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Condensate Drain Trap
This
furnace
removes
both
sensible
and latent heat
from
the
products
of combustion.
Removal
of the latent heat results in
condensation of the water vapor. The condensate is removed from
the furnace through the drains in the plastic transition and the
vent
fitting.
The
drains
connect
to
the
externally
mounted
condensate drain trap on the left or right side of the furnace.
The start-up of a new furnace will involve a cycle or two of the
furnace to properly prime the condensate trap with water. Until
the trap is fully primed, some condensate will be pulled into the
combustion blower. The furnace may cycle on the pressure switch
connected to the plastic transition box due to condensate buildup.
After the trap is primed, the condensate will start draining from
the furnace. The combustion blower will clear out any remaining
condensate
in
the
blower
housing
through
the
vent
fitting
downstream of the blower. Note that the condensate trap can also
be primed by pouring water into the !/>" drain hose. Remove
thet/>" ID drain hose from either the gutter or the white PVC
tee
trap. Using a funnel pour eight (8) ounces of water into !/5"(13
mm) ID drain hose. Water will flow through the drain hose and
into the condensate drain trap. This will prime both the vent and
the
transition
sides
of the
trap.
Reconnect
the
"(13
mm)
ID
drain hose to the original component, either the gutter or the PVC
tee trap.
The condensate drain trap supplied with the furnace MUST
be
used. The drain connection on the condensate drain trap is sized
for
3/4"
PVC
or
CPVC
pipe,
however
alternate
1h"(13
mm)
CPVC (nominal °/g" O.D.) or vinyl tubing with a minimum inner
diameter (I.D.) of °/g" may
also be used, as allowed by local
codes. Alternate drain pipes and hoses may be used as allowed by
local codes.
The
drain line must
maintain
a 174" (6 mm)
per foot downward
slope toward the drain.
!/," (6 mm)
per foot is recommended.
Installation of an overflow line is recommended
when the 174" (6
mm) per foot slope to the condensate drain cannot be maintained.
A
drain
tube
clip
is
included
in
the
furnace
to
prevent
kinking/buckling of the drain tube. The clip should remain in the
furnace (between the door switch plate and the blower shelf, Fig.
9)
during
operation.
See
Fig.
19
for
proper
routing
and
installation of the overflow.
DO
NOT
trap the drain line in any other location than at the
condensate drain trap supplied with the furnace.
FROZEN AND BURST WATER PIPE HAZARD
Failure to follow this caution may result in property damage.
If a condensate pump is installed, a plugged condensate drain
or a failed pump may cause the furnace to shut down.
Do
not
leave
the
home
unattended
during
freezing
weather
without turning off water supply and draining water pipes or
otherwise protecting against the risk of frozen pipes.
If possible, DO
NOT
route the drain line where it may freeze.
The
drain
line must
terminate
at an inside
drain
to prevent
freezing of the condensate and possible property damage.
1. A condensate sump pump MUST
be used if required by
local codes, or if no indoor floor drain is available. The
condensate
pump
must be approved
for use with acidic
condensate.
2. A plugged condensate
drain line or a failed condensate
pump will allow condensate to spill. If the furnace is in-
stalled where a condensate spill could cause damage, it is
recommended that an auxiliary safety switch be installed
to prevent operation of the equipment in the event of pump
failure or plugged drain line. If used, an auxiliary safety
switch should be installed in the R circuit (low voltage)
ONLY.
3. If the auxiliary switch in the condensate pump is used, the
furnace may shut down due to a blocked condensate line
or failed pump.
To prevent
frozen water pipes
see the
"Frozen Water Pipe Hazard"
Installation Section of this
manual.
Representative drawing only, some models may vary in appearance.
A07705
Fig. 9 - Drain Tube Clip Location
Condensate Drain Trap Freeze Protection
Special precautions MUST
be made if installing furnace in an
area Which may drop below freezing. This can cause improper
operation
or
damage
to
the
equipment.
If the
the
furnace
environment has the potential of freezing, the drain trap and drain
line must be protected. Use 3 to 6 watt per foot at 115 volt, 40° F
(4° C) self-regulating shielded and waterproof heat tape. Wrap
the drain trap and drain line with the heat tape and secure with the
ties. Follow the heat tape manufacturer's recommendations.
17
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