Table 1: Component Static Pressure Drops (Iwg) - Johnson Controls GVA Series Start-Up & Operation

12. Check the air balance.
a. Start the supply air blower motor.
b. Adjust the resistances in both the supply and
the return air duct systems to balance the
air distribution throughout the conditioned
space.

Table 1: Component Static Pressure Drops (iwg)

Component
Evaporator Coil - Std. Capacity,
Std. Efficiency
Evaporator Coil - High Capacity, Std.
Efficiency and Std. Capacity, High
Efficiency
Evaporator Coil - Std. Capacity,
Std. Efficiency
Evaporator Coil - High Capacity, Std.
Efficiency and Std. Capacity, High
Efficiency
Evaporator Coil - Std. Capacity,
Std. Efficiency
Evaporator Coil - High Capacity, Std.
Efficiency and Std. Capacity, High
Efficiency
Evaporator Coil - Std. Capacity,
Std. Efficiency
Evaporator Coil - High Capacity, Std.
Efficiency and Std. Capacity, High
Efficiency
25–30 Ton Hot Gas Reheat (HGRH) Coil
40–50 Ton HGRH Coil
Return Air Opening
Bottom, Top, Front, Sides
Bottom with ERW
Damper
Bottom, Top, Front, Sides
Bottom with ERW
Damper
Exhaust Air Opening
25–30 Ton Hood and Damper
40–50 Ton Hood and Damper
Supply Air Opening
Bottom
Side
All Discharges in Blank Section
Bottom
Side
All Discharges in Blank Section
Johnson Controls
Start-Up & Operation Guide | 5586996-JSG-A-0120
NOTE: Job specifications may require that air balanc-
ing be completed by someone other than the
start-up contractor.
5,000 6,000 8,000 10,000 12,000 14,000 16,000 18,000 20,000
0.14 0.18 0.28 0.41
0.15 0.20 0.32 0.46
0.16 0.22 0.36 0.51
0.18 0.24 0.38 0.55
- - 0.21 0.30
- - 0.21 0.30
- - 0.21 0.30
- - 0.25 0.35
0.11 0.13 0.27 0.39
- - 0.18 0.25
0.01 0.02 0.03 0.05
0.01 0.01 0.03 0.04
0.01 0.02 0.03 0.05
- - 0.01 0.02
0.01 0.01 0.01 0.02
- - 0.01 0.02
0.30 0.33 0.37 0.40
- - 0.19 0.22
0.02 0.02 0.04 0.06
0.02 0.02 0.04 0.06
0.01 0.01 0.02 0.03
- - 0.02 0.03
- - 0.02 0.03
- - 0.01 0.02
SCFM
0.55 - -
0.62 - -
0.69 - -
0.75 - -
0.40 0.51 0.64 0.77
0.40 0.51 0.64 0.77
0.40 0.51 0.64 0.77
0.47 0.61 0.76 0.92
0.53 - -
0.33 0.43 0.53 0.64
0.07 - -
0.06 - -
0.07 - -
0.03 0.04 0.05 0.06
0.03 0.04 0.05 0.06
0.03 0.04 0.05 0.06
0.42 - -
0.25 0.28 0.30 0.32
0.09 - -
0.09 - -
0.05 - -
0.05 0.06 0.08 0.10
0.05 0.06 0.08 0.10
0.03 0.04 0.05 0.06
- -
- -
- -
- -
0.91
0.91
0.91
1.09
- -
0.76
- -
- -
- -
0.08
0.08
0.08
- -
0.34
- -
- -
- -
0.13
0.13
0.08
11