RT-SVX075A-EN
11
Touch Screen Programmable Zone
Sensor (BAYSENS800)
This sensor uses a BACnet® MS/TP link to communicate
zone temperature and setpoints. Sensor includes Auto,
Heat, Cool, or Off system switch, as well as Fan Auto or On
switch. This is a seven day programmable thermostat with
night setback.
Notes:
•
Not compatible with VAV units. Requires
BACnet® communications.
•
For additional sensors, refer to the product
catalog.
Note:
BASYSENS800* with BACnet® enabled on the
Symbio™ controller will report fault detection and
diagnostics at the zone sensor. This functionality is
only applicable if the customer does not have a
building management system, and the unit is
running standalone with the BAYSENS800.
Evaporator Frost Control
Frostat is standard on all units.
Discharge Line Temp Switch
(DLTS)
The DLTS is looped in series with HPC and LPC. It
prevents the compressor from overheating (over 300°F
dome temp) in case of indoor fan failure (cooling) or
outdoor fan failure (heating).
Smoke Detector Sensor
(Optional)
This sensor provides high limit “shutdown” of the unit and
requires a manual reset. The sensor is used to detect
smoke in the air conditioning or ventilation ducts.
Notes:
•
The supply air smoke detector samples supply
air. The return smoke detectors sample return
air. The smoke detectors are designed to shut
off the unit if smoke is sensed. 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 its 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 Monitor
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.
Summary of Contents for Precedent YHJ072A
Page 67: ...RT SVX075A EN 67 Notes...
