In certain cases the globe stops are installed on ball valves. These valves are factory-supplied lead-sealed in the open position. This system permits isolating and removing the globe stop for checking and replacing. The globe stops are designed and installed to ensure protection against fire risk. Removing the globe stops is only permitted if the fire risk is fully controlled and the responsibility of the user. All factory-installed globe valves are lead-sealed to prevent any calibration change. If the globe valves are installed on a reversing valve (change-over), this is equipped with a globe valve on each of the two outlets. Only one of the two glove valves is in operation, the other one is isolated. Never leave the reversing valve in the intermediate position, i.e. with both ways open (locate the control element in the stop position). If a globe stop is removed for checking or replacement please ensure that there is always an active globe stop on each of the reversing valves installed in the unit. Provide a drain in the discharge circuit, close to each valve, to avoid an accumulation of condensate or rain water. The safety valves must be connected to discharge pipes. These pipes must be installed in a way that ensures that people and property are not exposed to refrigerant leaks. These fluids may be diffused in the air, but far away from any building air intake, or they must be discharged in a quantity that is appropriate for a suitably absorbing environment. Periodic check of the globe valves: See paragraph Maintenance safety considerations. Accumulation of refrigerant in an enclosed space can displace oxygen and cause asphyxiation or explosions. Inhalation of high concentrations of vapour is harmful and may cause heart irregularities, unconsciousness, or death. Vapour is heavier than air and reduces the amount of oxygen available for breathing. These products cause eye and skin irritation. Decomposition products are hazardous. 1.2 - Equipment and components under pressure These products incorporate equipment or components under pressure, manufactured by Carrier or other manufacturers. We recommend that you consult your appropriate national trade association or the owner of the equipment or components under pressure (declaration, re-qualification, retesting, etc.). The characteristics of this equipment/these components are given on the nameplate or in the required documentation, supplied with the products. Do not introduce high static and dynamic pressure compared with the existing operating pressures - either service or test pressures in the refrigerant circuit or in the heat transfer circuit, especially: - limiting the elevation of the condensers or evaporators - taking the circulating pumps into consideration.

1.3 - Maintenance safety considerations Engineers working on the electric or refrigeration components must be authorized and fully qualified to do so (electricians trained and qualified in accordance with IEC 60364 Classification BA4). All refrigerant circuit repairs must be carried out by a trained person, fully qualified to work on these units. He must have been trained and be familiar with the equipment and the installation, and he must wear the necessary protective items (gloves, glasses, protective clothes, safety shoes). Soldering and welding: Component, piping and connection soldering and welding operations must be carried out using the correct procedures and by qualified operators. Pressurised containers must not be subjected to shocks, nor to large temperature variations during maintenance and repair operations. Never work on a unit that is still energized. Never work on any of the electrical components, until the general power supply to the unit has been cut using the disconnect switch in the control box. If any maintenance operations are carried out on the unit, lock the power supply circuit in the open position ahead of the machine. If the work is interrupted, always ensure that all circuits are still deenergized before resuming the work. ATTENTION: Even if the unit has been switched off, the power circuit remains energized, unless the unit or circuit disconnect switch is open. Refer to the wiring diagram for further details. Attach appropriate safety labels. Operating checks: During the life-time of the system, inspection and tests must be carried out in accordance with national regulations. The information on operating inspections given in annex C of standard EN378-2 can be used if no similar criteria exist in the national regulations. Safety device checks (annex C6 EN378-2): The safety devices must be checked on site once a year for safety devices (high-pressure switches), and every five years for external overpressure devices (safety globe valves). Contact Carrier Service for a detailed explanation of the high-pressure switch test method. If the machine operates in a corrosive environment, inspect the protection devices more frequently. Regularly carry out leak tests and immediately repair any leaks.

