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

39

Page 39 Page 41
Page 40
Image 40
Munchkin Gas-Fired Hot Water Boiler manual Exhaust Vent and Intake AIR Vent Sizing, Longer Vent Runs
Page 39 Page 41

Gas-Fired Hot Water Boiler specifications

The Munchkin Gas-Fired Hot Water Boiler is a highly efficient heating system that has garnered attention in residential and commercial applications for its innovative design and advanced technology. This boiler is compact yet powerful, providing exceptional heating performance while maximizing energy efficiency.

One of the standout features of the Munchkin boiler is its modulating condensing technology. This system allows the boiler to adjust its output based on demand, which optimizes energy use and reduces unnecessary fuel consumption. By modulating the flame, the Munchkin boiler can maintain a steady heating output even during variable load conditions, ensuring that users enjoy consistent hot water without waste.

The Munchkin boiler offers an impressive AFUE (Annual Fuel Utilization Efficiency) rating, typically exceeding 95%. This high efficiency translates to significant savings on energy bills and a reduced carbon footprint. By capturing and reusing flue gases that would otherwise be lost, the condensing feature enhances the overall efficiency, making it a sustainable choice for modern heating needs.

In terms of installation, the Munchkin boiler is designed for versatility. Its compact size allows for easy placement in tight spaces, whether in residential basements or utility closets. The unit is compatible with a variety of piping systems and can be integrated with multiple heating sources including radiators, baseboards, and even in-floor heating setups.

Another notable characteristic of the Munchkin boiler is its advanced control system. The boiler is equipped with a user-friendly digital display that allows for easy programming, monitoring, and adjustments. This enhanced control capability ensures that users can fine-tune their heating schedules according to their lifestyle, optimizing comfort while maintaining peak efficiency.

Reliability is a hallmark of the Munchkin brand. Built with high-quality materials, these boilers are engineered to withstand the rigors of daily operation, offering durable performance for years. Furthermore, Munchkin provides robust customer support and service options to assist homeowners and professionals alike.

In summary, the Munchkin Gas-Fired Hot Water Boiler stands out due to its modulating condensing technology, high efficiency, compact design, and advanced control system. These characteristics make it an excellent choice for those seeking a reliable, efficient, and versatile heating solution. Whether for residential or commercial use, the Munchkin boiler provides consistent, effective heating that meets the demands of today's energy-conscious consumers.
Top Page Image Contents