Carrier AquaForce B Series Controls, Start-up, Operation, Service And Troubleshooting Instructions

Also see for AquaForce 30XV140: Controls, start-up, operation, service and troubleshooting instructions

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Carrier AquaForce B Series Controls, Start-up, Operation, Service And Troubleshooting Instructions Manual pdf 75 page image

759. Finned surfaces should remain wet with cleaning solutionfor 10 minutes.10. Ensure surfaces are not allowed to dry before rinsing. Reap-ply cleaner as needed to ensure 10-minute saturation isachieved.11. Thoroughly rinse all surfaces with low velocity clean waterusing downward rinsing motion of water spray nozzle. Pro-tect fins from damage from the spray nozzle.Condenser FansA formed metal mount bolted to the coil caps supports each fanand motor assembly. A shroud and a wire grille provide protectionfrom the rotating fan. See Fig. 72. To remove the fan a specialpuller (RCD part no. 30RB680082) can be used. The fan utilizes aset screw and does not require the use of retaining compound inthe keyway. The fan can be removed without the puller, but its useeases disassembly. The exposed end of the fan motor shaft is pro-tected from weather by grease. If fan motor must be removed forservice or replacement, re-grease the fan shaft. The fan needs to bepositioned fully down against the step on the motor shaft. Applyblue thread locker (Loctite 243) to the threads of both the axialbolt and the set screw. Install the thick washer and M8 axial bolt;do not fully tighten. Install set screw and tighten to 16 ± 2 ft-lbs(21.7 ± 2.7 Nm). Torque the axial bolt to 24 ± 2 ft-lbs (32.5 ± 2.7Nm). Reinstall shroud and wire grille.High Static Fan OptionA different fan blade is used for the high static fan option. Itdoes not have the set screw to retain the key, so retaining com-pound must be used. The same puller is required to remove thisfan blade. Use Loctite 603 retaining compound on the shaftand keyway during re-assembly. Remove any grease or con-taminates from the fan motor shaft before installation.Refrigerant CircuitLEAK TESTINGUnits are shipped with complete operating charge of refriger-ant R-134a (see Physical Data tables supplied in the 30XV in-stallation instructions) and should be under sufficient pressureto conduct a leak test. If there is no pressure in the system, in-troduce enough nitrogen to search for the leak. Repair the leakusing good refrigeration practices. After leaks are repaired,system must be evacuated and dehydrated.REFRIGERANT CHARGERefer to Physical Data tables supplied in the 30XV installation in-structions. Immediately ahead of filter drier in each circuit is a fac-tory-installed liquid line service valve. Each valve has a 1/4-in. ac-cess connection for charging liquid refrigerant.Charging with Unit Off and EvacuatedClose liquid line service valve before charging. Weigh in chargeshown on unit nameplate. Open liquid line service valve; start unitand allow it to run several minutes fully loaded. Check for a clearsight glass. Be sure clear condition is liquid and not vapor.Charging with Unit RunningIf charge is to be added while unit is operating, all condenserfans and compressors must be operating. It may be necessaryto block condenser coils at low ambient temperatures to raisecondensing pressure to approximately 198 psig (1365 kPa) toturn all condenser fans on. Do not totally block a coil to do this.Partially block all coils in uniform pattern. Charge each circuituntil sight glass shows clear liquid, and has a liquid line tem-perature of 103°F (39°C).Add 3 to 5 lb (1.36 to 2.27 kg), depending on unit size and coiltype, of liquid charge into the fitting located on the tube enter-ing the evaporator. This fitting is located between the electron-ic EXV and the evaporator.Allow the system to stabilize and then recheck the liquid tem-perature. If needed, add additional liquid charge, 3 to 5 lb at atime, allowing the system to stabilize between each charge ad-dition. Slowly add charge as the sight glass begins to clear toavoid overcharging.Safety DevicesThe 30XV chillers contain many safety devices and protectionlogic built into the electronic control. Following is a descrip-tion of the major safeties.COMPRESSOR PROTECTIONMotor OverloadThe compressor VFD fuses and drive logic protect each com-pressor against overcurrent.All compressors have factory-installed high-pressure switches.See Table 46. Each high-pressure switch is connected directlyto its associated VFD (terminals 12 and 37). If the switchopens during operation, the compressor will be shut down.Manual reset of the high pressure switch, VFD, and the controlis required to restart the compressor.Table 46 — High-Pressure Switch SettingsFig. 72 — Fan MountingIMPORTANT: When adjusting refrigerant charge, circulatefluid through evaporator continuously to prevent freezing andpossible damage to the evaporator. Do not overcharge, andnever charge liquid into the low-pressure side of system.UNIT SWITCH SETTINGpsig kPa30XV 323.5 + 0.0 –14.0 2230 + 0.0 –14.0WIRE GUARDFAN BLADEFAN DECKFORMED METALMOUNTMOTOR a30-5863