Clearances - Rheem Raypa DELTA 399B Installation And Operation Manual

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
Minimum Clearance
Heater
from Combustible
Side
Surfaces in. (mm)
Floor* 0 (0)
Rear 1(25)
Water Side 12 (305)
Other Side 1(25)
Top 1(25)
Front Open
Vent 2 (51)
* DO NOT install on carpeting.
Table E: Clearances – Indoor Installations
12" (30.5 cm)
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
Recommended
Service
Clearance in. (mm)
0 (0)
6 (152)
24 (610)
24 (610)
6 (152)
24 (610)
2 (51)
1" (2.5 cm)
(2.5 cm)
TOP VIEW
(2.5 cm)
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 con-
nection side. This will allow the heater to be serviced
in its installed location without movement or removal
of the heater.
Service clearances less than the minimums may re-
quire removal of the heater to service either the heat
exchanger or the burner tray. In either case, the heat-
er 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 heat-
ers installed under overhangs.
Minimum Clearance
Heater
from Combustible
Side
Surfaces in. (mm)
Floor
Rear
Water Side
Other Side
1"
Top
Vent
Table F: Clearances – Outdoor Installations
These clearances are required when the outdoor
1"
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.
Recommended
Service
Clearance in. (mm)
Open
12 (308) 6 (152)
36 (914)
36 (914) 36 (914)
Unobstructed
N/A
24 (610)
36 (914)
36 (914)
N/A
11