Bosch 520-PN-L Specifications download pdf (Page 16)

6 720 644 942 (2014/11) 520 HN

16 | Installation instructions

Fig. 12 Masonry chimney

[1] Listed vent cap

[2] Vent connector

[3] Establish a one foot rise before any elbows

[A] Gas vent

4.6 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. 13. The arrow

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

and should point toward the appliance.

Fig. 13 Installation of Gas Pressure Regulator

Note: The 520 HN 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 VENT TERMINATIONS FOR LISTED VENT CAPS

Roof pitch H (minimum) feet meters

Flat to 6/12 1.0 0.30

6/12 to 7/12 1.25 0.38

Over 7/12 to 8/12 1.5 0.46

Over 8/12 to 9/12 2.0 0.61

Over 9/12 to 10/12 2.5 0.76

Over 10/12 to 11/12 3.25 0.99

Over 11/12 to 12/12 4.0 1.22

Over 12/12 to 14/12 5.0 1.52

Over 14/12 to 16/12 6.0 1.83

Over 16/12 to 18/12 7.0 2.13

Over 18/12 to 20/12 7.5 2.27

Over 20/12 to 21/12 8.0 2.44

Table 5

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 520-PN-L Specifications Page 16

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