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IX. MAKE AIRFLOW SELECTIONS
A. Airflow Selection for 333(B,J)AV Furnaces
The 333(B,J)AV Non-Condensing Variable-Speed Furnaces pro-
vide high- and low-speed blower operation to match the capacities
of compressor high and low speeds. To select recommended
airflow, refer to Table 3 and the 333(B,J)AV Installation Instruc-
tions. These settings are made on the furnace airflow selector
board by moving the appropriate color-coded jumper wires. The
ORANGE jumper wire should be set to the AC position for
cooling only. The YELLOW COOL SIZE jumper is used to select
airflow to match the needed tons of cooling. The BLUE
CFM/TON jumper wire is used to select slight adjustments to
airflow of 400, 350, or 315 CFM per ton. (See Table 3.)
B. Airflow Selection for 355MAV Furnaces
The 355MAV Condensing Variable-Speed Furnaces provide high-
and low-speed blower operation to match the capacities of com-
pressor at high and low speeds. To select recommended airflow,
refer to Table 4 and the 355MAV Installation Instructions. The
355MAV utilizes a control center that allows the installing
technician to select proper airflows.
598A
FURNACE
UNIT
MODEL/HEATING
SIZE
SIZE
060
080
036
100
120
080
048
100
120
100
060
120
HIGH-SPEED
598A
A/C SETUP
UNIT
SWITCH POSITION
SIZE
A/C-1
A/C-2
036
OFF
OFF
048
OFF
ON
060
OFF
ON
* Efficiency rating obtained at 1600 CFM. If 2000 CFM is desired, adjust airflow per 355MAV Installation Instructions.
598A
UNIT
FK4C
SIZE
001
002
036
003
005
006
005
048
006
060
006
* Airflow CFMs are given with AC/HP CFM ADJUST jumper set at NOM. Airflow can be adjusted +15% or -10% by selecting HI or LO respectively.
TABLE 3—AIRFLOW SELECTION FOR 333(B,J)AV FURNACES (CFM)
AC/HP
Cool Size
Jumper
Jumper
Position
Position
AC
HI
AC
M-LO
AC
LO
AC
LO
AC
HI
AC
M-HI
AC
M-HI
AC
HI
AC
HI
TABLE 4—AIRFLOW SELECTION FOR 355MAV FURNACES (CFM)
FURNACE MODEL/HEATING SIZE
060
A/C-3
High
Low
ON
1200
800
ON
—
—
ON
—
—
TABLE 5—AIRFLOW SELECTION FOR FK4C FAN COILS (CFM)
EASY SELECT CONTROL BOARD
SYSTEM TYPE
(Orange Wire)
AC
AC
AC
AC
AC
AC
AC
AC
For adjustments to the manual switches labeled A/C and CF and
recommended switch positions, refer to Table 4. High-speed
airflow is determined by the position of the A/C switches, and
low-speed airflow is determined by the position of the CF
switches. This furnace has a built-in, non-adjustable 90 sec off
delay for cooling mode blower operation.
C. Airflow Selection for FK4C Fan Coils
The FK4C provides high- and low-speed blower operation to
match the capacities of compressor at high and low speeds. To
select recommended airflow, refer to Table 5 and the FK4C
Installation Instructions. The FK4C utilizes an EASY SELECT
control board that allows the installing technician to select proper
airflows. For adjustments to control board and recommended A/C
SIZE and CFM ADJUST selections, refer to Table 5. This fan coil
has an adjustable blower off delay factory set at 90 sec for high-
and low-speed blower operation.
FURNACE AIRFLOW SELECTION BOARD SETTINGS
Cool CFM Per Ton Jumper Position
400
High
Low
1260
780
1260
790
1260
780
1195
865
1635
1040
1680
1040
1650
1070
1085
1300
2110
1300
080
High
Low
High
1200
800
1200
—
—
1600
—
—
1600*
A/C SIZE
AC/HP CFM ADJUST
(Blue Wire)
(Black Wire)
036
036
036
036
036
048
048
060
—12—
350
High
Low
High
1100
680
990
1100
700
990
1090
775
990
1085
785
985
1470
915
1325
1465
915
1325
1465
975
1315
1840
1150
1655
1865
1140
1640
LOW-SPEED
CF SETUP
100
SWITCH POSITION
Low
CF-1
800
OFF
1000
ON
1000
ON
High
NOM
1100
NOM
1100
NOM
1100
NOM
1100
NOM
1100
NOM
1470
NOM
1470
NOM
1835
315
Low
585
625
700
785
820
820
930
1025
1080
CF-2
CF-3
ON
OFF
ON
OFF
ON
OFF
CFM*
Low
680
680
680
680
745
910
995
1240
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