Munchkin Gas-Fired Hot Water Boiler Exhaust Vent and Intake AIR Vent Sizing, Longer Vent Runs

Page 40

GAS-FIRED BOILER

Boiler Manual

PART 7: VENTING, COMBUSTION AIR & CONDENSATE REMOVAL (CONTINUED)

E.EXHAUST VENT AND INTAKE AIR VENT SIZING

1.The exhaust vent and intake air vent pipes should be 2" for the T50/T80, 3" for the 80M/140M/199M and 4" for the 399M.

2.The total combined equivalent length of exhaust vent and intake air pipe should not exceed 85 feet.

a.The equivalent length of elbows, tees, and other fittings are listed in the Friction Loss Table 7.5.

Table 7.5

FRICTION LOSS EQUIVALENT IN PIPING AND FITTINGS

FITTINGS OR PIPING

 

EQUIVALENT FEET

 

 

 

 

 

 

 

 

2"

 

3"

4"

 

6"

 

 

 

 

 

 

 

90 DEGREE ELBOW*

5'

 

5'

3'

 

3'

 

 

 

 

 

 

 

45 DEGREE ELBOW

3'

 

3'

1'

 

1'

 

 

 

 

 

 

 

COUPLING

0'

 

0'

0'

 

0'

 

 

 

 

 

 

 

AIR INLET TEE

0'

 

0'

0'

 

0'

 

 

 

 

 

 

 

STRAIGHT PIPE

1'

 

1'

1'

 

1'

 

 

 

 

 

 

 

CONCENTRIC VENT KIT

3'

 

3'

N/A

 

N/A

 

 

 

 

 

 

 

V500 2" VENT KIT

1'

 

N/A

N/A

 

N/A

 

 

 

 

 

 

 

V1000 3" VENT KIT

N/A

 

1'

1'

 

1'

 

 

 

 

 

 

 

V2000 4" VENT KIT

N/A

 

1'

1'

 

1'

 

 

 

 

 

 

 

*Friction loss for long radius elbow is 1 foot less.

b.For example: If the exhaust vent has two 90° elbows and 10 feet of PVC pipe we will calculate:

Exhaust Vent Pipe Equivalent Length = (2x5)+10=20 feet

Further, if the intake air vent pipe has two 90° elbows, one 45° elbow and 10 feet of PVC pipe, the following calculation applies:

Intake Air Vent Pipe Equivalent Length = (2x5)+3+10=23 feet

Finally, if a concentric vent kit is used we find:

Total Combined Equivalent Length = 20+23+3=46 feet

Therefore, the total combined equivalent length is 46 feet which is well below the maximum of 85 feet.

c.The intake air vent pipe and the exhaust vent are intended to penetrate the same wall or roof of the building.

d. Effort should be made to keep a minimum difference in equivalent length between the intake air vent pipe and the exhaust vent.

3.The minimum combined equivalent length is 16 equivalent feet.

F.LONGER VENT RUNS

1.The maximum combined equivalent length can be extended by increasing the diameter of both exhaust vent and intake air vent pipe equally. However, the transitions should begin a minimum of 15 equivalent feet from the boiler.

a.The maximum equivalent length for the increased diameter vent pipes is 125 feet.

b.Transitions should always be made in vertical sections of pipe to prevent the condensate from pooling in the vent pipe.

Table 7.6: Vent Run Transition

Vent

Reducing

Vent

Connection

Coupling

Transition

 

 

 

2"

3" x 2"

3"

 

 

 

3"

4" x 3"

4"

 

 

 

4"

6" x 4"

6"

 

 

 

c.If the transition occurs at a distance greater than 15 equivalent feet from the boiler, the maximum equivalent length will be reduced. See Table 7.7.

