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SECTION 2: BOILER INSTALLATION
STEP 1: LOCATING AND SETTING THE BOILER
➤PROCEDURE A: Check that provisions for combustion air are in accordance with National Fuel Gas
Code ANSI Z223.1-latest edition and all applicable local codes. In Canada, follow CAN/CGA B149(.1 or .2)
installation codes.
58" FOR GB250-S-8 THRU GB250-S-9
1
1
1
1
1
1
11
1
1
1
1
1
RECOMMEND
MORE FOR
ACCESS TO
VENT DAMPER
POSITION
INDICATOR
12"
* TOP
6"
6"
VENT DAMPER
12"
18"
* 52" FOR GB250-S-5L THRU GB250 S-7
➤PROCEDURE B:
Check minimum
clearances to
combustibles are
proper as shown. Local
requirements may
specify greater
clearances & must be
adhered to.
Boiler shall be install-
ed such that the gas
ignition system com-
ponents are protected
from water (dripping,
spraying, rain, etc.)
during appliance oper-
ation and service.
WARNING: Never install boiler on combustible flooring without combustible flooring pan or on carpeting
as heat damage and/or fire may result.
FIGURE 2.1
5
Step 1 Continued On Next Page
NOTE: Do not loosen tie rods on absorption unit. They accommodate thermal expansion. Loss of boiler
structural integrity and water leaks/damage may result.
CAUTION: Locate boiler so horizontal connecting flue pipe is as short as possible. Maximize height of
vertical flue connector.