Burnham Series 8H/8HE Boiler Instruccion De Instalación

V. Gas Piping

Failure to properly pipe gas supply to boiler may

result in improper operation and damage to the

boiler or structure. Always assure gas piping is

absolutely leak free and of the proper size and

type for the connected load.

An additional gas pressure regulator may be

needed. Consult gas supplier.

Size gas Piping. Design system to provide adequate gas

supply to boiler. Consider these factors:
1. Allowable pressure drop from point of delivery to

boiler. Maximum allowable system pressure is ½

psig. Actual point of delivery pressure may be less;

contact gas supplier for additional information.

Minimum allowable gas valve inlet pressure is

indicated on rating label.

2. Maximum gas demand. Table 5 lists boiler input

rate. Also consider existing and expected future gas

utilization equipment (i.e. water heater, cooking

equipment).

3. Length of piping and number of fittings. Refer to

Table 6 for maximum capacity of Schedule 40 pipe.

Table 7 lists equivalent length for standard fittings.

Boiler

Model

Rated Capacity

(cubic feet per hour)

Gas

Connection

Size

Natural

LP / Propane

805H

252

100.8

806H

315

126.0

807HE

340

136.0

808HE

410

164.0

809HE

460

184.0

810HE

505

202.0

Table 5: Rated Input

4. Specific gravity of gas. Gas piping systems for

gas with a specific gravity of 0.70 or less can be

sized directly from Table 6, unless authority having

jurisdiction specifies a gravity factor be applied.

For specific gravity greater than 0.70, apply gravity

factor from Table 8. If exact specific gravity is not

shown choose next higher value.

For materials or conditions other than those listed

above, refer to the National Fuel Gas Code,

NFPA 54/ANSI Z223.1 and/or CAN/CSA B149.1

Installation Codes, or size system using standard

engineering methods acceptable to authority having

jurisdiction.

Failure to use proper thread compounds on all

gas connectors may result in leaks of flammable

gas.

Gas supply to boiler and system must be

absolutely shut off prior to installing or servicing

boiler gas piping.

Connect boiler gas valve to gas supply system.

1. Use methods and materials in accordance with local

plumbing codes and requirements of gas supplier. In

absence of such requirements, follow the National

Fuel Gas Code, NFPA 54/ANSI Z223.1 and/or

CAN/CSA B149.1 Installation Codes.

2. Use thread (joint) compound (pipe dope) resistant to

action of liquefied petroleum gas.

3. Install sediment trap, ground-joint union and manual

shut-off valve upstream of boiler gas valve and

outside jacket. See Figure 22.

4. All above ground gas piping upstream from

manual gas valve must be electrically continuous

and bonded to a grounding electrode. Do not use

gas piping as a grounding electrode. Refer to the

National Electrical Code, ANSI/NFPA 70 and/or

CSA C22.1 Electrical Code.

USA boilers built for installation at altitudes greater than 2,000 feet above sea level have been specially

orificed to reduce gas input rate 4 percent per 1,000 feet above sea level per the National Fuel Gas Code,

NFPA 54/ANSI Z223.1, Section 8.1.2 and Appendix F. Canadian boilers’ orifice sizing is indicated on the

rating label. High altitude boiler models are identifiable by the model number’s tenth digit on the rating label.

(4=2000’ - 4500’, 5= 2000’ - 5000’)