NTI Ti100-200 Installation And Operation Instructions Manual

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NTI Ti100-200 Installation And Operation Instructions Manual Manual pdf 32 page image

Trinity │Installation and Operation Instructions Ti Series3210.0 COMBI BOILER DHW PLUMBING AND OPERATIONThe Trinity Ti boiler comes in two versions; Standard (non-Combi) and Combi. Both versions are designed to provide Space andDomestic Hot Water (DHW) heating. To provide DHW heating, the Standard version must be installed in combination with anIndirect Fired Hot Water Heater, see Figure 10-2 for installation details. The Combi version of the Trinity incorporates an indirectfired DHW heat exchanger (Brazed Plate) and the controls necessary to heat DHW without requiring the addition of an IndirectFired Hot Water Heater. The Combi option is only available on models Ti150 and Ti200, as smaller units would not produceadequate DHW.The Trinity Combi is designed for installations where there is a limited DHW demand, such as smaller apartments and condos. Inapplications where there is a greater DHW demand NTI recommends the Combi in conjunction with a DHW storage tank (Figure10-2), or a Standard Trinity in conjunction with and Indirect Fired Hot Water Heater (Figure 10-2).DHW Description of OperationThe Trinity Combi heats domestic hot water on demand, indirectly, using a brazed plate heat exchanger. Using the factorysupplied and field installed flow switch, the Trinity Combi recognizes a DHW demand when the flow switch provides a contactclosure to terminals A-C on the top of the boiler; the contacts of the flow switch close at a DHW flow rate of approximately 0.5gpm or greater. Once the flow switch contact is made, the Combi immediately goes into DHW mode regardless of the status of theCentral Heating system (with the exception of an Er5 DHW lockout, see troubleshooting section). The burner fires and the Combiattempts to achieve a boiler temperature equal to the programmed “LO” setting (See Section 12.0). The LO setting is accessed viathe menu in the Sentry 2100 controller, and should be set at a value sufficient to heat the potable water, i.e. 150-165ºF. NTIprovides a Thermostatic Mixing Valve adjustable from 100 to 145°F; the mixing valve shall be installed between the Combi DHWoutlet fitting and the hot water supply pipe to the fixtures (See Figures 10-1 and 10-2), thus providing user protection fromscalding hot water.Code requirements may require the maximum setting of the Thermostatic Mixing Valve to be fixed at120°F or lower, see “Thermostatic Mixing Valve” below and the instructions included with the valve.Combi DHW Plumbing & Set-upDHW Inlet & Outlet Connections – The Trinity Ti Combi has two potable water connections, Inlet & Outlet, which exit the leftside of the Trinity Cabinet; on the inside of the cabinet the two lines are connected to the Brazed Plate Heat Exchanger; seeFigures 10-1(c) and (d) for identification of the DHW Inlet and Outlet fittings. See Figures 10-1 and 10-2 for installation details.Thermostatic Mixing Valve – A Sparcomix AM101-US-1 is provided with your package. This valve regulates the watertemperature leaving the plate heat exchanger, and must be used in every instance. The dial can be set to the desired temperaturerequired. Consult the Honeywell manual SD/IS150 for detailed instructions and settings. (Note: the valve must be set to a supplytemperature of not more than 120˚F. It is the responsibility of the installer to set the valve and remove the dial.)Scald Hazard - Hotter water increases the risk of scald injury. There is a hot water scald potential if thethermostatic mixing valve is set too high. Be sure to follow the adjustment instructions provided withthe thermostatic mixing valve. Failure to follow these instructions may result in serious injury or death.DHW Filter – Install a 100 micron or lower filter prior to the entrance of the DHW flow switch. Failure to protect the flow switchfrom dirt and debris will cause it to malfunction.Check Valve – A check valve must be field provided and installed on the outlet of the mixing valve to prevent expansion devisesdown stream from back flowing when the water pressure drops during cold water draws. Failure to prevent the backflow willcause water to flow forward through the flow switch, activating it, when the cold-water draw has ended and the water pressureincreases.Throttling Valve – Install a throttling valve, after the mixing valve, to regulate the maximum hot water flow rate. The Combi islimited to a firing rate of 150MBH (200MBH for Ti200C); therefore excessive flow rates will result in cooler hot watertemperatures.Drain and Isolation Valves – Install drain and isolation valves on the inlet and outlet of the brazed plate heat exchanger, as shownin Figures 10-1 and 10-2 so it can be flushed free of possible build-up caused by dirt or hard water.Hard Water – To prevent the formation of scale on the inside of the brazed plate heat exchanger and other components in thedomestic hot water system, water with hardness higher than 50 ppm Calcium Carbonate must be treated with a “Water Softener”prior to entering the appliance. Plugging of the domestic system by scaling or accumulation of dirt is not the responsibility of NYThermal Inc., and suitable steps shall be taken to avoid it.