Bosch C1210ES Specifications download pdf (Page 23)

Installation instructions | 23

6 720 644 887 (2014/11)C 1210 ES/ESC

4.4 Combustion air requirements

Twin pipe and Concentric pipe

The water heater is designed as a sealed combustion appliance. It is

recommended that the combustion air be provided by a dedicated 3” or

4” pipe from the outside (twin pipe) or by connecting to the Concentric

vent kit (see Fig.8). The combustion air pipe may be PVC or any other

rigid sealed 3" or 4" pipe. The combustion air piping must pitch down 1/

4 inch per foot towards termination to prevent rain water from entering

the appliance. In twin pipe penetrations, the combustion air inlet,

whether terminating vertically or horizontally, must be located in such a

manner as to provide a minimum 3 foot clearance from the exhaust vent

termination. See Fig.9 and 10 Letter I, page 15.

For the maximum length of the combustion air pipe, see Tables 8 &9.

Single pipe

Note: This appliance requires 9950 cubic feet of available combustion

air, or a minimum of 1243 square feet of space with an 8 foot ceiling to

operate. If the large amount of air space, which equates to about half of

most average sized homes, is not available, the appliance must pull air

from the outside (see twin pipe above).

Although it is permissible to draw combustion air from the inside, it is not

the manufacturer’s recommended installation method. Always install a 3

inch 90° elbow on the top of the combustion air inlet adaptor to prevent

foreign objects from falling into the unit.

If a single pipe installation is utilized, follow guidelines below for

providing adequate combustion air for the water heater as well as any

other appliances that may consume air in the same space. Always follow

local codes if they are more stringent and regulations.

• Appliances located in unconfined spaces:

– a) An unconfined space is one whose volume is greater than 50

cubic feet (1.42 cubic meter) per 1000 Btu per hour (292.81

Watts) of the combined rating of all appliances installed in the

space. That would be 9950 cubic feet (281.8 cubic meters) for

the water heater alone.

– b) In unconfined spaces in buildings of conventional frame,

masonry, or metal construction, infiltration air is normally

adequate to provide air for combustion.

• Appliances located in confined spaces:

The confined space must be provided with two permanent openings,

one commencing within 12 inches (304.8mm) of the top and one

commencing within 12 inches (304.8mm) of the bottom of the

enclosure. Each opening must have a minimum free area of one

square inch per:

– 1000 BTU/hr (292.81 Watts) if all air is taken from inside the

building

– 2000 BTU/hr (585.62 Watts) if all air is taken from the outside by

horizontal ducts

– 4000 BTU/hr (1171.24 Watts)if all air is taken from the outside

by direct openings or vertical ducts

Or the confined space must be provided with one permanent opening or

duct that is within 12 inches (304.8mm) of the ceiling of the enclosure.

This opening must have a minimum free area of one square inch per:

– 3000 BTU/hr (878.43 Watts) if all air is taken from the outside by

a direct opening or vertical duct.

Louvers, grills and screens have a blocking effect, when used, increase

the sizes of your openings by 300% for wood louvers (as wood type will

reduce the free air by 75%) and 43% for metal louvers (as metal will

reduce the free air by 30%). Refer to the National Fuel Gas Code for

complete information. In buildings of tight construction all air should be

taken from outside.

4.5 Proper location for installing your heater

Carefully select the location of the water heater. For your safety and for

proper heater operation, you must provide combustion air to the heater

and a proper exhaust vent system.

Follow the guidelines below:

▶ 1. Locate the heater where venting, gas and plumbing connections

are feasible and convenient.

▶ 2. The hot water lines should be kept short and insulated to save

energy. Centrally locating the water heater is recommended to keep

hot water distribution times even throughout the structure.

4.6 Heater placement and clearances

The water heater design is approved for installation on a combustible

wall (see chapter 4.7 Mounting installation) provided the floor covering

below the heater is noncombustible.

For installations in an alcove or closet, maintain the minimum clearances

to combustible and non-combustible materials. See fig. 6, page 10.

4.7 Mounting installation

CAUTION:

▶ In areas where outside temperatures routinely come

close to freezing, sealed combustion operation is

required. Use a concentric termination or separate

terminations for combustion and vent, which must

be installed on the same wall or roof surface,

however never facing the direction of prevailing

winds. Failure to do so may result in heat exchanger

freezing up and bursting. This failure is not covered

under the manufacturer's warranty.

CAUTION:

▶ When installed in an environment where corrosive

chemicals or dirty air (e.g. hair salons, car washes)

are present the twin pipe system is required.

CAUTION:

▶ Terminations must prevent rain and debris from

entering the combustion air and exhaust vent piping.

WARNING:

▶ The water in this water heater is cold and always

remains cold except for the times the burner is on. In

the event of power outage in conjunction with

freezing temperatures, it is recommended that the

heater be drained.

See chapter 7.2, page 37 “Winterizing” for draining

instructions.

WARNING:

▶ Flammable materials, gasoline, pressurized

containers, or any other items or articles that are

potential fire hazards must NOT be placed on or

adjacent to the heater. The appliance area must be

kept free of all combustible materials, gasoline and

other flammable vapors and liquids.

WARNING:

before mounting appliance:

▶ Check that there are no loose or damaged parts

inside the appliance.

▶ Confirm that the gas type of the heater matches the

gas supply you will be connecting the heater, See

Fig.2, page 8.

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Bosch C1210ES Specifications Page 23

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