General Information
10
RT-SVX26K-EN
Thermostat (BAYSTAT151)
This thermostat is a single-stage 1 heat/1 cool, auto-
changeover digital display thermostat. It is a non-
programmable, wall-mounted thermostat.
Thermostat (BAYSTAT155)
This thermostat is a multi-stage 3 heat/2 cool, auto
changeover digital display thermostat. It is a non-
programmable, wall-mounted thermostat, and it can be
used for Economizer Operation.
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.
Notes:
•
The supply and return air 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.
There are certain models, however, if operated at low
airflow, will not develop an airflow velocity that falls within
the required 500 to 4000 feet per minute range. For these
models, the design airflow shall be greater than or equal
to the minimum cfm specified in the table provided below.
Failure to follow these instructions will prevent the smoke
detector from performing its design function.
Wall Mounted Relative Humidity Sensor
(BAYSENS036*)
Field installed, wall mounted humidity sensor is used to
control activation of the hot gas reheat dehumidification
option.
Humidity set points can be selected for relative humidity
levels between 40 percent and 60 percent by adjusting the
DEHUMID setting on the ReliaTel Options Module; see
“RTOM—ReliaTel™ Options Module (Optional),” p. 7
.
Duct Mounted Relative Humidity Sensor
(BAYSENS037*)
Field installed, duct mounted humidity sensor is used to
control activation of the hot gas reheat dehumidification
option.
Humidity set points can be selected for relative humidity
levels between 40 percent and 60 percent by adjusting the
DEHUMID setting on the ReliaTel Options Module; see
“RTOM—ReliaTel™ Options Module (Optional),” p. 7
.
Human Interface - 5 Inch Color
Touchscreen (Optional)
The 5 inch Color Touchscreen 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
Unit Model
Number
Minimum Allowable Airflow with
Return Air Smoke Detector
YHD180
5300 cfm
