Crown Mega-Stor 2 Installation Manual

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ow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ow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 uid 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.