987MB: Installation, Start-up, Operating and Service and Maintenance Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
11
CONDENSATE DRAIN CONNECTION
DO NOT trap the drain line in any other location than at the condensate
drain trap supplied with the furnace. 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.
Special precautions MUST be made if installing furnace in an area
which may drop below 32° F (0° C). This can cause improper operation
or damage to the equipment. If the furnace environment has the potential
of freezing, the drain trap and drain line must be protected. In areas
where the temperature may be below 32° F (0° C), a Condensate Freeze
Protection kit is strongly recommended. Refer to the Accessory section
of the Product Data for current kit number. If the Condensate Freeze
Protection kit is not used, the factory-installed condensate trap must be
adequately covered using a self-regulating, shielded and waterproof heat
tape rated at 3 to 6 watt per foot (10 to 20 watt per meter) at 115 volt,
40°F (4°C).
Failure to effectively secure the heat tape to the trap and
sufficiently cover the trap with heat tape may result in freezing and
cracking of the trap, causing a leak that results in property damage
.
In applications with potential for freezing, the above specified heat tape
must also adequately cover/wrap the remaining condensate drain line to
provide freeze protection. Wrap the drain trap and drain line with the
heat tape and secure with appropriate plastic ties. Follow the heat tape
manufacturer’s recommendations. Prime the trap before furnace
operation.
The condensate drain line must be supported and/or secured per local
codes. Supports and clamps should be spaced to prevent the drain line
from sagging or being dislocated from the furnace or termination point.
In the absence of local codes, consult the current edition of the National
Standard Plumbing Code, in the U.S. or the current edition National
Plumbing Code of Canada in Canada.
A170135
Fig. 11 – Example of Field Drain Attachment
A14532
Fig. 12 – Example of Field Drain Attachment (Not Allowed)
NOTICE
!
The condensate trap extends below the side of the casing in the
horizontal position. A minimum of 2-in. (51 mm) of clearance is
required between the casing side and the furnace platform for the trap to
extend out of the casing in the horizontal position. Allow at least 1/4-in.
per foot (20 mm per meter) of slope down.
The field-supplied, accessory horizontal drain trap grommet is ONLY
REQUIRED FOR DIRECT VENT APPLICATIONS. It it NOT
required for applications using single-pipe or ventilated combustion air
venting.
CAUTION
!
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in burst water pipes and/or
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.
CAUTION
!
FROZEN AND BURST WATER PIPE HAZARD
Failure to protect against the risk of freezing may result in property
damage.
Special precautions MUST be made if installing furnace in an area
which may drop below freezing. This can cause improper operation or
damage to equipment. If furnace environment has the potential of
freezing, the drain trap and drain line must be protected. The use of
accessory drain trap heaters, electric heat tape and/or RV antifreeze is
required for these installations.
-
-
- -
-
-
-
-
- -
-
-
+
+
+
Condensing
Furnace
-
-
- -
-
Evaporator Coil
+ +
+
< +
< +
< +
+
Blower
-
+
= Positive pressure
< +
= Pressure lower than areas with
+
ï
= Negative pressure
Blower creates positive pressure.
Positive pressure extends into coil
condensate drain (no trap).
Furnace condensate does not flow
consistently when drain is at positive
pressure.
+
DIRECT
IO
N
OF
AIRFL
O
W
+
+
+
+
+
+
+
+
+
+
Condensing
Furnace
-
-
- -
-
Evaporator Coil
+
+
+
< +
< +
< +
+
Blower
-
3/4” PVC
1/2
3/4
1/2” CPVC or larger*
+
= Positive pressure
< +
= Pressure lower than areas with
+
ï
= Negative pressure
+
3/4” PVC
DIRECT
IO
N
OF
AIRFL
O
W
+
+
+
+
1/2
3/4
3/4
3/4
Open
standpipe
+
+
3/4
+
+
+
+
Condensing
Furnace
-
-
- -
-
Evaporator Coil
+
+
+
< +
< +
< +
+
Blower
-
3/4” PVC
3/4
1/2” CPVC or larger*
+
= Positive pressure
< +
= Pressure lower than areas with
+
ï
= Negative pressure
+
3/4” PVC
DIRECT
ION
OF
AIRFL
O
W
+
+
+
+
3/4
3/4
3/4
3/4
3/4
+
+
+
+
+
+
+
+
+
+
