Weil-McLain CGS-4E Manual

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Part number 550-110-282/1108

10

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CGs-4E Gas-Fired Water Boiler — Boiler Manual

Prepare boiler location — air openings1e

Special considerations

Tight construction

ANSIZ223.1definesunusuallytightconstruction

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. Caulkingorsealantsareappliedtoareassuchas

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.

Alwaysprovideairopeningssizednotonlytothedimen-

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:

• Preventtheboilerfromringifthedamperisnot

fully open.

• Shuttheboilerdownshouldthedamperclosedur-

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

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Using outside air — direct vent only

CombustionairmustbeducteddirectlyfromoutsidetotheCGs-4Eboiler

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

directvent.Eachrequiresaspecialventcomponentkit.

Sizing air openings

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Airopeningsprovideforventilationtopreventoverheatingoftheboiler

controlsandboilerspace.Airisalsoneededforotherapplianceslocated

in the same space.

Use

Figure 3,page11,selectingtheappropriateinstallationconditions.Note

thatthesizinggiveninFigure3appliesonlytoCGs-4Einstallationswith

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

openingsprovidingfreeareaof1squareinchper1,000Btuhinputofall

appliances in the space are required.

 Airopeningsmustbesizedtohandleallappliancesand

air movers (exhaust fans, etc.) using the air supply.

ThesizinggiveninFigure3isbasedontheNationalFuelGasCode,ANSI

Z223.1,allowingadequateairopeningforgravity-ventedgasappliances

(CategoryI).TheCGs-4EboilerisratedCategoryIV(pressurizedvent),

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

exhaustfansorothermechanicalventilationdevices.RefertotheNational

FuelGasCodefordealingwithotherconditions.

Louver allowance

The free area of openings means the area after reduc-

tion for any installed louvers or grilles

.Besureto

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.

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