Daikin DWSC079 Installation, Operation And Maintenance Manual page 23

Field water piping to the inlet and outlet connections must be installed according to good piping practices and include
stop valves to isolate the cooler for servicing. A cleanable filter (40 mesh maximum), and drain valve or plug must also
be field-installed. The water supply for the oil cooler should be from the chilled water circuit or from a clean,
independent source, no warmer than 80F (27C), such as city water. When using chilled water, it is important that the
water pressure drop across the evaporator is greater than the pressure drop across the oil cooler or insufficient oil cooler
flow will result. If the pressure drop across the evaporator is less than the oil cooler, the oil cooler must be piped across
the chilled water pump, provided that its pressure drop is sufficient. The water flow through the oil cooler will be
adjusted by the unit's regulating valve so that the temperature of oil supplied to the compressor bearings (leaving the oil
cooler) is between 95F and 105F (35C and 40C).
Table 5, DWSC, Oil Cooler Data
DWSC/DHSC 079 - 087
Flow, gpm
Inlet Temperature, F
Outlet Temperature, F
Pressure Drop, ft.
DWSC/DHSC 100 - 126
Flow, gpm
Inlet Temperature, F
Outlet Temperature, F
Pressure Drop, ft.
Table 6, DWSC with Mounted VFD, Oil Cooler Data
DWSC/DHSC 079 - 087
Flow, gpm
Inlet Temperature, F
Outlet Temperature, F
Pressure Drop, ft.
DWSC/DHSC 100 - 126
Flow, gpm
Inlet Temperature, F
Outlet Temperature, F
Pressure Drop, ft.
NOTES:
DWDC dual compressor units will have twice the cooling water flow rate of the comparable DWSC chiller and the
1.
pressure drop will be the same.
Pressure drops include valves on the unit.
2.
Table 7, Freestanding VFD, Cooling Requirements
DWSC/DHSC 079 - 087
Flow, gpm
Inlet Temperature, F
Outlet Temperature, F
Pressure Drop, ft.
DWSC/DHSC 100 - 126
Flow, gpm
Inlet Temperature, F
Outlet Temperature, F
Pressure Drop, ft.
Cold Side Water
11.9 2.9
80.0 65.0
87.3 94.5
9.9 0.6
21.9 5.1
80.0 65.0
87.0 95.0
8.7 0.5
Cold Side Water
13.4 4.0
80.0 65.0
90.3 99.6
30.5 6.7
24.4 7.0
80.0 65.0
89.8 100.1
30.6 15.7
Cooling Cooling
Water Water
1.5 1.0
80.0 65.0
114 114
13.0 6.8
2.5 1.9
80.0 65.0
114 114
25.2 15.7
2.0 1.54
55.0 45.0
98.4 101.5
0.3 0.2
3.5 2.7
55.0 45.0
99.1 102.4
0.2 0.1
2.9 2.3
55.0 45.0
103.1 105.6
4.8 3.6
5.0 4.0
55.0 45.0
103.6 106.2
11.4 9.3
Cooling Cooling
Water Water
0.9 0.7
55.0 45.0
114 114
4.8 3.6
1.5 1.3
55.0 45.0
114 114
11.4 9.3
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