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Part number 550-110-282/1108
10
GOLD
CGs-4E Gas-Fired Water Boiler — Boiler Manual
Prepare boiler location — air openings1e
Special considerations
Tight construction
ANSIZ223.1definesunusuallytightconstruction
where:
1. Walls and ceilings exposed to the outside atmo-
sphere have a continuous water vapor retarder with
a rating of 1 perm or less with openings gasketed,
and . . .
2. Weather-stripping has been added on openable
windows and doors, and . . .
3. Caulkingorsealantsareappliedtoareassuchas
joints around windows and door frames, between
sole plates and floors, between wall-ceiling joints,
between wall panels, at penetrations for plumbing,
electrical, and gas lines, and in other openings.
For buildings with such construction, provide air open-
ings into the building from outside, sized per the ap-
propriate case in
Figure 3 if appliances are to use inside
air for combustion and ventilation.
Exhaust fans and air movers
The appliance space must never be under a negative
pressure unless all appliances are installed as direct vent.
Alwaysprovideairopeningssizednotonlytothedimen-
sions required for the firing rate of all appliances, but
also to handle the air movement rate of the exhaust fans
or air movers using air from the building or space.
Motorized air dampers
If the air openings are fitted with motorized dampers,
electrically interlock the damper to:
• Preventtheboilerfromringifthedamperisnot
fully open.
• Shuttheboilerdownshouldthedamperclosedur-
ing boiler operation.
To accomplish this interlock, wire an
isolated contact
(proving the damper open) in series with the thermo-
stat input to the boiler. The boiler will not start if this
contact is open, and will shut down should it open
during operation.
Combustion air requirements
✷
Using outside air — direct vent only
CombustionairmustbeducteddirectlyfromoutsidetotheCGs-4Eboiler
air intake fitting. This method is defined as direct vent (also referred to
as sealed combustion). Refer to the appropriate vent supplement and the
instructions in this manual. Two options are available: sidewall or vertical
directvent.Eachrequiresaspecialventcomponentkit.
Sizing air openings
✷
Airopeningsprovideforventilationtopreventoverheatingoftheboiler
controlsandboilerspace.Airisalsoneededforotherapplianceslocated
in the same space.
Use
Figure 3,page11,selectingtheappropriateinstallationconditions.Note
thatthesizinggiveninFigure3appliesonlytoCGs-4Einstallationswith
clearances no smaller than shown in Figure 1, page 7 of this manual.
For smaller clearances, regardless of how the air openings are arranged, two
openingsprovidingfreeareaof1squareinchper1,000Btuhinputofall
appliances in the space are required.
Airopeningsmustbesizedtohandleallappliancesand
air movers (exhaust fans, etc.) using the air supply.
ThesizinggiveninFigure3isbasedontheNationalFuelGasCode,ANSI
Z223.1,allowingadequateairopeningforgravity-ventedgasappliances
(CategoryI).TheCGs-4EboilerisratedCategoryIV(pressurizedvent),
and has different requirements for combustion and ventilation air, reflected
by the special sizing instructions given in Figure 3. The air openings rec-
ommended in Figure 3 will allow adequate ventilation and combustion
air provided the boiler room is not subjected to negative pressure due to
exhaustfansorothermechanicalventilationdevices.RefertotheNational
FuelGasCodefordealingwithotherconditions.
Louver allowance
The free area of openings means the area after reduc-
tion for any installed louvers or grilles
.Besureto
consider this reduction when sizing the air openings.
Air opening location and sizing requirements de-
pend on the clearances around the boiler.
Check
the boiler placement compared to Figure 1, page 7.
If all clearances are at least equal to Figure 1,
page 7
, apply the sizing and placement of openings
given on pages 10 and 11.
If ANY clearance is less than Figure 1, page 7,
you must provide air openings sized and located
as shown in Figure 2, page 7. DO NOT apply the
sizing and location information shown on page 10
or 11. The Figure 2 air openings are required even if
the boiler is direct vented (outside air piped to the
boiler air intake as described in this manual). These
openings ensure adequate air circulation around the
boiler for cooling, even if the boiler does not use
inside air for combustion.
✷