Water Quality Standards - Rheem RPVS Series Installation, Operation & Maintenance Instructions Manual

R e s i d e n t i a l S p l i t
R e v. : 1 3 M a r c h , 2 0 1 5

Water Quality Standards

Table 3: Water Quality Standards
Water Quality
Parameter
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
Index Limits for Probable Scaling Situations -
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
Iron Fouling
2+
Iron Fe (Ferrous)
(Bacterial Iron potential)
Iron Fouling
Corrosion Prevention
pH
Hydrogen Sulfide (H
2
Ammonia ion as hydroxide, chloride,
nitrate and sulfate compounds
Maximum
Chloride Levels
Erosion and Clogging
Particulate Size and
Erosion
The Water Quality Table provides water quality requirements for ClimateMaster coaxial heat exchangers. The water should be evaluated by an independent testing
facility comparing to this Table and when properties are outside of these 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 and any other components damaged by a leak.
Notes:
14
HX
Material
All
All
All
All
All
All
All
S)
All
Copper
Cupronickel
304 S S
316 SS
Titanium
<10 ppm of particles
and a maximum
velocity of 1.8 m/s
All
Filtered for maximum
841 micron [0.84 mm,
20 mesh] size.
closed pressurized piping system.
Closed
Recirculating
-
(Operation outside these limits is not recommended)
-
-
If <-0.5 minimize steel pipe use. Based upon 66°C HWG and
-
If Fe 2+ (ferrous)>0.2 ppm with pH 6 - 8, O2<5 ppm check for iron bacteria.
-
Above this level deposition will occur .
6 - 8.5
Monitor/treat as
Minimize steel pipe below 7 and no open tanks with pH <8
needed
-
At H S>0.2 ppm, avoid use of copper and copper nickel piping or HX's.
2
Copper alloy (bronze or brass) cast components are OK to <0.5 ppm.
-
Maximum Allowable at maximum water temperature.
10 C
- <20ppm
- <150 ppm
- <400 ppm
- <1000 ppm
- >1000 ppm
<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.
Open Loop and Recirculating Well
pH < 7.5 and Ca Hardness <100ppm
6.0 - 7.5
If >7.5 minimize steel pipe use.
-0.5 to +0.5
Direct well, 29°C Indirect Well HX
<0.2 ppm (Ferrous)
<0.5 ppm of Oxygen
6 - 8.5
<0.5 ppm
Rotten egg smell appears at 0.5 ppm level.
<0.5 ppm
24 C
NR
NR
<250 ppm
<550 ppm
>550 ppm
38 C
NR
NR
<150 ppm
< 375 ppm
>375 ppm