Lochinvar 3.5, 2.5 service manual Circulator sizing, Model, 20F 40F 60F

Page 25

Installation & Operation Manual

5 Hydronic piping (continued)

Circulator sizing

The Crest heat exchanger does have a pressure drop, which must be considered in your system design. Refer to the graph in FIG. 5-1 for pressure drop through the Crest heat exchanger.

Figure 5-1Pressure Drop vs. Flow

CREST Pressure Drop Curve

 

16

 

 

 

 

 

 

 

 

15

FBN1500

 

 

 

 

 

 

Head)

14

FBN2000

 

 

 

 

 

 

13

FBN2500

 

 

 

 

 

 

12

FBN3000

 

 

 

 

 

 

of

11

FBN3500

 

 

 

 

 

 

(Feet

 

 

 

 

 

 

10

 

 

 

 

 

 

 

9

 

 

 

 

 

 

 

Drop

 

 

 

 

 

 

 

8

 

 

 

 

 

 

 

7

 

 

 

 

 

 

 

Pressure

 

 

 

 

 

 

 

6

 

 

 

 

 

 

 

5

 

 

 

 

 

 

 

4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

 

 

 

 

 

 

 

 

2

 

 

 

 

 

 

 

 

1

 

 

 

 

 

 

 

 

0

 

 

 

 

 

 

 

 

0

50

100

150

200

250

300

350

Flow Rate (GPM)

Table 5A Sizing Information for Temperature Rise Applications_20°F, 40°F and 60°F

TEMPERATURE RISE APPLICATIONS

Model

 

BOILER

 

 

 

20°F

 

40°F

 

 

 

60°F

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CONNECTION SIZE

 

GPM

 

FT/HD

GPM

 

FT/HD

 

GPM

 

FT/HD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FB 1500

 

4"

 

 

138

 

3.4

69

 

1.5

 

46

 

1.0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FB 2000

 

4"

 

 

184

 

4.1

92

 

1.6

 

61

 

1.0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FB 2500

 

4"

 

 

230

 

4.6

115

 

1.3

 

77

 

0.7

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FB 3000

 

4"

 

 

277

 

5.6

138

 

1.2

 

92

 

0.7

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FB 3500

 

4"

 

 

323

 

7.5

161

 

1.2

 

108

 

0.7

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

[Based on 92% AHRI Efficiency]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NOTICE

The pressure drop reflected in FIG. 5-1 is

NOTICE

It is required that boiler piping systems

for the boiler only. Additional allowances

utilize

Primary/Secondary or Fixed

or

 

 

must

be made

for

piping,

 

especially if

 

 

 

 

 

 

 

Variable Flow Primary

configurations

as

 

 

sizing

pumps

for

Primary/Secondary

 

 

 

 

 

 

shown in FIG.’s 5-2 thru 5-5. The use of

 

 

 

 

 

 

 

 

 

 

applications.

other boiler piping configurations could

 

 

result in improper building and system flow

 

rates leading to inadvertent boiler high limit

 

shutdowns and poor system performance.

25

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Contents Save this manual for future reference Contents Please read before proceeding When servicing boilerBlowers Crest How it worksCrest How it works Models 1.5 2.0 2.5 3.0 Crest Ahri Rating RatingsRecommended clearances for service access Installation must comply withDetermine boiler location Before locating the boiler, checkFlooring and foundation Provide air openings to roomVent and air piping Prevent combustion air contaminationProducts to avoid When using an existing vent system to install a new boilerAreas likely to have contaminants When removing a boiler from existing common vent system Remove boiler from wood pallet 7Combustion Air from Outside Single Opening Minimum Recommended Combustion AIR Supply to Equipment Room Direct venting General ventingOptional room air Air inlet pipe materials Install vent and combustion air pipingAir intake/vent connections Approved Stainless Steel Vent Manufacturers Make ModelRemoving from existing vent Common venting Vent/air termination vertical Vertical direct ventingDetermine location Prepare roof penetrations4Alternate Vertical Terminations with Multiple Boilers Multiple vent/air terminationsVent/air termination sidewall Sidewall direct venting2Clearance to Doors and Windows Prepare wall penetrations4Multiple Vent Terminations must also comply with Figure Room airHydronic piping Model Circulator sizing20F 40F 60F Near boiler piping components Ball Valve Multiple Boilers Common Header Primary / Secondary Flow For all equipment and detailing required by local codes AIR Seperator Drain Port Typical System Supply Sensor Gas connections Connecting gas supply pipingModel Gas Inlet Size Propane Gas Natural gasCheck inlet gas supply GAS Piping Size ChartGas Pressure Gas valve replacementInstallation must comply with Field wiringLine voltage connections Outdoor temperature sensor EnableLouver proving switch Low voltage connectionsAlarm contacts Auxiliary switch 1Wiring of the cascade System supply sensorField WiringCondensate drain Condensate disposalStart-up Freeze protection when usedCheck/control water chemistry Fill and test water systemCheck thermostat circuits Check for gas leaksInspect condensate system Inspect/check condensate lines and fittingsStart the boiler Final checks before starting the boilerIf boiler does not start correctly Check system and boilerFor Your Safety Read Before Operating Gas Natural Gas Propane Valve Set space heating operationConfiguration of the cascade Verify HWG circulator mode Set HWG target temperatureSet clock General Operating informationProtection features Outdoor reset operation, if used Boiler temperature regulationCascade Sequence of operation Home Screen Crest control module2Main Menu Screen Service technician Maintenance Maintenance and annual startupOwner maintenance See the Crest User’s Information Manual for InstructionsMaintenance Check water system Flue vent system and air pipingCheck expansion tank Check boiler relief valveCheck all boiler wiring Check ignition ground wiringCheck control settings Check flame signalReview with owner Cleaning boiler heat exchangerHandling ceramic fiber materials Niosh stated First AidIntegrated Control Diagrams2Wiring Diagram
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3, 2, 3.5, 2.5 specifications

The Lochinvar 2, 3, 3.5, and 2.5 models are a standout lineup in the realm of commercial and residential water heating solutions. Known for their advanced technology and high efficiency, these units cater to a wide range of applications, ensuring optimal performance and reliability.

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