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Trane RAUS 040, Installation Operation & Maintenance

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Trane RAUS 040 Installation Operation & Maintenance Download Page 21

 

 

 

Page 21 

 

 

 

INDEX 

 

INDEX 

RC 

CARTER HEATER 

 

VEI 

MECHANICAL EXPANSION VALVE 

C 

COMPRESSOR 

 

VS 

SIGHT GLASS 

PA 

HP PRESSURE SWITCH 

 

KA 

HP TRANSDUCER 

PS 

SERVICE VALVE 

 

FE 

FILTER 

PFV24  PRESSURE SWITCH TO SWITCH OFF ONE FAN IN 

 

 

 

R 

SHUT OFF VALVE (OPTION) 

VNR 

CHECK VALVE 

 

Rliq 

LIQUID RECEIVER 

BCE 

EVAP.-COND. COIL 

 

V2-

 

CIRCUIT VALVE 

V 

FAN 

 

KB 

LP TRANSDUCER 

PB 

LP PRESSURE SWITCH 

 

VA 

LIQUID SAFETY VALVE (OPTION) 

Tas 

SUCTION TEMPERATURE PROBE 

 

AA 

ACCUMULATOR 

VIC 

CYCLE INVERSION VALVE 

 

TSC 

 

 

COMPR. DISCHARGE TEMPERATURE (with -15°C 

h t 

  kit) 

VEE 

ELECTRONIC EXPANSION VALVE 

 

KD 

ELECTRONIC EXPANSION VALVE 

 

REFRIGERANT 410a 

Liquid receiver in chiller 

mode 

Liquid receiver in heat 

pump mode 

CONNECTION BY THE CUSTOMER 

CONNECTION BY THE CUSTOMER 

RAUX 040-140 

Summary of Contents for RAUS 040

Page 1: ... condensing units Air cooled chillers and heat pumps condensing units with scroll compressors RAUS 040 150 Cooling capacity 16 5 52 2 kW RAUX 040 140 Cooling capacity 15 2 48 2 kW Heating capacity 17 1 53 7 kW July 2021 CG SVX052A GB Original instructions ...

Page 2: ...OW TO SIZE REFRIGERANT LINES 11 8 LIQUID RECEIVER 19 9 REMOTE TERMINALS CONTROL AND EXPANSION VALVE 22 10 ELECTRICAL PANEL 23 11 OPERATOR RESPONSABILITIES 24 12 START UP PRELIMINARY PROCEDURES 24 13 CHECK LIST MANDATORY OPERATION CONTROL BEFORE START UP 25 14 MAINTENANCE 29 15 RECOMMENDED SPARE PARTS 32 16 TROUBLESHOOTING 33 17 IMPROPER USES 35 ...

Page 3: ...on observance of the above mentioned rules and of all the indications written on this manual will cause the immediate loss of warranty getting free TRANE from any responsibility for the unit and any damages to persons or things 1 3 RECEIVING THE UNIT On receiving the unit it is up to the customer to check that there is no obvious damage or pieces missing If this is so an immediate complaint must b...

Page 4: ...arry out all the maintenance operations provided for by this manual regularly wear a protective helmet before entering inside the unit before opening a machine panel make sure that it is firmly connected by means of a hinge do not touch the air condensation batteries without having first put on protective gloves do not remove the protections to the moving parts while the unit is running before res...

Page 5: ...tained in the refrigerant circuit into the environment when replacing the electronic card always use appropriate equipment extractor anti static bracelet etc if a compressor the condensation batteries or any other heavy part is to be replaced make sure that the lifting equipment matches the weight to be lifted if the unit has an independent compressor compartment do not open the ventilator compart...

Page 6: ...ation can damage electronic components 3 2 OPERATING LIMITS Unit operation is permitted within the limits indicated in the diagram provided in 3 3 CAUTION The operation outside the limits specified may cause the activation of the protections and disrupt the operation of the unit and in extreme cases damage the unit In case of doubt consult the factory These operating limits apply to unit operating...

Page 7: ...Page 7 RAUX 040 140 HEATING MODE RAUX 040 140 COOLING MODE OAT Outdoor Air Temperature C ET Evaporating Temperature C OAT Outdoor Air Temperature C CT Condensing Temperature C kit 10 C Glycol ...

Page 8: ...the transmission of vibrations to the supporting structures fit shock absorbers in every fastening point Rubber shock absorbers are recommended for units installed on the ground spring shock absorbers for units installed on roofs Open spaces around the unit must be provided to allow for the passage of necessary airflow and to allow normal maintenance to be carried out IMPORTANT Make sure that duri...

Page 9: ... units with horizontal flow fans that such winds blow in front of the unit fans discharge side In case of unit with vertical flow fans it is strictly necessary to avoid installations where the dominant winds could cause rejected hot air to come back to the condensing coils 4 4 PRECAUTIONS AGAINST DIRECT SUNSHINE Direct solar radiation can raise the temperature of condensation until it causes the u...

