13
For protection against excessive temperature and pressure, install temperature and pressure protective
equipment required by local codes. This equipment must be certified by a nationally recognized testing
laboratory that maintains periodic inspection of production of listed equipment or materials to meet the
requirements for Relief Valves and Automatic Gas Shut-Off Devices for Hot Water Supply Systems, ANSI
Z21.22.
The temperature and pressure relief valve (T&P valve) must be marked with a maximum set pressure not
to exceed the maximum working pressure of the water heater. The T&P valve must also have an hourly
rated temperature steam BTU discharge capacity not less than the hourly rating of the water heater.
Install the T&P valve into the opening provided and marked for this purpose on the water heater.
Next, install a drainpipe in the valve opening. This drainpipe should terminate near the floor drain or a
similarly suitable drainage location, so that any discharge will exit within 6 inches above or at any
distance below the structural floor, and will not contact any live electrical part. It is recommended that a
minimum clearance
of 3” be provided on the side of the water heater for servicing and maintenance of the
T&P valve.
NOTE: Do not subject the discharge opening to blocking or freezing or reduce its size under any
circumstances.
PART 11: OIL LINE CONNECTIONS
A. SINGLE LINE SYSTEM
NOTE: NOT RECOMMENDED WHEN IT IS NECESSARY TO LIFT THE OIL.
This type of installation is used where the oil storage tank is above the burner and a gravity oil feed is
permitted. The oil outlet and line should draw from the bottom of the tank. This line should have a gradual
slope of approximately 1/12" per linear foot or more downward to a point directly below where it is
connected to the burner. A shut-off valve should be installed in the line.
B. TWO LINE SYSTEM
If oil storage is buried, or if a suction line is long, it is recommended that a two-stage fuel unit with two
lines (suction and return) be installed.
Note:
For Suntec (Sunstrand) fuel units, insert the bypass plug through the return port and turn tight. For
Webster pumps, by-pass plugs come installed.
C. SUCTION LINE
It is recommended that extra heavy wall copper tubing be used for this line. If standard wrought iron pipe
is used it should be scale free and not smaller than 5/8" OD. Copper tubing should be installed to connect
the pipe to the fuel unit. Where tubing is used, one complete loop should connect the pipe to the fuel unit.
Also, one complete tubing loop should be made immediately below the fitting connecting it to the oil pump
in order to reduce transmission of noise and prevent strain on the burner.
When the top of the oil storage tank is below the level of the fuel unit, high points or air pockets in the
suction line must be avoided. A 5/8" OD ball check valve should be installed to prevent the return of the