Carrier 50PSW036-360 Water Quality Guidelines, Condition Closed Open Loop and Recirculating Well

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Table 2 — Water Quality Guidelines

 

 

 

 

CONDITION

HX

CLOSED

OPEN LOOP AND RECIRCULATING WELL**

MATERIAL*

RECIRCULATING†

 

 

Scaling Potential — Primary Measurement

Above the given limits, scaling is likely to occur. Scaling indexes should be calculated using the limits below.

pH/Calcium

All

N/A

pH < 7.5 and Ca Hardness, <100 ppm

Hardness Method

 

 

 

Index 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 implemented.

Ryznar Stability Index

All

N/A

 

6.0 - 7.5

 

 

 

 

If >7.5 minimize steel pipe use.

 

 

 

 

 

 

Langelier Saturation Index

 

 

 

 

–0.5 to +0.5

 

 

All

N/A

 

If <–0.5 minimize steel pipe use.

 

 

 

 

Based upon 150 F HWG and direct well, 85 F indirect well HX.

Iron Fouling

 

 

 

 

 

 

 

Iron Fe2+ (Ferrous)

 

 

 

 

<0.2 ppm (Ferrous)

 

(Bacterial Iron Potential)

All

N/A

If Fe2+ (ferrous) >0.2 ppm with pH 6 - 8, O2<5 ppm check for

 

 

 

 

 

iron bacteria.

 

Iron Fouling

All

N/A

 

 

<0.5 ppm of Oxygen

 

 

Above this level deposition will occur.

 

 

 

Corrosion Prevention††

 

 

 

 

 

 

 

pH

All

6 - 8.5

 

6 - 8.5

 

 

 

Monitor/treat as needed.

Minimize steel pipe below 7 and no open tanks with pH <8.

 

 

Hydrogen Sulfide (H2S)

 

 

 

 

<0.5 ppm

 

 

All

N/A

At H2S>0.2 ppm, avoid use of copper and cupronickel piping of 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 Hydrox-

 

 

 

 

<0.5 ppm

 

ide, Chloride, Nitrate and

All

N/A

 

 

 

 

 

Sulfate Compounds

 

 

 

 

 

 

 

Maximum Chloride Levels

 

 

Maximum allowable at maximum water temperature.

 

Copper

N/A

50 F (10 C)

 

75 F (24 C)

 

100 F (38 C)

 

<20 ppm

 

NR

 

NR

 

Cupronickel

N/A

<150 ppm

 

NR

 

NR

 

304 SS

N/A

<400 ppm

 

<250 ppm

 

<150 ppm

 

316 SS

N/A

<1000 ppm

 

<550 ppm

 

<375 ppm

 

Titanium

N/A

>1000 ppm

 

>550 ppm

 

>375 ppm

Erosion and Clogging

 

 

 

 

 

 

 

Particulate Size and

 

<10 ppm of particles and

 

 

 

 

 

Erosion

 

a maximum velocity of

<10 ppm (<1 ppm “sandfree” for reinjection) of particles and a maxi-

 

All

6 fps.

mum velocity of 6 fps. Filtered for maximum 800 micron size. Any par-

 

 

Filtered for maximum

ticulate that is not removed can potentially clog components.

 

 

800 micron size.

 

 

 

 

 

LEGEND

HWG— Hot Water Generator

HX — Heat Exchanger

N/A — Design Limits Not Applicable Consid-

ering Recirculating Potable Water

NR — Application Not Recommended

SS— Stainless Steel

*Heat exchanger materials considered are copper, cupronickel, 304 SS (stainless steel), 316 SS, titanium.

†Closed recirculating system is identified by a closed pressurized piping system.

**Recirculating open wells should observe the open recirculating design considerations.

††If the concentration of these corrosives exceeds the maximum allowable level, then the potential for serious corrosion problems exists.

Sulfides in the water quickly oxidize when exposed to air, requir- ing that no agitation occur as the sample is taken. Unless tested immediately at the site, the sample will require stabilization with a few drops of one Molar zinc acetate solution, allowing accurate sulfide determination up to 24 hours after sampling. A low pH and high alkalinity cause system problems, even when both values are within ranges shown. The term pH refers to the acidity, basicity, or neutrality of the water supply. Below 7.0, the water is considered to be acidic. Above 7.0, water is considered to be basic. Neutral water contains a pH of 7.0.

To convert ppm to grains per gallon, divide by 17. Hardness in mg/l is equivalent to ppm.

UNIT LOAD PIPING — For applications with wide temper- ature variation such as heating/cooling coils:

•Use piping materials that are rated for the maximum tem- perature and pressure combination. This excludes PVC for most heating applications.

•Ensure load water flow in high temperature heating applications is at least 3.2 L/m per kW to improve perfor- mance and reduce nuisance high pressure faults.

•DO NOT employ plastic to metal threaded joints.

•Utilize a pressure tank and air separator vent system to equalize pressure and remove air.

•Employ an 800-micron particulate strainer in both load and source plumbing to protect the plate heat exchanger.

Swimming Pool Hot Tub Applications — Load heat ex- changer should be isolated with secondary heat exchanger constructed of anti-corrosion material in all chlorine/bromine fluid applications.

Potable Water Applications

•Load coax material should always be vented double walled for use in potable water systems.

•Ensure load water flow in high temperature heating applications is at least 3.2 L/m per kW to improve perfor- mance and reduce nuisance high pressure faults.

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Contents Contents Safety ConsiderationsInstallation General50PSW Unit Physical Data 50PSW Electric Access PlugsOverall Cabinet HWG Unit Size50PSW180,360 Unit Teflon* tape thread sealant is recommended to minimize Water Quality Guidelines Condition Closed Open Loop and Recirculating WellRECIRCULATING† Wire Electrical Connections 50PSW Electrical DataMIN/MAX RLA LRA QTY FLA JW1 FP1FP2 LEDDTS AstatComp HpwsHot Water Generator Field Line Voltage Wiring Alarm Relay Contacts Motor SwitchCompressor Field Wiring Terminal Block Compressor Contactor Jumper Wire for Alarm Field Low Voltage WiringTypical Aquazone 50PSW360 Deluxe D Control Wiring, 3-Phase Wire Low Voltage Connections PRE-START-UPDIP Switch Block S2 Accessory 1 Relay Options Complete C Control Jumper Settings See FigDeluxe D Control Jumper Settings See Fig Accessory DIP Switch Position Relay OptionsOperating Limits See Table DIP Switch Block S2 Accessory 2 Relay OptionsSTART-UP Unit Start-UpHeat Exchanger Pressure Drop Unit SizeUnits with Aquazone Deluxe D Control OperationUnits with Aquazone Complete C Control System TestLED Fault Description Code Complete C Control LED Code Fault DescriptionsLED Status Description Alarm Relay Operation Aquazone Deluxe D Control LED IndicaService Description Status LED Test LEDESD Troubleshooting Refrigerant ChargingFP1 and FP2 Thermistor Location Troubleshooting Fault Heating Cooling Possible Cause SolutionCopyright 2010 Carrier Corporation 50PSW START-UP Checklist II. START-UPCLG Heating and Cooling Cycle AnalysisDescription Heating Cooling HTG

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