Heat Controller HTS SERIES manual Water Quality Standards

HEAT CONTROLLER, INC. WATER-SOURCE HEAT PUMPS

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Water Quality Standards

Table 4: Water Quality Standards

Water Quality Parameter

HX

Material

Closed

Recirculating

Open Loop and Recirculating Well

Scaling Potential - Primary Measurement

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

pH/Calcium Hardness Method

All

-

pH < 7.5 and Ca Hardness <100ppm

Index Limits for Probable Scaling Situations - (Operation outside these limits is not recommended)

Scaling indexes should be calculated at 66°C for direct use and HWG applications, and at 32°C for indirect HX use. A monitoring plan should be implemented.

Ryznar Stability Index

Langelier Saturation Index

All

All

-

-

6.0 - 7.5

If >7.5 minimize steel pipe use.

-0.5 to +0.5

If <-0.5 minimize steel pipe use. Based upon 66°C HWG and Direct well, 29°C Indirect Well HX

Iron Fouling

Iron Fe 2+ (Ferrous) (Bacterial Iron potential)

Iron Fouling

All

All

-

-

<0.2 ppm (Ferrous)

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

<0.5 ppm of Oxygen

Above this level deposition will occur .

Corrosion Prevention

pH

Hydrogen Sulfide (H2S)

Ammonia ion as hydroxide, chloride, nitrate and sulfate compounds

Maximum

Chloride Levels

All

All

All

Copper

Cupronickel

304SS

316SS

Titanium

6 - 8.5

Monitor/treat as

needed

-

-

-

-

-

-

-

6 - 8.5

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

<0.5 ppm

At H2S>0.2 ppm, avoid use of copper and copper nickel piping or HX's. Rotten egg smell appears at 0.5 ppm level.

Copper alloy (bronze or brass) cast components are OK to <0.5 ppm.

<0.5 ppm

Maximum Allowable at maximum water temperature.

10∃C	24∃C	38 C
<20ppm	NR	NR
<150 ppm	NR	NR
<400 ppm	<250 ppm	<150 ppm
<1000 ppm	<550 ppm	< 375 ppm
>1000 ppm	>550 ppm	>375 ppm

Erosion and Clogging

Particulate Size and

Erosion

All

<10 ppm of particles and a maximum velocity of 1.8 m/s Filtered for maximum 841 micron [0.84 mm, 20 mesh] size.

<10 ppm (<1 ppm "sandfree” for reinjection) of particles and a maximum velocity of 1.8 m/s. Filtered for maximum 841 micron 0.84 mm,

20 mesh] size. Any particulate that is not removed can potentially clog components.

The Water Quality Table provides water quality requirements for coaxial heat exchangers. When water properties are outside of those requirements, an external secondary heat exchanger must be used to isolate the heat pump heat exchanger from the unsuitable water. Failure to do so will void the warranty for the coaxial heat exchanger.

Notes:

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Rev.: 3/22/2012

14 Heat Controller, Inc. Water-Source Heating and Cooling Systems