Heat Controller HTS SERIES SPLIT SYSTEM, HSS manual Water Quality Standards, Corrosion Prevention

H E AT C O N T R O L L E R , I N C . WAT E R - S O U R C E H E AT P U M P S

R e s i d e n t i a l S p l i t - 6 0 H z R 2 2 & R 4 1 0 A

R e v. : 5 J u n e , 2 0 0 8

Water Quality Standards

Table 3: Water Quality Standards

Water Quality	HX	Closed	Open Loop and Recirculating Well
Parameter	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 Hardness	All	-			pH < 7.5 and Ca Hardness <100ppm
Method
Index Limits for Probable Scaling Situations - (Operation outside these limits is not recommended)
Scaling indexes should be calculated at 150°F [66°C] for direct use and HWG applications,
and at 90°F [32°C] for indirect HX use. A monitoring plan should be implemented.
Ryznar	All		-		6.0 - 7.5
Stability Index					If >7.5 minimize steel pipe use.
Langelier	All	-			-0.5 to +0.5
				If <-0.5 minimize steel pipe use. Based upon 150°F [66°C] HWG and
Saturation Index
						Direct well, 85°F [29°C] Indirect Well HX
Iron Fouling
Iron Fe 2+ (Ferrous)	All		-			<0.2 ppm (Ferrous)
(Bacterial Iron potential)				If Fe2+ (ferrous)>0.2 ppm with pH 6 - 8, O2<5 ppm check for iron bacteria
Iron Fouling	All	-			<0.5 ppm of Oxygen
				Above this level deposition will occur.
Corrosion Prevention
		6 - 8.5			6 - 8.5
pH	All
			Monitor/treat as	Minimize steel pipe below 7 and no open tanks with pH <8
			needed
			-			<0.5 ppm
Hydrogen Sulfide (H2S)	All			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.
Ammonia ion		-
as hydroxide, chloride,	All					<0.5 ppm
nitrate and sulfate
compounds
				Maximum Allowable at maximum water temperature.
				50°F (10°C)		75°F (24°C)	100ϒF (38ϒC)
Maximum	Copper		-	<20ppm		NR	NR
	CuproNickel	-		<150 ppm		NR	NR
Chloride Levels
	304 SS	-		<400 ppm		<250 ppm	<150 ppm
	316 SS	-		<1000 ppm		<550 ppm	< 375 ppm
	Titanium	-		>1000 ppm		>550 ppm	>375 ppm
Erosion and Clogging
			<10 ppm of particles
			and a maximum	<10 ppm (<1 ppm "sandfree" for reinjection) of particlesand a maximum
Particulate Size and	All		velocity of 6 fps [1.8 m/s].	velocity of 6 fps [1.8 m/s]. Filtered for maximum 800 micron [800mm,
Erosion			Filtered for maximum	20 mesh] size.Any particulate that is not removed can potentially
			800 micron [800mm,
				clog components.
			20 mesh] size.
Notes:							Rev.: 03/28/08S

•Closed Recirculating system is identified by a closed pressurized piping system.

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

•NR - Application not recommended.

•"-" No design Maximum.

16 H e a t C o n t r o l l e r, I n c . Wa t e r - S o u r c e H e a t i n g a n d C o o l i n g S y s t e m s