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Notice – Burnham SCG 1100-H4 User Manual

Page 17

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17

Vertical Venting

1. See Figure 43 on Page 72 for Blower Vent

Connector Assembly. Do not exceed maximum vent

lengths. Refer to Table 4.

2. Installation of a vertical vent drain tee 8116304U

is required on all vertical vent applications. See

Figures 6 and 7. Attach vertical vent drain tee

directly to elbow or horizontal pipe from an elbow

immediately after vent connector.

3. Slope horizontal runs minimum ¼ inch per foot.

Slope towards vertical vent drain tee. Position weld

seams in vent pipes, in all horizontal runs, at the top

to avoid condensate from lying on the seams.

4. Install fire stops where vent passes through floors,

ceilings or framed walls. The fire stop must close

the opening between the vent pipe and the structure.

5. Whenever possible, install vent straight through

the roof. Refer to Figure 7 if offset is necessary.

Maintain minimum clearance to combustible

materials.

6. Install Vent Terminal.

a. Size roof opening to maintain minimum

clearance from combustible materials.

b. Extend vent pipe to maintain minimum vertical

and horizontal distance of twelve (12) inches

from roof surface. Allow additional vertical

distance for expected snow accumulation.

Provide brace as required. Refer to Figures 8A

and 8B.

NOTICE

Vertical venting requires the use of roof flashing

and a storm collar to prevent moisture from

entering the structure.

c. Install storm collar on vent pipe immediately

above flashing. Apply Dow Corning Silastic 732

RTV Sealant between vent pipe and storm collar

to provide weathertight seal.

d. Attach vent terminal.

Vertical Air Intake Piping

7. Do not exceed maximum air intake length. Refer to

Table 4.

8. Locate air intake termination on the same roof

location as the vent termination if possible, to

prevent nuisance boiler shutdowns. However, boiler

may be installed with vertical venting and sidewall

combustion air inlet or visa versa, if installation

conditions do not allow alternate arrangement.

9. Use single wall metal pipe or PVC and fittings

available at most heating distributors.
a. Air intake pipe diameter is based on boiler size.

SCG-3 & SCG-4 uses 3 inch diameter piping.
SCG-5 & SCG-6 uses 4 inch diameter piping.
SCG-7 thru SCG-9 uses 5 inch diameter piping.

10. Air intake termination must be located:

Vertical - At least twelve (12) inches above the roof

surface plus the expected snow accumulation.

11. Start at collar on burner enclosure (inside boiler

jacket) and work towards the air intake terminal.

12. Maintain minimum of ¼ inch per foot slope on

horizontal runs. Slope down towards boiler.

13. The air intake pipe must be adequately supported

with straps or supports no less than five (5) feet

apart on horizontal runs. The complete air intake

piping system must be rigid and able to withstand

minor impacts without collapse.

14. Inlet air pipe penetration:

Vertical - Size roof opening to allow easy insertion

of inlet piping and allow proper installation of

flashing and storm collar.
a. Use appropriately designed vent flashing

when passing through roofs. Follow flashing

manufacturers’ instructions for installation

procedures. Flashing manufacturers are Air-

Jet, American Metal Products, Metal Fab, and

Simpson Dura-Vent.

b. Extend air intake pipe to maintain minimum

vertical and horizontal distance of twelve

(12) inches from roof surface. Allow

additional vertical distance for expected snow

accumulation. Provide brace as required. Refer

to Figures 8A and 8B.

c. Vertical air intake requires flashing and a storm

collar to prevent moisture from entering the

structure.

E. Separate Vertical Venting System

- See Figures 6, 7, 8A, 8B and 9.

NOTICE

Roof penetrations require the use of roof flashing

and storm collar - not supplied with boiler.