Page 10: ...cable of a section which is appropriate to the machine absorption The switch and the fuses like all the power connections must comply with the regulations in force 6 2 IMBALANCE BETWEEN THE SUPPLY TENSION PHASES Do not run the electrical motors when the voltage unbalance between the phases is more than 2 Use the following formula to check Imbalance Vx Vave x 100 Vave Vave V1 V2 V3 3 Vx phase with ...

Page 11: ...pipes and the pressure drop depend on the diameter Although it is advisable to limit as much as possible the pressure drop to reduce the loss of cooling capacity is important to ensure a velocity in the pipe to allow the oil carryover Generally the dimensioning of the suction line is made in order to maintain a speed higher than 4 m s to the minimum load minimum step of capacity and lower than 20 ...

Page 12: ...temperature drops C on the suction and discharge lines Losses of load C Power output Power input 0 100 100 1 C suction 95 7 103 5 1 C discharge 98 4 103 5 2 C suction 92 2 106 6 2 C discharge 96 8 106 6 High pressure drops caused by considerable lengths create another type of problem on the liquid line known as gas flashing It consists in the evaporation of part of the refrigerant due to the heat ...

Page 13: ...ngths are shown in the table 2 and shall be considered effective for fully open valves Table 2 Equivalent lengths in meters for concentrated drops The table1 is referred to a condensation temperature of 40 C In case of different condensation temperatures the following correcting values shall be applied to the cooling capacity Cond Temp C 20 30 40 50 K suction line 1 18 1 1 1 0 91 K discharge line ...

Page 14: ... The cooling capacity delivered by the line with Δext 28 mm corresponding to pressure drops of 0 02 k m is therefore P 29 7 x1 11 32 97 kW In conclusion the data we need to use the formula 1 are the following ΔT 0 016x60 0 96 K ΔTtab 0 02 K Le 1m Leff 60m P 32 97 kW As a consequence The above value represents the cooling capacity for a line with Δext 28mm at Tas 5 C e Tc 50 C and with a correspond...

Page 15: ... in case of different temperature values of the liquid line the capacities must be adjusted according to the following factors Liquid temperature C 30 40 50 Correction factor 1 08 0 91 0 82 Table 3 a Correction factors for different liquid temperature Table 4 Minimum capacity kW ensuring the oil flowing in vertical sections of the discharge line R410a In this case also the cooling capacity shown i...

Page 16: ... a single line dimensioned in accordance to the maximum cooling capacity Between the two vertical sections a sump is realized The sump is sized to guarantee that at minimum loads it will be filled with oil closing the entrance to the line B The sump however must not contain excessive amounts of oil but it must have a minimum volumetric capacity When the cooling capacity grows the greater flow crea...

Page 17: ...ed using check valves and making oil taps if the condenser is mounted at a higher level than the compressor On the liquid line it is important to avoid that non liquid refrigerant reaches the thermostatic valve This purpose is achieved by giving to the fluid a high subcooling in the condenser but a proper sized liquid receiver shall be installed upstream from the line in the case of high lengths o...

Page 18: ...e Temperature C 20 0 25 50 75 100 125 Expansion mm mt 0 0 4 0 7 1 1 1 5 1 9 2 3 These special couplings or U shaped or L shaped sections used to compensate the pipe expansion can be sized according to the following sketch Since this type of components may cause significant pressure drops their use must be carefully evaluated Supports shall be installed to support the pipes weight and shall be spac...

Page 19: ...k as condenser or as evaporator in accordance with the cycle The liquid receivers are installed on the refrigerant circuit and allow to store the charge difference between the two cycles The placement of the liquid receiver shall be evaluated depending on the capacity of the heat exchangers of the plant and those installed on board of the unit For example Capacity of the heat exchanger on board 10...

Page 20: ...S SIGHT GLASS PS SERVICE VALVE KA HP TRANSDUCER KB LP TRANSDUCER F FILTER BCE EVAPAPORATING R SHUT OFF VALVE OPTION V FAN Rliq LIQUID RECEIVER PB LP PRESSURE VL SOLENOID VALVE Tair AIR TEMPERATURE PROBE PFV24 PRESSURE SWITCH FOR THE ACTIVATION DEACTIVATION OF ONE FAN STANDARD FOR SIZES 125 128 133 136 145 150 CONNECTION BY THE CUSTOMER REFRIGERANT 410a RAUS 040 150 ...

Page 21: ...IQUID RECEIVER BCE EVAP COND COIL V2 CIRCUIT VALVE V FAN KB LP TRANSDUCER PB LP PRESSURE SWITCH VA LIQUID SAFETY VALVE OPTION Tas SUCTION TEMPERATURE PROBE AA ACCUMULATOR VIC CYCLE INVERSION VALVE TSC COMPR DISCHARGE TEMPERATURE with 15 C h t kit VEE ELECTRONIC EXPANSION VALVE KD ELECTRONIC EXPANSION VALVE REFRIGERANT 410a Liquid receiver in chiller mode Liquid receiver in heat pump mode CONNECTIO...

Page 22: ...receiver shall be placed in a location that ensure the proper filling during the operation in chiller mode and the proper emptiness during heat pump mode IMPORTANT The choice of the liquid receiver capacity and its placing is the responsibility of the designer of the plant 9 REMOTE TERMINALS CONTROL AND EXPANSION VALVE The units can be connected to hydronics or direct expansion terminals In both c...

