Rheem Raypak Delta Limited 399B, Installation And Operation Manual

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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 in. (mm)
Recommended
Service
Clearance in. (mm)
Floor* 0 (0) 0 (0)
Rear 1(25) 6 (152)
Water Side 12 (305) 24 (610)
Other Side 1(25) 24 (610)
Top 1(25) 6 (152)
Front Open 24 (610)
Vent 2 (51) 2 (51)
Table E: Clearances – Indoor Installations
TOP VIEW
12" (30.5 cm) 1" (2.5 cm)
1"
(2.5 cm)
1"
(2.5 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
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.
Heater
Side
Minimum Clearance
from Combustible
Surfaces in. (mm)
Recommended
Service
Clearance in. (mm)
Floor Open 24 (610)
Rear 12 (308) 6 (152)
Water Side 36 (914) 36 (914)
Other Side
36 (914) 36 (914)
Top 36 (914)
Vent N/A N/A
Unobstructed
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.