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14 START-UP
14.1
PRELIMINARY CONTROLS
Before starting up the equipment it is very important to check that all the operations described in the paragraph "CHECK
LIST – MANDATORY OPERATION CONTROL BEFORE START UP" have been carried out correctly.
Moreover check that all the mechanical and electric equipment has been tightened perfectly. Particular attention
should be paid to the main components (compressor, exchangers, ventilators, electrical motors, and pump) if loose
fastenings are found, tighten them well before starting up the machine.
The oil heaters have to be inserted at least 8 hours before starting up. Ensure that the compressors' carter is hot. Open the
compressor valve and the cooling circuit one, which may have been shut for charging. Control all the machinery connected
to the unit.
DANGER: The chilled water circuit may be under pressure. Bring down this pressure before opening up the system to rinse
out or fill up the water circuit. Failure to comply with this instruction may cause accidental injury to maintenance personnel. If
a cleaning solution is used in the chilled water circuit, the chiller must be isolated from the water circuit to avoid all the
damage risks of the chiller and evaporator water pipes.
14.2
STARTING UP
Start up the unit by pressing the ON/OFF button. About 20 seconds pass from the moment in which the start-up request of
the unit is given to the moment in which the (first) compressor starts. Three hundred and sixty seconds will pass from the
last shut down to the next start-up of the same compressor.
Check the rotation direction of the compressors. If it is not the right one, invert two supply phases. Ensure that all the safety
and control equipment is functioning correctly. Control the temperature of the water coming out of the evaporator and
regulate the control setting if necessary. Control the oil level.
The oil type is POE.
ATTENTION before any operation, including closing the disconnector in the ON position and if the refrigerant gas is loaded
into the machine, an inspection of the machinery by external (mobile) leak detector is essential to exclude the presence of
any possible leak.
IMPORTANT during the verification process, which includes visual inspection of the machinery, it is essential to detect the
operation of the air movement fan located in the switchboard. It must be rotating even with the machine switched off but
powered: just move the disconnector switch to the ON position and detect the fan is running.
14.3
WARM UP OF THE PLANT
In order to keep all the machine components in good condition and to optimise their use, during the warm up it is necessary
to bring the circuit to the right temperature before releasing cooling or heating energy to the utilities.
The following steps must be followed for this to be carried out:
*
start up the machine
*
wait for the water temperature to reach the running temperature
*
start up the consumers
Follow the above mentioned procedure every time the plant is stopped long enough for the water temperature contained in it
to vary considerably.
CONTROL OF THE OIL CHARGE
14.4
All the compressors mounted on Trane CCUF units are factory charged with oil whose chemical characteristic of stability are
very good, so it is not necessary to change frequently the lubricant oil.
The scroll compressors are equipped with an oil sight glass from which you can control the level. In tandem or trio
performances, pay particular attention to oil level. Not perfectly leveled sight glasses between compressors in parallel, but
falling in the upper and lower limits, are considered normal.
In case of burns for the electrical motor or fault of the compressor, it is necessary to make a test to check the acidity of the
lubricant oil and, eventually, clean the circuit to reduce the acidity to correct values, mounting for instance an anti-acid filter
and changing the oil in the circuit.
Page 44
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