Rheem Indirect Water Heater warranty Section III Pre-Installation, Boiler and circulator sizing

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Section III: Pre-Installation

boiler and circulator sizing

The ratings published in this manual for your Rheem indirect water heater can be obtained through proper selection of boiler output and circulator capacity. As noted, the ratings in Table 2 are based on a 77°F rise with 58°F potable water inlet temperature at a circulator pump flow rate of 8 GPM. The boiler was set at 180°F. See Table 3 for additional first hour ratings at pump flow rates of 6, 8, 10 and 12 GPM with 180°F and 200°F boiler water.

To determine the appropriate circulator for your system, follow these three steps:

1)Calculate the pressure drop of all straight pipe and fittings on the supply and return at the desired flow rate.

2)Add the pressure drop from Step 1 to the pressure drop through the indirect water heater coil (see Table 2 for friction loss) to obtain a total pressure drop.

3)Select a circulator pump that will provide adequate flow at the total pressure drop.

A pump performance curve should accompany every circulator pump. Figures 3-5 contain performance curves for Taco and Grundfos circulator pumps, recommended by Rheem.

Figure 3: Taco 00 Series performance curves

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Contents Indirect Water Heater Table of Contents NPT Section I SpecificationsSTID30 Water treatment/filtration Temperature controlSection II General Information LocationAnode rods Temperature and pressure relief value t&PBack-flow preventor closed loop system Boiler and circulator sizing Section III Pre-InstallationGrundfos UP 15-42F performance curve Water connections Section IV InstallationRheem Indirect Water Heater with Low-Mass Boiler Indirect Circulator Electrical connectionsFlush the tank Section V MaintenanceWater piping Relief valve352%/0 $86 62/87,21 Section VI TroubleshootingDescription Applicable Models Section VIi parts listLimited Warranty Exclusive Warranty Limitation of Liability