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ASHRAE STANDARDASHRAE STANDARD
American Society of Heating, Refrigeratingand Air-Conditioning Engineers, Inc.
1791 Tullie Circle NE, Atlanta, GA 30329www.ashrae.org
Graphic Symbols forHeating, Ventilating,Air-Conditioning, andRefrigerating Systems
ANSI/ASHRAE Standard 134-2005
Approved by the ASHRAE Standards Committee on February 9, 2005; by the ASHRAE Board of Directors onFebruary 10, 2005; and by the American National Standards Institute on February 10, 2005.
This standard is under continuous maintenance by a Standing Standard Project Committee (SSPC) for which theStandards Committee has established a documented program for regular publication of addenda or revisions,including procedures for timely, documented, consensus action on requests for change to any part of the stan-dard. The change submittal form, instructions, and deadlines may be obtained in electronic form from the ASHRAEWeb site, http://www.ashrae.org, or in paper form from the Manager of Standards. The latest edition of an ASHRAEStandard may be purchased from ASHRAE Customer Service, 1791 Tullie Circle, NE, Atlanta, GA 30329-2305.E-mail: orders@ashrae.org. Fax: 404-321-5478. Telephone: 404-636-8400 (worldwide), or toll free 1-800-527-4723 (for orders in U.S. and Canada).
© Copyright 2005 ASHRAE, Inc.
ISSN 1041-2336
THIS DOCUMENT MAY BE COPIED AND DISTRIBUTED ONLY FOR HANDBOOK DEVELOPMENT
BY HANDBOOK SUBCOMMITTEE MEMBERS OF TC1.4
CONTENTS
ANSI/ASHRAE Standard 134-2005Graphic Symbols for Heating, Ventilating, Air-Conditioning, and Refrigerating Systems
SECTION PAGE
4 Symbols
Table 2-1 Linecodes..................................................................................................................................... 42
Table 2-3 Valves .......................................................................................................................................... 51
Table 3-1 Thermostats & Controllers ........................................................................................................... 63
Table 3-2 Sensors & Transmitters................................................................................................................ 67
Table 3-3 Actuators ...................................................................................................................................... 70
Table 3-4 Auxiliary Devices.......................................................................................................................... 71
Table 3-5 Accessories.................................................................................................................................. 75
Table 3-6 Lines............................................................................................................................................. 76
Table 4 Equipment Symbols ........................................................................................................................ 77
NOTE: THE RIGHT HAND COLUMN OF EACH SYMBOLS PAGE IS LABELED "FILENAME".
THE FILENAME, WHICH IS FOR REFERENCING PURPOSES, GENERALLY FOLLOWS THE CSI
NUMBERING SYSTEM
42 ANSI/ASHRAE STANDARD 134-2005
PIPING SYMBOLS
TABLE 2-1 LINECODES
SYMBOL DESCRIPTION FILENAME
PIPING SERVICE
SEE EXAMPLES, PAGES 44-49
P15010.001
PIPING SERVICE, SUPPLY P15010.002
PIPING SERVICE, RETURN P15010.003
PIPING SERVICE WITH
DETAIL INFORMATION
P15010.004
DASHED LINE FOR HIDDEN OR
UNDERGROUND PIPING WITH
DETAIL
P15010.005
PIPING SERVICE, EXISTING P15010.006
VENT P15010.007
PIPING, HEAT TRACED P15010.008
ANSI/ASHRAE STANDARD 134-2005 43-
PIPING SYMBOLS
TABLE 2-1 LINECODES
continued
SYMBOL DESCRIPTION FILENAME
PIPING PITCH (%, MM/M OR IN/FT)
P15010.009
PIPING PITCH (%, MM/M OR IN/FT)
(ALTERNATE)
P15010.010
PIPING FLOW DIRECTION P15010.011
44 ANSI/ASHRAE STANDARD 134-2005
PIPING SYMBOLS
TABLE 2-1 LINECODES
continued
PIPING SERVICE NAMES DESCRIPTION FILENAME
DOMESTIC COLD WATER P15411.001
P15411.002
DOMESTIC HOT WATER P15411.003
P15411.004
DOMESTIC HOT WATER RETURN P15411.005
P15411.006
SANITARY WASTE P15420.001
ACID WASTE P15420.002
ANSI/ASHRAE STANDARD 134-2005 45-
PIPING SYMBOLS
TABLE 2-1 LINECODES
continued
PIPING SERVICE NAMES DESCRIPTION FILENAME
ACID VENT
P15420.003
STORM DRAIN P15420.004
COMPRESSED AIR
WITH DETAIL INFORMATION
(EXAMPLES: PLANT, DRY, PURE, ETC.)
