National Oilheat Research Alliance 41 size and the water temperature in the boiler must be considered. Figure 12 below. Piping and Maintenance Recommendations The following guidelines should be followed in addition to the manufacturer’s specific recommendations, unless the manufacturer recommends otherwise. • When installing a new unit, all piping should be new copper with a minimum number of elbows. • When piping direct and indirect water heaters, it’s a good practice to install a heat trap as shown in Figure 13 to reduce standby losses. • All piping should be checked for leakage at joints, valves and unions on an annual basis. • The temperature & pressure relief valve should be checked for proper operation on an annual basis as follows: Attach a drain line to the valve and direct the water discharge to an open drain (the water will be HOT!) Lift the valve lever several times and ensure that it operates freely and returns to its original position. If the valve does not function properly, replace it. Figure 11 Figure 12
NORA Advanced Hydronics
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