Airedale TurboChill FreeCool 200kW - 1830kW - Manual (Page 129)

129 Chiller Technical Manual 7525355 V1.0.0_04_2013
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Chillers TurboChill™ Air Cooled and FreeCool
Differential Pressure Sensor
Ensure that the differential pressure sensor operates satisfactorily; the best way to do this is to reduce the flow to the
chiller.
From pressure curves determine the design flow rate / pressure drop
Make sure that any effects of glycol in the system are taken into account (flow rate and pressure drop).
Input into the controller the reduced pressure drop (kPa) value (normally 80% of design flow rate)
Once this value is programmed into the controller the water flow rate can be reduced to verify that the low flow alarm is
activated.
Ensure that the tubes connected to the sensor are insulated.
Flow Switch
A “paddle” type flow switch is fitted, wired to the chiller control panel and tested. This should be fitted on the outlet of the
evaporator and before isolation valves.
A flow switch must also be fitted on the condenser outlet (water cooled models).
Pump Interlock
Check that the pump interlock is fitted and functioning correctly.