Page 23: ...auxiliary transformer control circuit 230 24V It requires no additional power cable for the control equipment The circuit also an electric resistance installed in the compressor in order to keep warm the oil and thus avoid the transmigration of the refrigerant in its interior Obviously the operation of the electrical resistors is ensured as long as the unit is power supplied The unit is equipped w...

Page 24: ... CHECK 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 SEALS CONTROL Units are shipped void of refrigerant pressed with nitrogen and with pipes plugged...

Page 25: ...T OR THE HYDRAULIC CIRCUIT OR THE ELECTRICAL PANEL OR CHANGES TO THE UNIT OPERATING PARAMETERS MADE BY A THIRD PERSON WITHOUT A WRITTEN AUTHORIZATION ISSUED BY TRANE THE UNIT SHALL BE CONFORM TO TRANE WIRING DIAGRAMS AND TECHNICAL DOCUMENTATION IN CASE OF RELEVANT DIFFERENCE BETWEEN THE UNIT AND TRANE STANDARD CONFIGURATION PLEASE CONTACT TRANE WARNING PLEASE BE AWARE THAT RELEVANT DAMAGES CAUSED ...

Page 26: ... BEFORE THE START UP 16 AN ELECTRONIC SUPERVISOR OR ANY ADDITIONAL CONTROLLER HAS BEEN INSTALLED 17 THE CONNECTION WIRES ARE SHIELDED 18 REMOTE CONTROL DEVICES OR INTERFACES ARE CONNECTED TO THE ELECTRICAL PANEL IN CONFORMITY WITH TRANE WIRING DIAGRAMS 19 ELECTRONIC DEVICES ARE INTACT AND DON T DISPLAY ANY DAMAGE 20 THE ELECTRICAL ABSORPTION IS STANDARD REFRIGERANT CIRCUIT COMPLIANCE YES NO 21 ALL...

Page 27: ...lues may mean an excess of charge After intervention on the charge it is appropriate to check that the unit runs within the declared 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...

Page 28: ...nsumption and possible damage to the compressor The symptoms of a low refrigerant charge are Low evaporation pressure High value of superheating Low value of subcooling In this case add refrigerant R410A The system is provided with a charging port between the expansion valve and the evaporator Charge refrigerant until conditions return to work normal Remember to replace the cap closing the valve a...

Page 29: ...ns of the compressor It is recommended to check the value of the vibration immediately after starting and periodically on an annual basis Compressor Electrical Connections It is very important that all the compressors are wired correctly for proper rotation These compressors will not tolerate reverse rotation Verify correct rotation phasing using a rotation meter If wired incorrectly the compresso...

Page 30: ...ing with cleansers or detergents is strongly discouraged due to the all aluminum construction straight water should prove sufficient if not please contact TRANE Any breach in the tubes can result in refrigerant leaks IMPORTANT Only in extreme cases should any type of chemical cleaner or detergent be used on microchannel coils If it becomes absolutely necessary because water alone did not clean the...

Page 31: ...eck through the sight glass coolant flow Full Indicator X Check the pressure drop of the filter drier X Carry out the analysis of the vibrations of the compressor X Carry out the analysis of the acidity of the oil of the compressor 5 X Condensing section Cleaning the condenser coils 4 X Check that the fans are tightened X Notes 1 The monthly activities include all those weekly 2 The annual activit...

Page 32: ...ght glass 1 per type fans and engines 1 per type 2 YEAR COMPONENTS QUANTITY fuses all filter dryers all solenoid valves all electronic expansion valves all pressure switches all gas gauges all contactors and relays all thermal protectors all carter electric heaters all 4 way valve 1 per type check valve 1 per type sight glass 1 per type fans and engines 1 per type electrical components all compres...

Page 33: ...e in the circuit Make sure that working conditions are within the limits of operation Loss of coolant see section G C The compressor starts up and stops repeatedly x x s Intervention of the minimum See point E x x s Compressor contactor defective Check and replace if necessary x x u Calibration values of the set point or differential Modify them as reported in the in the tables x x s Lack of coola...

Page 34: ...and the continuity of the coil x x s Lack of output voltage from the control fan speed Check the contacts replace if necessary x x s Thermal protection inside the fan Check the condition of the fan and the air temperature during operation of the unit x x s Fan motor faulty Check and replace x x s Loose electrical connections Check and replace G Lack of gas x x s Loss in the refrigerant circuit Che...

Page 35: ...The panel vibrate Fasten properly O The defrosting cycle is never activated x s 4 way reversing valve defective Check the power supply and the coil of the valve and replace the valve x s The defrost thermostat is worn out or has an incorrect calibration value Check and replace if defective or change the calibration value P The unit does not start x x s Phases of the supply network reversed Invert ...

Page 36: ...portfolio of heating ventilating and air conditioning systems and controls services parts and supply For more information please visit trane eu or tranetechnologies com Trane has a policy of continuous product and product data improvement and reserves the right to change design and specifications without notice 2021 Trane CG SVX052A GB_0721 New ...

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