AIREDALE TurboChill TCC11R04G-01, Техническое руководство

Страница: 149 / 197

M
ain
te
nanc
e
Chillers TurboChill™ R1234ze Air Cooled and FreeCool
149
Chiller Technical Manual 7752785 V1.12.0_10_2018
Maintenance
Waterside
Procedures
Water Strainer
A water strainer must be fitted to the inlet side of the chiller evaporator.
Failure to do so may result in severe damage and will void the AIREDALE warranty.
Water Flow Rate
Check that the design water flow rate is available to the unit. If not available do not turn unit on.
Waterside Pressure Drop
Measure the waterside pressure drop of the unit ensuring that the pump (if fitted) is operating.
Glycol Strength
Check and record the glycol type and strength. Low levels of glycol can cause freeze up problems when operating at
low temperatures or during the unit off state during cold ambient conditions.
Glycol concentration is measured by use of a Refractometer.
Differential Pressure Sensor
Ensure that the differential pressure sensor operates satisfactorily; the best way to do this is to carefully reduce the flow
to the chiller to simulate a flow fail.
The compressor cannot operate without the correct water flow rate and will invalidate warranty.
Disable compressor operation whilst simulating a low flow.
Procedure
● 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 carefully reduced to verify that the low
flow alarm is activated.
Ensure that the tubes connected to the sensor are insulated.
Ensure correct flow rate is available to the chiller before compressors are reinstated.
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.
Pump Interlock
Check that the pump interlock is fitted and functioning correctly.
Task
Frequency
Waterside
3 Mths 12 Mths 60 Mths
Check pressure drop of water strainer against
graphs. If excessive clean the strainer.
●
Visually inspect pipe and pipework insulation.
Ensure pipework clamps are secure.
●
Inspect for water leakage.
●
Check pressure drop of evaporator against
graphs. Clean evaporator if excessive.
●
Check condition of Water / Glycol solution to ensure that the
system is protected against corrosion, scale and microbiological
fouling, ensuring maximum heat transfer efficiency.
●
Service Tools/Test Equipment
• Spanners
• Manometer
• Thermometer
• Refractometer
Safety Equipment
• Safety Glasses/Goggles
• Gloves
• Overalls