Rheem Raypak Hi Delta P902C Installation & Operating Instructions Manual page 39

approved condensate trap must be installed per
applicable codes.
2. The intake vent must be insulated through the
length of the horizontal run.
Units with ducted combustion air DO NOT meet the
requirements for direct venting, unless they are
equipped with internal ducting to fully isolate the com-
bustion system from room air. The internal ducting is
the TruSeal option (Sales order option, D-21 if facto-
®
ry-installed or D-22 if field-installed).
Termination
The flue direct vent cap MUST be mounted on the ex-
terior of the building. The direct vent cap cannot be
installed in a well or below grade. The direct vent cap
must be installed at least 1 ft above ground level and
above normal snow levels.
The direct vent cap MUST NOT be installed with any
combustion air inlet directly above a direct vent cap.
This vertical spacing would allow the flue products
from the direct vent cap to be pulled into the combus-
tion air intake installed above.
This type of installation can cause non-warrantable
problems with components and poor operation of the
heater due to the recirculation of flue products. Multi-
ple direct vent caps should be installed in the same
horizontal plane with a 4 ft clearance from the side of
one vent cap to the side of the adjacent vent cap(s).
VENT CAPS STACKED VERTICALLY
FLUE GASES MOVING IN PARALLEL
4'-0" MIN.
(TYP)
DISCHARGE
VENT CAPS ALL AT SAME ELEVATION
FLUE GASES MOVING TOWARD EACH OTHER
2" MINIMUM (TYP)
DISCHARGE
4'-0" MIN.
(TYP)
VENT CAPS AT STAGGERED ELEVATIONS
FLUE GASES MOVING TOWARD EACH OTHER
Fig. 42: Vent Cap Configurations
1" MINIMUM (TYP)
1" MINIMUM (TYP)
Combustion air supplied from outdoors must be free of
particulate and chemical contaminants. To avoid a
blocked flue condition, keep the vent cap clear of
snow, ice, leaves, debris, etc.
WARNING: No substitutions of flue pipe or vent
cap material are allowed. Such substitutions would
jeopardize the safety and health of inhabitants.
The stainless steel flue direct vent cap MUST be fur-
nished by the heater manufacturer in accordance with
its listing (sales order option D-15).
Use only the special gas vent pipes listed for use with
Category III gas burning heaters, such as the stainless
steel vents offered by Heat Fab Inc. (800-772-0739),
Protech System, Inc. (800-766-3473), Z-Flex (800-
654-5600) or
(800-423-4270). Pipe joints must be positively sealed.
Follow carefully the vent manufacturer's installation
instructions.
CAUTION: Condensate is acidic and highly
corrosive.
Note: When vertical height exceeds 25 ft, consult
factory prior to installation.
Fig. 43: Ducted Air - Vertical
Ducted Air - Vertical
Installation
These installations utilize the heater-mounted blower
to draw combustion air from outdoors and force the
heated flue products through the vent pipe under posi-
tive pressure. The vent material must be in
accordance with the above instructions for vent mate-
rials. Vent material must be listed by a nationally
recognized test agency.
39
American Metal Products