ENGINEERING MANUAL OF AUTOMATIC CONTROL
AIR HANDLING SYSTEM CONTROL APPLICATIONS
208
SYMBOLS
The following symbols are used in the system schematics following. These symbols denote the nature of the device, such as a
thermometer for temperature sensing.
13
13
63
ON
AUTO
74
0.45
CONTROLLER, TEMPERATURE
SENSOR, TEMPERATURE
LOW LIMIT
HIGH LIMIT
MANUAL RESET NOTATION
INSERTION TEMPERATURE SENSOR
TEMPERATURE SENSOR,
AVERAGING
TEMPERATURE CONTROLLER,
MANUAL RESET, SAFETY LOW LIMIT
MANUAL MULTI-STATE
COMMAND (ON-OFF-AUTO)
STATUS POINT
VALUE POINT (% LOAD)
COMMANDABLE VALUE
3-WAY VALVE WITH ACTUATOR
2-WAY VALVE WITH ACTUATOR
DAMPER WITH ACTUATOR
SMOKE DETECTOR
(NFPA SYMBOL)
PROPELLER EXHAUST FAN
SOLENOID VALVE
PUMP
FILTER
HEATING COIL
COOLING COIL
PRESSURE SENSOR
PRESSURE CONTROLLER,
HIGH LIMIT CUT-OUT,
MANUAL RESET
FAN
M15150
NORMAL