Install Instructions

12
CAUTION
Do not use one vent damper to control two heating
appliances.
1. The vent damper must be the same size as the outlet
of the Draft Hood supplied with the boiler (see
Figure 1). Unpack the damper carefully - DO NOT
FORCE IT CLOSED! Forcing the damper may
damage the gear train and void the warranty.
2. Mount the vent damper assembly after the draft
hood, as close to the draft hood as practicable
without modication to the draft hood or vent
damper. (Refer to Figure 9 and to instructions
packed with the vent damper for specic
instructions). This is a must for the wiring harness to
t and the damper position indicator to be visible to
the users.
NOTICE
Provide adequate clearance for servicing.
WARNING
Provide 6" (15.2cm) minimum clearance between
damper and combustible construction.
3. Plug the factory harness vent damper connector into
damper motor polarized receptacle and secure the
harness to the damper motor bracket with provided
strain relief bushing.
DANGER
Inspect existing chimney before installing boiler.
Failure to clean or replace perforated pipe or tile
lining will cause severe injury or death.
F. Install Vent Connector
1. Model CG20D only - Install provided 4" x 3" vent
reducer into vent damper outlet, then, install vent
connector from reducer outlet to chimney.
2. All other sizes - Install vent connector from vent
damper outlet to chimney.
3. Vent installation shall be in accordance with
local building codes; or the local authority
having jurisdiction; or the National Fuel Gas
Code, ANSI Z223.1/NFPA 54; or the Standard
for Chimneys, Fireplaces, Vents, and Solid Fuel
Burning Appliances, ANSI/NFPA 211. Both of
the aforementioned standards, ANSI Z223.1 and
ANSI/NFPA 211, specify Type B and Type L double
wall metal vents and re clay tile lined masonry
chimneys as suitable chimney constructions for
Category I, draft hood equipped appliances, such
as this CG-D Series boiler. Both standards prohibit
the use of unlined masonry construction as a
chimney, with the exception in ANSI Z223.1/NFPA
54 that "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 efciency." ANSI/NFPA 211 prohibits
the use of single wall metal vent as a chimney,
while ANSI Z223.1 allows it under very restrictive
conditions.
Figure 9: Vent Damper Installation