General Information
RT-SVX23G-EN
11
Auto fan settings. It is a manual or auto changeover control
with dual setpoint capability. Other features include a
timed override function, lockable system settings, and
Fahrenheit or Celsius temperature display. Included with
the wireless zone sensor will be a receiver that is to be
mounted inside the unit, a mounting bracket, and a wire
harness.
High Temperature Sensor (BAYFRST001*)
This sensor connects to the RTRM Emergency Stop Input
located on the LTB and provides high limit “shutdown” of
the unit and requires a manual reset.The sensor is used to
detect high temperatures due to fire in the air conditioning
or ventilation ducts. The sensor is designed to mount
directly to the sheet metal duct. Each kit contains two
sensors.The return air duct sensor (X1310004001) is set to
open at 135°F.The supply air duct sensor (X1310004002) is
set to open at 240°F. The control can be reset after the
temperature has been lowered approximately 25°F below
the cutout setpoint.
Evaporator Frost Control
This input incorporates the Frostat™ control (FOS) located
on the indoor coil and can be activated by closing a field
supplied contact installed in parallel with the FOS.
If this circuit is closed before the compressor is started, the
compressor will not be allowed to operate. Anytime this
circuit is closed for 1 continuous second during
compressor operation, the compressor for that circuit is
immediately turned “Off”.The compressor will not be
allowed to restart for a minimum of 3 minutes should the
FOS open.
Frostat™ is standard on multi-speed indoor motors and
single zone VAV products (SZVAV).
Smoke Detector Sensor (Optional)
This sensor is only applicable on units equipped with a
RTOM. It provides high limit “shutdown” of the unit and
requires a manual reset. The sensor is used to detect
smoke due to fire in the air conditioning or ventilation
ducts.
Important:
•
The supply air smoke detector samples supply air.The
return and plenum air smoke detectors sample return
air. The smoke detectors are designed to shut off the
unit if smoke is sensed in the supply air stream or
return air stream. This function is performed by
sampling the airflow entering the unit at the return air
opening. Follow the instructions provided below to
assure that the airflow through the unit is sufficient for
adequate sampling. Failure to follow these instructions
will prevent the smoke detectors from performing it's
design function.
•
Airflow through the unit is affected by the amount of
dirt and debris accumulated on the indoor coil and
filters. To insure that airflow through the unit is
adequate for proper sampling by the return air smoke
detector, complete adherence to the maintenance
procedures, including recommended intervals
between filter changes, and coil cleaning is required.
•
Periodic checks and maintenance procedures must be
performed on the smoke detector to insure that it will
function properly. For detailed instructions concerning
these checks and procedures, refer to the appropriate
section(s) of the smoke detector Installation and
Maintenance Instructions provided with the literature
package for this unit.
In order for the supply air smoke detector or return air
smoke detector to properly sense smoke in the supply air
stream or return air stream, the air velocity entering the
smoke detector unit must be between 500 and 4000 feet
per minute. Equipment covered in this manual will
develop an airflow velocity that falls within these limits
over the entire airflow range specified in the evaporator
fan performance tables.
Phase Monitoring protection
Precedent units with 3-phase power are equipped with
phase monitoring protection as standard. These devices
protect motors and compressors against problems caused
by phase loss, phase imbalance, and phase reversal
indication.
This sensor monitors voltage between the 3 conductors of
the 3 phase power supply. Two LED lights are provided.
The green light indicates that a balanced 3 phase supply
circuit is properly connected. The red light indicates that
unit operation has been prevented. There are two
conditions that will prevent unit operation. The power
supply circuit is not balanced with the proper phase
sequence of L1, L2, L3 for the 3 conductors of a 3 phase
circuit.The line to line voltage is not between 180 volts and
633 volts.
Human Interface - 5 Inch Color Touchscreen
(Optional)
The 5 inch ColorTouchscreen Human Interface provides an
intuitive user interface to the rooftop unit that speeds up
unit commissioning, shortens unit troubleshooting times,
and enhances preventative maintenance measures. The
human interface includes several features including:
•
Data trending capabilities by means of time series
graphs
•
Historical alarm messages
•
Real-time sensor measurements
•
On board system setpoints
•
USB port that enables the downloading of component
runtime information as well as trended historical
sensor data
•
Customized reports
