U.S. Boiler Company PVG3, Installation, Operating And Service Instructions

7

WARNING

If you do not follow these instructions exactly, 

a  fire  or  explosion  may  result  causing  property 

damage or personal injury.

DANGER

Do not install boiler where gasoline or other 

flammable  vapors  or  liquids,  or  sources  of 

hydrocarbons (i.e. bleaches, cleaners, chemicals, 

sprays, paint removers, fabric softeners, etc.) are 

used or stored.

NOTICE

Due to the low water content of the boiler, mis-

sizing of the boiler with regard to the heating 

system load will result in excessive boiler cycling 

and accelerated component failure.  U.S. Boiler 

DOES NOT warrant failures caused by mis-sized 

boiler applications.  DO NOT oversize the boiler to 

the system.  Modular boiler installations greatly 

reduce the likelihood of boiler oversizing.

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

, ANSI Z223.1/NFPA 54, and/or 

Natural 

Gas and Propane Installation Code

, CAN/CSA B149.1. 

Where required by authority having jurisdiction, 

installation must conform to Standard for 

Controls and 

Safety Devices for Automatically Fired Boilers

, ANSI/

ASME CSD-1. 

B.

Appliance is design certified

 for installation on 

combustible flooring.  Do not install boiler on 

carpeting.

C.

Provide clearance

 between boiler jacket and 

combustible material in accordance with local fire 

ordinance. Refer to Figure 1 for minimum listed 

clearance from combustible material. Recommended 

service clearance is 24 (610 mm) 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.  Floor 

must be able to support weight of boiler, water and all 

additional system components.

I.  PRE-INSTALLATION

E.

Protect gas ignition system components

 from water 

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

and service (circulator replacement, condensate trap, 

control replacement, etc.).

F.

Provide combustion and ventilation air

 in accordance 

with the section “Air for Combustion and Ventilation,” 

of the 

National Fuel Gas Code

, ANSI Z223.1/NFPA 54, 

or Sections 8.2, 8.3 or 8.4 of 

Natural Gas and Propane 

Installation Code

, CAN/CSA-B149.1, or applicable 

provisions of local building codes.

WARNING

Adequate combustion and ventilation air must 

be provided to assure proper combustion.

The following guideline is based on the 

National Fuel Gas 

Code

, ANSI Z223.1/NFPA 54.

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 

rating of 1 perm or less with openings gasketed 

and sealed, and;

b.  Weather-stripping has been added on openable 

windows and doors, and;

c.  Caulking or sealants applied in joints around 

window and door frames, between sill plates and 

floors, between wall-ceiling joints, between wall 

panels, at plumbing and electrical penetrations, 

and at other openings.

5.  For boiler located in an 

unconfined space in a 

building of

other than unusually tight construction

, 

adequate combustion and ventilation air is normally 

provided by fresh air infiltration through cracks 

around windows and doors.