CAUTION !!
For Installing Temperature and Pressure Relief Valves in accordance with American National Std. Z21-22 latest edition. Combination temperature and pressure relief valves with extension thermostats must be installed so that the temperature-sensing element is immersed in the water within the top 6" (152 mm) of the tank. They must be installed either in the hot outlet service line or directly in a tank tapping. Combination temperature and pressure relief valves that do not have extension elements must be mounted directly in a tank tapping located within the top 6" (152 mm) of the tank, and shall be adequately insulated and located so as to assure isolation from flue gas heat or other ambient conditions that are not indicative of stored water temperature. To avoid water damage or scalding due to valve operation, drain pipe must be connected to valve outlet and run to a safe place of disposal. Drain pipe must be as short as possible and be the same size as the valve discharge connection throughout its entire length. Drain line must pitch downward from the valve and terminate at least 6" (152 mm) above the floor drain where any discharge will be clearly visible. The drain line shall terminate plain, not threaded, with a material serviceable for temperatures up to 250ºF (121ºC) or greater. Excessive length, over 15' (4.57m), or use of more than two elbows can cause a restriction and reduce the discharge capacity of the valve. No shut-off valve shall be installed between the relief valve and tank, or in the drain line. Valve lever must be tripped periodically to insure that waterways are clear. This device is designated for emergency safety relief and shall not be used as an operating control. Do not use an antisiphon or check valve on the incoming water line.
CAUTION !!
The valves are set to relieve at 150 psi or when water temperature reaches 210°F (99°C). Read tag on valve for additional information.
PRESSURE REDUCING VALVE
Proper operation of the dishwater rinse nozzles requires available water pressure at the nozzle be between 15 and 25 psi when nozzle is operated. 20 psi is recommended.
If water pressure available to the booster heater inlet is over 20 psi, a pressure reducing valve should be mounted in the hot water supply line to the booster heater.
The pressure reducing valve supplied by the manufacturer has a built-in high pressure by-pass which prevents excessive pressure build- up as the booster heats up.
TEMPERATURE/PRESSURE GAUGES
Manufacturer recommends a temperature/pressure gauge be installed in both the inlet and outlet lines to the booster heater. These gauges provide an instant visual check of the water temperature and pressure entering the booster heater and leaving the heater. The visual check is helpful in eliminating unnecessary service calls.
PLUMBING CONNECTIONS
CAUTION !!
To avoid development of a leak, do not back up or loosen any pipe fittings.
WARNING !!
Do not connect the heater directly to a boiler or furnace coil or any other uncontrolled temperature source. Such hook-up could cause the thermostat to lose control and the unit could overheat.
WARNING:
INLET
Connect the booster heater water inlet to a hot water supply line from the regular water heater. Water temperature from the regular water heater should be 100°F or 140°F (52°C or 60°C) and should not exceed 160°F (71°C). Minimum temperature differential between inlet and outlet temperatures should never be less than 20°F (11°C). Provide the inlet line with a shut-off valve, a full open gate or ball type valve, together with a pressure reducing valve. Set pressure reducing valve at 20 psi (1.4 kg/cm2) flow pressure.
NOTE:
Be sure water flows through the pressure reducing valve in the proper direction. Check directional arrow. Valve will reduce pressure only during flow conditions.
A 3/4 in. union fitting and a drain valve are needed for easy servicing.
