Carrier GZ024 Installation Instructions Manual page 5

Table 2 – Water Quality Requirements for Open- -Loop Geothermal Heat Pump System
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 - (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
Langelier Saturation Index
Iron Fouling
Iron Fe² (Ferrous)
(Bacterial Iron Potential)
Iron Fouling
Corrosion Prevention
pH
Hydrogen Sulfide (H S)
2
Ammonia ion as hydroxide,
chloride, nitrate and sulfate
compounds
Maximum Chloride Levels
Erosion and Clogging
Particulate Size and
Erosion
NOTES:
Closed recirculating system is identified by a closed pressurized piping system.
S
Recirculating open wells should observe the open recirculating design considerations.
S
NR - application not recommended
S
"—" No design Maximum
S
HX Material Closed Recirculating
All
All
All
All
All
6 - 8.5
All
Monitor/treat as needed
All
All
Copper
cupronickel
304 SS
316 SS
Titanium
<10 ppm of particles and a
maximum velocity of 1.8 m/s.
All
Filtered for maximum 841 mi-
cron [0.84 mm 20 mesh] size
--
--
--
Based upon 150°F HWG and Direct well,
If Fe²* (ferrous) >0.2 ppm with pH 6-8, O2<5 ppm check
--
--
Minimize steel pipe below 7 and no open tanks with pH <8
At H S>0.2 ppm, avoid use of copper and copper nickel
piping or HXs. Rotten egg smell appears at 0.5 ppm level.
--
Copper alloy (bronze or brass) cast components are OK
--
Maximum Allowable at Maximum Water Temperature
50°F
-- <20 ppm
-- <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
5
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
If <-0.5 minimize steel pipe use.
84°F Indirect Well HX
<0.2 ppm (Ferrous)
for iron bacteria
<0.5 ppm of Oxygen
Above this level deposition will occur
6 - 8.5
to <0.5 ppm
<0.5 ppm
75°F
NR
NR
<250 ppm
<550 ppm
>550 ppm
100°F
NR
NR
<150 ppm
<375 ppm
>375 ppm