IOM GMI 2M & 2ML Nov 2010.doc
12
1.7 Freeze Protection
¾ In either an open or a closed loop configuration, the boiler must be isolated before
draining. Due to the radial geometry of the unit, it can only be drained by forced air
method. The operator can connect the forced air through the 3/8” air vent on the
manifold and the drain connection on the 3/8” connection on the other manifold.
¾ For short term storage, the operator can add antifreeze to protect the boiler against
freezing condition. In this case, the boiler or water heater does not need to be
drained. The antifreeze must be compatible with hydronic heating systems.
1.8 Water Treatment
All heat exchanger coils are constructed from high grade stainless steel. Therefore, high oxygen
content in the feed water should not result in any corrosion inside the coils. Since water flow
through coils is in turbulent mode, and they are continuously expanding and contracting; the
operation of the unit is to a large extent self cleaning. Therefore, other potential minerals that may
exist in water should not have any adverse effect (on the tubes). However, if it is wished to supply
soft water to the boiler or water heater, then a sodium-based ion-exchanger may be used. Note that
“soft water” is defined as one having less than 0.12° British, or 0.17° US hardness level. Consult a
local water treatment consultant to determine if water treatment is required.
To Next Page
Loading...