3
Part Number 550-142-320/0720
GWA
Series 3
Gas-Fired Water Boilers –
Boiler Manual
Service clearances
1. Provide minimum clearances for cleaning and servicing the
boiler and for access to controls and components as listed
in the table below:
2. Provide at least screwdriver clearance to jacket front panel
screws for removal of front panel for inspection and minor
service. If unable to provide at least screwdriver clearance,
install unions and shutoff valves in system so boiler can be
moved for servicing.
Clearances
Minimum clearance to combustible materials
1. Hot water pipes must be at least ½” from combustible
material.
2. Single-wall vent pipe must be at least 6 inches from
combustible material.
3. Type B double-wall metal vent pipe — See vent manu-
facturer’s recommendation for clearances to combustible
material.
Installations must follow these codes:
• Local, state, provincial, and national codes, laws, regula-
tions and ordinances.
• National Fuel Gas Code, ANSI Z223.1 – latest edition.
• Standard for Controls and Safety Devices for Automatically
Fired Boilers, ANSI/ASME CSD-1 – latest edition, when
required.
• National Electrical Code – latest edition.
Certification
The GWA boiler gas manifold and controls met
safe operating and other performance criteria
when boiler underwent tests specified in ANSI
Z21.13 – latest edition.
Before locating the boiler:
o
Check for nearby connection to:
• System water piping
• Venting connections
• Gas supply piping
• Electrical power
o
Check area around boiler. Remove any combustible materi-
als, gasoline and other flammable liquids.
Failure to keep boiler area clear and free of com-
bustible materials, gasoline and other flammable
liquids and vapors can result in severe personal
injury, death or substantial property damage.
o
Boiler must be installed so that gas control system com-
ponents are protected from dripping or spraying water or
rain during operation or service.
o
If new boiler will replace existing boiler, check for and cor-
rect system problems, such as:
1. System leaks causing oxygen corrosion or section
cracks from hard water deposits.
2. Incorrectly-sized expansion tank.
3. Lack of antifreeze in boiler water causing system and
boiler to freeze and leak.
Codes & checklist
1 Prepare boiler location
Table 1 Minimum foundation size
Boiler
model
Minimum
foundation
length
Minimum
foundation
width
GWA-038
25”
12”
GWA-067
25”
12”
GWA-100
25”
15”
GWA-133
25”
18”
GWA-166
25”
21”
GWA-200
25”
24”
GWA-233
25”
27”
Clearances from combustible materials:
Minimum
Front (provide means of access)
3"
Back
7"
Left side (provide means of access)
6"
Right side
2"
Top
GWA-038 to GWA-100
GWA-133
GWA-166
GWA-200
GWA-233
H
35”
35½”
38½”
39¾”
42½”
Service clearances:
Minimum
Top (for cleaning flueways)
35"
Front (for access to controls and components)
18"
Back
7"
Left side (for cleaning and servicing)
24"
Right side
7"
