Bosch 520-PN-L Specifications download pdf (Page 17)

6 720 644 942 (2014/11)520 HN

Installation instructions | 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.

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

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.

Altitude Nat. Gas inches Liquid Propane

2 000 ft - 4 500 ft 4.6” 8.4”

Table 6 Above 4.500 ft consult your local gas provider

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 35 36

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Bosch 520-PN-L Specifications Page 17