York ZJ Series - Air Balancing Procedure; Air Balancing Caution; Checking Air Quantity (CFM)

251933-YTG-B-0806
40 Unitary Products Group
Additional Static Resistance
Size
(Tons)
CFM Cooling Only
1
1. Add these values to the available static resistance in the respective Blower Performance
Tables.
Economizer
23
2. Deduct these values from the available external static pressure shown in the respective
Blower Performance Tables.
3. The pressure drop through the economizer is greater for 100% outdoor air than for 100%
return air. If the resistance of the return air duct is less than 0.25 IWG, the unit will deliver
less CFM during full economizer operation.
Electric Heat kW
2
7 - 15 20 - 30
036 (3.0)
048 (4.0)
060 (5.0)
1000 0.08 0.07 0.04 0.06
1200 0.10 0.08 0.05 0.07
1400 0.12 0.09 0.06 0.08
1600 0.14 0.11 0.07 0.09
1800 0.16 0.13 0.08 0.11
2000 0.18 0.15 0.10 0.13
2200 0.20 0.17 0.12 0.15
2400 0.23 0.20 0.14 0.17
2600 0.26 0.23 0.16 0.20
2800 0.29 0.26 0.19 0.23
3000 0.32 0.30 0.22 0.26
Altitude/Temperature Correction Factors
Air
Temp.
Altitude (Ft.)
0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000
40 1.060 1.022 0.986 0.950 0.916 0.882 0.849 0.818 0.788 0.758 0.729
50 1.039 1.002 0.966 0.931 0.898 0.864 0.832 0.802 0.772 0.743 0.715
60 1.019 0.982 0.948 0.913 0.880 0.848 0.816 0.787 0.757 0.729 0.701
70 1.000 0.964 0.930 0.896 0.864 0.832 0.801 0.772 0.743 0.715 0.688
80 0.982 0.947 0.913 0.880 0.848 0.817 0.787 0.758 0.730 0.702 0.676
90 0.964 0.929 0.897 0.864 0.833 0.802 0.772 0.744 0.716 0.689 0.663
100 0.946 0.912 0.880 0.848 0.817 0.787 0.758 0.730 0.703 0.676 0.651
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