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. Do not connect into same leg of chimney serving an
open replace.
4. Inspect chimney for obstructions or restrictions and
remove. Clean chimney if necessary.
5. Vent pipe to chimney must not be smaller than outlet
on draft hood or damper. Although single wall vent
pipe may be used, Type B is recommended. The
venting system must be arranged so that only the
boiler is served by the damper device.
Exception: National Fuel Gas Code, ANSI
Z223.1/ NFPA 54 allows vent downsizing when
vent size determined by their Vent Sizing Tables
is smaller than draft hood outlet/vent damper.
This code requires all of the following:
(a) Total vent height (H) is at least 10 ft (3 m);
(b) Vent not reduced more than one table size;
and
(c) Draft hood outlet/vent damper is greater
than 4 in. (102 mm) in diameter (CG20D
and CG30D cannot use smaller vent size).
Figure 9: Vent Damper Installation