High pressureLow pressure Min. Max. Min. Max. PS (bar) TS (C) Pressure switch cut-out pressure (bar) Valve cut-out pressure (bar) Test pressure, unit leak test (bar) -0.-15 -0.9 -25 62
Confirm that all accessories ordered for on-site installation have been delivered, and are complete and undamaged. The unit must be checked periodically during its whole operating life to ensure that no shocks (handling accessories, tools etc.) have damaged it. If necessary, the damaged parts must be repaired or replaced. See also chapter Maintenance.
Checks before system start-up Before the start-up of the refrigeration system, the complete installation, including the refrigeration system must be verified against the installation drawings, dimensional drawings, system piping and instrumentation diagrams and the wiring diagrams. During the installation test national regulations must be followed. If no national regulation exists, paragraph 9-5 of standard EN 378-2 can be used as a guide. External visual installation checks: Compare the complete installation with the refrigeration system and power circuit diagrams. Check that all components comply with the design specifications. Check that all safety documents and equipments that are required by current European standards are present. Verify that all safety and environmental protection devices and arrangements are in place and comply with the current European standard. Verify that all document for pressure containers, certificates, name plates, files, instruction manuals that are required documents required by the current European standards are present. Verify the free passage of access and safety routes. Check that ventilation in the plant room is adequate. Check that refrigerant detectors are present. Verify the instructions and directives to prevent the deliberate removal of refrigerant gases that are harmful to the environment. Verify the installation of connections. Verify the supports and fixing elements (materials, routing and connection). Verify the quality of welds and other joints. Check the protection against mechanical damage. Check the protection against heat. Check the protection of moving parts. Verify the accessibility for maintenance or repair and to check the piping. Verify the status of the valves. Verify the quality of the thermal insulation and of the vapour barriers.

5 - ELECTRICAL DATA

30RA (without hydronic module) Power circuit Nominal power supply Voltage range Maximum unit power input* Nominal unit current draw** Maximum unit current draw at 360 V*** Maximum unit current draw at 400 V**** Maximum start-up current Standard unit With electronic starter control * V-ph-Hz V kW A A A A A 200 240
400-3-50 360-440 The control circuit is supplied via the unit-mounted transformer 20.3 27.9 36.9 33.6 158.4 99.0 24.6 34.7 45.6 41.4 151.0 101.0 30.1 41.1 54.9 49.7 168.9 113.0 35.2 47.0 62.7 56.9 176.1 120.0 39.9 54.3 72.4 65.6 190.4 128.0 44.1 62.7 82.6 75.1 199.8 - 49.6 69.1 91.9 83.4 208.1 - 60.5 82.3 109.8 99.5 218.6 - 70.6 94.1 125.4 113.9 233.0 - 79.6 108.6 144.8 131.3 256.1 - 104.2 140.2 185.4 168.6 293.4 - 124.9 168.7 222.9 202.8 327.6 -

Control circuit supply

Short-circuit stability and protection
See table on the next page
Power input of the compressor(s) + fan(s) at maximum unit operating conditions: entering/leaving water temperature = 15C/10C, maximum condensing temperature of 67.8C, and 400 V nominal voltage (values given on the unit name plate). ** Nominal unit current draw at nominal conditions: evaporator entering/leaving water temperature 12C/7C, outdoor air temperature 35C. The current values are given at 400 V nominal voltage. *** Maximum unit operating current at maximum unit power input and 360 V. **** Maximum unit operating current at maximum unit power input and 400 V (values given on the unit name plate). Maximum instantaneous starting current at 400 V nominal voltage and with compressor in across-the-line start (maximum operating current of the smallest compressors + fan current + locked rotor current of the largest compressor). Maximum instantaneous starting current at 400 V nominal voltage and with compressor with electronic starter (maximum operating current of the smallest compressor(s) + fan current + reduced start-up current of the largest compressor). Hydronic module Single pump Shaft power Power input* Maximum current draw at 400 V** kW kW A kW kW A 040 0.75 1.1 2.1 2.2 2.7 4.0.75 1.1 2.1 2.2 2.7 4.0.75 1.1 2.1 2.2 2.7 4.0.75 1.1 2.1 2.2 2.7 4.1.1 1.4 3.1 2.2 2.7 4.1.1 1.4 3.1 2.2 2.7 4.120 1.1 1.4 3.1 2.2 2.7 4.7 1.85 2.5 5.0 3.0 4.0 6.1.85 2.5 5.0 3.0 4.0 6.1.85 2.5 5.0 3.0 4.0 6.5.5 6.6 10.6 5.5 6.6 10.5.5 6.6 10.6 5.5 6.6 10.6

