Carrier 50VZ Installation, Operation And Maintenance Instructions

Also see for 38PZ: Installation manual Installation manual

Carrier 50VZ Installation, Operation And Maintenance Instructions Manual pdf 34 page image

34SERVICEIndoor fan air adjustmentThe drive is factory set in accordance with the tables on pages18-25. When indoor pressure and air flow requirements differfrom nominal ratings, the motor pulley can be adjusted fordifferent available static pressure values.To change the fan speed (see Fig. 28):1. Move the motor along its track in order to remove thebelt.2. Loosen the pulley setscrews and rotate as necessary.3. Tighten the setscrews .4. Replace the belt(s) in the channel of the pulley.5. Tighten the belt(s), using the tension screw nut andwasher .To align fan and motor pulleys:1. Loosen fan pulley setscrews. Slide fan pulley along thepulley shaft and align with the motor using a ruler,making sure that it is parallel to the belt.2. Tighten the fan pulley setscrews.To adjust the belt tension, loosen the motor mounting platebolts and slide the motor mounting plate until the belt is asshown in Fig. 29.Fig. 28 - Fan speed adjustmentLegend1 Motor support2 Motor pulley3 Setscrews4 Motor5 Belt6 Tensioning screw7 Fan pulley8 Fan scrollGENERAL MAINTENANCEATTENTION: Before starting any servicing or maintenanceoperation on the unit, make sure that the power supply has beendisconnected. A current discharge could cause personal injury.In order to obtain maximum performance from the unit specialattention should be paid to the following points:- Electrical connections: The supply voltage should be±10% of the nominal voltage limits.Ensure that no faulty contacts exist in the terminal blocks,contactor boards, etc. Make sure that all the electricalconnections are properly tightened, and that all theelectrical components (contactors, relays, etc) are firmlysecured to the corresponding rails.Pay special attention to the condition of the connectingcables between the control elements and the electrical box,and to that of the unit power supply cable. They shouldnot be twisted and there should be no slits or notches inthe insulation. Check the starting and running consumptionsare within the limits specified in the correspondingtechnical information.- Drainage: Frequently check that the drain is notobstructed, and that the condensate pan is clean and level.- Inlet air filter: This should be cleaned periodically. Thefrequency depends on the purity of the entering air. Thefilter may be cleaned with a household vacuum cleaner, orby immersing it in water.- Refrigerant circuit: Ensure that there is no leakage ofrefrigerant or oil from the compressor. Check that the highand low side operating pressures are normal. Make surethat the coils are not dirty. If necessary an optional filtermay be placed at the outdoor air inlet. Check for unusualcompressor noise.- Controls: Check the operation of all electric controls,high and low pressurestats, etc.

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