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Start-up 

 

Preliminary controls 

Before  starting  up  the  equipment  it  is  very  important  to  check  that  all  the  operations  described  in  the  paragraph 
“SETTING FOR 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. 

 

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 fans and rotary 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. 
 
 

Warm up of the plant for air-to-water units  

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 energy to the utilities. 
The following steps must be followed for this to be carried out: 

 start up the machine 

 wait for the water in 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 rise. 

 

 

Control of the oil charge 

 

All units Trane have compressors loaded with oil at 
the factory. The scroll compressors are equipped with 
an oil sight glass and from which can check the level. 
The exact level must be between the two notches that 
indicate the minimum and maximum level. Close to oil 
sight glass on the compressor there is a connection 
for the oil drain connection for the eventual charge 
refilling. For topping up oil, there is attack Schrader 
from 1/4 ". To operate the addition of oil, it is 
necessary to discharge the refrigerant, recovering in 
the bottles, subsequently perform the vacuum to a 
pressure of approximately 6 Pa in order to eliminate 
any trace of moisture from the circuit. Then recharge 
refrigerant in the unit with a small amount of 
refrigerant and top up the oil from the special 
connection for filling. 
Add oil until the indicator sight is not flat in the 
maximum and minimum limits specified by the 
respective notches. At this point recharge the amount 
of the refrigerant discharged in accordance with the 
foregoing methods. Restart the compressor. Run for 
20 minutes at full load and check the oil level. 

 
 

 

 
 

Summary of Contents for CGA Series

Page 1: ...Scroll chillers and heat pumps Models CGA CXA May 2015 CG SVX031A GB Original instructions Installation Operation Maintenance ...

Page 2: ...Overview 3 Reference and certifications 4 Installation 8 Electrical connections 9 Hydraulic diagrams 12 Tank mounting instructions 14 Start up procedures 17 Start up 20 Maintenance 23 Recommended spare parts 23 ...

Page 3: ... F The warranty is subject to regular maintenance of the unit which is appropriately indicated in the unit log book locat ed inside the electrical panel G Warranty automatically ends in case of payments not fulfilled non performance of the contract and even if the units show tampering without TRANE written approvals Receiving the unit On receiving the unit it is up to the customer to check that th...

Page 4: ... with the indications in this manual and with the national regulations in force Operator A person authorised by the owner to carry out all the operations of regulation and control on the Trane unit which are specifically mentioned in this manual He or she should keep to actions described in the manual and limit his or her action to what is explicitly allowed Technician A person who is directly aut...

Page 5: ...se with fresh water the contaminated parts of the skin The refrigerant in liquid stage in contact with wet clothes causes freezing and adherence to the skin In this case it is neces sary to take off the contaminated clothes to avoid freezing Contact a doctor in case of irritation of the contaminated parts Risks for contact with the eyes Vapors don t take any effect Splashes or sprinklers can cause...

Page 6: ...d the possible spillage of refrigerating fluid outside eliminate any fluid loss inside or outside the unit collect the discharge liquid and clean up any possible oil leakage periodically clean the compressor casing of the accumulated dirt deposits do not keep inflammable liquids near the unit do not dispose of the refrigerant fluid and the lubricating oil in the environment welding should only be ...

Page 7: ...to be moved after a year of being in the site or if it has to be dismantled contact Trane Manual alarm reset If there is an alarm the unit must not be manually reset before having located and eliminated the cause of the fault Repeated manual resets may cause the guarantee to be void Operating range The operating ranges are indicated on the plate placed on the unit ...

Page 8: ...nt vibration bolts Precautions for dominant winds Avoid obstacles on suction and discharge sides of the units Respect the safety distances as shown on the units dimensional drawings In case of presence of dominant winds in the installation area it is strictly necessary to avoid for units with horizontal flow fans that such winds blow in front of the unit fans discharge side In case of unit with ve...

Page 9: ...resents frequency components higher than the mains frequency These components are called harmonics in case of power supply at 50 Hz is called the fundamental harmonic component at 50 Hz the second harmonic is the component to 100 Hz the third harmonic is the component at 150 Hz and so on in the case of power 60Hz to the fundamental component is at 60Hz the second har monic is 120Hz 180Hz in the th...

Page 10: ...essure gauges of adequate scale in and out of the unit 2 Two shock absorbing joints inlet and out of the unit 3 One shut off valve normal one inlet 4 One setting valve in outlet 5 Two thermometers inlet and outlet 6 One circulation pump 7 One safety valve on the water buffer if not equipped in the unit 8 One automatic air vent valve if not equipped in the unit 9 One expansion vessel if not equippe...

Page 11: ...nd the utility Automatic filling unit Assures the water pressure in the plant is maintained at least 1 5 bar automatically resetting it when necessary Safety valve Takes care of opening the unit in atmosphere if the pressure exceeds the calibration value Expansion tank if not equipped in the unit and one in addition depending on the volume of water in the plant Takes care of compensating small wat...

Page 12: ...Hydraulic diagrams ...

Page 13: ......

Page 14: ......

Page 15: ...lifting phase positioning the drain path pipes as shown in figure below C Position the unit in the group with water tank lining up the holes of the upper bracket of the tank with the drilling of the underside of the foot making sure to route the drain path pipes inside the holes on the base of the hydronic kit ...

Page 16: ...D Carry out by coupling bolts E Connect the inlet of the water tank with the outlet of the unit ...

Page 17: ...Valid only for size CGA CXA 040 D Mounting the two inspection panels of the water tank Valid only for size CGA CXA 040 Valid for sizes from CGA CXA 060 115 ...

Page 18: ...tion 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...

Page 19: ...clared values with unit steadily running on a full charge measure the temperature of the suction line downstream of the thermostatic valve bulb read the balance pressure to the evaporator on the low pressure manometer and the corresponding saturation temperature Overheating is equal to the difference between the temperatures measured in this way Then measure the temperature of the liquid line comi...

Page 20: ...Charge in vapour phase ...

Page 21: ...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 energy to the utilities The following steps must be followed for this to be carried out start up the machine wait for the water in temperature to reach the running temperature start up the consumers Follow the above me...

Page 22: ...e hydraulic circuit water filling monthly Control of electric absorption fan motors and compressor monthly Control of power supply and auxiliary power monthly Control of refrigerant charge through liquid sight glass if available monthly Control of the state of the carter electric heaters monthly Carrying out tightening of all the electrical connections monthly Coil cleaning monthly Control of the ...

Page 23: ...pare parts Following is a list of the recommended parts for several years of operation Trane is at your disposal to recommend a personalised list of accessories according to the commissioned order including the part number of the equipment 1 year Components Quantity fuses all filter dryers all solenoid valves 1 per type thermostatic valves 1 per type pressostats 1 per type pressure gauges 1 per ty...

Page 24: ...ficient environments Trane offers a broad portfolio of ad vanced controls and HVAC systems comprehensive building services and parts For more information visit www Trane com Trane has a policy of continuous product and product data improvement and reserves the right to change design and specifications without notice 2015 Trane All rights reserved CG SVX031A GB May 2015 ...

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