HTP EV-80 - Manual (Page 7)

7
LP-04 REV. 4.15.14
PART 3 – HEATER PIPING
A. PLUMBING
It is mandatory that all plumbing be done in accordance with federal, local, and state plumbing codes and practices. Failure to properly
install the water heater WILL VOID the warranty. It is also necessary to use both thread tape and pipe dope on all mechanical plumbing
connections.
Use unions on the hot and cold water connections and the relief valve discharge line, so that the heater may be easily disconnected for
servicing when necessary.
Use two wrenches when tightening water piping at the heater. Use one wrench to prevent the heater return and supply lines from
turning. Failure to prevent piping connection from turning could cause damage to heater components.
Dielectric unions or galvanized steel fittings must not be used in a system with this water heater. Use only copper or brass fittings.
Teflon thread sealant must be used on all connections.
1. Connect the cold water supply line to the connection marked “COLD” near bottom of heater. Refer to “Typical Installation”, Figure 3.
2. Install a shut-off valve and a drain valve (field supplied, not supplied with the heater) in the cold water line near the heater.
3. Connect hot water line to the connection marked “HOT” on side near the top of the heater.
4. An opening is provided near the top of the heater for installation of a Temperature and Pressure Relief Valve (T&P Valve).
B. TEMPERATURE AND PRESSURE RELIEF VALVE
NOTE: For protection against excessive pressures and temperatures in this water heater, install temperature and pressure protective
equipment as required by local codes, but not less than a combination T&P valve meeting the requirements for Relief Valves and
Automatic Gas Shutoff Devices for Hot Water Supply Systems, ANSI Z21.22B / CSA 4.4-M99, by a nationally recognized testing
laboratory that maintains periodic inspection of production of listed equipment and materials.
Install the T&P valve into the opening provided and marked for this purpose on the water heater so that discharge water from the valve
will not come in contact with any live electrical parts.
Do not thread a cap or plug into the relief valve under any circumstances! Explosion and property damage, serious injury, or death may
result.
To avoid water damage or scalding due to relief valve operation:

Discharge line must be connected to relief valve outlet and run to a safe place of disposal. Terminate the discharge line in a
manner that will prevent possibility of severe burns or property damage should the relief valve discharge.

Discharge line must be as short as possible and the same size as the valve discharge connection throughout its entire length.
 Discharge line must pitch downward from the valve and terminate at least 6” above the floor drain, making discharge clearly
visible.

The discharge line shall terminate plain, not threaded, with a material serviceable for temperatures of 375
o
F or greater.

Do not pipe discharge to any location where freezing could occur.

No shutoff valve may be installed between the relief valve and heater or in the discharge line. Do not plug or place any
obstruction in the discharge line.

Test the operation of the relief valve after filling and pressurizing the system by lifting the lever. Make sure the valve
discharges freely. If the valve fails to operate correctly, immediately replace with a new properly rated relief valve.
 Test T&P valve at least once annually to ensure the waterway is clear. If valve does not operate, turn the heater “off” and call
a plumber immediately.

Take care whenever operating relief valve to avoid scalding injury or property damage.
FAILURE TO COMPLY WITH THE ABOVE GUIDELINES COULD RESULT IN FAILURE OF RELIEF VALVE OPERATION,
RESULTING IN POSSIBILITY OF SUBSTANTIAL PROPERTY DAMAGE, SEVERE PERSONAL INJURY, OR DEATH.