kn series gas boiler installation & operating ... - Agencespl.com

Page 16KN INSTALLATION AND OPERATION INSTRUCTIONSDOMESTIC WATER SUPPLY PIPINGCAUTION: Proper controls must be used to preventwater supplied for domestic use from exceeding130°F, 54°C or a scald injury will occur! When higherwater temperatures are required for appliances suchas a dishwasher, a mixing valve or some othertempering means must be installed. Householdswith small children may require water temperaturesless than 120°F, 49°C. Local codes must be compliedwith!General Piping RequirementsThe KN boiler can be use in combination with an indirecttank to provide hot water for domestic use. Piping andcomponents must be suitable for use with potable water.The indirect storage tank must be equipped with atemperature and pressure relief valve that complies withANSI Z21.22 or CAN-4.4 and CAN-4.6.NOTE: The storage tank must be located as closeto the boiler as possible to prevent excessive headloss which will reduce flow.Expansion TankAn expansion tank or other means to control thermalexpansion must be installed in the water heating systemif back flow prevention devices are installed.Two typical water heating systems are shown in Figures12 & 13.Thermostatic Mixing Valve- Water Above 140°F, 60°CWater can be stored a temperatures above 140°F,60°C provided that a thermostatically controlled mixingvalve is used to temper the hot water to an acceptabletemperature before it's supplied for domestic use. Themixing valve MUST be set to prevent a scald injury fromoccurring, see the caution against scalding above.Storage of water for domestic use above 140°F, 60°Cwill provide an increased quantity of tempered water andhelp prevent the growth of water born bacteria.Figure 12 - Typical Single Boiler with Indirect Storage Tank PipingNOTE: Not all system valves maybe shown. Consult local codes foradditional system componentswhich may be necessary.