Embassy Peak-40, Инструкция по установке и эксплуатации, Страница: 26 / 68

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WATER PIPING AND CONTROLS
7. A strainer, sediment trap, or some other means for cleaning
the piping system must be provided. It should be located in
the return line upstream of the boiler and must be cleaned
frequently during the initial operation of the system.
Glycol is likely to remove mill scale from new pipe in
new installations.
8. Glycol solution is expensive and leaks should be avoided.
Weld or solder joints should be used where possible and
threaded joints should be avoided. Make-up water should
not be added to the system automatically when glycol
solution is used. Adding make-up water will dilute the
system and reduce the ability of the solution to protect
from freezing.
9. Check local regulations to see if systems containing glycol
solutions must include a back-flow preventer or require
that the glycol system be isolated from the water supply.
10. Do not use galvanized pipe in glycol systems.
11. Use water that is low in mineral content and make sure
that there are no petroleum products in the solution.
a. Less than 50 ppm of calcium
b. Less than 50 ppm of magnesium
c. Less than 100 ppm (5 grains/gallon) of total hardness
d. Less than 25 ppm of chloride
e. Less than 25 ppm of sulfate
12. Check with the local water supplier for chemical
properties of the water.
13. The following test will determine if the water is of the
appropriate hardness. Collect a sample of 50% water
to 50% propylene glycol. Let the solution stand for
8-12 hours shaking it occasionally. If white sediment
forms, the water is too hard and should not be used
to dilute the glycol.
14. Mix the solution at room temperature.
15. Do not use a chromate treatment.
16. Refer to Technical Topics #2a published by the Hydronics
Institute for further glycol system considerations.
NOTICE
pH levels in Glycol systems should be checked annually.
High acidity can cause premature system component
failures.