®
550.13-N10Y
13
Unitary Products Group
4.
Knowing the pressure drop across a dry coil the actual
CFM through the unit can be determined from the curve
in Fig. 16.
If the CFM is above or below the specified value, the supply
air motor pulley may have to be re-adjusted. After one hour
of operation, check the belt and pulleys for tightness and
alignment.
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 Source One Parts
ordering procedures.
NOTE: Shut down the heat pump system before taking any
test measurements to assure a dry indoor coil.
FIGURE 15 : HOLE LOCATIONS FOR PRESSURE
DROP READINGS
5 / 1 6 "
H O L E
5 / 1 6 "
H O L E
1 8 "
7 "
2 2 "
1 0 "
E V A P O R A T O R
C O I L
F I L T E R S
C O I L S E C T I O N
FIGURE 16 : CFM VS PRESSURE DROP
0.1
0.2
0.3
0.4
0.5
4800
5600
6400
7200
8000
8800
9600
SUPPLY AIR CFM
PRESSURE DROP (IWG)
KES180
LES240
TABLE 7: SUPPLY AIR PREFORMANCE KES180
1
RPM
CFM
4800
5400
6000
6600
ESP
2
BHP
3
K
W
4
ESP
2
BHP
3
K
W
4
ESP
2
BHP
3
K
W
4
ESP
2
BHP
3
K
W
4
600
0.38
1.49
1.42
0.23
1.74
1.66
0.02
1.99
1.89
---
---
---
650
0.58
1.73
1.65
0.43
1.99
1.89
0.24
2.29
2.18
---
---
---
700
0.79
1.97
1.87
0.65
2.28
2.17
0.47
2.59
2.46
0.24
2.92
2.78
750
1.00
2.25
2.14
0.88
2.58
2.46
0.70
2.91
2.77
0.48
3.30
3.14
800
1.22
2.54
2.42
1.11
2.89
2.75
0.95
3.28
3.12
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---
850
1.45
2.85
2.71
1.35
3.24
3.08
---
---
---
---
---
---
900
1.69
3.19
3.04
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1.
Unit resistance based on a wet evaporator coil, clean filters, and unit tested in horizontal configuration.
2.
Available static pressure in IWG to overcome the resistance of the duct system and any accessories added to the
unit. Refer to the respective tables for the resistance of these accessories and for additional motor and drive data.
3.
Motors can be selected to operate into their service factor because they are located in the moving airstream,
upstream of any heating device.
4.
kW is based on 6% drive losses and a motor efficiency of 83.1%. Calculate kW by using the following formula: kW
= (746 X BHP X DRIVE LOSSES) / (1000 X MOTOR EFFICIENCY)