Bosch 520-HN -L Manual page 17

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 ¾" NPT.
▶ 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.
When 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.
DANGER:
▶ 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.
HIGH ALTITUDE INSTALLATION
The pressure regulator provided with the heater is adjusted to
deliver the proper gas pressure (as indicated on the rating plate
and in the manual for altitude up to 2000 feet (660 meters)
above sea level. On appliances being installed above 2000 ft
(660 meters) elevation, the inlet gas pressure should be set at
installation to the value shown below.
Note: The gas pressures specified below refer to pressures
taken at the pressure tap on the gas inlet pipe just above the
regulator. See chapter 4.7 for measuring gas pressure.
MAXIMUM INLET GAS FLOW PRESSURE SETTING
Altitude Nat. Gas inches
2 000 ft - 4 500 ft
Table 6 Above 4.500 ft consult your local gas provider
520 HN
Liquid Propane
4.6" 8.4"
Installation instructions | 17
6 720 644 942 (2014/11)