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General| Boiler Type | Condensing |
|---|---|
| Max BTU Input | 101, 000 BTU/h |
| Efficiency | 95% AFUE |
| Fuel Type | Natural Gas or Propane |
| Max BTU Output | 95, 000 BTU/hr |
Indicates a hazardous situation which, if not avoided, will result in serious injury or death.
Indicates a hazardous situation which, if not avoided, could result in serious injury or death.
Indicates a hazardous situation which, if not avoided, could result in minor or moderate injury.
Indicates a hazardous situation which, if not avoided, could result in property damage.
Indicates a hazardous situation which, if not avoided, could result in property damage.
Boiler does not have a pilot; uses an ignition device to light the burner.
Smell around the boiler area for gas, especially near the floor.
Use only hand to turn the gas shutoff valve; do not use tools.
Do not use if any part has been under water; call a technician.
Installation must conform to manual, local authority, and national codes.
User must ensure annual servicing and inspection by a qualified technician.
Ensure installation follows manual/codes and inform user of obligations.
Requirements for horizontally vented gas equipment, including CO detectors and signage.
Lists equipment exempt from specific Massachusetts venting regulations.
Details manufacturer's responsibilities when providing venting system components.
Details manufacturer's responsibilities when venting system is not provided.
All installation instructions, parts lists, and design instructions must remain with the appliance.
De-rating capacity for elevations above 2000 ft and combustion checks.
Requirements for ventilation openings based on clearances and space volume.
Specific requirements for ventilation air openings in closet installations.
Minimum clearances for alcove installations, with conditions for no extra ventilation.
Mounting height and protection requirements for garage installations.
Information on using integrated wall mounting brackets.
Piping combustion air-inlet directly to outdoors for direct vent installation.
Using indoor air for combustion via appliance area and national codes.
Determining size and location for indoor combustion air openings.
Methods for providing outdoor combustion air through openings.
Instructions for connecting PVC/CPVC vent pipe to the exhaust adapter.
Instructions for connecting PPs vent pipe to the exhaust adapter.
Instructions for connecting Stainless Steel vent pipe to the exhaust adapter.
List of optional termination kits available from IPEX, DuraVent, Centrotherm.
Illustration and warning for two-pipe sidewall termination.
Illustration and warning for low profile sidewall termination.
Illustration and warning for concentric sidewall termination.
Illustration and warning for two-pipe roof termination.
Illustration and warning for two-pipe roof/sidewall termination.
Illustration and warning for concentric roof termination.
Details for two-pipe sidewall termination.
Details for IPEX concentric sidewall termination.
Details for IPEX low profile sidewall termination.
Details for PolyPro/InnoFlue sidewall termination.
Details for two-pipe roof termination.
Details for IPEX concentric roof termination.
Details for PolyPro/InnoFlue roof termination.
Details for exhaust-only roof termination.
Ensure vent is located away from normal prevailing winds.
Draw combustion air from an area free of dust and contaminants.
Minimum vertical separation between exhaust and air inlet.
Minimum horizontal distance between inlet and exhaust.
Consider plume of gases and use of a stainless/plastic shield.
Position vent termination away from people, pets, or plants.
Elbows on outside of wall must be no more than 1/2" away from the wall.
Indoor exhaust piping must slope back to the boiler.
Secure vent and air-inlet piping to the wall for rigidity.
In roof applications, discharge must point away from the roof pitch.
Install adequate flashing where pipe enters the roof.
Install and seal a rain cap over existing chimney openings.
Refer to Figure 4-7 for installations exiting the wall below grade.
Install factory supplied vent screens on the outside of the last elbow.
Do not locate vent over public walkways where condensate can freeze.
Install warning plate 'Gas Vent Directly Below' above air-inlet pipe.
Installation guidelines for minimum and maximum wall thickness.
Sidewall venting may not be preferred due to potential moisture loading.
Diagram illustrating sidewall termination clearances.
Seal any unused openings in the common venting system.
Visually inspect the venting system for proper size and pitch.
Close fireplace dampers, doors; turn on exhaust fans.
Place boiler in operation and adjust thermostat for continuous operation.
Test for spillage at the draft hood relief opening.
