Rheem 90RS04EES Series Installation Instructions Manual page 39

molded into the top of the trap
assembly. Clamp the hose tight
with black nylon clamp. The
horizontal ribbed tube is 6.7 in
length.
NOTE: Use the horizontal ribbed
tube in all horizontal application
L
except for the 07B. This model has
a longer distance between the
collector and horizontal drain trap.
Use the ribbed tube for
C
horizontal application on the 07B
models only.
IMPORTANT: Tighten all clamp
connections with a pair of pliers
and check for leaks after
conversion is complete.
11. IMPORTANT: There are two
options when choosing a height for
the condensate riser:
CONDENSATE OVERFLOW: With
3
a 1 ⁄ inch riser installed above the
4
tee, a blocked drain will result in
overflow from the riser.
FURNACE SHUTDOWN: To
cause the furnace to shut down
when a blocked drain is present,
install a riser which is a minimum
1
of 5 ⁄ ". If the furnace is installed in
2
an attic, crawlspace or other area
where freezing temperatures may
occur, the furnace drain can freeze
while shut off for long periods of
time. Provisions must be made to
prevent freezing of condensate
(see Figure 2).
Use a solvent cement that is
compatible with PVC material.
NOTE: See location requirements and
combustion section for additional
recommendations.
FILLING THE TRAP
FILL THE TRAP ASSEMBLY WITH
WATER BEFORE OPERATING THE
FURNACE. Do this by removing the
drain hose from the trap or from the
connection to the secondary coil.
Pour about a cup of water into the
vent trap. Any excess water flows into
the house drain when the trap is full.
NOTE: Fill the trap assembly with
water every heating season.
DOWNFLOW UNITS
To convert to left side drainage, first
remove the drainage hoses from the
trap. Remove the trap from its
mounting bracket, rotate it 180°, and
mount in place with the drainage
elbow pointing to the left. Reattach
the drain hoses. Remove the plastic
drainage knockout from the left side.
See Figure 31.
IMPORTANT: When changing to the
left side, interchange the rubber
bushing on the right side with the hole
plug on the left side. The hole plug
must be in place to assure that the
control compartment is sealed.
1
A length of / -in. PVC pipe is
2
provided for left hand drainage. Glue
one end of the pipe to the elbow in
the trap. Cut the pipe so that it
extends through the left cabinet side
1
one inch. Connect the / -in. tee to the
2
pipe with a riser and drain tube as
listed above. Use the plastic plug
from the left side drainage knockout
to seal the right side drainage
knockout.
IMPORTANT: Do not connect into
a common drain line with an air
conditioner evaporator coil drain. A
blocked or restricted drain line can
result in overflow of the coil pan and
negate the furnace blocked drain
shutoff control.
39