P15481.001
VACUUM SERVICE P15481.002
FUEL OIL WITH DETAIL INFORMATION
(EXAMPLES: SUPPLY, RETURN, FILL, VENT)
P15484.001
GAS P15488.001
46 ANSI/ASHRAE STANDARD 134-2005
PIPING SYMBOLS
TABLE 2-1 LINECODES
continued
PIPING SERVICE NAMES DESCRIPTION FILENAME
HOT WATER SUPPLY (HEATING) P15512.001
HOT WATER RETURN (HEATING) P15512.002
CHILLED WATER SUPPLY P15512.003
CHILLED WATER RETURN P15512.004
DRAINP15512.005
DUAL TEMPERATURE SUPPLY
( HOT OR CHILLED WATER )
P15512.006
DUAL TEMPERATURE RETURN
( HOT OR CHILLED WATER )
P15512.007
ANSI/ASHRAE STANDARD 134-2005 47-
PIPING SYMBOLS
TABLE 2-1 LINECODES
continued
PIPING SERVICE NAMES DESCRIPTION FILENAME
GLYCOL SUPPLY P15512.008
GLYCOL RETURN P15512.009
CONDENSER WATER SUPPLY P15512.010
CONDENSER WATER RETURN P15512.011
COOLING TOWER WATER SUPPLY P15512.012
COOLING TOWER WATER RETURN P15512.013
HEAT PUMP WATER SUPPLY P15512.014
HEAT PUMP WATER RETURN P15512.015
NON-POTABLE WATER P15512.016
48 ANSI/ASHRAE STANDARD 134-2005
PIPING SYMBOLS
TABLE 2-1 LINECODES
continued
PIPING SERVICE NAMES DESCRIPTION FILENAME
STEAM WITH PRESSURE INDICATED
(kPa OR PSIG)
P15520.001
HIGH PRESSURE STEAM P15520.002
MEDIUM PRESSURE STEAM P15520.003
LOW PRESSURE STEAM P15520.004
CLEAN MEDIUM PRESSURE STEAM P15520.005
CLEAN LOW PRESSURE STEAM P15520.006
HIGH PRESSURE STEAM CONDENSATE P15520.007
MEDIUM PRESSURE STEAM CONDENSATE P15520.008
LOW PRESSURE STEAM CONDENSATE P15520.009
ANSI/ASHRAE STANDARD 134-2005 49-
PIPING SYMBOLS
TABLE 2-1 LINECODES
concluded
PIPING SERVICE NAMES DESCRIPTION FILENAME
PUMPED CONDENSATE P15520.010
BOILER BLOW DOWN
P15520.011
BOILER FEED WATER P15520.012
REFRIGERANT DISCHARGE (HOT GAS) P15535.001
REFRIGERANT SUCTION P15535.002
REFRIGERANT LIQUID P15535.003
REFRIGERANT LIQUID OVERFEED RETURN P15535.004
ANSI/ASHRAE STANDARD 134-2005 51-
PIPING SYMBOLS
TABLE 2-3 VALVES
SYMBOL DESCRIPTION FILENAME
GATE VALVE P15100.001
BALL VALVE P15100.002
BUTTERFLY VALVE P15100.003
GLOBE VALVE P15100.004
ANGLE (GLOBE) VALVE P15100.005
PLUG VALVE P15100.006
PINCH VALVE P15100.007
THREE-WAY VALVE P15100.008
NEEDLE VALVE P15100.009
52 ANSI/ASHRAE STANDARD 134-2005
PIPING SYMBOLS
TABLE 2-3 VALVES
continued
SYMBOL DESCRIPTION FILENAME
SHUTOFF COCK P15100.010
CHECK VALVE
P15100.011
CHECK VALVE, SPRING LOADED P15100.012
MULTI-PURPOSE VALVE
(SHUTOFF, BALANCING AND CHECK)
P15100.013
ANGLE MULTI-PURPOSE VALVE
(SHUTOFF, BALANCING AND CHECK)
P15100.014
