c.The required flow rate can be calculated based on the design temperature difference from the return to the supply of the boiler. For a PI-T80 with a design temperature difference of 20°F the calculation is as follows:

Output 64,000

Required Flow = ∆T x 500 = 20 x 500 = 6.4 GPM

d.Table 3.3 shows the pressure drop (in feet of water) for a flow rate which gives a 20°F temperature difference for each boiler model.

Table 3.3 – Flow Rate and Pressure Drop

Boiler

Flow Rate

Pressure Drop

Model

(GPM [LPM])

(Feet [meters])

 

 

 

PI-T50

4.0 (15.1)

4.5 (1.22)

 

 

 

PI-T80

6.4 (24.2)

5.0 (1.52)

 

 

 

PI-80

6.4 (24.2)

5.0 (1.52)

 

 

 

PI-140

11.2 (42.4)

8.0 (2.44)

 

 

 

PI-199

15.9 (60.2)

13.0 (4.02)

 

 

 

e.The boiler pressure drop for various flow rates can be determined by using Figure 3.2, the Pinnacle Circulator Sizing Graph.

f.Table 3.4 gives the recommended circulators for a boiler on a secondary loop with water as the heating medium.

Table 3.4 – Recommended Circulators

Boiler

TACO

Grundfos Circulator

Model

Circulator

 

 

 

 

PI-T50

006

UPS 15-58FC SPD-1

 

 

 

PI-T80

007

UPS 15-58FC SPD-2

 

 

 

PI-80

007

UPS 15-58FC SPD-2

 

 

 

PI-140

0010

UPS 15-58FC SPD-3

 

 

 

PI-199

0011

UP 26-64F

 

 

 

NOTICE

The circulator sizing given is for primary/secondary installations only. The system circulators must be sized based on the flow and pressure drop requirements of the system.

WATER PIPING AND CONTROLS

g.Special consideration must be given if anti-freeze is to be used as a heating medium. Propylene glycol has a higher viscosity than water therefore the system pressure drop will be higher.

10.Indirect Water Heater: An indirect water heater should be piped in a dedicated zone. It consists of a water tank that is heated by boiler water passing through an internal coil. Examples of indirect water heating are shown in the System Piping subsection of this Section.

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PB Heat Gas Boiler Flow Rate and Pressure Drop Boiler Model, Feet meters, Recommended Circulators Boiler, Model Circulator
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Gas Boiler specifications

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