Reznor R8HE Unit Installation Manual - Manual (Page 45)

45
recommended for areas where temperatures are below
20 0 F for extended periods of time but is also dependent
on the final depth of the trench if the frost line cannot be
reached. The unit will operate longer and more frequently
during colder weather to help keep the trench from freezing.
IMPORTANT NOTE: The flue condensate of this unit
is slightly acidic and some local codes may require
a neutralizing treatment when disposing directly into
the ground. Check state or local code requirements
for application of this equipment and if necessary
substitute limestone rock, chat, or lime pellets to
the pit to neutralize the condensate instead of using
basic rock or chat.
Preparing the Trench
Start the trench where the 2” vertical pipe can be installed
vertically into the trench and centered under the vent
tee. The horizontal trench should be approximately 8”-
10” wide x 30”-36” long with a minimum depth of 12”-14”
(or deeper) when possible to allow for proper drainage
and minimize chance of freeze up. The trench shoud be
directed away from the unit and home with an approximate
1” / 12” slope. To determine if the length and width for the
trench is suitable, refer to the optional percolation test
section on
page 44 .
Horizontal Drain Pipe Installation
1. After the trench has been dug out, lay in a 3”-4” rock
or chat base the full length of the trench with a slight
slope of 1/4”-1/2”/ per foot. Mix in 50% of the limestone
rock, chat, or lime pellets (if required by code) with the
initial rock base.
2. Clean and cement the field supplied 2” x 90 degree
elbow and 2” x 4” reducer assembly together.
3. Measure and cut a length of 2” PVC that extends vertically
from the bottom of the ¾” drain fitting at the bottom of
the tee to the 2” elbow/reducer assembly resting on the
rock base as shown in
Figure 23 (page 46) .
4. Cut the 3/4” vinyl drain hose and flexible insulation to
the same length as the 2” vertical PVC pipe.
5. Secure the elbow/reducer assembly to one end of the
4” drain pipe.
6. Cut the 4” corrugated flexible drain pipe with drain holes
to a length extending to the end of the trench.
7. Connect vinyl drain tube to the ½” barbed drain
connection at bottom of 2” PVC Tee and secure with
spring hose clamp.
8. Install flexible insulation over the entire length of drain
tube and cut away any excess, then secure at the top
with wire tie provided.
9. Cement the 2” PVC pipe into the elbow/reducer assembly.
10. Work the drain hose assembly into the pipe until the
entire length is inside and the PVC pipe is vertical.
11. Glue or use two 1/2” long screws (field supplied) to
secure the 2” PVC Tee to the unit horizontal vent pipe.
See Joint A in
Figure 23 . NOTE: Fastening the Tee
to the horizontal vent pipe with 1/2” screws will make
disassembly easier for future cleaning or inspection
of the drain / vent system.
12. Prior to backfilling install the 4” flexible pipe filtration
sleeve over the drain pipe or lay the permeable barrier
material down over the length of pipe in the trench.
13. While holding the 2” pipe completely vertical and
centered to the drain tee, slowly backfill the trench
over the full length of the pipe. Use any remaining
rock or chat until the entire length of 4” drain pipe is
covered then use remaining backfill materials from the
excavation area.
14. Continue to backfill the hole until 1”-2” above grade
level and then grade away to keep rain water from
collecting in the trench area as the ground settles over
time. Add any remaining top soil and sod back to pit
location if needed.
Completing the Vent Installation
1. Mark a pencil line up from the centerline of the unit vent
exit hole for aligning and attaching the vent support
bracket.
2. Holding bracket on pencil line at desired height (for
securing to the 10” vent pipe), secure the support bracket
to the unit with two self drilling screws provided in kit.
3. Carefully insert the 1/4” mesh screen into the elbow
and make sure it is firmly in place.
4. Cement the 2” x 90 Degree PVC Elbow (opposite end
with 1/4” mesh screen) and 10” pipe together.
5. Cement or mechanically fasten the assembly (with 1/2”
long screws) into the top of the tee. Verify the outlet is
perpendicular to the unit. See Joint B in
Figure 22 and
Figure 23 .
NOTE: Fastening the 10” pipe to the Tee with 1/2”
screws will make disassembly easier for future cleaning
or inspection of the drain / vent system.
6. Install the 2-1/2” U-Bolt to support bracket using nuts
(provided in kit) to secure the vent assembly to the unit.