ANGLE STOP AND CHECK VALVE P15100.015
FLOW MEASURING AND BALANCING
VALVE
P15100.016
DIFFERENTIAL PRESSURE-REDUCING
REGULATOR
P15100.017
PRESSURE-REDUCING REGULATOR P15100.018
ANSI/ASHRAE STANDARD 134-2005 53-
PIPING SYMBOLS
TABLE 2-3 VALVES
continued
SYMBOL DESCRIPTION FILENAME
PRESSURE REGULATOR P15100.019
SAFETY OR RELIEF VALVE
P15100.020
FOOT VALVE P15100.021
QUICK OPENING VALVE
(USED FOR BLOW DOWN)
P15100.022
QUICK CLOSING VALVE P15100.023
HOSE BIBB VALVE P15100.024
GLOBE VALVE, ACTUATOR WITH
CAPILLARY TUBE AND BULB
P15100.025
REFRIGERANT THERMOSTATIC EXPANSION
VALVE
P15100.026
REFRIGERANT LOWSIDE FLOAT VALVE
P15100.027
54 ANSI/ASHRAE STANDARD 134-2005
PIPING SYMBOLS
TABLE 2-3 VALVES
continued
SYMBOL DESCRIPTION FILENAME
REFRIGERANT LIQUID DRAIN VALVE P15100.028
GENERAL SYMBOL FOR SPECIAL VALVES P15100.029
SPECIAL VALVE WITH TAG NUMBER
P15100.030
REDUCED PRESSURE ZONE
BACKFLOW PREVENTER
P15100.031
DOUBLE CHECK BACKFLOW PREVENTER P15100.032
VACUUM BREAKER P15100.033
FLOW REGULATOR & FLOW LIMITING
VALVE
P15100.034
INVERTED BUCKET STEAM TRAP P15100.035
FLOAT & THERMOSTATIC STEAM TRAP P15100.036
THERMOSTATIC STEAM TRAP,
BIMETALLIC AND BELLOWS
P15100.037
ANSI/ASHRAE STANDARD 134-2005 55-
PIPING SYMBOLS
TABLE 2-3 VALVES
concluded
SYMBOL DESCRIPTION FILENAME
THERMODYNAMIC (DISK) STEAM TRAP P15100.038
VARIABLE ORIFICE (PISTON) STEAM TRAP
P15100.039
SIGHT GLASS, FLOW P15100.040
FIXED ORIFICE STEAM TRAP P15100.041
ANSI/ASHRAE STANDARD 134-2005 63-
CONTROL SYMBOLS
TABLE 3-1 THERMOSTATS & CONTROLLERS
SYMBOL DEFINITION
AND
BASIC CONSTRUCTION
SYMBOL DESCRIPTION FILENAME
THERMOSTAT, WALL MOUNTED C15970.001
THERMOSTAT, DUCT MOUNTED,
AVERAGING
C15970.002
THERMOSTAT, REMOTE BULB C15970.003
THERMOSTAT, REMOTE BULB IN WELL C15970.004
THERMOSTAT, DUCT MOUNTED,
LOW LIMIT, MANUALLY RESET
C15970.005
THERMOSTAT, HIGH LIMIT
(FIRE PROTECTION), MANUALLY RESET
C15970.006
THERMOSTAT, NIGHT C15970.007
THERMOSTAT, WET BULB C15970.008
64 ANSI/ASHRAE STANDARD 134-2005
CONTROL SYMBOLS
TABLE 3-1 THERMOSTATS & CONTROLLERS
continued
SYMBOL DESCRIPTION FILENAME
THERMOSTAT, DEW POINT C15970.009
PIPE THERMOSTAT, WELL MOUNTED C15970.010
PIPE THERMOSTAT, STRAP-ON (SURFACE) C15970.011
CONTROLLER, HUMIDITY, WALL MOUNTED C15970.012
CONTROLLER, HUMIDITY, DUCT MOUNTED C15970.013
CONTROLLER, TEMPERATURE & HUMIDITY C15970.014
CONTROLLER, ENTHALPY C15970.015
CONTROLLER, LEVEL C15970.016
CONTROLLER, SILICON CONTROLLED
RECTIFIER (SCR)
