Rheem GF901U Series Installation Instructions Manual page 40

Clamp the hose tight with white
nylon clamp. Then attach the long
end of the molded hose to the 45°
elbow molded into the top of the
trap assembly. Clamp the hose
tight with white nylon clamp.
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.
4
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.
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.