U.S. Boiler Company INDEPENDENCE IN3PV, Installation & Operating Manual

4

I. Pre-Installation

F.

  Provide combustion and ventilation air in accordance 

with applicable provisions of local building codes, or 

National Fuel Gas Code

, NFPA 54/ANSI Z223.1, Air 

for Combustion and Ventilation.

The following guideline is based on the 

National Fuel 

Gas Code

, NFPA 54/ANSI Z223.1.

1.  Determine volume of space (boiler room). Rooms 

communicating directly with space (through 

openings not furnished with doors) are considered 

part of space.

  Volume [ft³] = Length [ft] x Width [ft] x Height [ft]
2.  Determine Total Input of all appliances in space. 

Round result to nearest 1,000 Btu per hour (Btuh).

3.  Determine type of space. Divide Volume by Total 

Input.
a.  If result is greater than or equal to 50 ft³ per 

1,000 Btuh, space is considered an 

unconfined 

space

.

b.  If result is less than 50 ft³ per 1,000 Btuh, space 

is considered a 

confined space

.

4.  Determine building type. A building of 

unusually 

tight construction

 has the following characteristics:

a.  Walls and ceiling exposed to outside atmosphere 

have a continuous water vapor retarder with a 

A

.  Installation must conform to the requirements of 

the authority having jurisdiction. In the absence of 

such requirements, installation must conform to the 

National Fuel Gas Code

, NFPA 54/ANSI Z223.1. 

Where required by the authority having jurisdiction, the 

installation must conform to the 

Standard for Controls 

and Safety Devices for Automatically Fired Boilers

, 

ANSI/ASME CSD-1.

B.

  Boiler is design certified for installation on combustible 

flooring. The boiler must not be installed on carpeting.

C.

  Provide clearance between boiler jacket and 

combustible material in accordance with local fire 

ordinance. Refer to Table 1 for minimum listed 

clearance from combustible material. Recommended 

service clearance is 24 inches from left side, right 

side and front. Service clearances may be reduced to 

minimum clearances to combustible materials.

D.

  Install on level floor. For basement installation provide 

solid base, such as concrete, if floor is not level or if 

water may be encountered on floor around boiler.

E.

  Protect gas ignition system components from water 

(dripping, spraying, rain, etc.) during boiler operation 

and service (circulator replacement, condensate trap, 

control replacement, etc.).

Table of Contents

I. Pre-Installation .................................. 4

II.  Unpack Boiler ................................... 5

III.  Steam Piping and Trim ...................... 6

IV.  Gas Piping ......................................... 8

V. Venting ........................................... 10

VI. Electrical ......................................... 16

VII.  System Start-up ............................... 17

VIII.  Service Instructions ......................... 25

IX.  Repair Parts ..................................... 32

  Appendix A - Figures ....................... 40

  Appendix B - Tables ........................ 41

WARNING

Boiler materials of construction, products of combustion and the fuel contain alumina, silica, heavy metals, 

carbon monoxide, nitrogen oxides, aldehydes and/or other toxic or harmful substances which can cause 

death or serious injury and which are known to the state of California to cause cancer, birth defects and 

other reproductive harm.  Always use proper safety clothing, respirators and equipment when servicing 

or working nearby the boiler.
Failure to follow all instructions in the proper order can cause personal injury or death.  Read all instructions, 

including all those contained in component manufacturers manuals which are provided with the boiler 

before installing, starting up, operating, maintaining or servicing.

Keep boiler area clear and free from combustible materials, gasoline and other flammable vapors or 

liquids.
All cover plates, enclosures and guards must be in place at all times.