C15970.017
ANSI/ASHRAE STANDARD 134-2005 65-
CONTROL SYMBOLS
TABLE 3-1 THERMOSTATS & CONTROLLERS
continued
SYMBOL DESCRIPTION FILENAME
CONTROLLER, ADJUSTABLE (VARIABLE)
SPEED DRIVE
C15970.018
CONTROLLER, 3 TO 5 POINTS, WHERE
B: BRANCH OUTPUT
M: MAIN POWER
I: PRIMARY INPUT
R: RESET INPUT (OPTIONAL)
C: CONTROL POINT ADJUST (OPTIONAL)
(X) DA: DIRECT ACTING, OR
RA: REVERSE ACTING
(Y) P: PROPORTIONAL CONTROL,
PI: P + INTEGRAL CONTROL, OR
PID: P + I + DERIVATIVE CONTROL
EXAMPLE 1:
DA: DIRECT ACTING
P: PROPORTIONAL CONTROL
EXAMPLE 2:
RA: REVERSE ACTING
PI: PROPORTIONAL + INTEGRAL
CONTROL
C15970.019
CONTROLLER, PRESSURE C15970.020
CONTROLLER, DIFFERENTIAL PRESSURE C15970.021
CONTROLLER, PROPORTIONAL, MANUAL C15970.022
66 ANSI/ASHRAE STANDARD 134-2005
CONTROL SYMBOLS
TABLE 3-1 THERMOSTATS & CONTROLLERS
concluded
SYMBOL DESCRIPTION FILENAME
CONTROLLER, WHERE ACRONYM
DENOTES CONTROLLED GAS, SUCH AS “CO”
FOR CARBON MONOXIDE AND “CO2” FOR
CARBON DIOXIDE.
C15970.023
CONTROL PANEL C15970.024
MICROPROCESSOR CONTROL PANEL C15970.025
UNIT (PACKAGED UNITS, TERMINAL
BOXES) CONTROL MODULE
C15970.026
CONTROLLER, DUAL FUNCTION AND/OR
DEADBAND
C15970.027
ANSI/ASHRAE STANDARD 134-2005 67-
CONTROL SYMBOLS
TABLE 3-2 SENSORS & TRANSMITTERS
SYMBOL
SENSOR OR TRANSMITTER
SYMBOL DESCRIPTION FILENAME
TEMPERATURE SENSOR OR TRANSMITTER,
WALL MOUNTED
C15972.001
TEMPERATURE SENSOR OR TRANSMITTER,
POINT SENSING
C15972.002
TEMPERATURE SENSOR OR TRANSMITTER,
AVERAGING, DUCT MOUNTED
C15972.003
TEMPERATURE SENSOR OR TRANSMITTER C15972.004
WET-BULB TEMPERATURE SENSOR OR
TRANSMITTER
C15972.005
DEW-POINT TEMPERATURE SENSOR OR
TRANSMITTER
C15972.006
CARBON MONOXIDE SENSOR OR
TRANSMITTER
C15972.007
CARBON DIOXIDE SENSOR OR
TRANSMITTER
C15972.008
OXYGEN SENSOR OR TRANSMITTER C15972.009
68 ANSI/ASHRAE STANDARD 134-2005
CONTROL SYMBOLS
TABLE 3-2 SENSORS & TRANSMITTERS
continued
SYMBOL DESCRIPTION FILENAME
REFRIGERANT GAS SENSOR OR
TRANSMITTER
C15972.010
PIPE TEMPERATURE SENSOR OR
TRANSMITTER, WELL MOUNTED
C15972.011
HUMIDITY SENSOR OR TRANSMITTER,
DUCT MOUNTED
C15972.012
HUMIDITY SENSOR OR TRANSMITTER,
WALL MOUNTED
C15972.013
PRESSURE SENSOR OR TRANSMITTER C15972.014
DIFFERENTIAL PRESSURE SENSOR OR
TRANSMITTER
C15972.015
LEVEL SENSOR OR TRANSMITTER C15972.016
AMPERAGE SENSOR, CURRENT
TRANSMITTER
C15972.017
ELECTRIC-PNEUMATIC TRANSDUCER C15972.018
ANSI/ASHRAE STANDARD 134-2005 69-
CONTROL SYMBOLS
TABLE 3-2 SENSORS & TRANSMITTERS
