Bradford-White Corp BNTV, BNTH, Modulating Boiler Venting, Combustion Air and Vent Through Roof

Brute Elite Page 13

combustion air intake (see Table 4), sized per Table 2. Route the intake to the boiler as directly as possible. Seal all joints. Provide adequate hangers. The unit must not support the weight of the combustion air intake pipe. Maximum linear pipe length allowed is shown in Table 2. Subtract 5 allowable linear ft. (1.5m) for every elbow used.

The connection for the intake air pipe is at the top of the unit (see Figure 9a or Figure 9b).

In addition to air needed for combustion, air shall also be supplied for ventilation, including air required for comfort and proper working conditions for personnel.

3.2 Venting

WARNING

Failure to use CPVC or stainless steel venting for the first 20" (285-600) / 30" (80-210) of vent material or for any part of the venting that is installed inside a closet may lead to property damage, personal injury or death. The proper length of this material is supplied with boiler. Boilers in U.S. may use pipe included with boiler.

WARNING

Failure to use the appropriate vent material, installation techniques, glues/sealants could lead to vent failure causing property damage, personal injury or death.

WARNING

All venting must be installed according to this manual and any other applicable local codes, including but not limited to, ANSI Z223.1/NFPA 54, CSA B149.1, CSAB149.2 and ULC-S636. Failure to follow this manual and applicable codes may lead to property damage, severe injury, or death.

The flue temperature of the Brute Elite changes dramatically with changes in operating water temperature. Therefore, it is necessary to assess the application of the boiler to determine the required certified vent class. If the Brute Elite is installed in an application where the ambient temperature is elevated, and/or installed in a closet/alcove, CPVC or stainless steel material is required. If the system temperatures are unknown at the time of installation, class IIB or higher venting material is recommended.

The Brute Elite is a Category IV appliance and may be installed with PVC and CPVC that complies with ANSI/ASTM D1785 F441, or a stainless steel venting system that complies with UL 1738 Standard (see Table 5).

The unit’s vent can terminate through the roof, or through an outside wall.

When using PVC/CPVC for vent material, venting must be connected to the CPVC section included with Brute Elite sizes 80-600. The CPVC vent section included with the Brute Elite may be broken by CPVC fittings if necessary, but never reduced in total length. See Table 2 to select the appropriate vent pipe diameter. Vent pipe must pitch upward, toward the vent terminal, not less than 1/4" per foot, so that condensate will run back to the Brute Elite to drain. Route vent pipe to the heater as directly as possible. Seal all joints and provide adequate hangers as required in the venting system manufacturer’s Installation Instructions. Horizontal portions of the venting system must be supported to prevent sagging and may not have any low sections that could trap condensate. The unit must not support the weight of the vent pipe. Please see Table 2 for proper diameter vs. length allowed.

IMPORTANT NOTE ABOUT COMMON VENTING: A single vent that is shared by multiple Brute Elite units MUST be engineered by a competent venting specialist, and involves the selection of draft inducing equipment, hardware and controls to properly balance flue gas pressures. Do not common vent Brute Elite

Figure 10. Combustion Air and Vent Through Roof.

		INSTALLATION STANDARDS
MATERIAL	UNITED STATES		CANADA
Stainless Steel	UL 1738		Venting must be ULC-S636 certified for use as
PVC, sch 40	ANSI/ASTM D178		venting material. The venting material must be chosen
CPVC, sch 40	ANSI/ASTM F441		based upon the intended application of the boiler.

Table 5. Required Exhaust Vent Material.