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WF200
General Boiler System Plumbing
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 5-1 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 5-1 Boiler System Cleansers and Corrosion Inhibitors
Application
Boiler Water Treatment
Cleanser for new and old systems
Cleanser for Retrofits
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. 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 WF200 Wood 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.
Pressure – WF200 Wood Boilers are intended solely for use in pressurized closed-loop heating systems
operating with a minimum pressure of 15 PSI at the boiler outlet.
Pressure Relief Valve – A Pressure Relief Valve is factory supplied with each unit. WF200 boilers have a
maximum allowable operating pressure of 30 PSI. The pressure relief valve must be installed at the top of
the boiler (see Figures 5-1 & 5-3), with no isolation valves between it and the boiler heat exchanger. It must
be oriented in the vertical position, with the drain pipe outlet exiting the side of the pressure relief valve
horizontally and elbowing downward.
If installed in the incorrect orientation (horizontally with drain pipe out the bottom) the
relief valve may not function properly resulting in property damage or personal injury.
Ensure the discharge of the pressure relief is piped to a location where the steam or water
will not cause property damage or serious injury.
Pressure & Temperature Gauge – WF200 boilers come with a factory supplied Pressure and Temperature
Gauge. The gauge must be installed in the fitting provided in the front of the boiler.
Wood Boiler Circulating Pump – A circulating pump is provided with each WF200, install as illustrated in
Figures 5-1 through 5-4, and as per the manufacturer's instructions provided with the pump.
Fernox Product
NTI Part # Description
F1 Protector
83448
F3 Cleaner
83449
DS-40 System Cleaner
83450
Installation and Operation Manual
Corrosion inhibitor.
Removes flux, grease and carbon residue.
Removes heavy limescale and sludge deposits.
9
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