Carrier Aquazone 50PTH036 Installation, Start-up And Service Instructions Manual

Also see for Aquazone 50PTH024: Installation, Start-Up and Service Instructions

9Water Supply and Quantity — Check water supply. Watersupply should be plentiful and of good quality. See Table 2 forwater quality guidelines.In all applications, the quality of the water circulatedthrough the heat exchanger must fall within the ranges listed inthe Water Quality Guidelines table. Consult a local water treat-ment firm, independent testing facility, or local water authorityfor specific recommendations to maintain water quality withinthe published limits.GROUND-LOOP APPLICATIONS — Temperatures between20 and 110 F and a cooling capacity of 2.25 to 3 gpm of flowper ton is recommended. In addition to complying with anyapplicable codes, consider the following for system piping:• Limit piping materials to only polyethylene fusion in theburied sections of the loop.• Do not use galvanized or steel fittings at any time due tocorrosion.• Avoid all plastic to metal threaded fittings due to thepotential to leak. Use a flange fitted substitute.• Do not overtighten connections.• Route piping to avoid service access areas to unit.• Use pressure-temperature plugs to measure flow of pres-sure drop.Table 2 — Water Quality GuidelinesLEGEND*Heat exchanger materials considered are copper, cupronickel, 304 SS(stainless steel), 316 SS, titanium.†Closed recirculating system is identified by a closed pressurized pipingsystem.**Recirculating open wells should observe the open recirculating designconsiderations.††If the concentration of these corrosives exceeds the maximum allow-able level, then the potential for serious corrosion problems exists.Sulfides in the water quickly oxidize when exposed to air, requiring thatno agitation occur as the sample is taken. Unless tested immediatelyat the site, the sample will require stabilization with a few drops of oneMolar zinc acetate solution, allowing accurate sulfide determination upto 24 hours after sampling. A low pH and high alkalinity can causesystem problems, even when both values are within ranges shown.The term pH refers to the acidity, basicity, or neutrality of the watersupply. Below 7.0, the water is considered to be acidic. Above 7.0,water is considered to be basic. Neutral water registers a pH of 7.0.To convert ppm to grains per gallon, divide by 17. Hardness in mg/l isequivalent to ppm. considered to be basic. Neutral water contains apH of 7.0. To convert ppm to grains per gallon, divide by 17. Hardnessin mg/l is equivalent to ppm.IMPORTANT: Failure to comply with the above requiredwater quality and quantity limitations and the closed-system application design requirements may cause damageto the tube-in-tube heat exchanger. This damage is not theresponsibility of the manufacturer.CONDITION HX MATERIAL* CLOSEDRECIRCULATING† OPEN LOOP AND RECIRCULATING WELL**Scaling Potential — Primary MeasurementAbove the given limits, scaling is likely to occur. Scaling indexes should be calculated using the limits below.pH/CalciumHardness Method All N/A pH < 7.5 and Ca Hardness, <100 ppmIndex Limits for Probable Scaling Situations (Operation outside these limits is not recommended.)Scaling indexes should be calculated at 150 F for direct use and HWG applications, and at 90 F for indirect HX use. A monitoring plan should be imple-mented.Ryznar Stability Index All N/A 6.0 - 7.5If >7.5 minimize steel pipe use.Langelier Saturation IndexAll N/A–0.5 to +0.5If <–0.5 minimize steel pipe use.Based upon 150 F HWG and direct well, 85 F indirect well HX.Iron FoulingIron Fe 2+ (Ferrous)(Bacterial Iron Potential) All N/A <0.2 ppm (Ferrous)If Fe 2+ (ferrous) >0.2 ppm with pH 6 - 8, O 2<5 ppm check for iron bacteria.Iron Fouling All N/A <0.5 ppm of OxygenAbove this level deposition will occur.Corrosion Prevention††pH All 6 - 8.5Monitor/treat as needed.6 - 8.5Minimize steel pipe below 7 and no open tanks with pH <8.Hydrogen Sulfide (H2S)All N/A<0.5 ppmAt H2S>0.2 ppm, avoid use of copper and cupronickel piping or HXs.Rotten egg smell appears at 0.5 ppm level.Copper alloy (bronze or brass) cast components are okay to <0.5 ppm.Ammonia Ion as Hydroxide,Chloride, Nitrate and SulfateCompounds All N/A <0.5 ppmMaximum Chloride Levels Maximum allowable at maximum water temperature.50 F (10 C) 75 F (24 C) 100 F (38 C)Copper N/A <20 ppm NR NRCupronickel N/A <150 ppm NR NR304 SS N/A <400 ppm <250 ppm <150 ppm316 SS N/A <1000 ppm <550 ppm <375 ppmTitanium N/A >1000 ppm >550 ppm >375 ppmErosion and CloggingParticulate Size and ErosionAll<10 ppm of particles and amaximum velocity of 6 fps.Filtered for maximum800 micron size.<10 ppm (<1 ppm “sandfree” for reinjection) of particles and a maximumvelocity of 6 fps. Filtered for maximum 800 micron size. Any particulate thatis not removed can potentially clog components.Brackish All N/A Use cupronickel heat exchanger when concentrations of calcium or sodiumchloride are greater than 125 ppm are present. (Seawater is approximately25,000 ppm.)HWG — Hot Water GeneratorHX — Heat ExchangerN/A — Design Limits Not Applicable Considering RecirculatingPotable WaterNR — Application Not RecommendedSS — Stainless Steel