Temperature And Pressure Relief Valve - A.O. Smith DEL Installation And Operaion Manual

TYPICAL PIPING CONNECTIONS
This page shows typical water heater installations by model designations.
DUAL ELEMENTS HEATER
INSTALL SUITABLE DRAIN PANS UNDER HEATERS TO
PREVENT DAMAGE DUE TO LEAKAGE. REFER TO WATER
HEATER LOCATION ON PAGE 2.
INSTALL THERMAL
EXPANSION TANK IF
CHECK VALVE
PRESSURE REDUCING
VALVE IS USED IN
SUPPLY LINE.

TEMPERATURE AND PRESSURE RELIEF VALVE

TO REDUCE THE RISK OF EXCESSIVE PRESSURES AND
TEMPERATURES IN THIS WATER HEATER, INSTALL
TEMPERATURE AND PRESSURE PROTECTIVE EQUIPMENT
REQUIRED BY LOCAL CODES BUT NOT LESS THAN A
COMBINATION TEMPERATURE AND PRESSURE RELIEF
VALVE CERTIFIED BY A NATIONALLY RECOGNIZED TESTING
LABORATORY THAT MAINTAINS PERIODIC INSPECTION OF
PRODUCTION OF LISTED EQUIPMENT OR MATERIALS, AS
MEETING THE REQUIREMENTS FOR RELIEF VALVE DEVICES
FOR HOT WATER SUPPLY SYSTEMS. (ANSI Z21.22.)
This valve must be marked with a maximum set pressure not to
exceed the marked maximum working pressure of the water
heater. Install the valve into an opening provided and marked for
this purpose in the water heater, and orient it or provide tubing so
INSTALL VACUUM RELIEF
IN COLD WATER INLET
OR LINE AS REQUIRED BY
LOCAL CODES.
CAUTION
SINGLE ELEMENT HEATER
† OVER CURRENT PROTECTION MUST BE SUPPLIED IN WATER HEATER CIRCUIT.
CONSULT LOCAL CODE OR NEC-1984 FOR PROPER INSTALLATION.
* INSTALL IN ACCORDANCE WITH ALL LOCAL CODES.
that any discharge from the valve will exit only within 6 inches
above, or at any distance below, the structural floor and cannot
contact any live electrical part. THE DISCHARGE OPENING
MUST NOT BE BLOCKED OR REDUCED IN SIZE UNDER ANY
CIRCUMSTANCES.
DUAL ELEMENT
RATING PLATE
6
SINGLE ELEMENT
RATING PLATE