Start-Up - Trane CGWF SE Installation Operation & Maintenance

13

START-UP

13.1 PRELIMINARY CONTROLS
Before starting up the equipment, check that all the operations described in the paragraph "CHECK LIST – MANDATORY
OPERATION CONTROL BEFORE START UP" have been carried out correctly.
Check that all the mechanical and electrical 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 unit.
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 unitry connected to
the unit.
WARNING! 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.
13.2 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.
13.3 WARM UP OF THE PLANT
In order to keep all the unit components in good condition and to optimize 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 unit
* 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.
13.4 CONTROL OF THE OIL CHARGE
All the compressors mounted on Trane 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 antiacid filter
and changing the oil in the circuit.
13.5 START UP PROCEDURE
1) With the switch closed, open the electrical panel and exclude compressor (refer to the wiring diagram on the unit).
Close the panel, set switch to "ON" (to give power to the unit).
2) Wait for the start of the microprocessor and control. Make sure that the temperature of the oil is hot enough. The oil
temperature must be at least 5°C higher than the saturation temperature of the refrigerant inside the compressor.
3) Place the unit in the "ON" and wait until the unit is indicated on the display-On.
4) Turn on the pumps (at max speed if with inverter).
5) Verify that the loss of load of the evaporator is equal to that of the project and correct if necessary. The pressure drop on
the evaporator must be read on the service valves installed on the evaporator piping as a standard. Do not measure the
load losses in points where any valves and / or filters are interposed.
6) Check for air in cleaning filters, and then drain the system.
7) Return the pump to the factory setting.
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