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V I. START-Up <br /> A. REVIEW INSTALLATION <br /> After carefully observing all points listed under"Installation" (Section IV), rotate the <br /> shaft by hand. Rotation should be free and without noise. <br /> B. INLET AND OUTLET <br /> If tyre installation hermits it, close both the inlet and outlet of the unit to relieve the <br /> load during start-up. If this is not possible, close either the inlet or the outlet. NEVER <br /> .tart the unit w itlr Loth the inlet and nutlet open. <br /> C. CHECK ROTA`rION <br /> Switch on the unit rnutor momentarily to check for correct rotation. Rotation of the <br /> unit should be as indicated by an arrow on the outlet bead. If the rotation is wrong, cor- <br /> rect as necessary. <br /> D. LOAD CONDITIONS <br /> Roffman"T" Series units should not normally be operated with both the inlet and out- <br /> let connections Nvide open. This condition allows maximurn volume flow through the <br /> unit and, in some cases, will seriously overload the motor. In a centrifugal type unit, <br />' the minimum load on the rnotor exists when either the inlet or the outlet of the unit is <br /> coil-,plet el y closed. (DO NOT, however, operate the unit under either shut-off or surge <br /> condition as indicated under"Operation, Maintenance-). For a safe maximum load <br /> condition, it is recommended that the volume handled by the unit be controlled by a <br /> regulating shut-Off valve mounted on the inlet of lire unit. Apply load by gradually <br /> opening the control valve(s). Current readings should not exceed the full load ratingof <br /> the motor as stamped on the motor name plate. Under full load conditions, the unit <br /> should rotate at the full load speed indicated on the motor nartrc plate. <br /> E. CHECK POINTS <br /> Check for excessive vibration (more than 1.50 mils), surging, and any unusual noise. If <br /> any problem is noticed --- SWITCH OFF immediately to lock out the electrical supply. <br /> Check carefully for ille causO of the trouble, Unci correct as necessary. <br /> The unit may now be put into operation, without manipulating the control valve, but <br /> during the first eight (8) hours of running, it should be periodically observed and <br /> checked for excessive air discharge and bearing; temperatures, vibration and noise. At <br /> this time, checks should be made of motor input current and bearing temperatures to <br /> insure that they du not exceed manufacturers recommendations. <br /> VII. OPERATION AND MAINTENANCE <br /> Svstem maintenance and operational service items are outlined to be accomplished as <br /> follows: <br /> A. LUBRICATION <br /> Operation Condition flours of Operation Before Reg;re.as n� <br /> Normal: 1500-2000 <br /> Severe: 750-1000 <br /> 1. Grease bearings located on compressor and motor. <br /> ia. There are two compressor bearings with grease fittings. One bearing;on the <br /> front and one bearing on the rear of tile shaft. Also two motor bearings with <br /> grease f ittings, one f ront and one rear. <br />' b. Bearings may be greased with a standard manual level pump action grease <br /> gun. Grease application shall not exceed three pumps per bearing. <br /> e. Hoffman"'1"' series corepressors are for the most part maintenance-free pro- <br /> viding that the separators and filters are maintained regularly. <br />' A recommended grease is a rust inhibiting Lithium base of NLGI 3 consistency such as 1 <br /> . Shell Alvania #l3 or Mobilux !#3. <br /> 6 <br />