Daikin AGZ 025D - Page 8

8 AGZ 025D through 190D OMM 1166-1
Table 7, Capacity and Power Derates, Models AGZ 140D to 190D
Altitude
Chilled Water
Delta T
Fouling Factor
0.0001 (0.0176)
0.00025 (0.044)
0.00075 (0.132)
0.00175 (0.308)
°F
°C
Cap.
Power
Cap.
Power
Cap.
Power
Cap.
Power
Sea
Level
6
3.3
0.990
0.997
0.976
0.994
0.937
0.983
0.868
0.964
8
4.4
0.994
0.998
0.981
0.995
0.942
0.984
0.872
0.965
10
5.6
1.000
1.000
0.987
0.996
0.947
0.986
0.877
0.967
12
6.7
1.005
1.001
0.991
0.997
0.951
0.986
0.881
0.968
14
7.7
1.009
1.002
0.995
0.998
0.955
0.987
0.884
0.968
16
8.9
1.013
1.004
1.000
1.000
0.960
0.989
0.889
0.970
2000 feet
6
3.3
0.987
1.005
0.974
1.002
0.934
0.991
0.865
0.972
8
4.4
0.992
1.006
0.979
1.003
0.940
0.992
0.870
0.973
10
5.6
0.997
1.008
0.984
1.004
0.944
0.994
0.875
0.975
12
6.7
1.002
1.009
0.989
1.005
0.949
0.994
0.879
0.975
14
7.7
1.007
1.011
0.993
1.007
0.953
0.996
0.883
0.977
16
8.9
1.011
1.012
0.998
1.008
0.958
0.997
0.887
0.978
4000 feet
6
3.3
0.985
1.014
0.972
1.010
0.933
0.999
0.864
0.980
8
4.4
0.991
1.015
0.977
1.012
0.938
1.001
0.869
0.981
10
5.6
0.995
1.016
0.982
1.013
0.943
1.002
0.873
0.982
12
6.7
1.000
1.018
0.987
1.014
0.947
1.003
0.877
0.984
14
6.8
1.005
1.019
0.991
1.015
0.951
1.004
0.881
0.985
16
8.9
1.009
1.021
0.995
1.017
0.955
1.006
0.884
0.987
6000 feet
6
3.3
0.982
1.023
0.969
1.020
0.930
1.009
0.861
0.989
8
4.4
0.988
1.025
0.975
1.022
0.935
1.010
0.866
0.991
10
5.6
0.992
1.026
0.979
1.022
0.940
1.011
0.870
0.992
12
6.7
0.997
1.028
0.984
1.024
0.944
1.013
0.875
0.994
14
7.7
1.002
1.029
0.989
1.025
0.949
1.014
0.879
0.995
16
8.9
1.006
1.031
0.992
1.027
0.952
1.016
0.882
0.996
8000 feet
6
3.3
0.979
1.034
0.966
1.031
0.927
1.019
0.859
1.000
8
4.4
0.984
1.036
0.971
1.032
0.932
1.021
0.863
1.002
10
5.6
0.990
1.037
0.976
1.033
0.937
1.022
0.868
1.002
12
6.7
0.993
1.039
0.980
1.035
0.941
1.024
0.871
1.004
14
7.7
0.998
1.041
0.985
1.037
0.945
1.026
0.875
1.006
16
8.9
1.003
1.041
0.990
1.038
0.950
1.026
0.879
1.007
Evaporator Freeze Protection
Evaporator freeze-up can be a concern in the
application of air-cooled water chillers. To
protect against freeze-up, insulation and an
electric heater cable are furnished with the
unit. This protects the evaporator down to -
20°F (-29°C) ambient air temperature.
Although the evaporator is equipped with
freeze protection, it does not protect water
piping external to the unit or the evaporator
itself if there is a power failure or heater cable
burnout. Consider the following
recommendations for additional protection.
1. If the unit will not be operated during the
winter, drain evaporator and chilled water
piping and flush with glycol. Drain and
vent connections are provided on the
evaporator to ease draining.
2. Add a glycol solution to the chilled water
system to provide freeze protection.
Freeze point should be approximately ten
degrees below minimum design ambient
temperature.
3. The addition of thermostatically controlled
heat and insulation to exposed piping.
4. Continuous circulation of water through
the chilled water piping and evaporator.
The evaporator heater cable is factory wired to
the 115-volt circuit in the control box. This
power should be supplied from a separate
source, but it can be supplied from the control
circuit. Operation of the heater cable is