Trinity
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Installation and Operation Instructions
Tft Series
40
Near Boiler Plumbing
Tft boilers are intended solely for use in pressurized closed-loop heating systems operating with a minimum
pressure of 12 PSI at the boiler outlet. Carefully follow the instructions and piping diagrams illustrated in this
section.
The Tft 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 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 Figures 10-1 through 10-3.
NOTICE:
Tft boilers have a maximum allowable
operating pressure of 30 PSI (80 PSI for models Tft201-399).
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 –
Tft units come with a factory supplied Pressure and Temperature Gauge.
The gauge must be installed at the boiler outlet prior to any circulators. See Figures 10-1 through 10-3.
Auto Air Vent
– Install the factory supplied auto air vent directly above the outlet fitting on the top of the unit;
see Figures 10-1 through 10-3 illustrating the correct location. 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)
– Tft 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 this 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. Clear the Lockout from the display
board; burner should fire.
3.
With the burner firing, press the TEST 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.
