NTI COMPACT SERIES Installation And Operation Instructions Manual

Contents

NTI COMPACT SERIES Installation And Operation Instructions Manual Manual pdf 8 page image

Figure BFigure A ConduitJunctionboxcoversWhite wireBlack wireEarth connection(Green wire)Heater can sit on floor.Connect the cold water inlet pipe to the inlet tapping (marked with a blue ring) and the hot water outlet pipe to the outlet tapping(marked with a red ring).The model NTI COMPACT 6 can be piped horizontally from the side or vertically from the top. If you wish to install the unit horiz-ontally, with the piping connections on the right side, you will have to be certain the tap between the two water tappings isplugged, the supplied Temperature and Pressure Relief Valve will need to be installed on top. See location of T&P relief valve in Fig.2/2. If you wish to install the unit vertically, with the piping connections on top, you will have to be certain the tap on the side isplugged, the supplied Temperature and Pressure Relief Valve will need to be installed on top. See location of T&P relief valve inFig. 2/3.To reduce the risk of excessive pressures and temperatures in this water heater, install the supplied temperature and pressureprotective equipment required by local codes but not less than a combination temperature and pressure relief valve certified by anationally recognized testing laboratory that maintains periodic inspection of production of listed equipment or materials, as meetingthe requirements for Relief Valves and Automatic Gas Shut-off Devices for Hot Water Supply Systems, ANSI Z21.22. The suppliedtemperature and pressure relief valve is marked with a maximum set pressure (150 psi) that does not exceed the markedmaximum working pressure of the water heater. Install the valve in the opening provided and marked for this purpose in thewater heater, and orient it or provide tubing so that any discharge from the valve will exit within 6 inches above, or at anydistance below, the structural floor,and cannot contact any live electrical part. The discharge opening must not be blocked orreduced in size under any circumstances.National Plumbing codes require a drain pan for any water heater installation. Failure to install one is the sole responsibility of ownerand/or installer. Reference UPC 2000 (Uniform Plumbing Code) Section 510- Protection from Damage or IPC 2000 (InternationalPlumbing Code) Section 504- Safety Devices.The NTI COMPACT 6 model must be hard wired . As per the National Electric Code the NTI COMPACT 6 needs to be wiredwith 12 GA. wire to a 20 amp branch circuit. Remove the junction box covers and feed wires, see Figure A and B. Insert 12 AWGthrough conduit into junction box and secure with conduit strain relief (not supplied). Make appropriate wiring connections to thewater heater per the National Electric Code. The unit must be grounded with supplied grounding cable inside junction box. Securejunction box cover once wiring connections have been made. When theNTI COMPACT 6 is not within sight of the electrical circuitbreakers, a circuit breaker lockout or additional local means of disconnection for all non grounded conductors must be provided thatis within sight of the appliance. [REF NEC 422.31]Periodic discharge of the temperature and pressure relief valve or failure of the element gasket may be due to thermal expansion ina closed water supply system. The water utility supply meter may contain a check valve, backflow preventer or water pressurereducing valve which will create a closed water system. During the heating cycle of the water heater, the water expands causingpressure inside the water heater to increase. The temperature and pressure relief valve may discharge hot water under theseconditions which results in a loss of energy and a build-up of lime on the relief valve seat.To prevent this from happening, there are two recommendations:1. Install a diaphragm-type expansion tank that is suitable for potable water on the cold water supply line. The expansion tank musthave a minimum capacity of 1.5 U.S. gallons for every 50 gallons of stored water.2. Install a 125 PSI pressure relief valve in the cold water supply line. Make sure the discharge of this valve is directed to an opendrain and protected from freezing. Contact the local water supplier or plumbing inspector for information on how to control thissituation. Do not plug the temperature and pressure relief valve.Floor MountingPipe connectionsCAUTIONElectrical connectionClosed system thermal expansion (for all models)4