7 Gas connections (continued)

Installation & Operation Manual

￿WARNING

￿WARNING

Failure to apply pipe sealing compound as detailed in this manual can result in severe personal injury, death, or substantial property damage.

Use two wrenches when tightening gas piping at boiler (FIG. 7-4), using one wrench to prevent the boiler gas line connection from turning. Failure to support the boiler gas connection pipe to prevent it from turning could damage gas line components.

Natural gas:

Pipe sizing for natural gas

1.Refer to Table 7A for pipe length and diameter. Based on rated boiler input (divide by 1,000 to obtain cubic feet per hour).

a.Table 7A is only for natural gas with specific gravity 0.60 inches, with a pressure drop through the gas piping of 0.5 inches w.c.

b.For additional gas pipe sizing information, refer to ANSI Z223.1 (or B149.1 for Canadian installations).

Figure 7-4Inlet Pipe with Backup Wrench

USE BACKUP WRENCH TO

PREVENT PIPE FROM ROTATING

Natural gas supply pressure requirements

1.Pressure required at the gas valve inlet pressure port:

Maximum 14 inches w.c. (3.5 kPa) with no flow (lockup) or with boiler on.

Minimum 4 inches w.c. (.99 kPa) with gas flowing (verify during boiler startup).

2.Install 100% lockup gas pressure regulator in supply line if inlet pressure can exceed 14 inches w.c. (3.5 kPa) at any time. Adjust lockup regulator for 14 inches w.c. (3.5 kPa) maximum.

Propane Gas:

NOTICE

Maximum inlet gas pressure must not

exceed the value specified. Minimum

 

value listed is for the purposes of input

 

adjustment.

￿WARNING

Knight XL boilers are typically shipped ready to fire on natural gas. Check boiler rating plate to determine which fuel the boiler is set for. If set to natural gas, it may be converted to LP by installing an orifice or by making a gas valve adjustment (see pages 13 and 14). In order to operate on LP gas, an orifice MUST BE installed or a gas valve adjustment MUST BE made. Failure to comply could result in severe personal injury, death, or substantial property damage.

Pipe sizing for propane gas

1.Contact gas supplier to size pipes, tanks, and 100% lockup gas pressure regulator.

Propane Supply Pressure Requirements

1.Adjust propane supply regulator provided by the gas supplier for 14 inches w.c. (3.2 kPa) maximum pressure.

2.Pressure required at gas valve inlet pressure port:

Maximum 14 inches w.c. (3.2 kPa) with no flow (lockup) or with boiler on.

Minimum 8 inches w.c. (1.9 kPa) with gas flowing (verify during boiler startup).

￿ WARNING

Ensure that the high gas pressure regulator

 

is at least 10 feet (3 m) upstream of the

appliance.

47

 

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Lochinvar 400, 801 operation manual Natural gas, Propane Gas

400, 801 specifications

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