concluded
SYMBOL DESCRIPTION FILENAME
KILOWATT TRANSDUCER C15972.019
VOLTAGE TRANSDUCER C15972.020
70 ANSI/ASHRAE STANDARD 134-2005
CONTROL SYMBOLS
TABLE 3-3 ACTUATORS
SYMBOL DESCRIPTION FILENAME
PNEUMATIC DIAPHRAGM, SPRING OPPOSED C15974.001
PNEUMATIC DIAPHRAGM,
SPRING OPPOSED, WITH POSITIONER
C15974.002
PNEUMATIC CYLINDER
C15974.003
PNEUMATIC CYLINDER WITH POSITIONER C15974.004
ELECTRIC MOTOR C15974.005
ELECTROHYDRAULIC
C15974.006
SOLENOID C15974.007
ANSI/ASHRAE STANDARD 134-2005 71-
CONTROL SYMBOLS
TABLE 3-4 AUXILIARY DEVICES
SYMBOL DESCRIPTION FILENAME
ELECTRIC-PNEUMATIC TRANSDUCER C15960.001
MANUAL OR SETPOINT ADJUSTMENT
SWITCH (ANALOG)
C15960.002
MINIMUM POSITION SWITCH C15960.003
TWO POSITION SWITCH (OPEN-CLOSED) C15960.004
SINGLE POLE-DOUBLE THROW SWITCH C15960.005
THREE POSITION SWITCH C15960.006
HAND OFF AUTO SWITCH C15960.007
INTERVAL TIMER SWITCH
(OVERRIDE OR TEMPORARY OPERATION)
C15960.008
FLOW SWITCH C15960.009
END SWITCH C15960.010
72 ANSI/ASHRAE STANDARD 134-2005
CONTROL SYMBOLS
TABLE 3-4 AUXILIARY DEVICES
continued
SYMBOL DESCRIPTION FILENAME
SMOKE DETECTOR C15960.011
SMOKE DETECTOR, DUCT MOUNTED C15960.012
TIME DELAY RELAY
(X) DELAY IN SECONDS
(Y) (B): DELAY ON BREAK
(M): DELAY ON MAKE
EXAMPLE 1:
10 SECOND DELAY
(B): DELAY ON BREAK
EXAMPLE 2:
0 TO 60 SECOND DELAY RANGE
(M): DELAY ON MAKE
C15960.013
RELAY, WHERE (X) DENOTES ACTION:
NO: SINGLE POLE, NORMALLY OPEN
NC: SINGLE POLE, NORMALLY
CLOSED
DT: SINGLE POLE, DOUBLE THROW
DPNO: DOUBLE POLE, NORMALLY OPEN
DPNC: DOUBLE POLE, NORMALLY CLOSED
DPDT: DOUBLE POLE, DOUBLE THROW
EXAMPLE 1:
NO: SINGLE POLE, NORMALLY OPEN
EXAMPLE 2:
DPDT: DOUBLE POLE, DOUBLE THROW
C15960.014
ANSI/ASHRAE STANDARD 134-2005 73-
CONTROL SYMBOLS
TABLE 3-4 AUXILIARY DEVICES
continued
SYMBOL DESCRIPTION FILENAME
VOLTAGE TRANSFORMER, STEP-DOWN C15960.015
TIME CLOCK C15960.016
DUAL CHANNEL TIME CLOCK C15960.017
REPEATER, COMMUNICATIONS C15960.018
TELEPHONE OUTLET C15960.019
TELEPHONE MODEM C15960.020
FIBER OPTIC TO CABLE MODEM C15960.021
PULSE-WIDTH MODULATION DRIVER C15960.022
LIGHTNING ARRESTOR C15960.023
74 ANSI/ASHRAE STANDARD 134-2005
CONTROL SYMBOLS
TABLE 3-4 AUXILIARY DEVICES
concluded
SYMBOL DESCRIPTION FILENAME
MOTOR STARTER, MANUAL C15960.024
MOTOR STARTER, MAGNETIC ACROSS-THE-
LINE WITH DISCONNECT SWITCH
C15960.025
MOTOR STARTER,
MAGNETIC ACROSS-THE-LINE
C15960.026
DISCONNECT SWITCH C15960.027
DISCONNECT SWITCH, FUSED C15960.028
