Carrier 50HCQ04---12 - Manual (Page 2)

2
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment
can be hazardous due to system pressure and electrical
components. Only trained and qualified service personnel
should install, repair, or service air-conditioning
equipment. Untrained personnel can perform the basic
maintenance functions of replacing filters. Trained service
personnel should perform all other operations.
When working on air-conditioning equipment, observe
precautions in the literature, tags and labels attached to
the unit, and other safety precautions that may apply.
Follow all safety codes. Wear safety glasses and work
gloves.
Follow all safety codes. Wear safety glasses and work
gloves. Have fire extinguisher available. Read these
instructions thoroughly and follow all warnings or
cautions attached to the unit. Consult local building codes
and National Electrical Code (NEC) for special
requirements.
Recognize safety information. This is the safety--alert
symbol
. When you see this symbol on the unit and in
instructions or manuals, be alert to the potential for
personal injury.
Understand the signal words DANGER, WARNING, and
CAUTION. These words are used with the safety--alert
symbol. DANGER identifies the most serious hazards
which will result in severe personal injury or death.
WARNING signifies a hazard which could result in
personal injury or death. CAUTION is used to identify
unsafe practices which may result in minor personal
injury or product and property damage. NOTE is used to
highlight suggestions which will result in enhanced
installation, reliability, or operation.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Disconnect all power to the unit before performing
maintenance or service. Unit may automatically start
if power is disconnected.
!
WARNING
GENERAL
The RTU--OPEN controller is an integrated component of
the Carrier rooftop unit. Its internal application
programming provides optimum performance and energy
efficiency. RTU--OPEN enables the unit to run in 100%
stand--alone control mode, Carrier’s I--Vu Open network,
or a Third Party Building Automation System (BAS).
On--board DIP switches allow you to select your protocol
(and baud rate) of choice among the four most popular
protocols in use today: BACnet, Modbus, Johnson N2 and
LonWorks. (See Fig. 1.)
Carrier’s diagnostic display tools such as Field Assistant
BACview6 Handheld or Virtual BACview can be used
with the RTU--OPEN controller. Access is available via a
5--pin J12 access port.
SENSOR/ACCESSORY
INSTALLATION
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 controller may also require connection to a
building network system or building zoning system. All
field control wiring that connects to the RTU-OPEN must
be routed through the raceway built into the corner post of
the unit or secured to the unit control 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 Phoenix
connectors and then reconnect the connectors to the board.
See Fig. 1 and Table 1 for board connections and Fig. 2
for Typical Factory RTU-OPEN wiring.
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.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury, death and/or equipment damage.
Disconnect electrical power and use lock--out tags
before wiring the RTU--OPEN controller.
!
WARNING