NTI Ti100-200 Installation And Operation Instructions Manual

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NTI Ti100-200 Installation And Operation Instructions Manual Manual pdf 46 page image

Trinity │Installation and Operation Instructions Ti Series4613.0 TROUBLE SHOOTINGThis section is intended to assist the service technician in detecting and correcting common errors. The Sentry 2100 is equippedwith an internal diagnostic system that verifies control operation. The following series of error codes has been developed to aid indiagnosing control problems:Problem Detected Problem SolutionER1On Display“Water TemperatureExcessive”Sentry has sensed a watertemperature in excess of250ºF at the watertemperature thermister.1. If the boiler is extremely hot check for adequate water pressure andcirculation, contact NTI for assistance.2. If not hot, check for sources of grounding or shorting (i.e. water) at thethermister electrical connections, check wiring from Sensor to SentryControl.3. Replace thermister if the resistance is not in the correct range. (Seeresistance charts for 1 M-Ohm Trinity Thermister)ER2On Display“Water TemperatureThermister Short Circuit”Sentry has sensed a shortcircuit in the watertemperature thermister circuit.See ER1.ER3On Display“Water Sensor OpenCircuit”Sentry has sensed an opencircuit in the Water Sensorcircuit.1. Check wiring to Water Sensor for open circuits or shorting to ground(i.e. water). (Note: ER3 will be displayed if temperature sensed is lessthen 0F.)2. Replace Water Sensor if the resistance is not in the correct range. (Seeresistance charts for 1 M- Ohm Trinity Thermister)ER4On Display“24V Limit Error”Sentry has sensed a lack of24V on the outlet of theSentry burner relay (B1).The error locks the boiler out for one hour before retrying ignition.1. Reset power, if error goes away the problem is intermittent and waslikely caused by a tripped limit that has automatically reset, check foradequate water pressure and flow rate. Allow the boiler to cycle andverify proper operation including outlet water temperature and fluetemperature. If operation is unsuccessful and the error reoccurs continueto step 2.2. Ti100-200’s are equipped with a low water pressure switch on the boilerreturn that requires a minimum of 10PSI to complete the 24VACignition circuit. Ensure there is a minimum of 15PSI on the boiler outletprior to the primary circulator; ensure the boiler is plumbed in primary-secondary fashion. Replace water pressure switch if plumbing andpressure is correct and if it measures an open circuit.3. Check for continuity through the 24VAC limit wiring and manifold andstack limits, replace limits or wiring that are not a closed circuit.ER5On Display“DHW Time-Out”The ER5 option is ON and theSentry has sensed that theDHW call has lasted longerthen 2.5 hours, thus removingpriority from the DHW call.Reset the ER5 error by resetting the power or cycling the DHW call. Checkfor proper operation of the DHW call.1. Combi’s are equipped with a DHW flow switch; ensure it is not stickingin the closed position when there is no DHW flow. If so, remove it andfree it of any debris and check for proper operation, replace if necessary.2. For non-Combi boilers, operating with an indirect water heater, checkfor proper boiler water circulation during a DHW call, and check forproper operation of the indirect water heater’s Aqua-stat.3. For applications with prolonged DHW draws, turn the ER5 option OFF.ER6“Flame Lock Out”Sentry has sensed a lack of24V to the gas valve duringoperation or a Fenwal ignitionlockout.There is a problem in the ignition sequence, it could be caused by a faultyigniter, flame sensor, gas valve or improper line pressure or combustion.Check ignition sequence to determine which component is not functioning.(Sentry will retry ignition sequence 1 hour after ER6 code originally occursor if control is reset)If a 3-Flash error occurs on the Fenwal controller prior to locking out on anEr6, proceed to “Three Flashes on Fenwal”.Burner shutsoff beforeset-pointtemperatureis reached(and burnerlight goes out)Reset calculation being usedto lower HI setting.If OD probe is being used, the HI setting will be calculated using formula inSection 12.0, adjust RES setting as necessary.Thermostat is satisfied1. If the thermostat demand light is turning off, the thermostat has satisfied.2. If DHW temp light is turning off; the Aqua-stat or call for DHW hasbeen satisfied.