Table 7.7: Vent Termination Kits

Transition

TEL of

TEL of

Maximum

Point

Standard

Oversized

TEL of all

(ft from

2" Vent

2", 3" or 4"

Vent Pipe (ft)

boiler)

Pipe (ft)

Vent Pipe (ft)

 

 

 

 

15

30

95

125

 

 

 

 

20

40

77-1/2

117-1/2

 

 

 

 

25

50

60-1/2

110-1/2

 

 

 

 

30

60

43

103

 

 

 

 

35

70

26

96

 

 

 

 

40

80

8-1/2

88-1/2

 

 

 

 

None

85

0

85

 

 

 

 

TEL = Total Equivalent Length

G. EXHAUST VENT AND INTAKE AIR PIPE

INSTALLATION

1. Use only solid PVC, CPVC, or ABS schedule

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Contents Boiler Manual Contents Contents CONT’D Part 1 Product and Safety Information DefinitionsBefore Installing When Servicing BoilerBoiler Operation Boiler WaterSupply water temperature sensor Return water temperature sensorTemperature and pressure gauge Stainless Steel Heat ExchangerPart 3 Prepare Boiler Location Spark ignitionVision 1 System Boiler Location should be LevelDimensions Performance Ratings Connection Sizes FAN Speeds80M 140M/199M Installations Must Comply with Before Locating the BoilerPrecautions Clearances for Service AccessResidential Garage Installation Exhaust Vent and Intake AIR VentWhen Removing a Boiler from AN Existing Common Vent System Corrosive contaminants and sourcesRemove Boiler from BOX Part 5 Boiler PipingRelief Valve Diaphragm or bladder expansion tank Part 5 Boiler Piping Circulator Sizing Chart Circulator SizingSystem Temperature Rise Chart Fill and Purge Heating SystemZoning with Circulators Zoning with Zone ValvesMultiple Boilers Piping Symbol Legend Boiler Piping DetailsOFF Zone valves Make-up water Boiler Manual Space heating zone circuit Zone Circulators Make-up water PB1 PB2 PB1 PB2 Zoning with Circulators Using Vision Vision I System PipingSpace heating mode Boiler Piping Details with the Vision I SystemOFF DHW Space heating mode w/ submixing Water OFF Munchkin Vision 1 system zoning with circulators Space heating mode 3 fully reset supply temperatures Space heating mode 3 different supply temperatures OFF Thermal trap Drain plug General Installing Exhaust Vent and Intake AIR VentExhaust Vent and Intake AIR Vent Pipe Location Part 7 VENTING, Combustion AIR & Condensate Removal Reference National Fuel Gas Code Ansi Z223.1/NFPA 54 Exhaust Vent and Intake AIR Vent Sizing Exhaust Vent and Intake AIR Pipe InstallationLonger Vent Runs Heater Removal from a Common Vent System Vent Termination Kits Description Stock CodeCondensate Removal System Diagrams for Sidewall Venting Sidewall Venting with TEE Intake Coupling ExhaustSidwall Venting with KIT Diagrams for Vertical Venting Roof Vent with TEE Intake Coupling ExhaustPart 8 GAS Piping GAS ConnectionGAS Piping GAS TableOFF SET Adjustment Dungs GAS Valve for T50/T80/80M/140M/199MInstallation Must Comply with Field WiringLine Voltage Wiring Krom Schroder Valve for 399MPart 9 Field Wiring Part 9 Field Wiring Part 10 Field Wiring Vision Indirect Circulator P2 ProgramPart 11. START-UP Preparation Purge AIR from Water System Check for GAS LeaksCheck Thermostat Circuits Check Condensate Removal Final Checks Before Starting BoilerPart 12. START-UP Procedure Adjusting the SetpointOperating Instructions Status MenuVision 1 Program Access Test ModeProgramming the Vision I Option Boiler cannot be programmed while there is a call for heat Vision 1 Program NavigationFunction Default Function Function Value DescriptionCentral Heating Curve Function Control Program Reference Chart Function Default Setting Programmed SettingBoiler Error Munchkin Error CodeBoiler Fault Part 14 Troubleshooting 925 Control Board Fault Codes Description RemedyMaintenance Procedures Outdoor Sensor 7250P-319For GAS Leaks Sure Exhaust Vent is no Longer BlockedPart 15 Maintenance T50M/T80MT50M/T80M 80M/140M/199M Boiler Replacement Parts Boiler Boiler Start UP Report BoilerBoiler Inspection and Maintenance Schedule ManualBoiler Inspection and Maintenance Schedule Maintenance Notes Maintenance Notes Maintenance Notes Heat Transfer Products, Inc LP-185 REV /20/07

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