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Pensotti Heatline Quatech Series
Assembly Instructions
The pump should be mounted on the supply (flow) line. The order of the equipment on the supply
(flow) line should be as follows:
Boiler + Expansion tank + Pump + Valve
A valve must be placed on the return line somewhere very close to the boiler.
Filling of the System with a Sealed Expansion Tank
Filling and draining operations must be carried out, with the boiler shut down and the system cold.
The fill valve is opened and the boiler should start to fill.
The air stuck in water passages should be released via an automatic air elimination device
(Spirotherm or similer) on the boiler would be the best choice. Additionally, all of the radiation in
the heating circuit must be air free.
The safety valve on the boiler, is set to 30PSI. When the circuit is full of water, and the water
pressure exceeds 30 PSI, the safety valve will open to release.
After filling of the entire system (considering also radiators and valves), it must be checked for
leakage.
Boiler Replacement and Service Caution
The replacement of old large cast iron and steel boilers with new modern compact efficient boilers
(sometimes called low mass) can cause problems from corrosion being produced with low
operating water temperatures.
Combustion by-products in fuels produce acidic sulfur oxides that corrode cast iron and steel
surfaces, when the oxides condense in a water solution on the boiler surfaces.
The water dewpoint on the inside surfaces of a boiler is 120°F (49°C) for fuel oil burning and
140°F (60°C) for natural gas.
The fuel dictates the amount of acid compound in the combustion process. However, the presence
of chlorides in the combustion air greatly increases the rate for the production of mild acid
compounds that are very active on cast iron and steel surfaces.
The safest operating temperature range for modern boilers, proven conclusively by tests, is 160°F
(71°C) to 210°F (99°C). Allowing the boiler water temperature to drop below 160°F (71°C) for
extended periods of time is asking for increased rates of corrosion due to the acid becoming more
corrosive due to dilution with water condensate. The rapid production of corrosion and cold flame
temperatures can lead to rapid boiler plugging.
The following step-by-step procedure should be followed for connecting the Pensotti Heatline
Quatech Series boiler to the existing heat distribution system:
Requirements for Piping Circuits - General Requirements
7
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