Installation & Operation Manual
8
1
Determine boiler location
Provide air openings to room:
The Crest alone in boiler room
1. No air ventilation openings into the boiler room are
needed when clearances around the Crest are at least
equal to the SERVICE clearances shown in FIG. 1-1.
For spaces that do NOT supply this clearance, provide
two openings as shown in FIG. 1-1. Each opening must
provide one square inch free area per 1,000 Btu/hr of
boiler input.
2. Combustion air openings are required when using the
Room Air Option on page 27 of this manual.
The Crest in same space with other gas or oil-fired
appliances
1. Follow the National Fuel Gas Code (U.S.) or CSA B149.1
(Canada) to size/verify size of the combustion/ventilation
air openings into the space.
The space must be provided with
combustion/ventilation air openings
correctly sized for all other appliances
located in the same space as the Crest.
Failure to comply with the above warnings
could result in severe personal injury,
death, or substantial property damage.
2. Size openings only on the basis of the other appliances in
the space. No additional air opening free area is needed
for the Crest when it takes its combustion air from
outside (direct vent installation).
Do not install the boiler on carpeting even if
foundation is used. Fire can result, causing
severe personal injury, death, or substantial
property damage.
If flooding is possible, elevate the boiler sufficiently to prevent
water from reaching the boiler.
Flooring and foundation
Flooring
The Crest is approved for installation on combustible flooring,
but must never be installed on carpeting.
Vent and air piping
The Crest requires a special gas vent system, designed for
pressurized venting.
The boiler is to be used for either direct vent installation or
for installation using indoor combustion air. When room air
is considered, see page 27 of this manual. Note prevention of
combustion air contamination below when considering vent/
air termination.
Vent and air must terminate near one another and may be
vented vertically through the roof or out a side wall, unless
otherwise specified. You may use any of the vent/air piping
methods covered in this manual. Do not attempt to install
the Crest using any other means.
Be sure to locate the boiler such that the vent and air piping
can be routed through the building and properly terminated.
The vent/air piping lengths, routing and termination method
must all comply with the methods and limits given in this
manual.
Prevent combustion air contamination
Install air inlet piping for the Crest as described in this
manual. Do not terminate vent/air in locations that can
allow contamination of combustion air. Refer to Table 1A,
page 9 for products and areas which may cause contaminated
combustion air.
Ensure that the combustion air will not
contain any of the contaminants in Table
1A, page 9. Contaminated combustion
air will damage the boiler, resulting in
possible severe personal injury, death
or substantial property damage. Do not
pipe combustion air near a swimming
pool, for example. Also, avoid areas
subject to exhaust fumes from laundry
facilities. These areas will always contain
contaminants.
WARNING
WARNING
WARNING
Assure that the floor and structure is
sufficient to support the installed weight
of the boiler, including the water content
in the heat exchanger. If not, structural
building failure will result, causing severe
personal injury, death, or substantial
property damage.
WARNING
Recommended clearances for service access
- Sides .............................................................................. 24"
- Rear ............................................................................... 24"
- Front ............................................................................. 30"
- Top ................................................................................ 24"
If you do not provide the recommended
service clearances shown, it may not be
possible to service the boiler without
removing it from the space.
NOTICE
Maintain minimum specified clearances for adequate
operation. All installations must allow sufficient space for
servicing the vent connections, water pipe connections, piping
and other auxiliary equipment, as well as the appliance. The
clearance labels on each appliance note the same service and
combustible clearance requirements as shown in this manual.
Multiple boilers may be installed side by side with no clearance
between adjacent boilers because this boiler is approved for
zero clearance from combustible surfaces; however, service
access will be limited from the sides.
Consult the
Venting
section of this manual for specific
installation instructions for the appropriate type of venting
system that you will be using.
