SCH Collectors Installation & Operation Manual
7 Maintenance (continued)
Typical properties of Aqueous Solutions+ (Glycol percentage by volume)
Physical | Temp. | 30% Glycol |
| 40% Glycol | 50% Glycol |
Property | °F | Solution |
| Solution | Solution |
|
|
|
|
|
|
Thermal | 40 | 0.247 |
| 0.225 | 0.204 |
Conductivity | 180 | 0.279 |
| 0.249 | 0.221 |
Btu/(hr•ft2)(°F/ft) | 325 | 0.268 |
| 0.238 | 0.210 |
Specific Heat, | 40 | 0.894 |
| 0.847 | 0.794 |
Btu/(lb•°F) | 180 | 0.947 |
| 0.916 | 0.878 |
| 325 | 1.002 |
| 0.987 | 0.965 |
Viscosity, | 40 | 5.75 |
| 9.63 | 14.28 |
Centipoise | 180 | 0.68 |
| 0.85 | 1.08 |
| 325 | 0.31 |
| 0.39 | 0.40 |
Density, | 40 | 65.30 |
| 66.03 | 66.68 |
(lb/ft3) | 180 | 62.60 |
| 63.09 | 63.50 |
| 325 | 57.89 |
| 58.18 | 58.41 |
Solar circuit |
| Collector |
|
| |
1.Verify all system components are correctly installed and operational.
2.Check for leaks - inspect all water lines for signs of leakage and correct any problems found.
3.Check System Pressure - monitor system pressure as the circuit heats up (during testing) to ensure that the pressure does not rise above the designed system pressure. Excessive pressure rise indicates expansion tank sizing or performance problems. See the expansion tank manufacturer’s instruction manual for required maintenance. See the expansion tank manufacturer recommendations for sizing and pressure settings.
4.Check Relief Valve - Inspect the relief valve and lift the lever to verify flow.
Before operating any relief valve ensure WARNING that it is piped with its discharge in a safe
area to avoid severe scald potential.
5.Check Freeze Protection Fluid - ensure that the heat transfer fluid has the proper concentration of glycol as recommended in this manual.
6.Remove any air that may have accumulated in the system.
7.Check Flow Rate - ensure that the minimum recommended flow rate can be achieved as described in this manual.
8.Visually inspect the dirt separator (if installed) and clean if necessary.
1.Visually inspect the collectors to ensure that they are in proper working condition.
2.Visually inspect the collector substructure to ensure that no components have become loose or disconnected.
3.Visually inspect the collector piping to ensure that there are no leaks.
4.Visually inspect roof penetrations to ensure that environmental elements can not enter the building.
5.Visually inspect the piping insulation to ensure the proper orientation around piping.
Pump / control function
1.Check to ensure that the pump station is in working order and creates the minimum flow recommended in this manual.
2.Check control sensors to ensure that they are fully inserted into the appropriate sensing well.
3.See pump manufacturer’s recommendation for required maintenance procedure.
Control settings
1.Check sensor readings to ensure that the values being displayed are accurate.
2.Check control settings to ensure that they are programmed per the control specification.
3.See controller manufacturer’s recommendations for the
required maintenance procedure. | 43 |
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