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11 OPERATOR RESPONSIBILITIES
It is important that the operator is properly trained and familiar with the equipment before working on the unit. In addition to
reading this manual, the operator must study the manual operation of the microprocessor and the wiring diagram to
understand the sequence of start- up, operation, shutdown sequences, and the criterion of operation of all safety devices.
During the initial start-up of the unit an authorized technician is available to answer any questions and educate on the
proper functioning. We recommend the operator to maintain a record of the operating data for each unit installed and all
maintenance activities and periodic service. If the operator observes abnormal or unusual operating conditions, consult the
authorized service technician.
12 START-UP PRELIMINARY PROCEDURES
12.1 STARTING CHECK
Before starting the unit, even only momentarily, all the machinery supplied by the chilled water, like the air handling units,
pumps, etc. have to be checked. The pump auxiliary contacts and the flow switch have to be connected to the control
panel as indicated in the electrical diagram. Before carrying out interventions on the valve regulations, loosen the relevant
valve gland. Open the discharge valve of the compressor. Open the liquid shutoff valve placed on the liquid line. Measure
the suction pressure. If it is lower than 0.42 MPa pry open the solenoid valve on the liquid line by means of an electrical
bridge. Bring the suction pressure to 0.45 MPa, then remove the jumper. Charge all the water circuit progressively. Starts
up the water pump of the evaporator with the calibration valve shut and then slowly open it.
Discharge the air from the high points of the water circuit and check the direction of the water flow. Carry out calibration of
the flow by using a measurer (if present or available) or by means of a combination of the readings of the manometers and
the thermometers. In the starting phase calibrate the valve on the pressure difference read on the manometers, carry out
drainage of the tubes and then carry out fine calibration on the temperature difference between the water in and the water
out. The regulation is calibrated in the factory for water in to the evaporator at 12°C and water out at 7°C. With the general
switch open, check that the electrical connections are tightly clamped. Check for any possible refrigerant leaks. Check that
the electrical data on the label correspond to those of the mains supply. Check that the thermal charge available is
appropriate for starting.
12.2 REFRIGERANT CHARGE
Trane CCUF units are shipped without any refrigerant charge
Danger: Do not use the compressor to vacuum the system.
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