3KX71-32-3AA00 + 3KX7112-4AA00 3KX71-31-3AA00 + 3KX71-31-3AB00 3KX71-32-4AA00 + 3KX7112-4AA00 3KX71-31-4AA00 + 3KX71-31-4AB00
This value corresponds to the switch/disconnect capacity, to the power distribution bus bar system capacity (if used) and to the protection circuit capacity in the standard unit. ** If the short-circuit current is higher, the unit can be protected by the fuse shown for the specific level. The fuses (not supplied for Carrier units) are as recommended, to be installed upstream of the unit. For unit sizes 040 to 160 a fused disconnect switch, equipped with fuses, can be installed in place of the standard unit switch. This should be done on site; please contact the local service department or a qualified electrician. Alternatively please order the special version from the factory by contacting your local Carrier dealer. For unit sizes 200 and 240 the installation requires drilling a hole into the control box, changing of the front door, and adapting the bus bar to be able to install the new fused disconnect switch which is larger than the one used for the standard units.To order this special version from the factory, contact your local Carrier office. *** Shows the new protection values with higher-capacity fuses than those specified in the previous column. If such fuses are part of the electrical installation upstream of the unit, this is sufficient as anti-short circuit protection to the specified level, without additional protection. **** If a protection device, other than the recommended fuses above, is used for the installation to ensure that no additional protection is required, the protection device must have the specified thermal limit (I2t) and limit effect characteristics for the short-circuit current. If the protection device does not have the specified characteristics, one of the specified protection fuses from the previous columns must be installed.
Electrical data notes 30RA:
30RA 040-240 units have a single power connection point located at the main switch. The control box includes the following standard features: - a main disconnect switch, starter and motor protection devices for each compressor, the fan and the pump - the control devices Field connections: All connections to the system and the electrical installations must be in full accordance with all applicable local codes. The Carrier 30RA units are designed and built to ensure conformance with these codes. The recommendations of European standard EN 602041 (machine safety electrical machine components part 1: general regulations - corresponds to IEC 60204-1) are specifically taken into account, when designing the electrical equipment. altitude: 2000 m presence of hard solids, class 4S2 (no significant dust present) presence of corrosive and polluting substances, class 4C2 (negligible) vibration and shock, class 4M2 b. Competence of personnel, class BA4* (trained personnel IEC 60364) 2. Power supply frequency variation: 2 Hz. 3. The neutral (N) conductor must not be connected directly to the unit (if necessary use a transformer). 4. Overcurrent protection of the power supply conductors is not provided with the unit. 5. The factory-installed disconnect switch(es)/circuit breaker(s) is (are) of a type suitable for power interruption in accordance with EN 60947. 6. The units are designed for connection to TN networks (IEC 60364). For IT networks the earth connection must not be at the network earth. Provide a local earth, consult competent local organisations to complete the electrical installation. Caution: If particular aspects of an actual installation do not conform to the conditions described above, or if there are other conditions which should be considered, always contact your local Carrier representative. * The required protection level for this class is IP43BW (according to reference document IEC 60529). All 30RA units are protected to IP44CW and fulfil this protection condition.

6.7 - Pressure drop in the plate heat exchangers
1000 Pressure drop, kPa 4
10 Water flow rate, l/s 40
6.5.2 - Maximum water loop volume Units with hydronic module incorporate an expansion tank that limits the water loop volume. The table below gives the maximum loop volume for pure water or ethylene glycol with various concentrations.
Pure water EG 10% EG 20% EG 35% 30RA 040-080 (in litres) 30RA 090-160 (in litres) 30RA 200-240 (in litres) 1400 1000
Legend RA 30 RA 30 RA 30 RA 30 RA 30 RA 30 RA 30 RA 30 RA 30 RA 30 RA 30 RA 240

EG: Ethylene glycol

6.6 - Unit operating range at full and part load

Entering air temperature

45 44.5 44
Evaporator water leaving temperature Evaporator T = 5 K The evaporator and the hydronic circuit pump are frost protected down to -10C outside air temperature. Operating range with required anti-freeze solution and special Pro-Dialog control configuration
7 - ELECTRICAL CONNECTION 7.1 - Control box 30RA 040-080

95 347

589 X 552 499
Legend 1 Main disconnect switch PE Earth connection S Power supply cable section (see table Recommended wire sections). X Disconnect switch position referred to the unit side Y Control box position referred to the unit base 30RA 040 - 080 30RA 090 - 160 30RA 200 - 240 X (mm)Y (mm) 762 1107

