External Static Pressure
VERTICAL-HORIZONTAL INDOOR UNITS
Static Pressure (in. wg)
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
Model No. / Nominal Capacity
of Indoor Unit (Btu/h)
Airflow Rate / CFM
Setting Value at (in. wg)
1
LMVN240HV
24,000
High
710
56
67
74
78
87
94
98
98
2
98
2
98
2
Mid
640
53
65
70
75
85
91
96
96
2
96
2
96
2
Low
480
53
55
64
70
79
84
92
92
2
92
2
92
2
LMVN360HV
36,000
High
990
80
85
90
95
100
103
103
2
103
2
103
2
103
2
Mid
880
65
72
80
85
92
98
103
103
2
103
2
103
2
Low
800
65
69
77
82
90
96
101
101
2
101
2
101
2
1
Unless otherwise noted, vertical-horizontal air handing units are UL listed up to 0.5 in. wg total static
pressure, including coil, case, duct work pressure drop, air filter, and largest kW size heater. Internal
static pressure includes coil and case only.
2
Airflow rate (CFM) decreases by 3% per 0.1 in. wg.
3
Maximum airflow rate is 400 CFM per ton. (For the 24,000 Btu/h unit, the maximum airflow rate is 2
x 400 = 800 CFM). If airflow is set at the maximum rate, the external static pressure value should be
increased from high speed setting value to: From 24kBtu/h of capacity: 4; From 36kBtu/h of capacity: 5
4
High static pressure is 0.5 in. wg (factory setting); low static pressure is 0.3 in. wg.
If external static pressure is not set correctly, the air conditioning system may not operate properly or may malfunction.
Table 86:
Multi F Vertical-Horizontal Air Handling Unit External Static Pressure Setting Values Table.
Model No. / Nominal Capacity of
Indoor Unit (Btu/h)
Heater Capacity (kW)
5
10
15
20
LMVN240HV (24,000)
480 CFM
480 CFM
Not Available
Not Available
LMVN360HV (36,000)
780 CFM
780 CFM
Not Available
Not Available
Table 87: Multi F Vertical-Horizontal Air Handling Unit Minimum Airflow by Heater Capacity.
Do not operate the air conditioning system using less than the minimum airflow. There is risk of fire or product damage.
Heater Capacity (kW)
Static Pressure Drop (in. wg)
0
0
5
-0.01
10
-0.02
Table 88:
Electric Heater Static Pressure Drop.
•
The external static pressure value must be reset if an electric heater is installed. For each 0.01 in. wg. increase in static pressure, the
external static pressure should increase by 1.
•
If the external static pressure is not set properly, the provided safety device will turn off the heater (according to airflow).
Table 89:
Field-Supplied Air Filter Static Pressure Drop Factors.
Model No. / Nominal Capacity of Indoor Unit (Btu/h)
Airflow Rate / CFM
Static Pressure Drop (in. wg)
LMVN240HV (24,000)
High
710
-0.04
Mid
640
-0.03
Low
480
-0.03
LMVN360HV (36,000)
High
990
-0.07
Mid
880
-0.05
Low
800
-0.05
•
The external static pressure value must be reset if an air filter is installed. For each 0.01 in. wg. increase in static pressure, the
external static pressure should increase by 1.
•
Factory tested with MERV 4 filter media. Fan speed set value when the unit is used with field-supplied filter media.
VERTICAL-HORIZONTAL | 159
Vertical-Horizontal Air
Handling
Due to our policy of continuous product innovation, some specifications may change without notification.
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LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
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