blockthedischargeopeningorhinderaccesstothemanual relieflever(Figure9). Ensureadischargepipeisinstalled intotheT&Pvalvedischargeopeningpertheinstructions thismanual.
4.Locatethehotwater(outlet)&coldwater(inlet)pipestothe
waterheater.
5.Locatetheslit runningthelengthof a sectionof pipe insulation.
6.Spreadtheslitopenandsliptheinsulationoverthecold water(inlet)pipeApplygentlepressurealongthelengthof. theinsulationtoensurethatitisfullyseatedaroundthepipe. Also,ensurethatthebaseoftheinsulationisflushwiththe waterheaterOnceseated,securetheinsulationwithduct. tape,electricaltape,orequivalent.
7.Repeatsteps5and6forthehotwater(outlet)pipe.
8.Addadditionalsectionsofpipeinsulationasneeded.
T&PReliefValveInsulation
Thevalvemustbemarkedwithamaximumsetpressurenotto exceedthemarkedhydrostaticworkingpressureofthewater heater(150psi=1,035kPa)andadischargecapacitynottess thanthewaterheaterinputrateasshownonthemodelrating plate(Forelectricheaters,wattsx. 3.412equalsBtu/hrinput rate)
Forsafeoperationofthewaterheater,thereliefvalvemustnot
beremovedfromitsdesignatedopeningnorplugged.
madewithanyliveelectricalpart.Thedischargeopeningmust
notbeblockedorreducedinsizeunderanycircumstances. Excessivelength,over30feet(9.14m),oruseof morethan fourelbowscancauserestrictionandreducethedischarge capacityofthevalve.
efLever
Relief Valve
Drain Line
FIGURE 9.
Temperature-Pressure Relief Valve
Explosion Hazard
•Properly sized
•Can result in overheating and excessive tank pressure.
•Can cause serious injury or death.
This heater is provided with a properly certified combination temperature - pressure relief valve by the manufacturer.
The valve is certified by a nationally recognized testing laboratory that maintains periodic inspection of production of listed equipment of materials as meeting the requirements for Relief Valves for Hot Water Supply Systems, ANSI Z21.22 • CSA 4.4, and the code requirements of ASME.
If replaced, the valve must meet the requirements of local codes, but not less than a combination temperature and pressure relief valve certified as indicated in the above paragraph.
Water Damage Hazard
•
pipe must terminate at adequate drain.
No valve or other obstruction is to be placed between the relief valve and the tank. Do not connect tubing directly to discharge drain unless a 6 inch air gap is provided. To prevent bodily injury, hazard to life, or property damage, the relief valve must be allowed to discharge water in quantities should circumstances demand. If the discharge pipe is not connected to a drain or other suitable means, the water flow may cause property damage.
The Discharge Pipe:
•Shall not be smaller in size than the outlet pipe size of the valve, or have any reducing couplings or other restrictions.
•Shall not be plugged or blocked.
•Shall be of material listed for hot water distribution.
•Shall be installed so as to allow complete drainage of both the
•Shall terminate a maximum of six inches above a floor drain or external to the building. In cold climates, it is recommended that the discharge pipe be terminated at an adequate drain inside the building.
Shall not have any valve between the relief valve and tank.
ITs5D7.,1[€] :l | Water temperature | over 125°F | ||
| (52°C) can cause severe burns | |||
| instantly resulting in severe injury | |||
| or death. |
|
|
|
| Children, the elderly, | and the | ||
| physically | or mentally | disabled | |
| are at highest riskfor scald injury. | |||
| Feel water before bathing or | |||
| showering. |
|
|
|
| Temperature | limiting | valves are | |
| available. |
|
|
|
| Read instruction manual for safe | |||
| temperature | setting. |
|
|
11