If the CFM is above or below the specified value, the supply air
motor pulley may have to be readjusted. After one hour of op-
eration, check the belt and pulleys for tightness and alignment.
WARNING: Failure to properly adjust the total system CFM
can result in extensive blower damage.
After readings have been obtained, remove the tubes and seal
up the drilled holes in the side panel. Dot plugs (5/16" - P/N 029-
13880-000) are available through normal parts ordering
procedures.
NOTE: Shut down the heat pump system before taking any
test measurements to assure a dry indoor coil.
035-11845-001-A-0304
8
Unitary Products Group
FIG. 9 - HOLE LOCATIONS FOR PRESSURE
DROP READINGS
PRESSURE DROP
ACROSS DRY INDOOR COIL
0.1
0.2
0.3
0.4
0.5
2000
2400
2800
3200
3600
4000
4400
4800
5200
SUPPLY AIR CFM
PR
ESSU
R
E
D
R
OP (
IWG)
FHP090
FHP120
FIG. 10 - PRESSURE DROP ACROSS A DRY
INDOOR COIL VS. SUPPLY AIR CFM
RPM
CFM
ESP
2
BHP
KW
ESP
2
BHP
KW
ESP
2
BHP
KW
ESP
2
BHP
KW
ESP
2
BHP
KW
FCHP090
(60 Hz)
2400
2700
3000
3300
3600
600
0.30
0.62
0.79
0.21
0.70
0.76
0.09
0.78
0.89
-
-
-
-
-
-
655
0.43
0.70
0.86
0.39
0.78
0.83
0.26
0.87
0.97
0.11
0.96
1.07
-
-
-
700
0.52
0.77
0.93
0.48
0.85
0.90
0.40
0.95
1.06
0.28
1.06
1.16
0.14
1.17
1.26
800
0.82
0.97
1.10
0.81
1.06
1.07
0.74
1.18
1.27
0.63
1.30
1.38
0.51
1.42
1.49
880
1.10
1.11
1.24
1.09
1.24
1.21
1.02
1.37
1.45
0.91
1.50
1.55
0.78
1.64
1.70
900
1.15
1.15
1.27
1.14
1.28
1.24
1.07
1.42
1.49
0.97
1.55
1.60
0.87
1.70
1.74
1000
1.49
1.35
1.46
1.47
1.48
1.43
1.42
1.63
1.65
1.35
1.81
1.82
1.27
2.02
2.02
FDHP120
(60 Hz)
3200
3600
4000
4400
4800
700
0.30
1.01
1.17
0.15
1.17
1.27
-
-
-
-
-
-
-
-
-
800
0.66
1.25
1.38
0.52
1.42
1.51
0.31
1.60
1.64
0.08
1.80
1.78
-
-
-
900
0.99
1.48
1.60
0.87
1.70
1.77
0.69
1.92
1.93
0.47
2.18
2.09
0.19
2.45
2.23
950
1.20
1.61
1.71
1.08
1.86
1.90
0.90
2.12
2.07
0.72
2.39
2.23
0.41
2.67
2.42
1000
1.37
1.75
1.83
1.27
2.02
2.02
1.11
2.30
2.20
0.92
2.60
2.39
0.63
2.90
2.59
11
Unit resistance is based on a wet indoor coil and clean filters.
2
Available static pressure in IWG to overcome the resistance of the duct system and any accessories added to the unit. Refer to the Tables 5 & 6 for the resistance of these accessories and for
additional motor and drive data .
3
Motors can be selected to operate into the service factor because they are located in the moving air stream, upstream of any heating device.
TABLE 4 - SUPPLY AIR BLOWER PERFORMANCE
1,3
(60 Hz Units)
Exceeds the BHP limitations of the standard blower motor.
RPM range for the standard drive components.
