Operating instructions

IMM ACZ/AGZ-4 ACZ / AGZ-BM 19
Evaporator Temperature Drop Factors
Performance tables are based on a 10 degree F (5 degree C) temperature drop through the evaporator.
Adjustment factors for applications with temperature ranges from 6 degree F to 16 degree F (3.3
degree C to 8.9 degree C) are found in
Table 12 and Table 13. Ranges outside these temperatures
can affect the control system's capability to maintain acceptable control and must not be used.
The maximum water temperature that can be circulated through the evaporator in a non-operating
mode is 100°F (37.8°C).
Fouling Factor
Performance tables are based on water with a fouling factor of:
per ARI 550/590-98.
)/0176.0(/0001.0
22
kWCmorBTUFhrft °×°××
As fouling is increased, performance decreases. For performance at other than 0.0001 (0.0176)
fouling factor, refer to
Table 12 and Table 13. Foreign matter in the chilled water system will
adversely affect the heat transfer capability of the evaporator and could increase the pressure drop
and reduce the water flow. Maintain proper water treatment to provide optimum unit operation.
Table 12, Capacity and Power Derates, Models AGZ 026 to 070
Fouling Factor
Chilled Water
Delta T
0.0001 (0.0176) 0.00025 (0.044) 0.00075 (0.132) 0.00175 (0.308)
Altitude
°F °C Cap. Power Cap. Power Cap. Power Cap. Power
6 3.3 0.978 0.993 0.975 0.991 0.963 0.987 0.940 0.980
8 4.4 0.989 0.996 0.986 0.994 0.973 0.990 0.950 0.983
10 5.6 1.000 1.000 0.996 0.999 0.984 0.994 0.961 0.987
12 6.7 1.009 1.003 1.005 1.001 0.993 0.997 0.969 0.990
14 7.7 1.018 1.004 1.014 1.003 1.002 0.999 0.978 0.991
Sea
Level
16 8.9 1.025 1.007 1.021 1.006 1.009 1.001 0.985 0.994
6 3.3 0.977 1.001 0.973 1.000 0.961 0.996 0.938 0.989
8 4.4 0.987 1.006 0.984 1.004 0.971 1.000 0.948 0.993
10 5.6 0.998 1.009 0.995 1.007 0.982 1.003 0.959 0.996
12 6.7 1.007 1.011 1.004 1.010 0.991 1.006 0.967 0.998
14 7.7 1.014 1.014 1.011 1.013 0.998 1.009 0.974 1.001
2000 feet
16 8.9 1.022 1.016 1.018 1.014 1.005 1.010 0.981 1.003
6 3.3 0.973 1.011 0.970 1.010 0.957 1.006 0.935 0.998
8 4.4 0.984 1.014 0.980 1.013 0.968 1.009 0.945 1.001
10 5.6 0.995 1.019 0.991 1.017 0.979 1.013 0.955 1.005
12 6.7 1.004 1.021 1.000 1.020 0.987 1.016 0.964 1.008
14 7.7 1.011 1.024 1.007 1.023 0.994 1.018 0.971 1.011
4000 feet
16 8.9 1.018 1.027 1.014 1.026 1.002 1.021 0.978 1.014
6 3.3 0.969 1.021 0.966 1.020 0.954 1.016 0.931 1.008
8 4.4 0.980 1.026 0.977 1.024 0.964 1.020 0.942 1.013
10 5.6 0.989 1.029 0.986 1.027 0.973 1.023 0.950 1.015
12 6.7 0.998 1.033 0.995 1.031 0.982 1.027 0.959 1.020
14 7.7 1.007 1.036 1.004 1.034 0.991 1.030 0.967 1.022
6000 feet
16 8.9 1.014 1.037 1.011 1.036 0.998 1.031 0.974 1.024
6 3.3 0.964 1.034 0.961 1.033 0.949 1.028 0.926 1.021
8 4.4 0.975 1.037 0.971 1.036 0.959 1.031 0.936 1.024
10 5.6 0.986 1.041 0.982 1.040 0.970 1.036 0.947 1.028
12 6.7 0.995 1.044 0.991 1.043 0.979 1.038 0.955 1.031
14 7.7 1.002 1.047 0.998 1.046 0.986 1.041 0.962 1.034
8000 feet
16 8.9 1.009 1.050 1.005 1.049 0.993 1.044 0.969 1.037