Carrier AquaForce PUREtec 30XW-VZE 451 Installation, Operation And Maintenance Instructions

2911.7.2 - Compressor rotation controlCorrect compressor rotation is one of the most critical applicationconsiderations. Reverse rotation, even for a very short duration,damages the compressor and can even destroy it.The reverse rotation protection scheme must be capable ofdetermining the direction of rotation and stopping the compressorwithin one second. Reverse rotation is most likely to occurwhenever the wiring at the compressor terminals has beenmodified.To minimise the opportunity for reverse rotation, the followingprocedure must be applied. Rewire the power cables to thecompressor terminal pin as originally wired. Apply a counter-torqueat the lower nut at the supply cable terminal during installation.For replacement of the compressor, a low pressure switch isincluded with the compressor. This low pressure switch should betemporarily installed as a hard safety on the high pressure part ofthe compressor. The purpose of this switch is to protect thecompressor against any wiring errors at the compressor terminalpin. The electrical contact of the switch would be wired in serieswith the high pressure switch. The switch will remain in place untilthe compressor has been started and direction of rotation hasbeen verified; at this point, the switch will be removed.The switch that has been selected for detecting reverse rotationis Carrier part number HK01CB001. This switch opens the contactswhen the pressure falls below 7 kPa.The switch is a manual reset type that can be reset after thepressure has once again risen above 70 kPa. It is critical that theswitch be a manual reset type to preclude the compressor fromshort cycling in the reverse direction.11.8 - Frequency variator maintenanceATTENTION: Before any intervention at the frequency variator,ensure that the disconnect/isolator switch is open and thatno voltage is present (reminder: the capacitor discharge timeis approximately 20 minutes).Only a well-qualified person is allowed to replace or modifythe components inside the frequency variator.During periodic inspections, check the ventilation grilles at thefrequency variator door; ensure that they are not pierced, damagedor obstructed.Replace the fan, if a “replace fan” alert/warning is displayed in thealarm list.For any other alarm or problem at the frequency variator, contactthe Carrier service department.The frequency variators do not require a dielectric test, even ifthey are replaced parts: they are systematically checked beforedelivery. Otherwise the filtering components installed in thefrequency variator can falsify the measurement and may even bedamaged.If it is necessary to test the insulation of a component(e.g. compressor, cables) the frequency variator must bedisconnected at the power circuit.11.9 - High pressure safety loop periodic testThe aim of this periodic test is to check the settings of the highpressure safety loop on one of the unit’s refrigerant circuits andcheck it is operating correctly. This procedure must be repeatedfor each circuit.11.9.1 - Complete safety loop testThe purpose of this periodic test is to verify the proper functioningand setting of the high-pressure safety loop of a refrigerant circuit.In order to reach the triggering pressure of the loop, the pressureand temperature thresholds activating the discharge of thecompressor by the regulation system are raised.This procedure must be repeated for each circuit of the unit.1. Set up a calibrated pressure gauge on the high pressure partof the circuit (compressor discharge)2. Reset all activated alarms3. Activate the HP test mode for the corresponding circuit via thecontrol interface.Enable Quick Test Mode (Quick Test Menu> [ QCK_TEST ]parameter active)Activate the high pressure test for the desired circuit (Menu QuickTest> parameter [HP_TEST] to 0 for circuit A or 1 for the B circuit.The corresponding circuit starts to perform the HP test.4. Getting Started Machine5. For water-cooled units, stop the circulation of the secondarycircuit to the condenser in order to stop the condensation andcause the increase in pressure (this operation is managed bythe control on air-cooled machines)6. Record the trigger value7. Check that both HPS were triggeredIf both HPS have tripped, go to step 10If only one of the HPS has tripped, go to step 88. Replace the triggered HPS with another system whose triggervalue is adequate .Alternatively, an emergency stop button can be installed.9. Repeat steps 2 to 610. Check if the trigger values are correctThe release values should be between -1 .5 /+0.5 bars of nominalvalues indicated on the unit.11. Reset all alarms12. Reset all HPSNote:Access to the maintenance functions can be protected by apassword. Contact your dealer or the manufacturer’s servicedepartment for more information.For step 8, the electrical disconnection of the triggered HPSand its substitution must be performed in an environmentwith live parts. All the procedures and authorization providedfor this type of intervention must be respected.The type of connector must be WAGO 231-302 or equivalent.11 - STANDARD MAINTENANCE

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