33
Figure 27: Blocked Vent Switch Installation
A. Install vent system in accordance with local building
codes; or local authority having jurisdiction; or
National Fuel Gas Code, ANSI Z223.1/NFPA 54, Part 7,
Venting of Equipment and/or CAN/CGA B149
Installation Codes, Part 5, Venting Systems and Air
Supply for Appliances. Install any of the following for
this Series 8B Category I, draft hood equipped
appliance:
1. Type B or Type L gas vent. Install in accordance
with listing and manufacturer's instructions.
2. Masonry or metal chimney. Build and install in
accordance with local building codes; or local
authority having jurisdiction; or Standard for
Chimneys, Fireplaces, Vents, and Solid Fuel
Burning Appliances, ANSI/NFPA 211 and/or
National Building Code of Canada.
Masonry chimney must be lined with approved clay
flue lining or listed chimney lining system except as
provided in ANSI Z223.1/NFPA 54, Paragraph
7.5.4(a): Exception: Where permitted by the
authority having jurisdiction, existing chimneys
shall be permitted to have their use continued when
an appliance is replaced by an appliance of similar
type, input rating, and efficiency.
3. Single wall metal vent. Allowed by ANSI Z223.1/
NFPA 54 under very restrictive conditions.
B. Inspect chimney and remove any obstructions or
restrictions. Clean chimney if previously used for solid
or liquid fuel-burning appliances or fireplaces.
top of boiler. On Knocked Down boilers, the assembly is
located in Combination Boiler Parts and Control Carton.
1. Uncoil power cord.
2. Position mounting bracket onto lower edge of Draft
Hood skirt. Locate center tooth (with #10 sheet metal
screw) on outside and other two teeth inside Draft
Hood skirt. See Figure 27.
3. Slide mounting bracket tight against lower edge of
Draft Hood skirt. Position #10 sheet metal screw
above skirt's stiffening rib.
4. Secure bracket in position by tightening #10 sheet
metal screw against outer surface of Draft Hood
skirt.
5. Insert excess power cord through Jacket Right Side
Panel hole. Remove slack.
6. Position strain relief bushing around power cord.
Pinch bushing's two halves together and snap back
into hole in Jacket Right Side Panel.
7. Verify power cord, mounting bracket, and Blocked
Vent Switch are secure and located as shown in
Figure 27.
VI. Venting
C. Install Draft Hood on canopy outlet. Maintain height
from Jacket Top Panel to Draft Hood skirt as shown in
Figure 1. DO NOT ALTER, CUT, OR MODIFY
DRAFT HOOD.
D. Install Blocked Vent Switch. The Blocked Vent Switch
Assembly consists of a strain relief bushing, power
cord, and switch attached to mounting bracket. On
Packaged boilers, the assembly is shipped attached to
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