X C 652

258 193
NOTES: The 30RA 040-240 units have only one power connection point located at the main disconnect switch. Before connecting electric power cables, it is imperative to check the correct order of the 3 phases (L1 - L2 - L3). Non-certified drawings. Refer to the certified drawings supplied with the unit or available on request.
7.2 - Power supply The power supply must conform to the specification on the chiller name plate. The supply voltage must be within the range specified in the electrical data table. For connections refer to the wiring diagrams. WARNING: Operation of the chiller with an improper supply voltage or excessive phase imbalance constitutes abuse which will invalidate the Carrier warranty. If the phase imbalance exceeds 2% for voltage, or 10% for current, contact your local electricity supply source at once and ensure that the chiller is not switched on until corrective measures have been taken.
7.3 - Voltage phase imbalance (%) 100 x max. deviation from average voltage Average voltage Example: On a 400 V - 3 ph - 50 Hz supply, the individual phase voltages were measured to be: AB = 406 V ; BC = 399 ; AC = 394 V Average voltage = (406 + 399 + 394)/3 = 1199/3 = 399.7 say 400 V Calculate the maximum deviation from the 400 V average: (AB) = 406 - 400 = 6 (BC) = 400 - 399 = 1 (CA) = 400 - 394 = 6
The maximum deviation from the average is 6 V. The greatest percentage deviation is:100 x 6/400 = 1.5 % This is less than the permissible 2% and is therefore acceptable. 16

8 - Recommended wire sections Wire sizing is the responsibility of the installer, and depends on the characteristics and regulations applicable to each installation site. The following is only to be used as a guideline, and does not make Carrier in any way liable. After wire sizing has been completed, using the certified dimensional drawing, the installer must ensure easy connection and define any modifications necessary on site. The connections provided as standard for the field-supplied power entry cables to the general disconnect/ isolator switch are designed for the number and type of wires, listed in the table below. The calculations are based on the maximum machine current (see electrical data tables) and the standard installation practises, in accordance with IEC 60364, table 52C. For 30RA units, installed outside, the following standard installation practises have been maintained: No.17: suspended aerial lines, and No. 61: buried conduit with a derating coefficient of 20. The calculation is based on PVC or XLPE insulated cables with copper core. A maximum ambient temperature of 46C has been taken into consideration. The given wire length limits the voltage drop to < 5% (length L in metres - see table below). -
8.1 - Field control wiring For the field control wiring of the following elements please refer to the 30RA/RH - RY/RYH B series Pro-Dialog Plus Control manual, and the certified wiring diagram supplied with the unit: - Unit start/stop - Heating/cooling selection - Set-point selection - Customer interlock - (example: auxiliary contact of the chilled water pump contactor) - General alarm reporting, circuit A and circuit B
IMPORTANT: Before connection of the main power cables (L1 - L2 - L3) on the terminal block, it is imperative to check the correct order of the 3 phases before proceeding to the connection on the main disconnect/isolator switch.
UnitS Min. (mm2) Cable typeL (m)S Max. (mm2) by phase by phase 30RA 040 30RA 050 30RA 060 30RA 070 30RA 080 30RA 090 30RA 100 30RA 120 30RA 140 30RA 160 30RA 200 30RA 240 S 1x 6 1x 6 1x 10 1x 10 1x 16 1x 16 1x 25 1x 25 1x 35 1x 50 1x 70 1x 70 XLPE Cu XLPE Cu XLPE Cu XLPE Cu XLPE Cu XLPE Cu XLPE Cu XLPE Cu XLPE Cu XLPE Cu XLPE Cu XLPE Cu 1x 16 1x 25 1x 25 1x 35 1x 50 1x 70 1x 70 1x 95 1x 120 1x 120 1x 150 1x 185
Cable typeL (m) PVC Cu PVC Cu PVC Cu PVC Cu PVC Cu PVC Cu PVC Cu PVC Cu PVC Cu XLPE Cu XLPE Cu XLPE Cu 335 345
Power supply cable section (see the diagram in chapter: Electrical connection)
9 - WATER CONNECTIONS For size and position of the unit 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, shutoff and bleed valves and circuits built in, to prevent corrosion (example: damage to the protection of the tube surface if the fluid is polluted), fouling and deterioration of the pump fittings. Before any start-up verify that the heat exchange fluid is compatible with the materials and the water circuit coating. In case additives or other fluids than those recommended 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: 1. No NH4+ ammonium ions in the water, they are very detrimental for copper. This is one of the most important factors for the operating life of copper piping. A content of several tenths of mg/l will badly corrode the copper over time. 2. Cl- Chloride ions are detrimental for copper with a risk of perforations by corrosion by puncture. If possible keep below 10 mg/l. 3. SO42- sulphate ions can cause perforating corrosion, if their content is above 30 mg/l. 4. No fluoride ions (<0.1 mg/l). 5. No Fe2+ and Fe3+ ions with non negligible levels of dissolved oxygen must be present. Dissolved iron < 5 mg/l with dissolved oxygen < 5 mg/l. 6. Dissolved silicon: silicon is an acid element of water and can also lead to corrosion risks. Content < 1mg/l. 7. Water hardness: TH >2.8 K. Values between 10 and 25 can be recommended. This will facilitate scale deposit that can limit corrosion of copper. TH values that are too high can cause piping blockage over time. A total alkalimetric titre (TAC) below 100 is desirable. 8. Dissolved oxygen: Any sudden change in water oxygenation conditions must be avoided. It is as detrimental 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. 9. Specific resistance electric conductivity: the higher the specific resistance, the slower the corrosion tendency. Values above 3000 Ohm/cm are desirable. A neutral environment favours maximum specific resistance values. For electric conductivity values in the order of 200-600 S/cm can be recommended. 10. pH: Ideal case pH neutral at 20-25C (7 < pH < 8). ATTENTION: Charging, adding or draining fluid from the water circuit must be done by qualified personnel, using air vents and materials suitable for the products. The water circuit charging devices are field-supplied.