Ensure each boiler properly vents after removal.
Correct any improper operation to conform to codes.
Instructions for installing the factory supplied condensate trap.
Key installation requirements for gas piping connection and system design.
Critical safety information to read before operating the boiler.
Step-by-step guide for operating the boiler.
Procedure for safely turning off the gas supply to the boiler.
Boiler performs a de-air sequence to purge air from the system.
Turn on power and thermostat to initiate purge and combustion.
Verify gas line pressure is within specified ranges.
Take flue gas sample to ensure it meets acceptable ranges.
Perform at least three ignitions to ensure proper operation.
Unplug flame sensor to test safety system; reinstall and reconfirm ignition.
Procedure to measure gas line pressure for boiler setup.
Adjusting the throttle/input screw for gas flow and CO2 levels.
Calibrating burner operation using a combustion analyzer.
Perform flue gas analysis and adjust throttle/input screw.
Flush system, clean components, and use recommended cleaners/inhibitors.
Consider pressure, oxygen elimination, and water chemistry for boiler water.
Installation and orientation of the pressure relief valve.
Installation of the factory supplied pressure gauge.
Boiler's built-in sensor and requirements for external LWCO.
Treat water with hardness >50 ppm Calcium Carbonate with a Water Softener.
Cleaning brazed plate heat exchangers with weak acid solutions.
How the Tx-Combi heats domestic hot water on demand.
Location of DHW inlet and outlet connections on the Tx-Combi.
Install the factory supplied Y-strainer prior to the inlet fitting.
Recommend check valve in hot water line to prevent backflow.
Use isolation valves to regulate maximum hot water flow rate.
Install drain and isolation valves for servicing.
Provides DHW continuously when flow is present.
Overall flow must be regulated to match boiler's heating ability.
Potential delay in hot water delivery and 'cold water sandwich' effect.
Improves DHW comfort by preheating water, reduces 'cold water sandwich'.
Determine maximum flow rate based on inlet/outlet temperatures.
Turn off power before opening electrical boxes; ensure power remains off.
Use wire grommets to secure wiring and prevent chafing.
Description of wiring connections to the junction box.
Location and purpose of the 3.15 Amp fuse.
Wire boilers in parallel for cascade communication.
Choose one boiler as managing; set S4 switch and control parameters.
Install boilers in parallel in a primary/secondary plumbing configuration.
Checklist for installation steps from gas conversion to wiring.
Steps to follow for boiler start-up after installation.
Verify boiler operation after installation and start-up.
Final checks before leaving the installation site.
Ensure customer receives warranty info and manual.
Checklist for annual inspection of boiler components.
Procedure for cleaning the combustion chamber.
Step-by-step guide for cleaning the combustion chamber.
Recommended PPE for handling refractory ceramic fibers.
Information on refractory ceramic fibers and silica dust.
Information on crystalline silica and its potential health risks.
Boiler display sequence upon initial power-up and de-air sequence.
Displays boiler operating conditions, demand, and status.
Accessing the User Menu by pressing UP or DOWN buttons.
Accessing Installer Menu by pressing MENU and OK simultaneously.
Returning to Main Screen from User or Installer Menu.
Procedure for adjusting settings using UP/DOWN and OK buttons.
Scroll through menu until desired setting number is displayed.
Press OK to access the setting; value will flash if adjustable.
Increase or decrease the setting value.
Repeat process for other settings; hold RESET to exit.
Determines operational mode for central heating.
Inhibits central heat operation above a set outdoor temperature.
Boiler operating temperature for central heat when OD temp is >= 70°F.
Increases boiler target temp for continuous heat demand.
Establishes tank or boiler outlet setpoint for DHW mode.
Determines the operational mode for domestic hot water.
Timer that accumulates during simultaneous DHW and CH demand.
Preheats DHW to reduce wait time and 'cold water sandwich'.
Selects boiler model for controller configuration.
Allows installer to increase minimum modulation/firing rate.
Allows installer to decrease max modulation for central heat.
Allows installer to decrease max modulation for DHW.
Forces max/min modulation for troubleshooting and burner setup.
Indicates when service is due; reset by adjusting setting to 'OFF'.
Length of time boiler pump remains powered after demands end.
