Carrier AQUAZONE 50HQP072-120 Installation And Service Instructions Manual

Contents

27Filters — Filters must be clean for maximum performance.Inspect filters every month under normal operating conditions.replace when necessary.Washable, high efficiency, electrostatic filters, when dirty,can exhibit a very high pressure drop for the fan motor and re-duce air flow, resulting in poor performance. It is especially im-portant to provide consistent washing of these filters (in the op-posite direction of the normal air flow) once per month using ahigh pressure wash.Water Coil — Keep all air out of the water coil. Checkopen loop systems to be sure the well head is not allowing airto infiltrate the water line. Always keep lines airtight.DIRECT GROUND WATER APPLICATIONS — If thesystem is installed in an area with a known high mineral con-tent (125 ppm or greater) in the water, it is best to establish aperiodic maintenance schedule with the owner so the coil canbe checked regularly.Should periodic coil cleaning be necessary, use standardcoil cleaning procedures, which are compatible with the heatexchanger material and copper water lines. Generally, the morewater flowing through the unit, the less chance for scaling.Therefore, 1.6 L/m per kW is recommended as a minimumflow. Minimum flow rate for entering water temperatures be-low 10.0 C is 2.2 L/m per kW.ALL OTHER WATER LOOP APPLICATIONS — Gener-ally, water coil maintenance is not needed for closed loop sys-tems. However, if the piping is known to have high dirt or de-bris content, it is best to establish a periodic maintenanceschedule with the owner so the water coil can be checked regu-larly. Dirty installations are typically the result of deteriorationof iron or galvanized piping or components in the system.Open cooling towers requiring heavy chemical treatment andmineral buildup through water use can also contribute to highermaintenance. Should periodic coil cleaning be necessary, usestandard coil cleaning procedures, which are compatible withboth the heat exchanger material and copper water lines. Gen-erally, the more water flowing through the unit, the less chancefor scaling. However, flow rates over 3.9 L/m per kW can pro-duce water (or debris) velocities that can erode the heat ex-changer wall and ultimately produce leaks.Condensate Drain Pans — Check condensate drainpans for algae growth twice a year. 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.Refrigerant System — Verify air and water flow ratesare at proper levels before servicing. To maintain sealed circuit-ry integrity, do not install service gages unless unit operationappears abnormal.Condensate Drain Cleaning — Clean the drain lineand unit drain pan at the start of each cooling season. Checkflow by pouring water into drain. Be sure trap is filled to main-tain an air seal.Air Coil Cleaning — Remove dirt and debris from evap-orator coil as required by condition of the coil. Clean coil witha stiff brush, vacuum cleaner, or compressed air. Use a fincomb of the correct tooth spacing when straightening mashedor bent coil fins.Condenser Cleaning — Water-cooled condensers mayrequire cleaning of scale (water deposits) due to improperlymaintained closed-loop water systems. Sludge build-up mayneed to be cleaned in an open water tower system due toinduced contaminants.Local water conditions may cause excessive fouling orpitting of tubes. Condenser tubes should therefore be cleaned atleast once a year, or more often if the water is contaminated.Proper water treatment can minimize tube fouling andpitting. If such conditions are anticipated, water treatmentanalysis is recommended. Refer to the Carrier System DesignManual, 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. 22.FORCED CIRCULATION METHOD — Fully open ventpipe when filling condenser. The vent may be closed whencondenser is full and pump is operating. See Fig. 23.Regulate flow to condenser with a supply line valve. Ifpump is a nonoverloading type, the valve may be fully closedwhile pump is running.IMPORTANT: Units should never be operated with-out a filter.IMPORTANT: To avoid fouled machinery and extensiveunit clean-up, DO NOT operate units without filters inplace. DO NOT use equipment as a temporary heat sourceduring construction.CAUTIONFollow all safety codes. Wear safety glasses and rubbergloves when using inhibited hydrochloric acid solution.Observe and follow acid manufacturer’s instructions. Fail-ure to follow these safety precautions could result in per-sonal injury or equipment or property damage.Fig. 22 — Gravity Flow MethodFILL CONDENSER WITHCLEANING SOLUTION. DONOT ADD SOLUTIONMORE RAPIDLY THANVENT CAN EXHAUSTGASES CAUSED BYCHEMICAL ACTION.PAILFUNNELCONDENSERPAIL1.0 TO 1.2 mVENTPIPE 1.5 m APPROX1-IN.(25 mm)PIPEa50-8586