9.3 - Frost protection The plate heat exchangers, the piping and the hydronic module pump can be damaged by frost, despite the built-in anti-freeze protection of the units. The frost protection of plate heat exchanger and all hydronic module components is guaranteed down to -20C by automatically energized heaters and pump cycling. Never switch off the evaporator and hydronic circuit heaters or the pump, otherwise frost protection cannot be guaranteed. For this reason the main unit disconnect switch (QS101) as well as the auxiliary protection switch (QF101) for the heaters must always be left closed (for location of QS and QF 101 see wiring diagram). To ensure frost protection down to -20C, water circulation in the water circuit must be maintained by periodically switching on the pump. If a shut-off valve is installed, a bypass must be included as shown below. Winter position
IMPORTANT: Depending on the atmospheric conditions in your area you must do the following when switching the unit off in winter: - Add ethylene glycol with an adequate concentration to protect the installation up to a temperature 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 introduce ethylene glycol in the heat exchanger, using the water entering purge valve connection. At the start of the next season, refill the unit with water and add an inhibitor. - For the installation of auxiliary equipment, the installer must comply with basic regulations, especially for minimum and maximum flow rates, which must be between the values listed in the operating limit table (application data). - To prevent corrosion by differential aeration, the complete drained heat transfer circuit must be charged with nitrogen for a period of one month. If the heat transfer fluid does not comply with the Carrier regulations, the nitrogen charge must be added immediately.
Legend A Unit B Water network F Closed O Open
Typical hydronic circuit diagram
Legend Components of the unit and hydronic module 1 Victaulic screen filter 2 Expansion tank 3 Safety valve 4 Available pressure pump 5 Purge valve and pressure tap 6 Pressure gauge to measure the plate heat exchanger pressure drop (to be isolated with valve No. 5 if not used) 7 System air vent 8 Flow switch 9 Flow control valve 10 Plate heat exchanger 11 Evaporator defrost heater Installation components 12 Air vent 13 Thermometer sleeve 14 Flexible connection 15 Check valve 16 System water drain plug (on connection pipe supplied in the unit) 17 Pressure gauge 18 Freeze-up protection bypass valve (when valves 15 are closed during winter) 19 Charge valve --- Hydronic module (unit with hydronic module) Note: Units without hydronic module (option) are equipped with a flow switch and an internal piping heater.

12 - MAINTENANCE Any technician attending the machine for any purpose must be fully qualified to work on refrigerant and electrical circuits. All refrigerant charging, removal and draining operations must be carried out by a qualified technician and with the correct material for the unit. Any inappropriate handling can lead to uncontrolled fluid or pressure leaks. WARNING: Before doing any work on the machine ensure that the power is switched off. If a refrigerant circuit is opened, it must be evacuated, recharged and tested for leaks. Before any operation on a refrigerant circuit, it is necessary to remove the complete refrigerant charge from the unit with a refrigerant charge recovery group. 12.1 - General maintenance of the refrigerant circuit Keep the unit itself and the space around it clean and free of obstructions. Remove all rubbish such as packing materials, as soon as the installation is completed. Regularly clean the exposed pipework to remove all dust and dirt. This makes detection of water leaks easier, and they can be repaired before more serious faults develop. Confirm that all screwed and bolted connections and joints are secure. Secure connections prevent leaks and vibration from developing. Check that all insulation joints are securely closed and that all insulation is firmly in place. Check all heat exchangers and all pipework.
In order to measure the liquid refrigerant pressure and temperature ahead of the expansion device, an access port must be opened on the expansion device which causes a slight air bypass on the condenser. Wait until unit operation has stabilized before carrying out pressure and temperature measurements. WARNING: To ensure proper operation of 30RA units there must be at least 12 K of subcooling as the liquid refrigerant enters the expansion valve. The 30RA units use refrigerant. For your information, we are reproducing here some extracts from the official publication dealing with the design, installation, operation and maintenance of air conditioning and refrigeration systems and the training of people involved in these activities, agreed by the air conditioning and refrigeration industry. Apparent and actual subcooling

