Manual

CHS Series Installation and Operation Instructions │ Slant Fin Corp.
37
10.0 BOILER AND HEATING SYSTEM PIPING
The fire tube design of the CHS heat exchanger results in minimal head loss, however it must be considered
when sizing system piping and circulators. Furthermore, the low mass of the CHS heat exchanger requires a
minimum flow rate anytime the burner is operating. To maintain the efficient and reliable operation of the heat
exchanger, and to avoid heat exchanger failure, it is critical to ensure the rules and guidelines in this section are
followed.
Failure to follow the instructions provided in this section will void the Slant/Fin warranty
and may result in property damage, fire, serious injury or death.
Boiler System Preparation
Prior to connecting plumbing to the boiler, flush the entire system to ensure it is free of sediment, flux, solder,
scale, debris or other impurities that may be harmful to the system and boiler. During the assembly of the
heating system, it is important to keep the inside of the piping free of any debris including construction and
copper dust, sand and dirt.
For retrofits, all system piping, including radiators, must be cleansed of build-up including sludge and scale. All
systems, old and new, must be cleansed to remove flux, grease and carbon residue; Slant/Fin recommends
cleaning the boiler system with “Fernox F3 Cleaner”. For retrofit applications with heavy limescale and sludge
deposits, a heavier duty cleaner may be required; Slant/Fin recommends the use of “Fernox DS-40 System
Cleaner”. For information on performing the cleaning, follow the instructions included with the applicable
Fernox Cleaner. See Table 10-1 for a list of recommended boiler system cleaning and treatment products.
Failure to rid the heating system of the contaminants listed above will void your
Slant/Fin warranty and may result in premature heat exchanger failure and property
damage.
Table 10-1 Boiler System Cleansers and Corrosion Inhibitors
Application
Fernox Product
Slant/Fin Part #
Description
Boiler Water Treatment
F1 Protector
81 8180 000
Corrosion inhibitor.
Cleanser for new and old systems
F3 Cleaner
81 8181 000
Removes flux, grease and carbon residue.
Cleanser for Retrofits
DS-40 Cleaner
81 8182 000
Removes heavy limescale and sludge deposits.
Boiler Water
Pressure - CHS boilers are intended solely for use in pressurized closed-loop heating systems operating with a
minimum pressure of 15 PSI at the boiler outlet. To obtain the minimum system design pressure, follow the
piping diagrams illustrated in this section.
Oxygen Elimination - This boiler may only be installed in a pressurized closed-loop heating system, free of air
and other impurities. To avoid the presence of oxygen, ensure all of the air is removed from the system during
commissioning via strategically placed, adequately sized air-removal devices; located throughout the heating
system. See figures in this section detailing the location of the primary air-removal device required for the
boiler. Immediately repair any leaks in the system plumbing to avoid the addition of make-up water; make-up
water provides a source of oxygen and minerals that may lead to heat exchanger failure. Failure to follow these
instructions will result in poor performance, unnecessary wear of system components and premature failure.
The CHS boiler is not approved for operation in an “open system”, thus it cannot be used
for direct potable water heating or process heating of any kind.
Water Chemistry – The installer of the CHS boiler must consider the condition of the water in the heating
system. Ensure the condition of the boiler water falls within the following parameters:
 Conductivity – less than 400µS/cm (at 25ºC); [TDS < 200ppm or Total Hardness < 11.6grains/USgal.]
 PH – between 6.6 and 8.5.
 Chloride – less than 125mg/l.
 Iron – less than 0.5mg/l.
 Copper – less than 0.1mg/l.