Operator's Manual: Models CB-3500 & CB-5000
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-3500 requires
minimum 8" I.D. stack components.
Model CB-5000 requires
minimum 10" I.D. stack components.
•
Ensure that the vertical stack height is at least 10 feet PLUS 1.5 feet 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
(stack components from furnace breach to within 18" of ceiling, roof, or sidewall of
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
(6) Draft Inducer
(standard component for Model CB-5000; optional accessory for Model CB-3500)
Summary of Contents for CB-3500 series
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