A.O. Smith ATX-199 Instruction Manual page 16

See Water Line Connections (page 44)
Piping Diagrams (page 66).
SAFETY VALVE REQUIREMENTS
•
storage tank
•
WATER HEATING UNIT PRESSURE-ONLY RELIEF VALVE
ANSI Z21.22 or CAN 1-4.4
Thermal Expansion (page 15)
TEMPERATURE-PRESSURE RELIEF VALVE
Water
NOTE:
16
ANSI Z21.22 • CSA 4.4
ASME.
Explosion Hazard
Temperature-Pressure Relief Valve
must comply with ANSI Z21.22-
CSA 4.4 and ASME code.
Properly sized temperature-
pressure relief valve must be
installed in opening provided.
Can result in overheating and
excessive tank pressure.
Can cause serious injury or death.