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Drain
Connection
Air Handler
POSITIVE LIQUID
SEAL REQUIRED
AT TRAP
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 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.
10 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 leak-
age.
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.
10.1 Return Ductwork
DO NOT LOCATE THE RETURN DUCTWORK IN AN
AREA THAT CAN INTRODUCE TOXIC, OR OBJEC-
TIONABLE FUMES/ODORS INTO THE DUCTWORK.
The return ductwork is to be connected to the air han-
dler bottom (upflow configuration).
Do not operate this product without all the ductwork
attached.
2" MIN.
3" MIN.
Figure 12
11 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 should be less than 23 3/4"x20)
filter can be installed on a B, C and D cabinet respectively
(the cabinet size is the seventh letter of the model number).
12 Electric Heat
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 speci-
fication 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.
The heating mode temperature rise is dependent upon the
system airflow, the supply voltage, and the heat kit size (kW)
selected. Use data provided in Tables 2, 3 and 4 to deter-
mine the temperature rise (°F).
NOTE: For installations not indicated above the following
formula is to be used:
TR = (kW x 3412) x (Voltage Correction) x 1.08 / CFM
Where:
TR
= Temperature Rise
kW
= Heater Kit Actual kW
3412 = Btu per kW
VC*
= .96 (230 Supply Volts)
= .92 (220 Supply Volts)
= .87 (208 Supply Volts)
1.08 = Constant
CFM = Measured Airflow
*VC (Voltage Correction)
NOTE: The Temperature Rise Tables can also be used to
estimate the air handler airflow delivery. When using these
tables for this purpose set the room thermostat to maximum
heat and allow the system to reach steady state conditions.
Insert two thermometers, one in the return air and one in the
supply air. The temperature rise is the supply air temperature
minus the room air temperature. Using the temperature rise
calculated, CFM can be estimated from the TR formula above.
See Technical Manual and/or Service Manual for more
information.
12.1 No Electric Heat Installed
If no electric heat accessory kit is installed, a cover plate
must be installed over the opening for electric heat. This
cover plate kit is available from Goodman
brand distributors.
9
®
®
and Amana
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