SINGLE TEMPERATURE | MIXING VALVE APPLICATION FOR TWO TEMPERATURE WATER |
WARNING
TEMPERATURE SETTING SHOULD NOT EXCEED SAFE USE
TEMPERATURE AT FIXTURES. SEE TEMPERATURE REGULATION
ON PAGE 9. IF HIGHER PREHEAT TEMPERATURES ARE
NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN
CIRCULATING RETURN LINE CONNECTIONS
TEMPERED WATER LOOP, IF USED, CONNECT TO POINT "A". STORED
TEMPERATURE WATER LOOP, IF USED, CONNECT TO COLD WATER INLET
CAUTION: IF BUILDING COLD WATER SUPPLY HAS A
PREVENTER, CHECK VALVE OR WATER METER WITH CHECK VALVE,
PROVISIONS FOR THERMAL EXPANSION OF WATER IN THE HOT WATER
SYSTEM MUST BE PROVIDED.
FIGURE2
CLOSED WATER SYSTEM | VENTING |
A closed system will exist if a
If the temperature and pressure relief valve on the appliance discharges periodically, this may be due to thermal expansion in a closed water supply system. Contact the water supplier or local plumbing inspector on how to correct situation. DO NOT PLUG THE TEMPERATURE AND PRESSURERELIEFVALVE.
RELIEF VALVE
ANEWTEMPERATUREANDPRESSURERELIEFVALVECOMPLYINGWITH THESTANDARDFORRELIEFVALVESANDAUTOMATICGASSHUTOFF DEVICES FOR HOT WATER SUPPLY SYSTEMS, ANSI Z21.22 (LATEST EDITION)MUSTBEINSTALLEDINTHEHEATERINTHEMARKEDOPENING PROVIDED. THE VALVE MUST BE OF A SIZE (INPUT RATING) THAT WILL BE ADEQUATE FOR YOUR SIZE HEATER.
Check the metal tag on the relief valve and compare it to the heater’s rating plate. The pressure rating of relief valve must not exceed the working pressure shown on the rating plate of the heater. In addition the hourly Btu rated temperature steam discharge capacity of the relief valve shall not be less than the input rating of the heater. NO VALVE IS TOBEPLACEDBETWEENTHERELIEFVALVEANDTANK. DONOTPLUG THE RELIEF VALVE.
The drain line connected to this valve must not contain a reducing coupling or other restriction and must terminate near a suitable drain to prevent water damage during valve operation. The discharge line shall be installed in a manner to allow complete drainage of both the valve and line. DO NOTTHREAD,PLUGORCAPTHEENDOFTHEDRAINLINE.
WARNING
THEINSTRUCTIONSINTHISSECTIONONVENTINGMUSTBEFOLLOWED TOAVOIDCHOKEDCOMBUSTIONORRECIRCULATIONOFFLUEGASES. SUCH CONDITIONS CAUSE SOOTING OR RISKS OF FIRE AND ASPHYXIATION.NEVEROPERATETHEHEATERUNLESSITISVENTED TOTHEOUTDOORSANDHASADEQUATEAIRSUPPLYTOAVOIDRISKS OFIMPROPEROPERATION,FIRE,EXPLOSIONORASPHYXIATION.
VENT PIPE TERMINATION
The first step is to determine where the vent pipe will terminate. The vent may terminate through the roof (see Figure 9) or through a sidewall (see Figure 8).
IMPORTANT
The vent system must terminate so that proper clearances are maintained as cited in local codes or the latest edition of the National Fuel Gas Code, ANSI Z223.1, 7.3.4e and 7.8a, b.
For your convenience instructions on proper installation through a sidewall are provide in Figure 3 and the numbered points below:
1.The exit terminals of a mechanical vent system shall be not less than 7 feet above grade when located adjacent to public walkways.
2.A venting system shall terminate at least 3 feet above any forced air inlet located within 10 feet.
3.The venting system shall terminate at least 4 feet below, 4 feet horizontally from or, 1 foot above any door, window or gravity air inlet into any building.
4.The manufacturer also recommends that the vent system termination not be installed closer than 3 feet from an inside corner of an L shaped structure and not be less than 1 foot above grade. The vent shall terminate a minimum of 12'' above expected snowfall level to prevent blockage of vent termination.
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