fig. 51 — EconoMi$er2 Component Locations
27
ECONOMI$ER X
HARNESS
LOW AMBIENT
ECONOMI$ER IV
SENSOR
CONTROLLER (W7212)
ECONOMI$ER2 PLUG