Pressure

12.2 - Refrigerant charge 12.2.1 - Verification of the charge CAUTION: The 30RA units are supplied with a precise R407C refrigerant charge (see Physical Data table). To verify the correct system charge prodeed as follows: Ensure that no bubbles appear in the sight-glass, when operating the unit at full load for a while, at a saturated condensing temperature of between 55 and 57C. If necessary cover a section of the coil surface to obtain this condensing temperature. Under these conditions the apparent subcooling which is equal to the saturated condensing temperature (1 - on the saturated dew point curve) minus the liquid refrigerant temperature (3) ahead of the expansion device must be between 12 and 14C. This corresponds to an actual subcooling temperature of between 5 and 7 K at the condenser outlet, depending on the unit type. Actual subcooling is equal the saturated liquid temperature (2 on the saturated bubble point curve) minus the liquid refrigerant temperature (3) ahead of the expansion device. Use the pressure tap supplied on the liquid piping to charge refrigerant and to find out the pressure of the liquid refrigerant. If the subcooling value is not correct, i.e. lower than the specified values, a leak detection test must be carried out on the unit, as it no longer contains its original charge.

Enthalpy Legend 1 Saturated condensing temperature at the dew point 2 Saturated liquid temperature at the bubble point 3 Liquid refrigerant temperature 4 Saturation curve at the dew point 5 Saturation curbe at the bubble point 6 Isotherms 7 Apparent subcooling (1 - 3) 8 Real subcooling (2 - 3) L Liquid L + V Liquid + vapour V Vapour
12.2.2 - Principles Refrigeration installations must be inspected and maintained regularly and rigorously by specialists. Their activities must be overseen and checked by properly trained people. To minimise discharge to the atmosphere, refrigerants and lubricating oil must be transferred using methods which reduce leaks and losses to a minimum and with materials that are suitable for the products. Leaks must be repaired immediately All units are equipped with two special connections on the suction and liquid line, which permit the connection of quick-connect recovery valves without loss of refrigerant. If the residual pressure is too low to make the transfer alone, a purpose-built refrigerant recovery unit must be used. Compressor lubricating oil contains refrigerant. Any oil drained from a system during maintenance must therefore be handled and stored accordingly. Refrigerant under pressure must never be discharged to the atmosphere. If the refrigerant circuit is opened, plug all openings if the operation takes up to one day, or charge the circuit with nitrogen for longer operations. 12.2.3 - Recharging liquid refrigerant CAUTION: 30RA units are charged with liquid HFC-407C refrigerant. This non-azeotropic refrigerant blend consists of 23% R-32, 25% of R-125 and 52% R-134a, and is characterised by the fact that at the time of the change in state the temperature of the liquid/vapour mixture is not constant, as with azeotropic refrigerants. All checks must be pressure tests, and the appropriate pressure/temperature ratio table must be used to determine the corresponding saturated temperatures (saturated bubble point curve or saturated dew point curve). Leak detection is especially important for units charged with refrigerant R407C. Depending on whether the leak occurs in the liquid or in the vapour phase, the proportion of the different components in the remaining liquid is not the same. NOTE: Regularly carry out leak checks and immediately repair any leak found. If there is a leak in the plate heat exchanger, this part must be replaced.
12.2.4 - Undercharge If there is not enough refrigerant in the system, this is indicated by gas bubbles in the moisture sight glass. If the undercharge is significant, large bubbles appear in the moisture sight glass, and the suction pressure drops. The compressor suction superheat is also high. The machine must be recharged after the leak has been repaired. Find the leak and completely drain the system with a refrigerant recovery unit. Carry out the repair, leak test and then recharge the system. Important: After the leak has been repaired, the circuit must be tested, without exceeding the maximum low-side operating pressure shown on the unit name plate. The refrigerant must always be recharged in the liquid phase into the liquid line. The refrigerant cylinder must always contain at least 10% of its initial charge. For the refrigerant quantity per circuit, refer to the data on the unit name plate. 12.2.5 - Characteristics of R407C See the table below. Saturated bubble point temperatures (bubble point curve) Saturated dew point temperatures (dew point curve) 12.3 - Electrical maintenance When working on the unit comply with all safety precautions decribed in section Maintenance safety considerations. - It is strongly recommended to change the fuses in the units every 15000 operating hours or every 3 years. - It is recommended to verify that all electrical connections are tight: a. after the unit has been received at the moment of installation and before the first start-up, b. one month after the first start-up,when the electrical components have reached their nominal operating temperatures, c. then regularly once a year.

