1083293-UIM-D-1116
20
Johnson Controls Unitary Products
The condensate will flow to the drain better if an open stand pipe is
installed in the drain line. See Figure 24.
If evaporator coil or humidifier drains are combined with the furnace
drain, then the open stand pipe could be raised higher, above the 5”
minimum.
Do not drain other devices (humidifier, evaporator coil, etc.) into the top
opening of the vent stand pipe. Instead, install a second tee in the
vented drain tube below the furnace drain tee and route additional
drainage through the new tee.
CONDENSATE DRAIN TERMINATION
A condensate sump pump MUST be used if required by local codes, or
if no indoor floor drain is available. The condensate sump pump must
be approved for use with acidic condensate.
FIGURE 24:
Typical. Condensate Drain, Vertical Installation
NOTICE
A loop has been added to the pressure switch vacuum hose. How-
ever, ensure that all pressure switch hoses are routed such that they
prevent any condensate from entering the pressure switch.
To Open Or
Vented Drain
Tee
5” Min.
Open Stand Pipe
(Anti-siphon air vent)
CAUTION
It is possible for condensation to form inside the combustion air
(intake) pipe in the summer months if significant length of combustion
air pipe passes through conditioned space. This problem can be
averted by installing the supplied vent drain and drain hose located in
the loose parts bag. The intake drain hose is to be installed by con-
necting it to the inlet pipe coupling and to the collector box as shown
in Figure 25., 27, and 28. The drain hose must not sag or droop after
it is installed. If glue is used when connecting the intake pipe to the
intake coupling, the drain opening in the vent drain must not be
plugged. If the intake drain is used, the bird screen cannot be
installed. This is only approved for upflow and horizontal applications
when the intake pipe is located on the top of the furnace. This is true
for all long horizontal venting in any furnace configuration. This will
keep condensate from entering the furnace.
WARNING
DO NOT terminate the condensate drain in a chimney, or where the
drain line may freeze. If the drain line will be exposed to temperatures
below freezing, adequate measures must be taken to prevent the
drain line from freezing. Failure to provide proper protection from
freezing can result in improper operation or damage to the equipment
and possible property damage. When exposed to temperatures
below freezing, use of a 3 to 6 watt per foot at 115 VAC, 40°F (4.4°C)
self-regulating, shielded and waterproof heat tape is recommended
on the drain line outside the furnace.
DO NOT trap the drain line at any location. The furnace has a con-
densate drain trap built into the drain pan.
WARNING
Liquid anti-freeze will cause damage to internal plastic parts of this
furnace. DO NOT attempt to winterize the furnace using liquid
anti-freeze.
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