Bosch C1210ES Specifications download pdf (Page 25)

Installation instructions | 25

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

4.8 Gas piping & connections

Before connecting the gas supply, check the rating plate on the right side

of the heater to be sure that the heater is rated for the same gas to which

it will be connected.

In the United States: The installation must conform with local codes or,

in the absence of local codes, the National Fuel Gas Code ANSI Z223.1/

NFPA 54.

In Canada: The Installation must conform to CGA B149 INSTALLATION

CODES and/or local installation codes.

GAS CONNECTIONS

▶ Install a manual gas shut off valve on the gas supply line within easy

reach of the appliance.

▶ Install a union when connecting gas supply.

▶ The minimum internal diameter required for any appliance connector

is ¾ ”, see chapter 4.8.1 for more details on pipe sizing.

▶ Undersized flexible appliance connector not permitted.

▶ National Fuel Gas Code requires that a sediment trap (drip leg) be

installed on gas appliances not so equipped. The drip leg must be

accessible and not subject to freezing conditions. Install in

accordance with the recommendations of the serving gas supplier,

see fig. 2.

Fig. 29 Gas connection

[1] Gas supply

[2] Cap

[LA] Minimum 3"

Once connections are made, check for gas leaks at all joints. Apply some

gas leak detection solution to all gas fittings. Bubbles are a sign of a leak.

A combustible gas detector may also be used to detect for leaks.

GAS LINE SIZING

The gas supply piping for a single heater should be sized for a maximum

draw of 225,000 BTUH. Measure the length of gas supply line from the

building's gas main to the heater and use the chapter 4.8.1 and 4.8.2,

page 26 or the gas line manufacturer’s sizing tables to determine the

pipe diameter necessary. If there are more gas drawing appliances on

the line, size the gas line according to the total maximum amount of BTU

draw input rating of for all appliances combined.

Note: Undersizing the gas line may result in diminished hot water flow

rate and temperature. See chapter 4.14, page 32 for the procedure to

measure gas pressure. Proper gas pressure must be confirmed at time of

installation.

Fig. 30

[1] Inlet gas particle screen (included)

[2] Gas piping

WARNING:

▶ DO NOT connect to an unregulated or high pressure

propane line or to a high pressure commercial

natural gas line.

WARNING:

▶ The heater must be isolated from the gas supply

piping system during any pressure testing of that

system at test pressures equal to or more than 0.5

psig. If overpressure has occurred, such as through

improper testing of the gas lines or malfunction of the

supply system, the gas valve must be checked for

safe operation.

WARNING:

▶ If you have a leak, shut off the gas. Tighten

appropriate fittings to stop leak. Turn the gas on and

check again with a gas leak detection solution. Never

test for gas leaks using a match or flame.

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Bosch C1210ES Specifications Page 25

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