Bosch 125B LP Specifications download pdf (Page 15)

6 720 644 951 (2014/11)330 PN

Installation instructions | 15

Fig. 11 Masonry chimney

[1] Listed vent cap

[2] Vent connector

[3] Establish a one foot rise before any elbows

[A] Gas vent

4.7 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 should conform to CGA B149

INSTALLATION CODES and/or local installation codes.

Mount regulator to gas inlet pipe as shown in Fig. 12. The arrow

on the back of the regulator indicates the direction of gas flow

and should point toward the appliance.

Fig. 12 Installation of Gas Pressure Regulator

Note: The 330 PN comes with a gas pressure regulator. Failure

to install or altering the gas pressure regulator will be a violation

of CSA certification of the unit. The regulator supplied with the

heater is preset for the gas shown on the rating plate to the

correct pressure. It is an appliance level regulator designed for

(low inlet) pressure (less than 1/2 Psig or 14" W.C.).

GAS CONNECTIONS

▶ Install a manual gas shut off valve, on the gas supply line.

▶ Install a union when connecting gas supply.

▶ Attach the appliance regulator to the inlet gas pipe.

▶ The minimum diameter required for any appliance

connector used is ½ ”.

▶ 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.

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.

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Bosch 125B LP Specifications Page 15

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