Carrier 30RY 017 Installation, Operation And Maintenance Instructions page 28

Service C
Carry out the operations listed under Service B.
Refrigerant circuit
- Check the leak-tightness of the circuit and ensure that
there is no piping damage.
- Carry out an oil contamination test. If acid, water or
metallic particles are present replace the oil in the circuit.
- Verify the tightening of the thermostatic mechanism of
the expansion device.
- Full-load operating test. In addition to the checks carried
out under Service B, validate the values of the heat
exchanger inlet and outlet tightening.
- Check the operation of the high-pressure and low-pressure
switches. Replace them if there is a fault.
- Check the fouling of the filter drier (by checking the
temperature difference in the copper piping). Replace it if
necessary.
Electrical checks
- Check the status of the electrical cables and their
insulation.
- Carry out an operating test of the electric evaporator
heaters, compressor crankcase heater, piping and
expansion device, as required.
- Check the phase/earth insulation of the compressors, fans
and pumps.
- Check the compressor, fan and pump winding status.
Mechanical checks
- Check the tightening of the fan tower, fan, compressor
and control box fixing bolts.
- Check that no water has penetrated into the control box.
- All metallic parts of the unit (chassis, casing panels,
control boxes, heat exchangers etc.) are protected against
corrosion by a coating of powder or liquid paint. To
prevent the risk of blistering corrosion that can appear
when moisture penetrates under the protective coatings, it
is necessary to carry out periodic checks of the coating
(paint) condition.
Water circuit checks
- Clean the water filter.
- Purge the circuit with air.
- Verify the correct operation of the water flow switch.
- Check the status of the thermal piping insulation.
- Check the water flow by checking the heat exchanger
pressure difference (using a pressure gauge).
- Check the concentration of the anti-freeze protection
solution (ethylene glycol or polyethylene glycol).- Check
the satus of the heat transfer fluid or the water quality.
- Check the steel pipe corrosion.
Service D
- Single pump and dual pump.
- Mechanical seal: replace this every 13000 operating
hours.
- Bearing: replace this every 20000 operating hours.
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