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Provide clearances for service
access — RECOMMENDED
1. See Figure 1 for recommended service clearances.
2. If you do not provide minimum service clearances
shown, it might not be possible to service the boiler
without removing it from the space.
3. Clearance D, Figure 1 allows for the installation of pip-
ing as shown in Figure 8, page 12 plus a close nipple
and elbow.
#LOSET OR SMALLENCLOSURE INSTALLATIONS
WHICHDONOTPROVIDEATLEASTTHESERECOM-
MENDEDCLEARANCESREQUIRETHESPECIALLY
SIZED AND PLACED AIR OPENINGS SHOWN IN
&IGURE
.
Provide clearances from combustible
materials — REQUIRED
1. See Figure 2 for REQUIRED minimum clearances. ALL installa-
tion must provide at least these minimums.
2. Hot water pipes — at least ½” from combustible materials.
3. Vent pipe — at least ³⁄₁₆” from combustible materials.
4. Clearance D, Figure 2 allows for the installation of a reducer bush-
ing (155 only) and elbow. Other piping may require additional
clearance.
5. See Figure 1 for service clearance minimums.
#LOSET OR SMALLENCLOSURE INSTALLATIONSWHICH DO
NOTPROVIDEATLEASTTHERECOMMENDEDSERVICECLEAR-
ANCESSHOWNIN&IGURE
REQUIRETHESPECIALLYSIZED
ANDPLACEDAIROPENINGSSHOWNIN&IGURE.
&IGURE REQUIRED minimum clearances
(
ALLDIMENSIONSAREININCHES)
&IGURE RECOMMENDED service clearances
(
ALLDIMENSIONSAREININCHES)
Boiler location (continued)
A Provide combustion air/ventilation openings per Figure 22, page 23 or as otherwise
directed in this manual or by applicable codes.
If the installation does not
provide the minimum clearances in Figure 1, then the enclosure MUST HAVE air
openings located per Figure 2, above. Each of these air openings must have free area of
at least 1 square inch per 1,000 MBH of boiler input.
B Left side clearance to combustibles = .50 inches minimum
C Top of boiler clearance to combustibles = 10.5 inches minimum
D Right side clearance to combustibles = 7 inches minimum
E Bottom of boiler clearance to combustibles = 7 inches minimum (must be 18 inches
above floor for garage installations)
F Clearance in front of the boiler = 0.5 inches, but 24 inches minimum required for
service
G Air openings must be located in the FRONT of the enclosure, as shown. They must be
no more than 12 inches from the floor or ceiling, as shown.
H Vent pipe must be minimum 3/16 inch from combustibles. Opening in combustible
wall, floor, ceiling or roof must be 3/8” larger than flue pipe diameter, fitted with
galvanized steel thimble, or larger if required by codes or as specified by vent pipe
manufacturer.
A Provide combustion air/ventilation openings per Figure 22, page 23 or as
otherwise directed in this manual or by applicable codes. NOTE: If the
installation does not provide the minimum clearances in this illustration,
then the enclosure must have air openings located and sized per Figure 2.
B Left side service clearance = 3 inches minimum
C Service clearance above top of boiler = 12 inches minimum
D Right side service clearance = 14 inches minimum
E Service clearance below the boiler = 12 inches minimum
F Service clearance in front of the boiler = 24 inches minimum
ADDITIONAL service clearance may be
needed, depending on how piping is routed
to the boiler.
Part number 550-142-122/0513
7
TM
GAS-FIRED WATER BOILER — Boiler Manual
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