11
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.
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.
9.1 Return Ductwork
DO NOT LOCATE THE RETURN DUCTWORK IN
AN AREA THAT CAN INTRODUCE TOXIC, OR
OBJECTIONABLE FUMES/ODORS INTO THE
DUCTWORK.
The return ductwork is to be connected to
the air handler bottom (upflow configuration).
10 Return Air Filters
NOTE: For AMST24BU1400** only: If installing a filter,
an external filter must be used when installing the
unit in Horizontal Right, or if the side drain pan is not
removed for Down Flow application. A filter will not fit
on the internal filter rails in these applications.
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 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
and HKTSD series. Refer to the air handler unit’s Serial
and Rating plate or the HKS and HKTSD specification
sheets to determine the heat kits compatible with a given
air handler. No other accessory heat kit besides the HKS
and HKTSD 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 5, 6, AND 7 to
determine the temperature rise (°F).
NOTE: For installations not indicated above the
following formula is to be used:
TR = (kW x 3412) x (Voltage Correction) / (1.08XCFM)
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 Service Manual for
more information.
3
5
6
8
10
15 19/20 25
800
12
19
23
31
37
1000
9
15
19
25
30
44
1200
8
12
15
21
25
37
49
62
1400
7
11
13
18
21
32
42
53
1600
6
9
12
15
19
28
37
46
1800
5
8
10
14
16
25
33
41
2000
5
7
9
12
15
22
30
37
CFM
HEAT KIT NOMINAL kW
230/1/60 SUPPLY VOLTAGE - TEMP. RISE °F
Table 7
Содержание AMST U1400 Series
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