Gas Piping & Connections - Bosch 520-HN -L Manual

16 | Installation instructions
GAS VENT TERMINATIONS FOR LISTED VENT CAPS
Roof pitch
Flat to 6/12
6/12 to 7/12
Over 7/12 to 8/12
Over 8/12 to 9/12
Over 9/12 to 10/12
Over 10/12 to 11/12
Over 11/12 to 12/12
Over 12/12 to 14/12
Over 14/12 to 16/12
Over 16/12 to 18/12
Over 18/12 to 20/12
Over 20/12 to 21/12
Table 5
Fig. 12 Masonry chimney
[1] Listed vent cap
[2] Vent connector
[3] Establish a one foot rise before any elbows
[A] Gas vent
6 720 644 942 (2014/11)
H (minimum) feet meters
1.0 0.30
1.25 0.38
1.5 0.46
2.0 0.61
2.5 0.76
3.25 0.99
4.0 1.22
5.0 1.52
6.0 1.83
7.0 2.13
7.5 2.27
8.0 2.44
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.).
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.
520 HN