035-20646-001 Rev. A (1004)
20
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
SECTION IX: 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 32, 33 & 34 for the condensate hose sizes for
condensate 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. Some supplied hoses may
have to be trimmed to maintain downward slope.
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 (0.003 to 0.006 kW per meter) at 115
vac, 40º F (4.4° C) self-regulating, 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
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.
Be sure to instruct the owner not to block this intake pipe.
FIGURE 31:
Condensate Drain Internal Hose Routing
CONDENSATE DRAIN TUBE 5/8” (1.59 cm)
TABLE 14:
Condensate Drain Hose
Part
Number
Hose
Number
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.
FIGURE 32:
Downflow Condensate Drain Hose Configuration
HOSE #2 (if drain aligned
above the hole in
furnace top)
HOSE #4 (with 3/8”
barbed nipple)
HOSE #5
HOSE #1
HOSE #3
3/8” BARBED TEE
1”
SPRING CLAMP
1”
2-3/4”
22-1/8”
HOSE #8*
DOG-LEG
SPRING CLAMP
3/4”
17-1/2”
3/8”
HOSE #2
DOG-LEG
1”
2-3/4”
8-1/8”
HOSE #1
DOGLEG
HOSE #3
1-1/8”
5/8”
3-3/8”
SPRING CLAMP
SPRING CLAMP
9”
3/4”
3/4”
HOSE #5
SPRING CLAMP
3/4”
2”
1/2”
HOSE #4
SPRING CLAMP
-
HOSE #9
3/4”
33”
3/4”
1-5/8”
*USED AFTER
CONDENSATE
TRAP
