168 | VAH
MUL
TI V Ducted Indoor Unit Engineering Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
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Table 127:
Minimum Airflow by Heater Capacity.
Do not operate with less than the minimum airflow. If an airflow is
used below the minimum, there is a risk of damage to the product.
Airflow rates in the table above are listed in CFM.
Flow rate (CFM) is decreased by 3% per 0.1 in wg from 0.8 in wg to 1.0 in wg.
Capacity (MBh [tons])
Heater Capacity (kW)
3
5
8
10
15
20
12 (1.0)
380
380
380
Not available
Not available
Not available
18 (1.5)
480
480
480
480
Not available
Not available
24 (2.0)
480
480
480
480
Not available
Not available
30 (2.5)
630
630
630
630
Not available
Not available
36 (3.0)
900
900
900
900
900
900
42 (3.5)
1,000
1,000
1,000
1,000
1,000
1,000
48 (4.0)
1,000
1,000
1,000
1,000
1,000
1,000
54 (4.5)
1,300
1,300
1,300
1,300
1,300
1,300
Table 128: Electric Heater Static Pressure Drop Factors.
in wg = inch water gauge
If the electric heater has been installed, then the ESP value has to be set.
For every increase in static pressure by 0.01 in wg, the ESP value must be increased by 1.
If the ESP setting value is inappropriate, the provided safety device will turn the heater off according to
the airflow.
Heater Capacity (kW)
Static Pressure Drop (in. wg)
0
0
3
-0.01
5
-0.01
8
-0.02
10
-0.02
15
-0.04
20
-0.06
Do not operate with less than the minimum airflow. If an airflow is
used below the minimum, there is a risk of fire, which may lead to
physical injury or death.
VERTICAL / HORIZONTAL AIR HANDLER
Heater Capacity Airflow / Static Pressure Drop Factors
