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Hydronic Heating Boilers and
Domestic Water Heaters
6
INSTALLATION
This unit meets the safe lighting performance criteria with the
gas manifold and control assembly provided, as specified in
the ANSI standards for gas-fired units, ANSI Z21.13/CSA 4.9
and ANSI Z21.10.3/CSA 4.3.
LOCATING UNIT
1. Maintain all clearances from combustible construction
when locating unit. See Clearances from Combustible
Construction, this page.
2. Locate the unit so that if water connections should leak,
water damage will not occur. When such locations cannot
be avoided, install a suitable drain pan that is well-drained
under the unit. The pan must not restrict combustion air
flow. The appliance manufacturer is not responsible for
water damage in connection with this unit, or any of its
components.
3. Install indoor units so that the ignition system components
are protected from any water while operating or during
service.
4. Appliances located in a residential garage and in adjacent
spaces that open to the garage and are not part of the living
space of a dwelling unit must be installed so that all
burners and burner ignition devices have a minimum
clearance of not less than 18" (46 cm) above the floor. The
appliance must be located or protected so that it is not
subject to physical damage by a moving vehicle.
5. DO NOT install this appliance in any location where
gasoline or flammable vapors are likely to be present.
6. You must install unit on a level, non-combustible floor.
7. Do not install unit directly on carpet or other combustible
material. A concrete-over-wood floor is not considered
non-combustible. Maintain required clearances from
combustible surfaces.
If installing unit in an area with a combustible floor, you
must use a special combustible floor base. See Base for
Combustible Floors, on page 7.
8. For outdoor models, you must install an optional vent cap.
Instructions for mounting the vent cap are included in the
venting section. Do not install outdoor models directly on
the ground. You must install the outdoor unit on a concrete,
brick, block, or other non-combustible pad. Outdoor
models have additional special location and clearance
requirements. See Outdoor Installation Venting, page 26. A
wind proof cabinet protects the unit from weather.
Clearances from Combustible
Construction
Maintain minimum specified clearances for adequate
operation. Allow sufficient space for servicing pipe
connections, pump and other auxiliary equipment, as well as
the unit. See rating plate for specific service clearance
requirements.
Right Side 3" (7.5 cm)
Rear 3" (7.5 cm) (3" min.
from any surface)
Left Side 6" (15cm) (24" (0.61m)
suggested for service)
Front Alcove* (30" (0.76m)
suggested for service)
Top 3" (7.5cm)
Flue 1" (25.4mm)
Hot Water Pipes 1" (25.4mm)
*An Alcove is a closet without a door.
Note: No additional clearance is needed on the right side of the
unit for the observation port. An observation port is located on
both the right and left side of the unit.
No additional clearances for combustibles are needed
for use of the Direct Vent (DV) air inlet assembly.
FIG. 2 Clearances from Combustible Construction
3 INCH MINIMUM FROM UNIT TO WALL