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Bosch C 1210 ES/ESC Manual page 25

Natural gas liquefied petroleum gas indoor residential and commercial models
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In Canada: The Installation must conform to CGA B149 INSTALLATION
CODES and/or local installation codes.
▶ DO NOT connect to an unregulated or high pressure
propane line or to a high pressure commercial natural
gas line.
▶ 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
▶ 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
Gas supply
[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.
▶ 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.
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
C 1210 ES/ESC
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 31 for the procedure to
measure gas pressure. Proper gas pressure must be confirmed at time of
Fig. 30
Inlet gas particle screen (included)
Gas piping
Installation instructions | 25
6 720 644 887 (2013/02)



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