Carrier AQUAZONE 50PEC09-18 Installation, Start-up And Service Instructions Manual

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46produce water (or debris) velocities that can erode the heat ex-changer wall and ultimately produce leaks.Proper water treatment can minimize tube fouling andpitting. If such conditions are anticipated, water treatment anal-ysis is recommended. Refer to the Carrier System Design Man-ual, Part 5, for general water conditioning information.Clean condensers with an inhibited hydrochloric acid solu-tion. The acid can stain hands and clothing, damage concrete,and, without inhibitor, damage steel. Cover surroundings toguard against splashing. Vapors from vent pipe are not harmful,but take care to prevent liquid from being carried over by thegases.Warm solution acts faster, but cold solution is just as effec-tive if applied for a longer period.GRAVITY FLOW METHOD — Do not add solution fasterthan vent can exhaust the generated gases.When condenser is full, allow solution to remain overnight,then drain condenser and flush with clean water. Follow acidmanufacturer’s instructions. See Fig. 37.FORCED CIRCULATION METHOD — Fully open ventpipe when filling condenser. The vent may be closed whencondenser is full and pump is operating. See Fig. 38.Regulate flow to condenser with a supply line valve. Ifpump is a nonoverloading type, the valve may be fully closedwhile pump is running.For average scale deposit, allow solution to remain in con-denser overnight. For heavy scale deposit, allow 24 hours.Drain condenser and flush with clean water. Follow acid manu-facturer’s instructions.Condensate Pans — Check condensate drain pans foralgae growth every three months. If algae growth is apparent,consult a water treatment specialist for proper chemical treat-ment. The application of an algaecide every three months willtypically eliminate algae problems in most locations. Checkcondensate hose for leaks and blockage and correct anyproblems.Blower Motors — All units have lubricated fan motors.BLOWER MOTORS SHOULD NEVER BE LUBRICATEDUNLESS OBVIOUS, DRY OPERATION IS SUSPECTED.Periodic maintenance oiling is not recommended because itwill result in dirt accumulating on excess oil and cause eventu-al motor failure. Conduct annual dry operation check and am-perage check to ensure amp draw is no more than 10% greaterthan that indicated by serial plate data.Compressor — Conduct an amperage check annually onthe compressor and fan motor. Amperage draw should notexceed normal full load amps. Maintain a log of amperage todetect deterioration prior to component failure.Safety Control Reset — The 50PEC heat pumps arefurnished with high-pressure, low-pressure and low-temperature cutouts to prevent the machine from operating atabnormal conditions of temperature or water flow.The contacts of the high-pressure control used on 50PECunits are designed to open at 376 psig and automaticallyre-close at 304 psig. The Complete C or Deluxe D controlmonitors this and other functions such as refrigerant tempera-tures and pressures and condensate overflow and will interruptunit heating or cooling operation.The machine must be reset manually. Reset is accomplishedby pressing the STOP button and then pushing either HI HEAT,LOW HEAT, HI COOL or LO COOL to restart the unit in thedesired mode of operation. (The 50PEC unit can also be resetby opening and closing the supply power disconnect switch.)CAUTIONFollow all safety codes. Wear safety glasses and rubbergloves when using inhibited hydrochloric acid solution.Observe and follow acid manufacturer’s instructions.IMPORTANT: If the unit must be reset more than twice,check the unit for a dirty filter, abnormal entering watertemperature, inadequate or excessive water flow, and inter-nal malfunctions. If the unit continues to cut out, contact atrained service technician.WARNINGWhen replacing the compressor contactor or lockout relayin a unit with electromechanical controls, use only Carrierfactory authorized parts. Substitution of other componentsmay result in an inoperative safety circuit and may cause ahazardous condition.SUCTIONPUMPSUPPORTTANKFINE MESHSCREENRETURNGAS VENTPUMP PRIMINGCONN. GLOBEVALVESSUPPLY1” PIPECONDENSERREMOVE WATERREGULATING VALVEFig. 38 — Forced Circulation MethodFILL CONDENSER WITHCLEANING SOLUTION. DONOT ADD SOLUTIONMORE RAPIDLY THANVENT CAN EXHAUSTGASES CAUSED BYCHEMICAL ACTION.PAILFUNNELCONDENSERPAIL3’ TO 4’VENTPIPE 5’ APPROX1”PIPEFig. 37 — Gravity Flow Method