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7 - WATER CONNECTIONS

ATTENTION: Before carrying out any water connections 
install the water box purge plugs (one plug per water box 
in the lower section - supplied in the control box).

For size and position of the heat exchanger water inlet and 

outlet connections refer to the certified dimensional drawings 

supplied with the unit.

The water pipes must not transmit any radial or axial force 
to the heat exchangers nor any vibration. 

The water supply must be analysed and appropriate filtering, 

treatment, control devices, isolation and bleed valves and 
circuits built in, to prevent corrosion, fouling and deteriora-

tion of the pump fittings. Consult either a water treatment 
specialist or appropriate literature on the subject.

7.1 - Operating precautions

The water circuit should be designed to have the least num-
ber of elbows and horizontal pipe runs at different levels. 
Below the main points to be checked for the connection:

• 

Comply with the water inlet and outlet connections 

shown on the unit.

• 

Install manual or automatic air purge valves at all 

high points in the circuit(s).

• 

Use a pressure reducer to maintain pressure in the 

circuit(s) and install a relief valve as well as an expan-
sion tank.

• 

Install thermometers in both the entering and leaving 

water connections.

• 

Install drain connections at all low points to allow the 

whole circuit to be drained.

• 

Install stop valves, close to the entering and leaving 

water connections.

• 

Use flexible connections to reduce the transmission of 

vibrations.

• 

Insulate all pipework, after testing for leaks, both to 

reduce heat gains and to prevent condensation.

• 

Cover the insulation with a vapour barrier.

• 

Where there are particles in the fluid that could foul 
the heat exchanger, a screen filter should be installed 
ahead of the pump. The mesh size of the filter must be 

1.2 mm (see ‘Typical water circuit diagram’).

• 

Before the system start-up verify that the water 

circuits are connected to the appropriate heat 
exchangers (e.g. no reversal between evaporator and 
condenser).

• 

Do not introduce any significant static or dynamic 

pres-sure into the heat exchange circuit (with regard 
to the design operating pressures).

• 

Before any start-up verify that the heat exchange fluid 

is compatible with the materials and the water circuit 
coating.

• 

The use of different metals on hydraulic piping could 
generate eletrolytic pairs and consequently corrosion. 

Verify then, the need to install sacrificial anodes.

 

In case additives or other fluids than those recommen-
ded by Carrier are used, ensure that the fluids are not 

considered as a gas, and that they belong to class 2, as 

defined in directive 97/23/EC.

Carrier recommendations on heat exchange fluids:
• 

No NH

4+

 ammonium ions in the water, they are very 

detrimental for copper. This is one of the most impor-
tant factors for the operating life of copper piping. 
A content of several tenths of mg/l will badly corrode 
the copper over time.

• 

Cl

-

 Chloride ions are detrimental for copper with a risk 

of perforations by corrosion by puncture. If possible 
keep below 125 mg/l.

• 

SO

4

2-

 sulphate ions can cause perforating corrosion, if 

their content is above 30 mg/l.

• 

No fluoride ions (<0.1 mg/l)

• 

No Fe

2+

 and Fe

3+

 ions with non negligible levels of 

dis-solved oxygen must be present. Dissolved iron  
< 5 mg/l with dissolved oxygen < 5 mg/l.

• 

Dissolved silicon: silicon is an acid element of water 

and can also lead to corrosion risks. Content < 1 mg/l.

• 

Water hardness: > 0.5 mmol/l. Values between 1 and 

2.5 can be recommended. This will facilitate scale 
deposit that can limit corrosion of copper. Values that 
are too high can cause piping blockage over time. A 
total alkalimetric titre (TAC) below 100 is desirable.

• 

Dissolved oxygen: Any sudden change in water 

oxy-genation conditions must be avoided. It is as 
detrimen-tal to deoxygenate the water by mixing it 
with inert gas as it is to over-oxygenate it by mixing it 
with pure oxygen. The disturbance of the oxygenation 
conditions encourages destabilisation of copper 
hydroxides and enlargement of particles.

• 

Electric conductivity 10-600 μS/cm

• 

pH: Ideal case pH neutral at 20-25 °C

 

7.5 < pH < 9.

If the water circuit must be emptied for longer than one 
month, the complete circuit must be placed under nitrogen 
charge to avoid any risk of corrosion by differential aeration.

