8
V. PIPING
A) BOILER SIDE PIPING
A typical boiler-side piping installation is shown in Figure 5.1. A circulator zone system is shown, but zoning can also be done
using two or three-way zone valves, as long as the boiler water flow rate called for in Table 2.1 can be achieved (this requirement is
harder to meet with some zone valves). If circulator zoning is used, check valves must be installed in each zone to prevent unwant-
ed circulation through zones which are not calling for heat.
Table 5.2 shows combinations of circulators, pipe size, and equivalent length that will result in the flow rates called for in Table
2.1.
FIGURE 5.1: BOILER-SIDE PIPING USING CIRCULATOR ZONES
CAUTION
1. The heat transfer-medium must be water or other nontoxic fluid having a toxicity rating or Class of 1, as
listed in
Clinical Toxicology of Commercial Products
, 5th edition.
2. The pressure of the heat transfer medium must be limited to a maximum of 30 PSIG by an approved
safety or relief valve.
NOTICE
Use of the minimum pipe sizes shown in Table 7.2 is strongly recommended. Failure to size the
indirect water heater boiler-side piping and circulator may result in failure of the water heater to meet
the performance requirements shown in Table 2.1.
Summary of Contents for Mega-Stor II
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