FTG │Installation & Operation Manual
Treatment - Boiler water that falls outside of the conditions listed above must be treated with a corrosion
inhibitor. For information on performing the treatment, follow the instructions included with the corrosion
inhibitor. See Table 10-1 for a list of recommended boiler system cleaners and corrosion inhibitors.
To maintain protection, the level of corrosion inhibitor must be monitored periodically
for the correct concentration.
Anti-freeze - For systems requiring freeze protection, use only inhibited propylene glycol, specially formulated
for hydronic heating systems; use of other types of antifreeze may be harmful to the system and will void the
warranty. Note: the use of glycol may reduce the usable output capacity of the boiler, thus requiring the unit
to be “down-fired” by limiting the maximum operating capacity and/or the maximum water temperature.
DO NOT use inhibited glycol with non-compatible boiler inhibitors. Non-compatible
inhibitors may counteract each other rendering them ineffective.
Near Boiler Piping
Pressure Relief Valve – A Pressure Relief Valve is factory supplied with each unit, and must be field installed
in the vertical position, with the outlet facing horizontally and piped towards the floor away from where it
could be harmful; see Figure 10-1. NOTICE: FTG boilers have a maximum allowable operating pressure of
160 PSI.
If installed in the incorrect orientation (horizontally with outlet pointing down) 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 exiting steam or
hot water will not cause property damage or serious injury.
Pressure & Temperature Gauge – FTG units come with a factory supplied Pressure & Temperature Gauge.
The gauge must be installed in the boiler outlet fitting, as illustrated in Figure 10-1.
Auto Air Vent – An automatic air vent is factory installed on the boiler; see Figure 10-1. Open the auto air
vent’s vent-cap to promote the removal of air during commissioning of the boiler and to avoid
malfunctioning of the LWCO. Once the air is removed from the system, close the vent-cap to prevent water
from leaking onto the boiler.
Low Water Cutoff (LWCO) – FTG boilers are provided with a factory installed LWCO switch which
incorporates a Test Button and Power and Low Water indicator lights. Perform the following Operational
Test Procedure before placing the boiler in service, and ensure Maintenance is carried out with the following
schedule.
Do not run the boiler unattended until the following procedure is completed. Failure to
follow procedure may lead to unsafe boiler operation resulting in fire, property damage
and loss of life.
Operational Test Procedure (LWCO)
1. Before introducing water to the boiler, turn the power on; both the green “POWER” LED and amber “LOW
WATER” LED should illuminate. Generate a burner demand; the burner should not fire and “Lockout 67
ILK OFF” should appear on the screen. Contact NTI for assistance if this does not happen.
2. Fill the boiler with water; the “LOW WATER” LED should turn off. Press the TEST / RESET button on the
LWCO and clear the Lockout from the display board – burner should now fire.
3. With the burner firing, press the TEST / RESET button to simulate a low water condition; the amber “LOW
WATER” LED should illuminate and the burner should turn off.
Maintenance (LWCO)
Every Year – perform Step 3 from the Operational Test Procedure.
Every 5-years – Remove the LWCO and clean all surfaces in contact with water.
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