Ti Series Installation and Operation Instructions
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Trinity
25
Combustion Calibration
- To calibrate burner operation, perform the following procedure using a calibrated combustion
analyzer capable of measuring CO
2
and CO from Natural and Propane Gas burning appliances:
1.
Operate the unit at the maximum modulation rate, see Table 8-2.
2.
Ensure the gas line pressure is maintained within tolerance, see Table 8-1.
3.
While at the maximum Gas Input Value, measure the CO
2
and CO; adjust as necessary, using the Throttle Screw, to be
within the limits listed in Table 8-1.
4.
Operate the unit at the minimum Gas Input Value (Table 8-2). Ensure the combustion remains smooth and CO
2
and CO
remain within the limits (Table 8-1). If not, do not adjust further, contact NTI for assistance.
Maximum Modulation Rate –
The Trinity Ti boiler is equipped with an electronic burner control that will modulate the firing
rate to match the demand placed on the unit. There is no way to force the appliance to operate at the maximum modulation rate;
the unit will automatically determine the modulation rate based on the water temperature and the temperature set points. To help
obtain the maximum modulation rate the following steps should be taken:
1.
Remove the Outdoor sensor wires from the boiler (see Figure 11-1).
2.
Change the HI setting to the maximum safe water temperature that the heating system can handle (see Section 12.0).
3.
Turn on all heating zones and set thermostats to their maximum setting.
Failure to reconnect the Outdoor Sensor may increase fuel consumption. Failure to return the HI setting
to the heating system maximum desired working temperature may result in property damage or excessive
fuel consumption.
Alternate method (DHW with Combi or Indirect Fired Water Heater):
1.
Turn on several hot water fixtures
2.
Set boiler LO setting to 190 (see Section 12.0)
3.
If using a Combi boiler the unit will run and stay at high fire until the taps are turned off.
4.
If using an indirect hot water tank, allow the tank to cool off before turning the boiler on.
Failure to return the LO setting to the desired working temperature may result in excessive fuel
consumption.
See Table 10-3 for recommended settings.
Minimum Modulation Rate
– Like the maximum modulation rate, there is no way to force the Trinity to operate at the minimum
modulation rate. To help obtain the minimum modulation rate follow the steps above for the maximum modulation rate, but
slowly reduce the system water flow rate until the minimum modulation rate is achieved. When using the alternate method (DHW
with Combi or Indirect Fired Water Heater), reduce the LO setting to the minimum value.
Flue Gas Analysis and Adjustment
Each Trinity Ti is factory set to operate with Natural Gas, for appliances field converted to operate with Propane Gas, a flue gas
analysis and adjustment is mandatory. See Table 8-1 and propane conversion instructions.
Failure to perform the flue gas analysis and adjustment detailed in this section may result in erratic and
unreliable burner operation, leading to reduced efficiency, increased fuel consumption, reduced
component life, heat exchanger combustion deposits, and general unsafe operation. Failure to follow these instructions may
result in serious injury or death.
Analysis
– The Trinity Ti is not equipped with an integrated flue gas test port, flue gases must be sampled at the vent termination
or at the condensate drain. When measuring from the termination, ensure the combustion gases are sampled from within the
exhaust pipe by inserting the combustion analyzer probe several inches into the exhaust pipe. When measuring from the
condensate drain, remove the condensate drain trap and insert the combustion analyzer probe into the condensate drain line while
still allowing some flue gases to vent into the room. Perform the flue gas analysis and adjust the gas Throttle/Input Screw as
required until CO
2
and CO levels are within acceptable limits, see Table 8-1. If testing is performed via the condensate drain,
ensure the flue gases are checked immediately to prevent high levels of Carbon Monoxide from entering the room. Once testing
is complete, re-install the condensate drain assembly and check for leaks.
Failure to re-install the condensate drain will result in, property damage, serious injury or death.
