Bradford-White Corp B4 warranty Venting of Combustion Products, Water Flow, General Information

Internet Version for Reference Only

Page 8 BRADFORD WHITE

2.5 Venting of Combustion Products

2.5.1 General Information

When installed indoors, the drafthood must be connected to a venting system. The venting system must be installed by a qualified installer and in accordance with the latest edition of ANSI Z223.1. In Canada, the installation must be in accordance with CAN1-B149.1 or .2, and any local codes that apply.

The vent pipe must have a listed vent cap, and extend at least 2 feet (0.6 m) above any object within a 10 foot (3.0 m) radius.

NOTE: Do not use sheet metal screws at the snap lock joints of Type B double-wall gas vents.

Do not weld or bolt the vent pipe to the heater drafthood. The weight of the stack must not rest on the heater. The drafthood and heater top must be easily removable for normal heater service and inspection.

WARNING

Avoid ending heater vents near air conditioning or air supply fans. The fans can pick up exhaust flue products from the heater and return them inside the building, creating a possible health hazard.

Avoid horizontal runs of the vent pipe and 90 degree elbows, reductions, and restrictions. Horizontal runs should have at least a 1/4 inch (6.3 mm) rise per foot in the direction of flow. Support a vent connector for the design and weight of the material used to maintain clearances and physical damage and separate of joints.

Always use double-wall or insulated vent pipe (Type B or equivalent).

WARNING

In cold weather, uninsulated outside vents can chill the rising flue products, blocking the natural draft action of the venting system. This can create a health hazard by spilling flue products into the heater room.

Avoid oversize vent piping or extremely long runs of the pipe which may cause too much cooling and condensation of flue gasses.

When the installation of a power vent or draft fan in the venting system is necessary, qualified personnel should design the installation following good engineering practices and all applicable codes. A suitable draft switch must be wired into the heater control circuit at the terminal designated Field Interlock to keep the heater from firing unless there is a positive draft.

2.5.2Replacement of Existing Heater

When a heater is removed from a common

venting system, the venting system may be too large for proper venting of the other appliances connected to it.

If replacing an existing heater with a Copper Brute heater and the existing heater was connected to a common venting system, the common venting system must comply with ANSI Z223.1/National Fire Protection Association (NFPA) 54. When resizing any portion of the common venting system, the common venting system should be resized to approach the minimum size as determined using the tables in ANSI Z223.1/NFPA 54, Appendix G. In Canada, the common venting system should be resized so the installation will be in accordance with CAN/CGA B149.1 or .2.

2.6 Water Flow

2.6.1Reversible Water Connections

Bradford White ships the heater with the

water connections on the right side. The heater can be installed with the water connections on either side. It could be necessary, or helpful, to switch the connections to the left side to improve access for installation service. Have a professional service technician perform this modification before installing the heater using the following procedures:

1.Remove the front cover.

2.If there is a vent cap or drafthood installed, they must be removed before removing the grate top assembly. On indoor installations (sizes 175- 250), the drafthood switch must be disconnected at the left side of the heater.

3.If the unit is in the low-profile outdoor configuration, remove the hex-head screws (see Figure 15) and lift the grate top assembly straight up.

4.Remove the screws that fastens the flue collector holddown clamps and remove the clamps (see Figure 16).

5.Remove the flue collector assembly by lifting it out of the chassis.

6.Remove the screws that fastens the gap closures and put them aside.

7.Remove the three grommets.

8.Remove the drain valves and plug. There is one hex plug on the left side, near the rear of the jacket. The drain valves are located on the left side and right side of the heater (see Figure 15).

9.Remove the four screws that fastens the metal channels covering the capillary tube on the right side of the jacket, and lay the channels aside.