Operator`s manual

Operator's Manual: Models CB-1500 & CB-2500 (230 V / 50 Hz)
4-19
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. Failure to adhere to this rule may result in less than optimal system performance.
Figures 4L and 4M illustrate these stack designs. Choose the stack design which is appropriate for your
furnace installation and review all specifications provided in the related illustrations. When designing your stack,
adhere to the following specifications:
• Models CB-1500 and CB-2500 require minimum 203 mm (8") I.D. stack components.
• Ensure that the vertical stack height is at least 3 m (10 feet). If needed, increase the
vertical length of the stack or install a draft inducer to obtain -.02" W.C. draft over fire.
• Keep the horizontal stack run as short as possible; slant it upward at a minimum of
6.5 mm (1/4") per 305 mm (12") 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 (from furnace breach to within 45 cm (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