R407C characteristics

Bar Saturated bubbleSaturated dew BarSaturated bubbleSaturated dew (relative) point temp. C point temp. C (relative) point temp. C point temp. C 1 1.25 1.5 1.2.25 2.5 2.3.25 3.5 3.4.25 4.5 4.5.25 5.5 5.6.25 6.5 6.7.25 7.5 7.8.25 8.5 8.9.25 9.5 9.10.25 -28.55 -25.66 -23.01 -20.57 -18.28 -16.14 -14.12 -12.21 -10.4 -8.67 -7.01 -5.43 -3.9 -2.44 -1.02 0.34 1.66 2.94 4.19 5.4 6.57 7.71 8.83 9.92 10.98 12.02 13.03 14.02 14.99 15.94 16.88 17.79 18.69 19.57 20.43 21.28 22.12 22.94 -21.72 -18.88 -16.29 -13.88 -11.65 -9.55 -7.57 -5.7 -3.93 -2.23 -0.61 0.93 2.42 3.85 5.23 6.57 7.86 9.11 10.33 11.5 12.65 13.76 14.85 15.91 16.94 17.95 18.94 19.9 20.85 21.77 22.68 23.57 24.44 25.29 26.13 26.96 27.77 28.56 10.5 10.11.25 11.5 11.12.25 12.5 12.13.25 13.5 13.14.25 14.5 14.15.25 15.5 15.16.25 16.5 16.17.25 17.5 17.18.25 18.5 18.19.25 19.5 19.75 23.74 24.54 25.32 26.09 26.85 27.6 28.34 29.06 29.78 30.49 31.18 31.87 32.55 33.22 33.89 34.54 35.19 35.83 36.46 37.08 37.7 38.31 38.92 39.52 40.11 40.69 41.27 41.85 42.41 42.98 43.53 44.09 44.63 45.17 45.71 46.24 46.77 47.29 29.35 30.12 30.87 31.62 32.35 33.08 33.79 34.5 35.19 35.87 36.55 37.21 37.87 38.51 39.16 39.79 40.41 41.03 41.64 42.24 42.84 43.42 44.01 44.58 45.15 45.71 46.27 46.82 47.37 47.91 48.44 48.97 49.5 50.02 50.53 51.04 51.55 52.05 BarSaturated bubbleSaturated dew (relative) point temp. C point temp. C 20 20.25 20.5 20.21.25 21.5 21.22.25 22.5 22.23.25 23.5 23.24.25 24.5 24.25.25 25.5 25.26.25 26.5 26.27.25 27.5 27.28.25 28.5 28.29.25 47.81 48.32 48.83 49.34 49.84 50.34 50.83 51.32 51.8 52.28 52.76 53.24 53.71 54.17 54.64 55.1 55.55 56.01 56.46 56.9 57.35 57.79 58.23 58.66 59.09 59.52 59.95 60.37 60.79 61.21 61.63 62.04 62.45 62.86 63.27 63.67 64.07 64.47 52.55 53.04 53.53 54.01 54.49 54.96 55.43 55.9 56.36 56.82 57.28 57.73 58.18 58.62 59.07 59.5 59.94 60.37 60.8 61.22 61.65 62.07 62.48 62.9 63.31 63.71 64.12 64.52 64.92 65.31 65.71 66.1 66.49 66.87 67.26 67.64 68.02 68.39
12.4 - Condenser coil We recommend, that finned coils are inspected regularly to check the degree of fouling. This depends on the environment where the unit is installed, and will be worse in urban and industrial installations and near trees that shed their leaves. For coil cleaning proceed as follows: Remove fibres and dust collected on the condenser face with a soft brush (or vacuum cleaner). Clean the coil with the appropriate cleaning agents. We recommend TOTALINE products for coil cleaning: Part No. P902 DT 05EE: traditional cleaning method Part No. P902 CL 05EE: cleaning and degreasing. These products have a neutral pH value, do not contain phosphates, are not harmful to the human body, and can be disposed of through the public drainage system. Depending on the degree of fouling both products can be used diluted or undiluted. For normal maintenance routines we recommend using 1 kg of the concentrated product, diluted to 10%, to treat a coil surface of 2 m2. This process can either be carried out with a TOTALINE applicator gun (part No. TE01 WA 4000EE) or using a highpressure spray gun in the low-pressure position. With pressurised cleaning methods care should be taken not to damage the coil fins. The spraying of the coil must be done: - in the direction of the fins - in the opposite direction of the air flow direction - with a large diffuser (25-30) - at a distance of 300 mm.

