Trinity
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Installation and Operation Instructions
Tx Series
38
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:
Conductivity – 100 to 300µS/cm (at 25ºC); [TDS 50 to 150ppm or Total Hardness 3 to 9grains/USgal.]
PH – between 7.5 and 9.5.
Chloride – less than 125mg/l.
Iron – less than 0.5mg/l.
Copper – less than 0.1mg/l.
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. NTI
recommends against exceeding 35% concentration of glycol.
DO NOT use inhibited glycol with non-compatible boiler inhibitors. Non-compatible
inhibitors may counteract each other rendering them ineffective.
Near Boiler Plumbing (Central Heating)
Pressure Relief Valve -
A Pressure Relief Valve is factory supplied with each unit. Trinity Tx boilers have a
maximum allowable operating pressure of 45PSI.
The pressure relief valve must be installed at the boiler outlet and in the vertical position, as shown in Figure 10-
1, 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 Gauge –
Trinity Tx units come with a factory supplied Pressure Gauge. The pressure gauge must be
installed at the boiler outlet prior to any circulators. See Figure 10-1.
Low Water Cutoff (LWCO)
– Trinity Tx boilers are provided with a factory installed Water Pressure Sensor.
The sensor provides a readout on the display indicating the inlet water pressure to the boiler; in the event the
pressure drops below 7 PSI, the control will go to a blocking error “Err 59”, inhibiting burner operation. Where
required by the Authority having jurisdiction, an external LWCO may have to be installed.