ATTENTION: Filling, completing and draining the water 
circuit charge must be done by qualified personnel, using the 
air purges and materials that are suitable for the products. 

Charging and removing heat exchange fluids should be 
done with devices that must be included on the water 
circuit by the installer. Never use the unit heat exchangers 
to add heat exchange fluid.

Summary of Contents for Aquaforce 30XA Series

Page 1: ...INSTALLATION OPERATION AND MAINTENANCE INSTRUCTIONS Air Cooled Screw Chillers 30XA A Nominal cooling capacity 267 1682 kW 50 Hz Unit with options 23A 258 and 279 Original document...

Page 2: ...XA 1702 module 1 2 MCHE heat exchanger standard and 30XA 1702 module 1 2 Cu Al heat exchanger option 254 255 15 3 11 30XA 1702 module 2 2 MCHE heat exchanger standard and 30XA 1702 module 2 2 Cu Al he...

Page 3: ...control 42 9 8 Heat reclaim operation 42 9 9 Condenser pump selection 42 9 10 Frost protection 43 10 FANS WITH AVAILABLE PRESSURE OPTION 10 43 11 MAJOR SYSTEM COMPONENTS AND OPERATION DATA 43 11 1 Dir...

Page 4: ...e unit The units can also be lifted with slings using only the designated lifting points marked on the unit These units are not designed to be lifted from above Use slings with the correct capacity an...

Page 5: ...d documentation supplied with the products These units are intended to be stored and operated in an environment where the ambient temperature must be not less than the lowest allowable temperature ind...

Page 6: ...option 231 are equipped with capacitor batteries with a discharge time of five 5 minutes after disconnecting the power After disconnecting the power to the control box wait five minutes before opening...

Page 7: ...ny spills from the skin with soap and water If liquid refrigerant enters the eyes immediately and abundantly flush the eyes with water and consult a doctor The accidental releases of the refrigerant d...

Page 8: ...replacement Consult the list of replacement parts that corresponds to the specification of the original equipment Do not drain water circuits containing industrial brines without informing the technic...

Page 9: ...ever push or lever on any of the enclosure panels of the unit Only the base of the unit frame is designed to withstand such stresses If a unit includes a hydronic module options 116B C F G the hydroni...

Page 10: ...nit For options 5 6 100A 100C 107 refer to the certified drawing Air outlet do not obstruct Power supply and control connection Control circuit connection for option 158 NOTES Drawings are not contrac...

Page 11: ...ions 5 6 100A 100C 107 refer to the certified drawing Air outlet do not obstruct Power supply and control connection Control circuit connection for option 158 NOTES Drawings are not contractually bind...

Page 12: ...ons 5 6 100A 100C 107 refer to the certified drawing Air outlet do not obstruct Power supply and control connection Control circuit connection for option 158 NOTES Drawings are not contractually bindi...

Page 13: ...C NOTES Drawings are not contractually binding Before designing an installation consult the certified dimensional drawings available on request For the positioning of the fixing points weight distrib...

Page 14: ...ler installation and 3 13 Distance to the wall of this document to determine the space required 3 9 30XA 1402 1502 module 2 2 MCHE heat exchanger standard and 30XA 1402 1502 module 2 2 Cu Al heat exch...

Page 15: ...or option 158 NOTES Drawings are not contractually binding Before designing an installation consult the certified dimensional drawings available on request For the positioning of the fixing points wei...

Page 16: ...t your Carrier distributor to evaluate the various possible arrangements In certain situations an accessory supplied loose at the time of purchase can be added 3 13 Distance to the wall To ensure corr...

Page 17: ...8 20 8 20 8 23 5 23 5 23 5 23 5 23 5 23 5 Capacity control Touch Pilot electronic expansion valve EXV Minimum capacity 15 15 15 15 15 15 15 15 15 15 15 15 15 Condensers All aluminium microchannel heat...

Page 18: ...D kg 63 teqCO2 90 1 Oil charge Circuit A l 27 6 27 6 27 6 27 6 27 6 36 36 27 6 27 6 27 6 Circuit B l 27 6 27 6 27 6 36 36 36 36 27 6 27 6 23 5 Circuit C l 27 6 27 6 27 6 Circuit D l 23 5 Capacity con...

