External Static Pressure - LG MULTI F Engineering Manual

F
MULTI
F
MULTI MAX
Table 86: Multi F Vertical-Horizontal Air Handling Unit External Static Pressure Setting Values Table.
Static Pressure (in. wg)
Model No. / Nominal Capacity
of Indoor Unit (Btu/h)
LMVN240HV
24,000
LMVN360HV
36,000
Unless otherwise noted, vertical-horizontal air handing units are UL listed up to 0.5 in. wg total static
1
pressure, including coil, case, duct work pressure drop, air filter, and largest kW size heater. Internal
static pressure includes coil and case only.
Airflow rate (CFM) decreases by 3% per 0.1 in. wg.
2
If external static pressure is not set correctly, the air conditioning system may not operate properly or may malfunction.
Table 87: Multi F Vertical-Horizontal Air Handling Unit Minimum Airflow by Heater Capacity.
Model No. / Nominal Capacity of
Indoor Unit (Btu/h)
LMVN240HV (24,000)
LMVN360HV (36,000)
Do not operate the air conditioning system using less than the minimum airflow. There is risk of fire or product damage.
Table 88: Electric Heater Static Pressure Drop.
Heater Capacity (kW)
0
5
10
• 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)
LMVN240HV (24,000)
LMVN360HV (36,000)
• 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 INDOOR UNITS
0.1
Airflow Rate / CFM
High 710 56
Mid 640 53
Low 480 53
High 990 80
Mid 880 65
Low 800 65
5
480 CFM
780 CFM
Static Pressure Drop (in. wg)
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. "LG" is a registered trademark of LG Corp.
0.2 0.3 0.4 0.5
Setting Value at (in. wg)
67 74 78 87
65 70 75 85
55 64 70 79
85 90 95 100
72 80 85 92
69 77 82 90
Maximum airflow rate is 400 CFM per ton. (For the 24,000 Btu/h unit, the maximum airflow rate is 2
3
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
High static pressure is 0.5 in. wg (factory setting); low static pressure is 0.3 in. wg.
4
Heater Capacity (kW)
10
480 CFM
780 CFM
0
-0.01
-0.02
Airflow Rate / CFM
High
Mid
Low
High
Mid
Low

External Static Pressure

0.6 0.7 0.8
1
94 98 98
2
91 96 96
2
84 92 92
2
103 103 103
2 2
98 103 103
2
96 101 101
2
15
Not Available Not Available
Not Available Not Available
Static Pressure Drop (in. wg)
710
640
480
990
880
800
VERTICAL-HORIZONTAL | 159
0.9 1.0
98 98
2 2
96 96
2 2
92 92
2 2
103 103
2 2
103 103
2 2
101 101
2 2
20
-0.04
-0.03
-0.03
-0.07
-0.05
-0.05