CONTACTOR, THREE POLE C15960.029
MOMENTARY PUSH BUTTON C15960.030
MAINTAINED CONTACT PUSH BUTTON C15960.031
PNEUMATIC LINE RESTRICTOR C15960.032
ANSI/ASHRAE STANDARD 134-2005 75-
CONTROL SYMBOLS
TABLE 3-5 ACCESSORIES
SYMBOL DESCRIPTION FILENAME
PRESSURE INDICATOR C15964.001
AIR COMPRESSOR C15964.002
AIR DRYER C15964.003
MOISTURE TRAP C15964.004
COMPRESSED AIR FILTER C15964.005
76 ANSI/ASHRAE STANDARD 134-2005
CONTROL SYMBOLS
TABLE 3-6 LINES
SYMBOL DESCRIPTION FILENAME
PNEUMATIC, INSTRUMENT SUPPLY C15986.001
PNEUMATIC CONTROL
(OPTIONAL: SLASHES DENOTE
NUMBER OF TUBES)
C15986.002
ELECTRIC
(OPTIONAL: SLASHES DENOTE
NUMBER OF CONDUCTORS)
C15986.003
MAIN AIR
(PRESSURE LEVEL MAY BE ADDED
AS NOTED [ kPa (PSIG) ])
C15986.004
SOURCE AIR
(PRESSURE LEVEL MAY BE ADDED
AS NOTED [ kPa (PSIG) ])
C15986.005
EP (ELECTRIC PNEUMATIC) AIR
(MAIN AIR SWITCHED BY AN ELECTRIC
PNEUMATIC RELAY)
C15986.006
DAY-NIGHT AIR
(AIR THAT VARIES BETWEEN DAY AND
NIGHT CYCLES)
C15986.007
SUMMER-WINTER AIR
(AIR THAT VARIES BETWEEN SUMMER AND
WINTER CYCLES)
C15986.008
INSTRUMENT AIR
(PRESSURE LEVEL MAY BE ADDED
AS NOTED [ kPa (PSIG) ])
C15986.009
PLANT AIR
(PRESSURE LEVEL MAY BE ADDED
AS NOTED [ kPa (PSIG) ])
C15986.010
LINE DESIGNATORS:
ANSI/ASHRAE STANDARD 134-2005 77-
EQUIPMENT SYMBOLS
TABLE 4
SYMBOL DESCRIPTION FILENAME
PUMP E15540.001
CHILLER E15680.001
COOLING TOWER E15710.001
HEAT EXCHANGER, SHELL & TUBE E15755.001
HEAT EXCHANGER, PLATE E15755.002
COOLING COIL E15790.001
HEATING COIL E15790.002
ELECTRIC COIL E15790.003
HUMIDIFIER E15810.001
78 ANSI/ASHRAE STANDARD 134-2005
EQUIPMENT SYMBOLS
TABLE 4
continued
SYMBOL DESCRIPTION FILENAME
UNIT HEATER E15830.001
CENTRIFUGAL FAN E15860.001
CENTRIFUGAL FAN
WITH VARIABLE INLET VANES
E15860.002
VANEAXIAL FAN E15865.001
VANEAXIAL FAN, VARIABLE PITCH E15865.002
PROPELLER FAN E15865.003
FILTER E15885.001
AIRFLOW STATION E15910.101
AIRFLOW STATION
WITH FLOW STRAIGHTENER
E15910.102
ANSI/ASHRAE STANDARD 134-2005 79-
EQUIPMENT SYMBOLS
TABLE 4
concluded
SYMBOL DESCRIPTION FILENAME
DAMPER, OPPOSED BLADE E15910.103
DAMPER, PARALLEL BLADE E15910.104
LOUVER E15910.105
ROOF VENTILATOR, INTAKE E15910.106
ROOF VENTILATOR, EXHAUST E15910.107
RADIANT PANEL, HEATING OR COOLING E15910.108
FINNED TUBE RADIATION E15910.109
EQUIPMENT NAME
EXAMPLES:
BOILER . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
WSHP (WATER SOURCE HEAT PUMP) . . .
E15560.001
E15855.001
Recommended