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NOTE: Water coming from secondary line means the coil
primary drain is plugged and needs immediate attention.
If secondary drain is not installed, the secondary access
must be plugged.
Insulate drain lines located inside the building or above
a finished 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 11
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 11 to allow proper drainage and prevent
condensate overflow.
Connection
Air Handler
POSITIVE LIQUID
SEAL REQUIRED
AT 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.
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 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.
CAUTION
Drain
2" MIN.
2.75" MIN.
Figure 11
9 Ductwork
This air handler is designed for a complete supply and return
ductwork system.
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.
9.1 Return Ductwork
DO NOT LOCATE THE RETURN DUCTWORK IN
AN AREA THAT CAN INTRODUCE TOXIC, OR
OBJECTIONABLE
DUCTWORK. The return ductwork is to be connected
to the air handler bottom (upflow configuration).
10 Return Air Filters
Each installation must include a return air filter. This filtering
may be performed at the air handler using the factory filter
rails or externally such as a return air filter grille. When
using the factory filter rails, a nominal 16x20x1", 20x20x1"
or 24x20x1" (actual dimension must be less than 23-½"x20")
filter can be installed on a B, C and D cabinet respectively
(the cabinet size is the seventh letter of the model number).
11 Achieving 1.4% and 2.0% Airflow Low
Leakage Rate
Ensure all the gaskets remain intact on all surfaces as
shipped with the unit. These surfaces are areas between
the upper tie plate and coil access panel, blower access
and coil access panels, and between the coil access and
filter access panels. Ensure upon installation, that the plastic
breaker cover is sitting flush on the blower access panel and
all access panels are flush with each other and the cabinet.
With these requirements satisfied, the unit achieves less
than 1.4% airflow leakage @ 0.5 inch wc static pressure
and less than 2% airflow leakage @1inch wc static pressure
when tested in accordance with ASHRAE Standard 193.
12 Electric Heat
Do not operate this product without all the ductwork
attached.
Refer to the installation manual provided with the electric
heat kit for the correct installation procedure. All electric heat
must be field installed. If installing this option, the ONLY heat
kits that are permitted to be used are the HKS series. Refer
to the air handler unit's Serial and Rating plate or the HKS
specification sheets to determine the heat kits compatible
with a given air handler. No other accessory heat kit besides
the HKS series may be installed in these air handlers.
10
FUMES/ODORS
INTO
CAUTION
THE
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