Equipment Base
The heater should be mounted on a level, structurally
sound surface. The heater is approved for installation
on a combustible surface but must NEVER be
installed on carpeting. Gas-fueled equipment installed
in enclosed parking garages must be located at least
18 in. above the floor.
In addition, the heater shall be installed such that the
gas ignition system components are protected from
water (dripping, spraying, rain, etc.) during appliance
operation or service (circulator replacement, control
replacement, etc.).
If the heater needs to be secured to the ground, use
the hole pattern shown in Fig. 5, following local codes.
Clearances
Indoor Installations
When installed according to the listed minimum clear-
ances from combustible construction, these heaters
can still be serviced without removing permanent
structural construction around the heater. However, for
ease of servicing, a clearance of at least 30 in. in front,
24 in. on one side, at least 36 in. on the rear and 10 in.
above the top of the heater is required. This will allow
8
Heater Side
Minimum Clearance
from Combustible
Surfaces
Minimum
Service
Clearance
Floor*
0"
0"
Rear
12"
36"
One Side
1"
1"
Opposite Side
1"
24"
Top
0"
10"
Front
Open
30"
Vent
1"
1"
* DO NOT install on carpeting
Table C: Clearances – Indoor Installations
INSTALLATION
Installation Codes
Installations must follow these codes:
•
Local, state, provincial, and national codes, laws,
regulations and ordinances
•
National Fuel Gas Code, ANSI Z223.1/NFPA 54 –
latest edition (NFGC)
•
National Electrical Code, ANSI/NFPA 70 - latest
edition (NEC)
•
Standard for Controls and Safety Devices for
Automatically Fired Boilers, ANSI/ASME CSD-1,
(CSD-1) when required
•
For Canada only: CAN/CSA B149 Natural Gas
and Propane Installation Code and CSA C22.1
C.E.C. Part 1 (C22.1)
CAUTION:
This heater should be located in an
area where water leakage will not result in damage
to the area adjacent to the appliances or to the
structure. When such locations cannot be avoided, it
is recommended that a suitable catch pan,
adequately drained, be installed under the
appliance. The pan must not restrict air flow.
Fig. 5: Anchor Hole Locations
Summary of Contents for 2503
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