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Raypak 399B-2339B Operations Instructions Page 11

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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.).
Clearances
Indoor Installations
Heater
Side
Minimum Clearance
from Combustible
Surfaces
Recommended
Service
Clearance
Floor* 0” 0”
Rear 1” 24”
Water Side 12” 24”
Other Side 1” 24”
Top 1” 1”
Front Open 24”
Vent 2” 2”
Table E: Clearances – Indoor Installations
TOP VIEW
FRONT VIEW
Venting not shown for clarity. Heater must be vented
per instructions in this manual
Fig. 7: Minimum Clearances from Combustible
Surfaces – 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, we recommend a clearance of at
least 24 in. in front, and at least 12 in. on the water
connection side. This will allow the heater to be serv-
iced in its installed location without movement or
removal of the heater.
Service clearances less than the minimums may
require removal of the heater to service either the heat
exchanger or the burner tray. In either case, the heater
must be installed in a manner that will enable the
heater to be serviced without removing any structure
around the heater.
Outdoor Installations
These heaters are design-certified for outdoor installa-
tion. Heaters must not be installed under an overhang
that is less than 3 ft from the top of the heater. Three
sides must be open in the area under the overhang.
Roof water drainage must be diverted away from
heaters installed under overhangs.
Heater
Side
Min. Clearance
from Combustible
Surfaces
Recommended
Service
Clearance
Front Open 24”
Rear 12” 24”
Water Side 36” 36”
Other Side 36” 36”
Top Unobstructed 36”
Vent N/A N/A
Table F: Clearances – Outdoor Installations
These clearances are required when the outdoor
vent cap is used. If installing the heater outdoors
with a vent stack, the indoor clearances may be
utilized.
The combustion air intake hood MUST be used for
outdoor installations. The hood is shipped loose and
installed on the side of the heater over the filter box at
the jobsite.
* DO NOT install on carpeting.
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