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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 FUMES/
ODORS INTO THE 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.
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 3, 4 and 5 to determine the temperature
rise (°F).
CFM
3
5
8 0 0
1 2
1 9
1 0 0 0
9
1 5
1 2 0 0
8
1 2
1 4 0 0
7
1 1
1 6 0 0
6
9
1 8 0 0
5
8
2 0 0 0
5
7
230/1/60 SUPPLY VOLTAGE - TEMP. RISE °F
C FM
3
5
8 0 0
1 1
1 8
1 0 0 0
9
1 4
1 2 0 0
7
1 2
1 4 0 0
6
1 0
1 6 0 0
6
9
1 8 0 0
5
8
2 0 0 0
4
7
220/1/60 SUPPLY VOLTAGE - TEMP. RISE °F
CFM
3
5
8 0 0
1 0
1 7
1 0 0 0
8
1 3
1 2 0 0
7
1 1
1 4 0 0
6
1 0
1 6 0 0
5
8
1 8 0 0
5
7
2 0 0 0
4
7
208/1/60 SUPPLY VOLTAGE - TEMP. RISE °F
Model
3
5
AVPTC25B14
550
650
AVPTC29B14
550
650
AVPTC35B14
550
650
AVPTC37B14
550
650
AVPTC31C14
600
700
AVPTC33C14
600
700
AVPTC37C14
700
AVPTC39C14
700
AVPTC49C14
800
AVPTC59C14
800
AVPTC37D14
870
AVPTC49D14
950
AVPTC59D14
990
AVPTC61D14
1030
MINIMUM CFM REQUIREMENTS FOR HEATER KITS
NOTE: For installations not indicated above the following formula
is to be used:
TR = (kW x 3412) x (Voltage Correction) / (1.08 x 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)
9
H EAT KIT NO M IN AL k W
6
8
1 0
1 5
2 3
3 1
3 7
5 6
1 9
2 5
3 0
4 4
1 5
2 1
2 5
3 7
1 3
1 8
2 1
3 2
1 2
1 5
1 9
2 8
1 0
1 4
1 6
2 5
9
1 2
1 5
2 2
Table 3
H EA T K IT N O M IN A L k W
6
8
1 0
1 5
2 2
3 0
3 5
5 4
1 8
2 4
2 8
4 2
1 5
2 0
2 4
3 5
1 3
1 7
2 0
3 0
1 1
1 5
1 8
2 7
1 0
1 3
1 6
2 4
9
1 2
1 4
2 1
Table 4
HEAT KIT NO M INAL k W
6
8
1 0
1 5
2 1
2 8
3 3
1 7
2 2
2 7
4 0
1 4
1 9
2 2
3 3
1 2
1 6
1 9
2 9
1 0
1 4
1 7
2 5
9
1 2
1 5
2 2
8
1 1
1 3
2 0
Table 5
HEATER (kW)
6
8
10
15
19
700
800
850
875
700
800
875
875
700
800
875
1050
700
800
875
1050
770
880
970
1090
1280
750
850
920
950
770
880
970
1090
1280
770
880
970
1090
1280
800
950
1090
1290
1345
800
950
1090
1290
1345
970
1060
1120
1220
1060
1150
1220
1520
1110
1200
1240
1520
1150
1250
1320
1650
Table 6
1 9 /2 0
2 5
4 9
6 2
4 2
5 3
3 7
4 6
3 3
4 1
3 0
3 7
1 9 /2 0
2 5
4 7
5 9
4 0
5 1
3 5
4 4
3 1
3 9
2 8
3 5
1 9 /2 0
2 5
4 5
5 6
3 8
4 8
3 3
4 2
3 0
3 7
2 7
3 3
20
25
1250
1520
1690
1750
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