Condensate Removal - Whirlpool WAHMS Installation Instructions Manual

The following describes converting to "Horizontal Left-Hand."
Conversion to downflow must be performed in an area that allows
access to all sides prior to placing the air handler in its final location.
Horizontal Left-Hand Conversion
A. DPIH kit
B. Secondary drain
C. Primary drain
1. Remove the 3 air handler access panels.
2. Remove the "J" shaped bracket that retains the evaporator
coil.
3. Remove the flowrator from the lower left side access panel
and slide out the evaporator coil and horizontal drain pan.
4. Remove the gasket from the horizontal pan drain
connections.
5. Remove the oval shaped plastic plug from the left side
access panel.
6. Remove the oval shaped rubber gasket seal from the lower
right side access panel.
7. The drain connections for the horizontal pan are sealed with a
thin coating of plastic. Carefully knock out this plastic seal
with a screwdriver and hammer.
NOTE: The upper drain will become the secondary drain
which is mandatory in many municipalities.
8. Install the plastic plug removed in Step 5 to the right side
lower access panel and the oval shaped rubber gasket to the
lower left access panel.
9. Reinstall the evaporator coil with the horizontal panel on the
left side.
NOTE: Push the assembly completely to the rear to ensure
the engagement of the upflow pan with the rear channel
bracket.
10. Install the "J" bracket removed in Step 2 to support the
upflow pan to the tie channel.
11. Attach all panels and the metering device.

CONDENSATE REMOVAL

The coil drain pan has a primary and an optional secondary drain
with ³⁄₄" NPT female connections. The connectors required can
be ³⁄₄" NPT male either PVC, CPVC or metal pipe and should be
hand tightened to a torque of approximately 37 in.-lbs to prevent
damage to the drain pan connection. An insertion depth between
0.355" (9 mm) to 0.485" (12.3 mm) (3 to 5 turns) should be
expected at this torque. Use the female (³⁄₄ fpt) threaded fitting
that protrudes outside of the enclosure for external connections.
1. Ensure drain pan hole is NOT obstructed.
2. To prevent potential sweating and dripping on to finished
space, it may be necessary to insulate the condensate drain
line located inside the building. Use Armaflex
material.
3. A secondary condensate drain connection has been provided
for areas where the building codes require it. Pitch the drain
line ¹⁄₄" (6.4 mm) per foot to provide free drainage.
4. Insulate the drain lines located inside the building to prevent
sweating.
8
5. Install a condensate trap to ensure proper drainage.
6. If the secondary drain line is required, run the line separately
from the primary drain and end it where it can be easily seen.
NOTE: Water coming from this line means the coil primary drain
is plugged and needs clearing.
If secondary drain is not installed, the secondary access
must be plugged.
The installation must include a "P" style trap that is located as
A B C
close as is practical to the evaporator coil. See the following
illustration for details of a typical condensate line "P" trap.
NOTE: Trapped lines are required by many local codes. In the
absence of any prevailing local codes, please refer to the
requirements listed in the Uniform Mechanical Building Code.
A drain trap in a draw-through application prevents air from being
drawn back through the drain line during fan operation, thus
preventing condensate from draining, and if connected to a
sewer line, to prevent sewer gases from being drawn into the
airstream during blower operation.
Field experience has shown condensate drain traps with an open
vertical Tee between the air handler and the condensate drain trap
can improve condensate drainage in some applications, but may
cause excessive air discharge out of the open Tee. The manufacturer
does not prohibit this type of drain, but the manufacturer also does
not recommend it due to the resulting air leakage.
Regardless of the condensate drain design used, it is the
installer's responsibility to ensure the condensate drain system is
of sufficient design to ensure proper condensate removal from
the coil drain pan.
Condensate Drain Trap
Use of a condensate removal pump is permitted when necessary.
This condensate pump should have provisions for shutting off the
control voltage should a blocked drain occur. A trap must be
installed between the unit and the condensate pump.
IMPORTANT: The evaporator coil is coated with oils that may
dissolve Styrofoam and certain types of plastics. Therefore, a
removal pump or float switch must not contain any of these
materials.
TIP: Priming the "P" trap may avoid improper draining at the
initial installation and at the beginning of the cooling season.
When coils are installed above ceilings, or in other locations
® or similar
where damage from condensate overflow may occur, it is
mandatory to install a field-fabricated auxiliary drain pan under
the coil cabinet enclosure. Drain lines from the auxiliary pan must
be installed and terminated so that the homeowner can see water
discharges.
CAUTION
Goodman 2
B
A
2" (5.1 cm) Minimum
C
A. Cased coil
B. Drain connection
C. Positive liquid seal required at trap
3" (7.6 cm)
Minimum