Dx Cooler Chilled Water Flow Switch; Dx Cooler And Flooded Cooler Units; Preparation For Winter Shutdown - Carrier AQUAFORCE 30XA080-500 Controls, Start-Up, Operation, Service And Troubleshooting Instructions

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DX COOLER CHILLED WATER FLOW SWITCH — A
factory-installed flow switch is installed in the entering water
nozzle for all machines. See Fig. 59 and 60. This is a thermal-
dispersion flow switch. Figure 59 shows typical installation. If
nuisance trips of the sensor are occurring, follow the steps be-
low to correct:
1. Check to confirm that all strainers are clean, valves are
open and pumps are running. For the case of variable
frequency drive (VFD) controlled pumps, ensure the
minimum speed setting has not been changed.
2. Measure the pressure drop across the cooler. Use the
cooler pressure drop curves on pages 62-67 to calculate
the flow and compare this to system requirements.
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Fig. 56 — Bolt Tightening Sequence, 30XA142,162,182,202
Fig. 57 — Bolt Tightening Sequence, 30XA222, 242, 262, 282
Fig. 58 — Bolt Tightening Sequence, 30XA302, 327, 352
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a30-5407
a30-5408

DX Cooler and Flooded Cooler Units

PREPARATION FOR WINTER SHUTDOWN — If the
unit is not operational during the winter months, at the end of
cooling season complete the following steps.
Failure to remove power before draining heater equipped
coolers and hydronic packages can result in heater tape and
insulation damage.
1. If the unit has optional heater tapes on the cooler and the
cooler will not be drained, do not shut off power discon-
nect during off-season shutdown. If the unit has optional
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CAUTION