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268890-UIM-B-0607
22 Unitary Products Group
Specially Engineered Installations
The above requirements shall be permitted to be waived where special
engineering, approved by the authority having jurisdiction, provides an
adequate supply of air for combustion, ventilation and dilution of flue
gases.
SECTION VIII: CONDENSATE PIPING
CONDENSATE DRAIN
The condensate drain connection is provided in the furnace for field
installation. It consists of the hoses shown below, a NPT male connec-
tion, and a 1/2” (1.27 cm) female x 3/4” (1.9 cm) PVC slip coupling.
Some of the drain hoses will be needed to convert the condensate drain
system when the furnace is installed in a horizontal left or right configu-
ration. Refer to Figures 30 - 36 for the condensate hose sizes for con-
densate drain connections.
IMPORTANT: The condensate drain from the furnace may be con-
nected in common with the drain from an air conditioning coil if allowed
by local code.
IMPORTANT: Condensate must be disposed of properly. Follow local
plumbing or wastewater codes. The drain line must maintain a 1/4" per
foot (0.635 cm per meter) slope to the drain.
CONDENSATE DRAIN TRAP AND DRAIN 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 furnace is installed in an area that has
the potential of freezing, the drain line and the drain trap must be pro-
tected. Use a 3 to 6 watt per foot at 115 vac, 40º F (4.4° C) self-regulat-
ing, shielded and waterproof heat tape. Wrap the drain trap and the
drain line with the heat tape and secure with ties. Follow the heat tape
manufacturer's recommendations.
CONDENSATE DRAIN HOSE PART NUMBERS
DOWNFLOW/HORIZONTAL CONDENSATE
INTERNAL DRAIN CONFIGURATIONS
Downflow - Refer to Figure 30
Furnace is shipped with one end of condensate hose #2 left open in the
furnace. If the provided Wye's drain is aligned with the opening in the
top of the furnace, hose #2 can be used. If it is desired that the Wye and
street elbow assembly point away from the opening in the casing top,
then the #2 hose will have to be replaced with provided #9 hose. The
dogleg end of hose #9 hose should be installed on the drain of the Wye.
FIGURE 28: Attic Combustion Air Termination
Be sure to instruct the owner not to block this intake pipe.
FIGURE 29: Condensate Drain Internal Hose Routing
12” MINIMUM BETWEEN
BOTTOM OF BELOW AND
ANY MATERIAL
12”
MIN.
CONDENSATE DRAIN TUBE 5/8” (1.59 cm)
TABLE 15:
Condensate Drain Hose
Part
Number
Hose
Numb
er
Description
028-15156-000 #1 Drain tube - Condensate pan (Down flow)
028-15176-000 #2 Drain tube - Inducer (Horizontal RT.)
-Vent system Down flow)
028-15168-000 #3 Drain tube - Inducer (Down flow)
028-15176-000 #4 Drain tube - Rain gutter (Down flow & Horizontal RT.)
028-15176-000 #5 Drain tube - After Tee (Down flow)
028-15196-000 #6 Drain tube – Upper rain gutter (Horizontal LT.)
028-15169-001 #7 Drain tube - After Tee (Horizontal RT.)
028-13309-004 #8 Drain tube - P-trap (All models)
028-15158-000 #9 Drain tube - Vent system (Horizontal LT.)
- Before Tee (Horizontal RT.)
028-15197-000 #10
Drain tube – Condensate pan (Horizontal –
drain closer to the front of the furnace, both LT & RT)
Hoses #2, #4, #5, along with a barbed nipple, and a barbed tee are part of
condensate hose assembly 028-15176-000.