GSA
Gas-Fired Steam Boilers –
Boiler Manual
3
Part Number 550-110-738/1012
1 Prepare boiler location
continued
Clearances
Recommended
SERVICE
clearances
1. Provide minimum clearances for cleaning and servicing the
boiler and for access to controls and components as listed in
the table at right.
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.
Figure 1
Alcove installations
Minimum clearances to
COMBUSTIBLE
materials
General clearances
— All installations
1. See the table at right for clearances to boiler and system
components.
2. Clearances to Type B vent materials are as specified by the
vent manufacturer.
Alcove (not closet) installations only
GSA boilers are not approved for closet installation
–– only for alcove installation, with minimum
clearances to combustible surfaces as shown in the
table at right. See Figure 1. The front side must be
completely open — that is, a 3-walled room.
Clearance for service
Minimum
Clearance to boiler jacket
Top
(for cleaning flueways)
46”
Front
(for access to controls and components)
18”
Back
6”
Left side
(for cleaning and servicing)
24”
Right side
6”
Clearance to combustible materials
Minimum
Clearance to boiler jacket
Top
46”
Front
(provides means of access)
3”
Back
6”
Left side
(provides means of access)
4”
Right side
4”
Clearance to piping and vent components
Water and steam pipes
1/2”
Vent pipe
(other than Type B vent)
6”
Type B vent piping
Per B vent
manufacturer
Vent damper
6”