Page 19: ...5 23 5 23 5 23 5 23 5 27 6 Circuit C l Circuit D l Capacity control Touch Pilot electronic expansion valve EXV Minimum capacity 15 15 15 15 15 15 15 15 15 15 15 15 Condensers Copper aluminium coil Fa...

Page 20: ...screw compressors 50 r s Circuit A 1 1 1 1 1 1 1 1 Circuit B 1 1 1 1 1 1 1 1 Circuit C 1 1 1 Circuit D 1 Oil charge Circuit A l 27 6 27 6 36 36 36 27 6 27 6 27 6 Circuit B l 27 6 36 36 36 36 27 6 27...

Page 21: ...3 1039 1103 1118 1125 1143 Cosine Phi maximum 0 86 0 87 0 86 0 87 0 87 0 87 0 86 0 87 0 87 Cosine Phi nominal 0 85 0 85 0 85 0 86 0 87 0 87 0 86 0 85 0 85 Maximum power input Circuit 1 kW 359 420 182...

Page 22: ...60 Circuit 2 A 772 772 772 772 587 587 760 Option 81 A 1031 1047 1113 1128 1122 1133 Cosine Phi maximum 0 85 0 85 0 86 0 86 0 87 0 87 0 87 0 86 0 86 0 86 Cosine Phi nominal 0 84 0 84 0 84 0 84 0 84 0...

Page 23: ...772 772 845 865 761 Circuit 2 A 772 772 772 772 587 587 761 Option 81 A 1023 1039 1103 1118 1125 1143 Cosine Phi maximum 0 87 0 86 0 87 0 87 0 87 0 86 0 87 0 87 Cosine Phi nominal 0 85 0 85 0 86 0 87...

Page 24: ...t 1 A 860 587 587 772 772 845 860 760 Circuit 2 A 772 772 772 772 587 587 760 Option 81 A 1031 1047 1113 1128 1122 1133 Cosine Phi maximum 0 86 0 86 0 87 0 87 0 87 0 86 0 86 0 86 Cosine Phi nominal 0...

Page 25: ...characteristics used for the operation of the machines 1 Environment Environment as classified in EN 60364 corresponds to IEC 60364 Outdoor installation Ambient temperature range from 20 C to 55 C Alt...

Page 26: ...at full load and nominal voltage 86 1 88 6 88 6 90 1 91 3 91 3 1 Nominal efficiency at 75 rated load and nominal voltage 86 3 88 5 88 5 89 7 91 4 91 4 1 Nominal efficiency at 50 rated load and nominal...

Page 27: ...lator switch are designed for the number and type of wires listed in column 2 of the table on the next page The calculations are based on the maximum machine current see electrical data tables The cal...

Page 28: ...LPE Cu 904 2 x 240 2 x 185 205 XLPE Cu Not compatible 902 2 x 240 2 x 185 205 XLPE Cu Not compatible 1002 4 x 300 2 x 240 205 XLPE Cu 4 x 185 320 XLPE Cu Circuits A and B C common routing 1112 2 x 240...

Page 29: ...culated as shown in the diagram For minimum chilled water flow rate 1 Evaporator 2 Recirculation 6 3 Maximum chilled water flow units without hydronic module The maximum chilled water flow is shown in...

Page 30: ...buffer tank Bad Bad Good Good 6 6 Maximum system water volume Units with hydronic module incorporate an expansion tank that limits the water volume The table below gives the maximum loop volume for pu...

Page 31: ...1 702 2 752 3 802 4 854 852 5 904 902 6 1002 7 1112 8 1212 9 1312 10 1382 11 1402 12 1502 13 1702 Water flow rate l s Pressure drop kPa 1 2 4 5 6 9 8 10 3 7 11 13 12 100 100 10 10 10 100 10 252 302 35...

Page 32: ...ible with the materials and the water circuit coating The use of different metals on hydraulic piping could generate eletrolytic pairs and consequently corrosion Verify then the need to install sacrif...

Page 33: ...tions 5 6 and 100A Nominal diameter in 5 6 6 6 6 6 8 5 8 5 6 6 Actual outside diameter mm 141 168 3 168 3 168 3 168 3 168 3 219 1 141 3 219 1 141 3 168 3 168 3 Option 100C Nominal diameter in 6 8 Actu...

