CLEAN BURN CB-1400 Operator'S Manual Download Page 46

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Operator's Manual: Model CB-1400

4-18

Installing the Stack

WARNING:

Inappropriate stack materials or improper stack design/installation can adversely

affect the proper, safe operation of your furnace. Contact your Clean Burn dealer to purchase the

proper stack components for your furnace.

Stack designs are generally classified as follows:

(1) "Class A" stack through the ceiling of the building (refer to

Figure 4L

)

(2) "Class A" stack through the sidewall and up the side of the building (refer to

Figure 4M

)

Stack Design and Specifications

ATTENTION:

The stack design must be single and dedicated for each unit (furnace) according to

the following specifications.

A single stack serving more than one unit MUST be engineered/certified for

that specific installation (ref. NFPA 211, 3.3.39 and 10.2.1; NFPA 31 6.5.16-18). Failure to adhere to this
rule may result in less than optimal system performance.

Figures 4L and 4M illustrate recommended stack designs. Choose the stack design which is appropriate for
your furnace installation and review all specifications provided in the corresponding drawing. When designing
your stack, adhere to the following specifications:

•

Model CB-1400 requires

minimum 8" I.D. stack components

•

Ensure that the vertical stack height is at least 10 feet PLUS one foot for every fitting (e.g.
45 degree, 90 degree, or T) in the stack run.

If needed, increase the vertical length of the stack

or install a draft inducer to obtain -.02" W.C. draft over fire. (Section 8 contains details on
adjusting the draft.)

•

Keep the horizontal stack run as short as possible

; slant it upward at a minimum of 1/4" per

foot of run.

•

Keep the stack design simple.

Complicated stacks (with long runs and many turns) reduce

draft and result in poor burner performance.

Your stack may include only one 90 degree turn

All other stack turns must be at 45 degrees or less to ensure optimal draft and burner
performance.

NOTE:

If you plan to use an existing masonry chimney, the chimney must be

lined

and

inside

the building.

Exterior masonry chimneys chill the stack gases and result in poor draft and poor burner performance.

ATTENTION:

If you have an exhaust fan(s) in your shop, it is critical that you have adequate make

up air (source of fresh air to replace the stale air exhausted by the fan).

When an exhaust fan is run

without adequate make up air, the resultant vacuum in the building will draw combustion products back into the
burner. This back draft causes poor burner performance and may damage vital burner components. Refer to
Section 8 in this manual for additional information.

Stack components should be installed in the following order:

(1) Inside stack (the stack components from the furnace breach to within 18" of the ceiling, roof,

or sidewall of your building)

(2) Barometric damper
(3) "Class A" stack penetration through the ceiling, roof, or sidewall
(4) "Class A" stack on the exterior of the building
(5) "Class A" stack cap