Lennox LGH420 Installation Instructions

Page 27
BLOWER DATA
POWER EXHAUST FANS
STANDARD STATIC (
1
TWO FAN OPERATION)
Return Duct
Negative Static Pressure
Inches Water Gauge
Air Volume
cfm
Return Duct
Negative Static Pressure
Inches Water Gauge
Air Volume
cfm
0 12,100 0.50 5700
0.05 11,600 0.55 5000
0.10 11,150 0.60 4300
0.15 10,600 0.65 3800
0.20 10,100 0.70 3400
0.25 9500 0.75 3000
0.30 8900 0.80 2500
0.35 8200 0.85 2300
0.40 7400 0.90 2000
0.45 6500
1
For one fan operation, use half of the air volume value.
OUTDOOR AIR PERCENTAGE VS. FRESH AIR DAMPER ANGLE - Less ERW
Fresh Air
Damper
Opening Angle
Percentage of Outdoor Air Available at Various
Return Duct Static Pressures - in. w.g.
0.2 0.4 0.6 0.8
10° 5% 11% 16% 21%
20° 19% 25% 30% 36%
30° 34% 39% 44% 50%
40° 48% 53% 59% 64%
50° 62% 68% 73% 79%
60° 77% 82% 87% 93%
70° 91% 96% 100% 100%
80° 100% 100% 100% 100%
NOTE - Outdoor air percentage will vary when a variable frequency drive (VFD) drive is used on the supply air blower.
1
ERW
Static
Pressure
Percentage of Outdoor Air Available at Various Return Duct Static Pressures
0.6 Return Duct Static 0.8 Return Duct Static
in. w.g. 1.2 1.0 0.8 0.6 0.4 0.2 1.2 1.0 0.8 0.6 0.4 0.2
Fresh Air
Damper
Opening
Angle
10° - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
20° 25% 19% 14% 9% 4% - - - 30% 25% 19% 14% 9% 4%
30° 39% 34% 28% 23% 18% 13% 44% 39% 34% 28% 23% 18%
40° 54% 48% 43% 38% 32% 27% 59% 54% 48% 43% 38% 32%
50° 68% 62% 57% 52% 46% 41% 73% 68% 62% 57% 52% 46%
60° 84% 77% 71% 66% 61% 55% 87% 84% 77% 71% 66% 61%
70° 97% 91% 86% 81% 75% 70% 100% 97% 91% 86% 81% 75%
80° 100% 100% 100% 95% 89% 84% 100% 100% 100% 100% 95% 89%
NOTE - Outdoor air percentage will vary when a variable frequency drive (VFD) drive is used on the supply air blower.
1
See page 57 for Energy Recovery Wheel Specications.
OUTDOOR AIR PERCENTAGE VS. FRESH AIR DAMPER ANGLE - With ERW
1
ERW
Static
Pressure
Percentage of Outdoor Air Available at Various Return Duct Static Pressures
0 Return Duct Static 0.2 Return Duct Static 0.4 Return Duct Static
in. w.g. 1.2 1.0 0.8 0.6 0.4 0.2 1.2 1.0 0.8 0.6 0.4 0.2 1.2 1.0 0.8 0.6 0.4 0.2
Fresh Air
Damper
Opening
Angle
10° - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
20° 9% 4% - - - - - - - - - - - - 14% 9% 4% - - - - - - - - - 19% 14% 9% 4% - - - - - -
30° 23% 18% 13% 8% 2% - - - 28% 23% 18% 13% 8% 2% 34% 28% 23% 18% 13% 8%
40° 38% 32% 27% 22% 17% 11% 43% 38% 32% 27% 22% 17% 48% 43% 38% 32% 27% 22%
50° 52% 46% 41% 36% 31% 25% 57% 52% 46% 41% 36% 31% 62% 57% 52% 46% 41% 36%
60° 66% 61% 55% 50% 45% 39% 71% 66% 61% 55% 50% 45% 77% 71% 66% 61% 55% 50%
70° 81% 75% 70% 64% 59% 54% 86% 81% 75% 70% 64% 59% 91% 86% 81% 75% 70% 64%
80° 95% 89% 84% 78% 73% 68% 100% 95% 89% 84% 78% 73% 100% 100% 95% 89% 84% 78%

Lennox LGH420 Specifications

General

Brand	Lennox
Model	LGH420
Category	Air Conditioner
Language	English