Length of time CH pump remains powered after CH demand ends.
Length of time DHW pump remains powered after DHW demand ends.
Assigns unique address for each boiler in a cascade.
Permanent operating temp if communication is lost.
Establishes time between advancement of staging sequence.
Feature not available with first generation Tx boilers.
Feature not available with first generation Tx boilers.
Accumulation of flame outages during run.
Accumulation of successful ignitions.
Accumulation of failed ignition attempts.
Accumulation of hours burner fired for central heating.
Accumulation of hours burner fired for DHW.
Combustion blower operation time at end of burner sequence.
Allows installer to select US or metric units.
Determines power source for igniter spark.
Reduces boiler target temp during 'Night Setback Mode'.
Displays last 16 lockouts and time interval between them.
Displays last 16 blocking errors and time interval between them.
Procedure to navigate and view lockout/error history.
Indicates lockout code, some require RESET button to clear.
Indicates error code; problem must be corrected to clear.
Sensor reading displayed on Main Screen; 'FILL' if below 7 PSI.
Fault in gas valve electrical circuit; check connections.
Fault in safety limit circuit; check external/internal limits.
Check connections, eliminate noise sources, or use UPS.
Contact NTI, check wiring, replace controller.
Invalid reading at Supply/Outlet sensor; check cable, replace sensor.
Blocking error has lasted for 20 consecutive hours.
Fan speed not reaching target speed within 60 seconds.
Contact NTI, check wiring, replace controller.
Excessive temperature reading at Supply/Outlet sensor.
Invalid reading at Flue sensor; check cable, replace sensor.
Verify flame goes out immediately after demand ends.
Check flame sensor, condensate drain, post purge setting.
Contact NTI, check wiring, replace controller.
Flame lost three times during a single demand.
Contact NTI, check wiring, replace controller.
Contact NTI, check wiring, replace controller.
Check electrical connections; ensure thermostat is wired correctly.
Contact NTI, check wiring, replace controller.
Check flame sensor, wiring, condensate drain; replace controller.
Contact NTI, check wiring, replace controller.
Flue temp reading exceeds 220°F or sensor is shorted.
Inlet temp exceeded 203°F; check water flow, sensor, wiring.
Contact NTI, check wiring, replace controller.
Check appliance and power supply grounding.
Sensed reversed polarity of the 120VAC power supply.
Controller accepts 60Hz ± 2%; use UPS if using generator.
Check grounding of boiler and power supply.
Contact NTI, check wiring, replace controller.
Open circuit at supply sensor; check wiring, replace sensor.
Faulty supply sensor; check wiring, replace sensor.
Contact NTI, check wiring, replace controller.
Open circuit at flue sensor; check wiring, replace sensor.
Contact NTI, check wiring, replace controller.
Shorted supply sensor; check wiring, replace sensor.
Shorted supply sensor; check wiring, replace sensor.
Contact NTI, check wiring, replace controller.
Shorted flue sensor; see Err 60.
Inspect reset button; it may be stuck.
Contact NTI, check wiring, replace controller.
Stored appliance type does not match controller.
Contact NTI, check wiring, replace controller.
Short circuit at outdoor sensor; check wiring.
Open circuit at DHW tank sensor; check wiring.
Shorted DHW tank sensor; check wiring.
CH demand inhibited when outdoor temp exceeds WWSD setting.
Reminder for annual service; clear by adjusting menu setting 2-16.
Increase system water pressure to minimum 12 PSI.
Setting determines operating characteristics specific to boiler model.
Steps to replace the boiler controller.
Procedure to change the appliance type setting.
Precautions for servicing the boiler, including disconnecting power.
Steps to diagnose issues when the boiler is not operating.
Troubleshooting steps for a blank display.
Troubleshooting steps when display is normal but no heat is delivered.
Troubleshooting steps when display is normal but no DHW is produced.
Troubleshooting steps when DHW is not hot enough.
Refer to Table 17-3 for error code descriptions.
Refer to Table 19-1 for parts list corresponding to callout numbers.
Information for building owners on obtaining replacement parts.
Contact information for wholesalers ordering replacement parts.
Contact information for installers requiring technical assistance.
