Crown Boiler CWD083, CWD220, CWD060, CWD165, CWD138, CWD193 Summary of Vertical Venting Options

TABLE 3b: SUMMARY OF VERTICAL VENTING OPTIONS

VENT OPTION #		6	7	8	9	10
CLASSIFICATION USED IN THIS		VERTICAL	VERTICAL	(RESERVED	VERTICAL	VERTICAL
				FOR FUTURE	DIRECT	DIRECT
MANUAL		DIRECT VENT	DIRECT VENT
				USE)	EXHAUST	EXHAUST
ILLUSTRATED IN FIGURE		10	10		11	11
VENT PIPE STRUCTURE		ROOF	ROOF		ROOF	ROOF
PENETRATION
AIR INTAKE PIPE STRUCTURE		ROOF OR WALL	ROOF OR WALL		N.A.	N.A.
PENETRATION
VENT PIPE SIZE		3”	4”		3”	4”
AIR INTAKE PIPE SIZE		4”	4”		N.A.	N.A.
MAXIMUMVENT PIPELENGTH	CWD060 - CWD138	47 FT	47 FT		47 FT	47 FT
	CWD245	N.R.	47 FT		N.R.	47 FT
	CWD165	27 FT	47 FT		27 FT	47 FT
	CWD193	17 FT	47 FT		17 FT	47 FT
	CWD220	N.R.	47 FT		N.R.	47 FT
MAXIMUM PIPEINTAKE LENGTH	CWD060 - CWD138	52 FT	50 FT		N.A.	N.A.
	CWD165	32 FT	50 FT		N.A.	N.A.
	CWD193	22 FT	50 FT		N.A.	N.A.
	CWD220	N.R.	50 FT		N.A.	N.A.
	CWD245	N.R.	50 FT		N.A.	N.A.
EXHAUST TERMINAL		BY VENT SYSTEM MANUFACTURER. SAME DIAMETER AS VENT SYSTEM. SEE TABLE 4.
AIR INTAKE TERMINAL		4” 180 ELBOW	4” 180 ELBOW		N.A.	N.A.
(ROOF PENETRATION)
AIR INTAKE TERMINAL		4” 90 ELBOW	4” 90 ELBOW		N.A.	N.A.
(WALL PENETRATION)
VENT MATERIAL			APPROVED VENT SYSTEM SHOWN IN TABLE 4
AIR INTAKE MATERIAL			GALVANIZED OR PVC		N.A.	N.A.

“N.R” - Not recommended “N.A.” - Not applicable

8)Vertical Vent Terminal Locations (Vent Options 6 - 13) - Observe the following limitations on the location of all vertical vent terminals (see Figs. 10, 11, 12, 13):

•The lowest discharge opening on the cap must be at least 2 feet above any object located within 10 feet.

•If outside air is used for combustion (Options 6-7, 11-13), the vertical distance between vent and air inlet terminal openings must be at least 12”.

•The bottom of the air inlet terminal must be at least 12” above the normal snow accumulation that can be expected on the roof.

9)Terminal offsets - Horizontal elbow or tee terminals may be offset by as much as 5 ft as shown in Figure 14. This sometimes helps maintain the 12” minimum clearance required above the snow line. The extra two elbows and the section of vertical pipe on the outside of the building must be counted when checking that the maximum vent / intake pipe length is not exceeded. On horizontal direct vent systems, both terminals must be offset by the same amount so that their relationship to one another is the same as shown in Figure 8a. When this offset is used, the horizontal section of vent pipe must be pitched away from the outside so that condensate cannot collect in the lower offset elbow.

10)Wall thimbles – Wall thimbles are required where the vent pipe passes through combustible walls with less than the required clearance shown in Table 2 or as required by local codes. Vent manufacturer’s wall thimble part numbers are shown in Table 4.

11)Condensate Traps and Pitch of Horizontal piping – All horizontal vent piping must be pitched ¼” per foot so that any condensate which forms in this piping will run towards either the outdoors or into a condensate trap. Vent manufacturer’s part numbers for suitable condensate traps are shown in Table 4.

All vertical vent systems must include at least one condensate trap as shown in Figures 10-13. This will collect any condensate that forms in the vent system as well as any rain water that gets around the vent cap.

The maximum allowable vertical run directly off of the boiler without a condensate trap is 7.5 ft (Figure 16). Install a condensate trap in longer vertical runs so that condensate which might form in this first vertical section will not run into the

boiler fan.

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