Page 34: ...re of 10 K below the lowest temperature likely to occur at the installation site If the unit is not used for an extended period it is recommended to drain it and as a safety precaution add ethylene gl...

Page 35: ...required kPa abs Water flow rate l s 7 7 2 Net positive suction head NPSH required hydronic module option Size the hydronic circuit to ensure a net positive suction head that is higher than or equal...

Page 36: ...separator 5 Principal electronic expansion valve EXV 6 Pressure and temperature measurement to calculate the sub cooling upstream of the pump 7 Motorised two way bypass valve 8 Free cooling expansion...

Page 37: ...nit The sealing joints are in the control box The temperature sensors and the condenser flow switch are wired and fixed in the machine They must be installed as described in the chapter Condenser wate...

Page 38: ...eight distribution and centre of gravity coordinates please refer to the dimensional drawings If the installation includes several units or if this these is are close to walls please refer to chapters...

Page 39: ...weight distribution and centre of gravity coordinates please refer to the dimensional drawings If the installation includes several units or if this these is are close to walls please refer to chapte...

Page 40: ...and centre of gravity coordinates please refer to the dimensional drawings If the installation includes several units or if this these is are close to walls please refer to chapters 3 11 Multiple chi...

Page 41: ...enser Legend 1 Heat reclaim condenser 2 Entering water temperature sensor supplied 3 Leaving water temperature sensor supplied 4 Condenser water flow switch supplied 5 Three way valve not supplied 9 4...

Page 42: ...om heat exchange at the air condenser to heat exchange at the water condenser and vice versa is ensured by motorised two way valves located upstream of the air and water condensers Setpoint C Condense...

Page 43: ...eral Monitoring during operation re qualification re testing and re testing dispensation Follow the regulations on monitoring pressurised equipment It is normally required that the user or operator se...

Page 44: ...oling of the rest of the flow that penetrates the evaporator via the prin cipal EXV This permits increasing the cooling capacity of the system as well as its efficiency 11 3 High pressure safety switc...

Page 45: ...on the compressor economiser discharge and suction lines ATTENTION The compressor suction valve must be used without pressure difference at the terminals If there is a pressure difference leak tightne...

Page 46: ...702 904 1 1 1 4 1 5 1 2 1 3 1 6 2 3 2 6 2 2 2 5 2 1 2 4 1 1 1 5 1 6 1 2 1 3 1 7 1 4 1 8 2 6 2 2 2 5 2 1 2 4 2 3 30XA 1112 1 1 1 5 1 6 1 2 1 3 1 7 1 4 1 8 2 7 2 5 2 8 2 4 2 7 2 5 2 3 2 2 2 6 2 1 2 6 3...

Page 47: ...pplementary water outlet temperature sensor kit to be field installed allowing master slave operation of two units connected in parallel Optimised operation of two chillers connected in parallel with...

Page 48: ...insulation of the evaporator entering leaving refrigerant lines with flexible anti UV insulant Prevents condensation on the evaporator entering leaving refrigerant lines 252 1702 Low noise level 257 S...

Page 49: ...ntion on the refrigerant circuit handling refrigerant Changing of parameters set at the factory application change Removal or dismantling of the HVAC unit Any intervention due to a missed established...

Page 50: ...l 6 1 Torque application to tighten the lug 2 Avoid contact between the two nuts 3 Lug tightening nut 4 Flat lug 5 Counter nut 6 Terminal tightening nut 7 Isolator 13 5 Tightening torques for the main...

Page 51: ...the coil surface or wedged between the chassis and the supports Provide personal protection equipment including safety glasses and or a face mask waterproof clothing and safety gloves It is recommend...

Page 52: ...sure drop across the filter can be determined by measuring the pressure at the filter service port and the oil pressure port The difference in these two pressures will be the pressure drop across the...

Page 53: ...g has been sized and installed properly Unit ground wire has been connected Electrical circuit protection has been sized and installed properly All terminals are tight All chilled water valves are ope...

Page 54: ...he chiller is not switched on until corrective measures have been taken Check cooler water loop Water loop volume litres Calculated volume litres 3 25 litres nominal kW capacity for air conditioning 6...

Page 55: ......

Page 56: ...es order No 13452 76 12 2014 Manufacturer Carrier SCS Montluel France Manufacturer reserves the right to change any product specifications without notice Printed in the European Union www eurovent cer...

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