GAS-FIRED HEATER Installation Manual

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

1.The exhaust vent and intake air vent pipes should be 2" or greater, Schedule 40 or 80.

2.The total combined equivalent length of exhaust vent and intake air pipe should not exceed 85 feet for 2" and 125' for 3".

a.The equivalent length of elbows, tees, and other fittings are listed in the Friction Loss Table 7.6.

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

exhaust vent.

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

4.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 heater.

b. For example: If the exhaust vent has two

Table 7.6

FRICTION LOSS EQUIVALENT IN PIPING AND FITTINGS

FITTINGS OR PIPING

EQUIVALENT FEET

 

 

 

 

2"

3"

 

 

 

90 DEGREE ELBOW*

5'

5'

 

 

 

45 DEGREE ELBOW

3'

3'

 

 

 

COUPLING

0'

0'

 

 

 

AIR INLET TEE

0'

0'

 

 

 

STRAIGHT PIPE

1'

1'

 

 

 

CONCENTRIC VENT KIT

3'

3'

 

 

 

V500 2" VENT KIT

1'

N/A

 

 

 

V1000 3" VENT KIT

N/A

1'

 

 

 

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

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

b.Use a 3” x 2” reducing coupling to transition from the 2” connections to a 3” vent.

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

d.If the transition occurs at a distance greater than 15 equivalent feet from the heater, the maximum equivalent length will be reduced. See Table 7.7. The standard Vent Pipe for Munchkin Contender is 2".

F. EXHAUST VENT AND INTAKE AIR PIPE

Table 7.7: Vent Termination Kits

Transition

TEL of

TEL of

Maximum

Point

Standard

Oversized

TEL of all

(ft from

2" Vent

2" or 3" Vent

Vent Pipe (ft)

heater)

Pipe (ft)

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

INSTALLATION

1.On the Munchkin Contender the 2" exhaust vent connection is located on the top, right side of the unit and the air intake is on the top, left side. Sealant or adhesive is required for all fittings.

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

40

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Munchkin Gas-Fired Hot Water Circulating Heater installation manual Exhaust Vent and Intake AIR Pipe, Installation
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Gas-Fired Hot Water Circulating Heater specifications

The Munchkin Gas-Fired Hot Water Circulating Heater is a cutting-edge heating solution designed to provide efficient and reliable hot water for residential and commercial applications. Renowned for its compact design and innovative technology, the Munchkin heater combines performance with energy efficiency, making it an ideal choice for those seeking comfort and cost savings.

One of the main features of the Munchkin heater is its modulating burner. This technology intelligently adjusts the heating output based on the demand for hot water, ensuring that energy is not wasted. This leads to lower energy bills and a reduction in environmental impact, as the system only uses the necessary resources to maintain desired water temperatures.

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In summary, the Munchkin Gas-Fired Hot Water Circulating Heater is a high-efficiency, compact, and innovative solution for hot water needs. With its modulating burner, high-efficiency rating, advanced control systems, and safety features, it stands out as a reliable choice for those looking to invest in heating technology that prioritizes energy conservation and performance. This heater is truly a forward-thinking solution for modern hot water requirements.
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