Camus Boiler Suggested Water Quality Level

Camus Hydronics Avenger® condensing boilers are suitable for closed loop heating systems. Systems with significant air accumulation due to unknown or unseen leaks must be equipped with a system air separation or pretreatment device.

Untreated drinking water is generally the best heating medium as filling and make-up water for a system that utilizes the Model Avenger. If the water available from the main system is not suitable for use, then demineralization and/or treatment with inhibitors is necessary. Treated filling and make-up water must be checked at least once a year or more frequently if specified in the application guidelines from the inhibitor manufacturer.

Those parts of the boiler in contact with water are manufactured with ferrous materials and corrosion- resistant stainless steel. The chloride content of the heating water should be below 150 ppm. The pH level should be between 7 and 9.5 after six weeks of operation. If the mineral content and dissolved solids become too high, scale forms inside the heat exchanger tubes, reducing heater efficiency and damaging the heater. If the PH levels drop below 6.6 this will cause corrosion of the heat exchanger and severely damage the boiler. PH levels higher than 9.5 can potentially cause lime scale buildup. Heat exchanger damage resulting from chemical imbalance is not covered by warranty.

Table 1-2 gives recommended Avenger water chemistry parameters. Adherence to these limits will help to maintain efficiency and will aid in preventing overheating of the boiler’s heating surfaces. Water quality testing should be conducted prior to installing this appliance and at the time of every scheduled maintenance. It is recommended to flush the entire system to prevent any sediment, debris or any other impurities from ending up inside and harming the appliance. This is done with the boiler isolated from the system.

Water make-up during the lifetime of the boiler should not be greater than 3 times the system volume. A water meter should be installed on the feed line to monitor makeup water volume.

Table 1-2: Model Avenger Water Chemistry

4.1.1- New Installations
A new hydronic system may contain various kinds of debris from the construction process, including weld slag, metal shavings, etc. The piping system should be thoroughly flushed with the boiler isolated from the system to ensure particulates do not enter the boiler.

During this and any subsequent cleaning or flushing of the system, take care to ensure that no debris enters the boiler during the cleaning process. Consult with the installation contractor and/or water treatment provider for filtration recommendations. A pre-start “boil out” of the vessel is not required; the interior boiler surfaces are cleaned following production of the pressure vessel.

4.1.2 – Using Glycol
The Model AVENGER boiler may be operated with a solution of glycol and water. Where glycol is added, the system must first be cleaned and flushed.

When freeze conditions exist ethylene glycol (C2H6O2) and propylene glycol (C3H8O2) can be added to water to provide freeze protection and burst protection. Both glycols have lower thermal conductivity and specific heat capacity values than water making them less efficient in transporting heat when compared to water. For this reason, if no adjustment is made to the system when glycol is added, excess heat can build up withing the heat exchanger which can in turn cause damage and failure to the heat exchanger.