Boiler And Heating System Piping - NTI Trinity TX Series Installation And Operation Manual

Boiler and Heating System Piping

10.0 BOILER AND HEATING SYSTEM PIPING
The heat exchanger of the Trinity boiler is designed to attain the highest level of heat transfer in a compact
design. To accomplish this, the heating water flows through a series of fin shaped tubes, designed to maximize
the heat transfer area. 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 NTI 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; NTI 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; NTI 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 NTI
warranty and may result in premature heat exchanger failure and property damage.
Table 10-1 Boiler System Cleansers and Corrosion Inhibitors
Application
Boiler Water Treatment
Cleanser for new and old systems
Cleanser for Retrofits
Boiler Water
Pressure - Trinity boilers are intended solely for use in pressurized closed-loop heating systems operating with a
minimum pressure of 12 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 Trinity Tx 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 Trinity Tx boiler must consider the condition of the water in the heating
system. Ensure the condition of the boiler water falls within the following parameters:
 PH – between 7.5 and 9.5.
 Chloride – less than 125mg/l.
 Conductivity – 100 to 300µS/cm (at 25ºC); [TDS 50 to 150ppm or Total Hardness 3 to 9grains/USgal.]
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Fernox Product NTI Part # Description
F1 Protector 83448
F3 Cleaner 83449
DS-40 System Cleaner 83450
Corrosion inhibitor.
Removes flux, grease and carbon residue.
Removes heavy limescale and sludge deposits.
 Iron – less than 0.5mg/l.
 Copper – less than 0.1mg/l.
Tx I&O Manual