10
8 Condensate Drain Lines
The coil drain pan has a primary and a secondary drain with
3/4” NPT female connections. The connectors required are
3/4” NPT male, either PVC or metal pipe, and should be
hand tightened to a torque of no more than 37 in-lbs. to pre-
vent damage to the drain pan connection. An insertion depth
of approximately 3/8” to 1/2” (3-5 turns) should be expected
at this torque.
1. Ensure drain pan hole is not obstructed.
2.
To prevent potential sweating and dripping on to fin
-
ished space, it may be necessary to insulate the con-
densate drain line located inside the building. Use Ar-
maflex® or similar material.
A secondary condensate drain connection has been provid-
ed for areas where the building codes require it. Pitch all
drain lines a minimum of 1/4” per foot to provide free drain-
age. Provide required support to the drain line to prevent
bowing.
If the secondary drain line is required, run the line sepa-
rately from the primary drain and end it where condensate
discharge can be easily seen.
NOTE:
Water coming from secondary line means the coil
primary drain is plugged and needs immediate attention.
CAUTION
IF SECONDARY DRAIN IS NOT INSTALLED, THE SECONDARY
ACCESS MUST BE PLUGGED.
Insulate drain lines located inside the building or above a fin
-
ished living space to prevent sweating. Install a condensate
trap to ensure proper drainage.
NOTE:
When units are installed above ceilings, or in other
locations where damage from condensate overflow may oc
-
cur, it is MANDATORY to install a field fabricated auxiliary
drain pan under the coil cabinet enclosure.
The installation must include a “P” style trap that is located
as close as is practical to the evaporator coil. See Figure 12
for details of a typical condensate line “P” trap.
NOTE:
Units operating in high static pressure applications
may require a deeper field constructed “P” style trap than
is shown in Figure 12 to allow proper drainage and prevent
condensate overflow.
Air Handler
3" MIN.
POSITIVE LIQUID
SEAL REQUIRED
AT TRAP
Drain
Connection
2" MIN.
Figure 12
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.
Use of a condensate removal pump is permitted when nec-
essary. 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 conden-
sate pump.
IMPORTANT NOTE:
The evaporator coil is fabricated with
oils that may dissolve styrofoam and certain types of plas-
tics. Therefore, a removal pump or float switch must not con
-
tain 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.
9 Ductwork
This air handler is designed for a complete supply and return
ductwork system.
CAUTION
DO NOT OPERATE THIS PRODUCT WITHOUT ALL THE
DUCTWORK ATTACHED.
To ensure correct system performance, the ductwork is to
be sized to accommodate 350-450 CFM per ton of cooling
with the static pressure not to exceed 0.5” in w.c. Refer to
ACCA Manual D, Manual S and Manual RS for information
on duct sizing and application. Flame retardant ductwork
is to be used and sealed to the unit in a manner that will
prevent leakage.
NOTE:
A downflow application with electric heat must have
an L-shaped sheet metal supply duct without any outlets or
registers located directly below the heater.
