Munchkin Gas-Fired Hot Water Boiler Installation Manual download pdf (Page 39)

GAS-FIRED HEATER Installation 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" 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.

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.

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 boiler.

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

boiler, 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

INSTALLATION

1. On the Munchkin Contender the 2" exhaust

vent connection is located on the top, right

side of the boiler and the air intake is on the

top, left side. The air intake connection is

intended for a slip fit. No sealant or adhesive

is required.

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'

Table 7.6

Transition

Point

(ft from

boiler)

TEL of

Standard

2" Vent

Pipe (ft)

TEL of

Oversized

2" or 3" Vent

Pipe (ft)

Maximum

TEL of all

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

Table 7.7: Vent Termination Kits

1 2 ... 34 35 36 37 38 39 40 41 42 43 44 ... 67 68

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Munchkin Gas-Fired Hot Water Boiler Installation Manual Page 39

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