Weil-McLain 88 manual Piping multiple boilers, By-pass circulator sizing

Page 15

Boiler manual: • Installation • Start-Up • Maintenance • Parts

Connect water boiler piping (continued)

 

 

 

Figure 16 Recommended minimum pipe sizes when flow rate is

Figure 18 By-pass piping for return water less than

not known (see Figure 14, page page 14) (note 1)

 

140°F

Boiler

Supply pipe size

Return pipe size

model

A

B

 

 

 

488

3"

3"

 

 

 

588 – 788

4"

4"

 

 

 

888 – 1188

5"

5"

 

 

 

1288 – 1888

6" (note 2)

6" (note 2)

 

 

 

Note 1 Pipe sizes are based on a 20°F temperature rise through the boiler. For applications with higher flow rates (lower temperature rise), determine the flow rate and use Figure 15, page page 14 to size the piping.

Note 2 6-inch piping requires nipples and 5" x 6" reducing couplings (provided with 1288 through 1888 boilers only). The total pressure drop through the 1888 boiler using the nipple and reducing coupling will not exceed ¼ PSI. For smaller boilers, the pressure drop will be less.

By-pass circulator sizing:

1.Size system circulator as required. Determine GPM and head requirements.

2.Provide a by-pass circulator for EACH boiler. The flow rate for each by-pass circulator will be:

Flow = ¼ x (System circulator GPM) ÷ (# of boilers)

Figure 17 ASME drain valve size

Boiler

Minimum blow-off

model

valve size

 

 

 

488

– 588

1"

 

 

688 – 1088

1¼"

 

 

 

1188

– 1888

1½"

 

 

 

Piping multiple boilers

1.See Figure 18. (Expansion tanks, relief valves and other accessories are required, but omitted from the illustration for simplicity.)

2.The boiler piping circuits are referred to as the secondary circuits in the following.

3.The legend for Figure 18 and boiler pump sizing recommenda- tions follow:

ASize boiler pump GPM based on the following:

a. Temp rise = High limit temp – Return water temp

b GPM. =

Boiler Gross Output, Btuh

Temperature rise x 500

 

c.Calculate only secondary (boiler) piping circuit resistance. Al- low for head loss through the boiler equal to three 90 degree elbows of secondary pipe size.

d.Operate each boiler and its pump with a Weil-McLain boiler control panel.

e.Size secondary (boiler) circuit piping using the flow rate ranges given in Figure 17, page 15.

BPrimary pump GPM and head calculation should not include secondary boiler circuits. Primary pump can operate continuously during heating season.

CConnection to primary circuit — Space 12" maximum or as close as practical.

DCheck valve.

EHand valve.

Part No. 550-100-068/0308

3.All circulators must run at the same time.

4.Example: For a 1,000,000 Btuh single boiler, with system temperature drop of 20°F:

System GPM = 1,000,000 ÷ 20 ÷ 500 = 100 GPM

By-pass GPM = ¼ x 100 GPM = 25 GPM

Determine by-pass circuit head loss for pipe size and fittings used.

5.In most applications, a standard booster pump should be adequate.

Figure 19 Multiple water boiler piping

15

Image 15
Contents Boiler Manual Read before proceeding Hazard DefinitionsRead before proceeding Contents Provide clearance around boiler Before installing boilerInstallation must comply with Before selecting boiler locationCombustion air openings to outside Required volume of interior spacesCombustion and ventilation air openings Combustion air openings to insideMechanical Combustion Air Supply Engineered InstallationsCombustion air combination indoor and outdoor openings Louvers, Grilles, and ScreensFor block assembly Set boiler in placeFor packaged boiler Prepare and position back section Assembling the blockIf using tankless heater TI sections Install intermediate sectionsBoiler model Section arrangementNumber Perform hydrostatic pressure test Prepare boiler and testSteam boiler Between 45 and 55 psig Complete block assembly Install burner mounting plate on front sectionInsert HXT-bars Install draft hood collar Install cleanout platesInstall piping Connect water boiler pipingGeneral water piping information By-pass circulator sizing Piping multiple boilersGeneral steam piping information Connect steam boiler pipingHartford loop piping for all steam boilers Steam boiler piping guidelinesDrawing legend & notes Minimum height of header above water line must be 24 inchesModel 1288 through 1888 steam 3 or 4 risers required Multiple Steam Boiler Piping Gravity Condensate Return Remove jacket parts from cartons Install jacketBefore installing jacket Install support brackets/channelsInstall jacket Install jacket trim Install jacket front and back panelsInstall jacket side panels Install jacket top panelsJacket side panel placement Jacket top panel placement Pipe tankless heaters To pipe tankless heatersHot water can scald Install controls Install water boiler controlsSteam control locations Install steam boiler controlsSteam control siphon and fittings Construct metal breeching Connect breeching and venting systemsGeneral venting information Select type of venting systemStub vent forced draft single boiler Install burner & wiring and fill system Install fuel piping Fuel oil pipingGas piping Skim steam boilers Make final adjustmentsAdjust burner and damper assembly Flue gas temperature no lower than 330FHandling ceramic fiber and fiberglass materials Removal of Front Plate or Cleanout Plate Materials=B=R Ratings1788 1888 DimensionsDimensions inches Model Model Supply & return tappings Burner lengths Dimension FDimensions see lettered dimensions on opposite Description Part number PartsParts Weil-McLain Limited Warranties Warranty

88 specifications

The Weil-McLain 88 series is a commercial cast iron boiler recognized for its durability, efficiency, and versatile design, making it a preferred choice for various heating applications. Designed primarily for commercial and industrial use, the Weil-McLain 88 combines advanced technology with proven engineering principles to deliver reliable performance and long-lasting service.

One of the standout features of the Weil-McLain 88 is its cast iron construction. Cast iron is renowned for its ability to retain heat, resulting in lower fuel consumption and more consistent heating. This robust material ensures that the boiler can withstand high temperatures and pressures, making it suitable for heavy-duty applications. The sectional design of the boiler allows for easy installation and maintenance, enabling quick access to components and minimizing downtime.

In terms of efficiency, the Weil-McLain 88 is designed to achieve high thermal efficiency ratings. The boiler employs a flue gas recirculation system, which significantly reduces heat loss and maximizes energy utilization. Additionally, its low water content provides rapid heating response times, ensuring that spaces are heated promptly, even during peak demand periods.

Another noteworthy characteristic of the Weil-McLain 88 is its versatility. The boiler can be configured for a variety of applications, including hot water heating, hydronic heating systems, and steam heating. It is compatible with multiple fuel types, including natural gas, propane, and various oil options, allowing for flexibility in fuel choice based on availability and pricing.

The Weil-McLain 88 also incorporates advanced control technologies that enhance operational efficiency. The integrated electronic controls feature diagnostic capabilities to streamline troubleshooting and maintenance, ensuring optimal performance throughout the boiler’s lifespan. Moreover, the boiler's design is compatible with modern building management systems, allowing for seamless integration into existing heating setups.

Overall, the Weil-McLain 88 series stands out for its combination of quality construction, efficient operation, and adaptability to different heating needs. Whether for a commercial building, industrial facility, or institutional application, the Weil-McLain 88 provides a reliable and efficient heating solution that meets the demands of the modern world.