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Figure 9.8: Isolation of the Boiler from Oxygenated Water with a Plate Heat Exchanger
1.
System containing oxygen - Many hydronic systems contain enough dissolved oxygen to cause severe
corrosion damage to a boiler. Some examples include:
•
Radiant systems that employ tubing without an oxygen barrier.
•
Systems with routine additions of fresh water.
•
Systems which are open to the atmosphere.
If the boiler is to be used in such a system, it must be separated from the oxygenated water being heated
with a heat exchanger as shown in Figure 9.8. Consult the heat exchanger manufacturer for proper heat
exchanger sizing as well as flow and temperature requirements. All components on the oxygenated side of
the heat exchanger, such as the pump and expansion tank, must be designed for use in oxygenated water.
2.
Piping with a Chiller - If the boiler is used in conjunction with a chiller, pipe the boiler and chiller in parallel.
Use isolation valves to prevent chilled water from entering the boiler.
3.
Air Handlers - Where the boiler is connected to air handlers through which refrigerated air passes, use flow
control valves in the boiler piping or other automatic means to prevent gravity circulation during the cooling
cycle.
IX. System Piping
(continued)
D. Piping for Special Situations
Summary of Contents for K2WTC-135
Page 81: ...81 107774 02 4 18 X Domestic Hot Water Piping continued Figure 10 1 Domestic Hot Water Piping...
Page 89: ...89 107774 02 4 18 XI Wiring continued...
Page 90: ...90 107774 02 4 18 Figure 11 8 Internal Wiring Connections Diagram XI Wiring continued...
Page 101: ...101 107774 02 4 18 Lighting and Operating Instructions XII Start Up and Checkout continued...
Page 142: ...142 107774 02 4 18 XVI Repair Parts continued...
Page 145: ...145 107774 02 4 18 XVI Repair Parts continued...
Page 148: ...148 107774 02 4 18 XVI Repair Parts continued...
Page 150: ...150 107774 02 4 18 XVI Repair Parts continued...
Page 152: ...152 107774 02 4 18 XVI Repair Parts continued 120 121 122 123 124 125 126 127...
Page 159: ...159 107774 02 4 18 SERVICE RECORD DATE SERVICE PERFORMED...