Crown Boiler CWI241, CWI172, CWI345, CWI310, CWI103, CWI276, CWI Series Ix Tankless Heater Piping

FIGURE16: GRAVITYPIPING

IX TANKLESS HEATER PIPING

If the CWI is installed with an optional tankless heater, pipe the heater as shown in Figure 17. The components in this system and their functions are as follows:

1)Mixing Valve (Required) - During the heating season, the water exiting the tankless heater may be 180 degrees or more. The mixing valve blends hot water leaving the tankless heater with cold water so as to maintain the hot water supplied to the fixtures at a fixed temperature. This saves energy, increases the amount of usable hot water available to the homeowner, and reduces the risk of scalding.

Install a mixing valve with a setting range of approximately 110 to 130F. Follow the manufacturer’s instructions for installing this valve. Usually a “heat trap” will be required between the coil and the “hot” connection on the mixing valve.

2)Flow Restrictor (Recommended) - If water is drawn from the tankless coil at a rate in excess of the rating in Table 1, the temperature of the hot water may be too low to be of use. The use of a flow restrictor will prevent this problem by limiting the rate at which water can pass through the tankless heater. If a restrictor is used, select one having a rating in GPM approximately equal to the rating shown in Table 1. If possible, locate this restrictor at least 3 feet from the tankless heater inlet so that it is not subjected to excessive temperatures when no water is flowing through the coil.

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