The two cleaning products can be used for any of the following coil finishes: Cu/Cu, Cu/Al, Cu/Al with Polual, Blygold and/or Heresite protection. It is not necessary to rinse the coil, as the products used are pH neutral. To ensure that the coil is perfectly clean, we recommend rinsing with a low water flow rate. The pH value of the water used should be between 7 and 8. WARNING: Never use pressurized water without a large diffusor. Concentrated and/or rotating water jets are strictly forbidden. Correct and frequent cleaning (approximately every three months) will prevent 2/3 of the corrosion problems. Never use a fluid with a temperature above 45C to clean the air heat exchangers.
13 - AQUASNAP MAINTENANCE PROGRAMME All maintenance operations must be carried out by technicians who have been trained on Carrier products, observing all Carrier quality and safety standards. Maintenance instructions During the unit operating life the service checks and tests must be carried out in accordance with applicable national regulations. If there are no similar criteria in local regulations, the information on checks during operation in annex C of standard EN 378-2 can be used. External visual checks: annex A and B of standard EN 378-2
13.2 - Description of the maintenance operations The equipment is supplied with polyolester oil (POE). Only use oil approved by Carrier. On request Carrier can carry out an oil analysis of your installation. Service A Full-load operating test Verify the following values: - compressor high-pressure side discharge pressure - compressor low-pressure side suction pressure - charge visible in the sight glass - temperature difference between the heat exchanger water entering and leaving temperature. Verify the alarm status
Corrosion checks: annex D of standard EN 378-2. These controls must be carried out: - After an intervention that is likely to affect the resistance or a change in use or change of high-pressure refrigerant, or after a shut down of more than two years. Components that do not comply, must be changed. Test pressures above the respective component design pressure must not be applied (annex B and D). - After repair or significant modifications or significant system or component extension (annex B) - After re-installation at another site (annexes A, B and D) - After repair following a refrigerant leak (annex D). The frequency of refrigerant leak detection can vary from once per year for systems with less than 1% leak rate per year to once a day for systems with a leak rate of 35% per year or more. The frequency is in proportion with the leak rate. NOTE: High leak rates are not acceptable. The necessary steps must be taken to eliminate any leak detected. NOTE 2: Fixed refrigerant detectors are not leak detectors, as they cannot locate the leak. 13.1 - Maintenance schedule Regular maintenance is indispensable to optimise the operating life and reliability of the equipment. Maintenance operations must be carried out in accordance with the schedules below: Service A B C D Frequency Weekly Monthly Annually Special cases

Carry out the QUICK TEST function (see 30RA/RH - 30RY/RYH B Pro-Dialog Plus Control manual): Check and log on to the user menu configuration Load sequence selection...... Capacity ramp loading selection..... Start-up delay...... Burner section..... Pump control...... Set-point reset mode..... Night-time capacity setback..... Re-enter the set-points (see Controls section) To start up the chiller WARNING Be sure that all service valves are open, and that the pump is on before attempting to start this machine. Once all checks have been made, start the unit in the LOCAL ON position. Unit starts and operates properly Temperatures and pressures warning Once the machine has been operating for a while and the temperatures and pressures have stabilized, record the following Evaporator entering water..... Evaporator leaving water..... Ambient temperature..... Circuit A suction pressure..... Circuit B suction pressure..... Circuit A discharge pressure..... Circuit B discharge pressure..... Circuit A suction temperature.... Circuit B suction temperature..... Circuit A discharge temperature..... Circuit B discharge temperature..... Circuit A liquid line temperature..... Circuit B liquid line temperature..... notes:.................
Order No.: 13435-76, 07.2007 - Supersedes order No.: 13435-76, 09.2003. Manufacturer reserves the right to change any product specificatiuons without notice.
Manufactured by: Carrier SCS, Montluel, France Printed in the Netherlands