NTI Trinity TX51 Installation And Operation Instructions Manual

NTI Trinity TX51 Installation And Operation Instructions Manual Manual pdf 74 page image

Troubleshooting │ Tx I&O Manual7418.0 TROUBLESHOOTINGObserve the following precautions when servicing the boiler. Failure to comply withthese may result in fire, property damage, serious injury or death.Servicing the Boiler Disconnect or shutoff all energy sources to the boiler: 120VAC power, water and gas. Identify and mark wires before disconnecting or removing them. Never bypass electrical fuses or limit devices except temporarily for testing. Use proper personal protective equipment (PPE) i.e. eye protection, safety footwear.These procedures should only be performed by qualified service personnel, when abnormal operation of theboiler is suspected. The boiler incorporates a sophisticated microprocessor based control which normallyresponds appropriately to varying conditions. If the boiler operation appears to be incorrect, or it is notresponding at all to a demand for heat, the following is suggested to determine and correct the problem.Before undertaking any troubleshooting procedures it is highly recommended to haveavailable a digital multimeter(s) capable of measuring AC and DC volts, Amperes,Resistance (Ohms) and Continuity.Diagnosing an Inoperative Boiler1) Blank Display – perform the following steps: Ensure the boiler service switch located on the front of the boiler is in the ON (1) position. Ensure the main service switch (if applicable) is in the ON position. Ensure the circuit breaker in the electrical panel supplying power to the boiler in on. Measure across boiler terminals 13 and 14 (L1 120VAC and L2 NEUTRAL) for 120VAC, see Figure 12-2.If 120VAC is present, check fuse located on the boiler controller, see Figure 18-1. If 120VAC is not present,check wiring between the boiler and electrical panel for poor connections. Check the electrical connection to the display – connector is located behind display.2) Display Normal but no heat to radiators – perform the following steps: Ensure there is a heat call from the thermostat (radiator symbol on the display will flash during a thermostatdemand). If uncertain about thermostat operation, place a jumper between the boiler’s Thermostat terminals.If the radiator symbol does not display, check outdoor sensor reading (User Menu reading 1-08), andcompare to the warm weather shutdown setting (Installer Menu setting 2-04); central heat call will notactivate if the outdoor temperature is above the warm weather shutdown setting. If the radiator symbol is flashing, but the boiler is not firing, compare the boiler outlet temperature(temperature displayed on the main screen) with the Current target temp (User Menu reading 1-01). Boilerwill not fire until the outlet temperature drops below the Current target temp by the CH setpoint differential(Installer Menu setting 2-02 – default setting = 9ºF).o Ensure the central heating pump(s) is running – if not ensure it is wired to pump output CH PUMP orBOILER PUMP.o If Current target temp is insufficient, increase CH setpoints (Installer Menu settings 2-01 and 2-05). If the radiator symbol is on but not flashing, and the faucet symbol is flashing, then the boiler is activelyservicing a DHW demand; at which time no hot water will go to the radiators. If condition continues,consider increasing the DHW setpoint (Installer Menu setting 2-07), or decreasing the DHW priority time(Installer Menu setting 2-09).3) Display Normal but no DHW – perform the following steps: Tx Combi (Tx151C & Tx200C):o Verify DHW Mode is set to 5 (Installer Menu setting 2-08).o Verify there is DHW flow – check DHW flow rate (User Menu reading 1-05); boiler goes to DHW modewhen the flow exceeds 0.3gpm. If flow is insufficient, check water supply and DHW piping; check Y-strainer for blockage. Check wiring to flow sensor – replace flow sensor if necessary.o Compare DHW setpoint (User Menu reading 1-04) with DHW temp (User Menu reading 1-03); burnerfires when the DHW temp drops below DHW setpoint, if the flow exceeds 0.3gpm. If necessary increase