Installation manual

035-19599-001 Rev. A (1103)
Unitary Products Group 19
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
The condensate drain connection is provided in the furnace for field
installation. It consists of a formed hose with a 1/2” (12.7 mm) NPT
male connection. A 1/2” (12.7 mm) FM x 3/4” (19 mm) PVC slip cou-
pling is provided.
This drain hose may be installed to allow left or right side condensate
drain connection, refer to Figure 29. Cut the hose to allow for proper fit
for left or right exit.
To install the drain hose assembly, remove the 7/8” (22 mm) knockout in
the side panel. Remove the conduit nut from the 1/2” (12.7 mm) male
fitting. Push the male fitting through the hole and reinstall the nut. The
use of the 3/4” (19 mm) PVC coupling is optional.
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
The condensate trap must be filled with water before putting the furnace
into operation. Perform the following procedures only after the conden-
sate trap has been properly piped to a drain connection using the pro-
cedure in this instruction.
The recommended procedure is as follows:
1. Disconnect the condensate drain hose from the induced draft
blower discharge.
2. Elevate this hose and fill with water using a funnel.
3. Replace the condensate drain hose and clamps.
If this procedure is not followed, the unit may not properly drain on initial
start up.
CONDENSATE DRAIN TERMINATION
DO NOT terminate condensate drain in a chimney, or where the drain
line may freeze. The line must terminate at an inside drain to prevent
freezing of the condensate and possible property damage.
DO NOT trap the drain line at any other location than at the condensate
drain trap supplied with the furnace.
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.
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 self-regulating, shielded and waterproof heat tape. Wrap the
drain trap and the drain line with the heat tape and secure with ties. Fol-
low the heat tape manufacturer's recommendations.
CONVERSION FOR HORIZONTAL APPLICATIONS
Remove the condensate trap and its mounting bracket from the unit
side panel. Remove all drain hoses. Reinstall the trap/bracket on the
side panel, which will be on the bottom when the unit is located horizon-
tally. Use the original mounting screws. Refer to Figure 30 for hose
locations and Table 7 for hose cut lengths. All hoses are identified as
shown in Figure 30.
For horizontal left airflow (inducer and vent low) or horizontal right air-
flow (inducer and vent high), install condensate drain hoses as follows:
RIGHT AIRFLOW (Inducer High) - Three hoses are required. Hoses are
supplied with furnace.
LEFT AIRFLOW (Inducer Low) - Two hoses are required. Inducer outlet
to trap is supplied. Condensate pan to trap must be field supplied using
5/8” (15.875 mm) I.D. hose material.
FIGURE 26: Attic Combustion Air Termination
Be sure to instruct the owner not to block this intake pipe.
FIGURE 27: Condensate Piping
12” MINIMUM BETWEEN
BOTTOM OF BELOW AND
ANY MATERIAL
12”
MIN.
CONDENSATE
TRAP TUBING
TABLE 13: Horizontal Condensate Drain Hose Sizes
DIMENSIONS
CABINET SIZE
Inches cm Inches cm Inches cm Inches cm
14-1/2 36.8 17-1/2 44.4 21 53.3 24-1/2 62.2
RIGHT AIRFLOW (INDUCER HIGH)
A 4 - 1/2 11.4 4 - 3/4 12.0 3 - 1/2 8.8 5 - 1/4 13.3
B 7 - 1/2 19.0 10 - 1/2 26.6 14 35.5 17 - 1/2 44.4
C 13 - 1/2 34.2 16 - 1/2 41.9 20 508 23 - 1/2 59.6
LEFT AIRFLOW (INDUCER LOW)
D 3 - 3/8 8.5 3 - 1/4 8.2 3 - 1/4 8.2 3 - 1/4 8.2