Water Supply and Quantity — Check water supply. Water supply should be plentiful and of good quality. See Table 2 for water quality guidelines.
IMPORTANT: Failure to comply with the above required water quality and quantity limitations and the closed- system application design requirements may cause damage to the
In all applications, the quality of the water circulated through the heat exchanger must fall within the ranges listed in the Water Quality Guidelines table. Consult a local water treat- ment firm, independent testing facility, or local water authority for specific recommendations to maintain water quality within the published limits.
•Limit piping materials to only polyethylene fusion in the buried sections of the loop.
•Do not use galvanized or steel fittings at any time due to corrosion.
•Avoid all plastic to metal threaded fittings due to the potential to leak. Use a flange fitted substitute.
•Do not overtighten connections.
•Route piping to avoid service access areas to unit.
•Use
Step 8 — Electrical Wiring
To avoid possible injury or death due to electrical shock, open the power supply disconnect switch and secure it in an open position during installation.
Use only copper conductors for
All field installed wiring, including the electrical ground, MUST comply with applicable local, national and regional codes.
Refer to unit wiring diagrams Fig.
Consult the unit wiring diagram located on the inside of the compressor access panel to ensure proper electrical hookup. The installing (or electrical) contractor must make the field connections when using
Operating voltage must be the same voltage and phase as shown in Electrical Data shown in Table 3.
Make all final electrical connections with a length of flexi- ble conduit to minimize vibration and sound transmission to the building.
| Table 2 — Water Quality Guidelines |
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CONDITION | ACCEPTABLE LEVEL |
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pH | 7 to 9 range for copper. Cupronickel may be used in the 5 to 9 range. |
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Total | Calcium and magnesium carbonate should not exceed 350 ppm. |
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Hardness |
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Iron Oxides | Less than 1 ppm. |
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Iron Bacteria | No level allowable. |
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Corrosion* |
| Max Allowable Level | Coaxial Metal |
| Ammonia, Ammonium Hydroxide | 0.5 ppm | Cu |
| Ammonium Chloride, Ammonium Nitrate | 0.5 ppm | Cu |
| Ammonium Sulfate | 0.5 ppm | Cu |
| Chlorine/Chlorides | 0.5 ppm | CuNi |
| Hydrogen Sulfide† | None Allowable | — |
Brackish | Use Cupronickel heat exchanger when concentrations of calcium or sodium chloride are | ||
| greater than 125 ppm are present. (Seawater is approximately 25,000 ppm.) |
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*If the concentration of these corrosives exceeds the maximum allowable level, then the potential for serious cor- rosion problems exists.
†Sulfides in the water quickly oxidize when exposed to air, requiring 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.
NOTE: Hardness in mg/l is equivalent to ppm.
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