NTI TRX II Series Installation Start-Up Maintenance
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NTI TRX II Series Installation Start-Up Maintenance

Residential condensing gas boiler
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INSTALLATION
START-UP
MAINTENANCE
Models
TRX150
TRX199
TRX199C
NOTICE
The manufacturer reserves the right to make
product changes or updates without notice
and will not be held liable for typographical
errors in literature.
The surfaces of these products contacted by
potable (consumable) water contain less
than 0.25% lead by weight as required by
the Safe Drinking Water Act, Section 1417.
Residential Condensing Gas Boiler
DANGER
THIS MANUAL MUST ONLY BE USED BY A QUALIFIED INSTALLER /
SERVICE TECHNICIAN. READ ALL INSTRUCTIONS IN THIS MANUAL BEFORE
INSTALLING. PERFORM STEPS IN THE GIVEN ORDER. FAILURE TO DO SO
COULD RESULT IN SUBSTANTIAL PROPERTY DAMAGE, SEVERE PERSONAL
INJURY, OR DEATH.
WARNING
Improper installation, adjustment, alteration, service, or maintenance
could void product warranty and cause property damage, severe personal
injury, or death.
California Proposition 65 Warning: This product contains chemicals known
to the State of California to cause cancer, birth defects, or other reproductive
harm.
TRX
TRX
Series ii
Series ii
Heat Exchanger Bears the ASME "H" Stamp

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  • Page 1 Series ii Series ii Residential Condensing Gas Boiler INSTALLATION START-UP MAINTENANCE Models TRX150 TRX199 TRX199C Heat Exchanger Bears the ASME “H” Stamp DANGER NOTICE THIS MANUAL MUST ONLY BE USED BY A QUALIFIED INSTALLER / The manufacturer reserves the right to make product changes or updates without notice SERVICE TECHNICIAN.
  • Page 2 WARNING WARNING: If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, personal injury or death. • Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. WHAT TO DO IF YOU SMELL GAS •...
  • Page 3 SPECIAL ATTENTION BOXES Foreword This manual is intended to be used in conjunction with other literature The following defined terms are used throughout this provided with the boiler. This includes all related control information. manual to bring attention to the presence of hazards of It is important that this manual, all other documents included in various risk levels or to important product information.
  • Page 4 In accordance with Section 325 (f) (3) of the Energy Policy and work to shutoff the fuel supply when the system water temperature Conservation Act, NTI has provided this boiler with multiple reaches the preset operating temperature; and they cause a safety...

  • Page 5: Table Of Contents

    Table of Contents TABLE OF CONTENTS Part 8 - Gas Connections Part 1 - General Safety Information A. Gas Pipe Sizing Tables 1. Gas Pipe Sizing A. Operation and Installation Warnings 2. Natural Gas Pipe Sizing B. Improper Combustion 3. LP (Liquid Propane) Gas Pipe Sizing C.

  • Page 6: Part 1 - General Safety Information

    Part 1 - General Safety Information This boiler is approved for indoor installations only and is not intended WARNING for use as a pool heater. Clearance to combustible materials: 0” top, bottom, sides, and back. Boiler must have room for service: 18” front, This boiler must be installed by a qualified service technician.

  • Page 7: Improper Combustion

    DO NOT alter or modify the appliance or appliance controls. Altering any NTI boiler with parts not manufactured by NTI WILL D. When Servicing the Boiler INSTANTLY VOID the boiler warranty and could result in property damage, personal injury, or death.

  • Page 8: And Dhw Loop Water Chemistry Requirements

    EPA secondary maximum contaminant levels (40 CFR Part 143.3). If the water contains NOTE: NTI DOES NOT WARRANT THE BOILER AGAINST FREEZE- contaminants higher than outlined by the EPA, water treatment is RELATED DAMAGE.

  • Page 9: Water Temperature Adjustment And Scalding

    Part 1 - General Safety Information Table 3 details the relationship of water temperature and time with CAUTION regard to scald injury and may be used as a guide in determining the safest water temperature for your applications. On TRX150 / TRX199 Models ONLY If the boiler is to be used only in Heating Mode (not connected to an indirect water heater), the electrical connection of the 3-way valve motor MUST BE DISCONNECTED while the boiler is operating in...

  • Page 10: Part 2 - Before You Start

    THIS MAN n 1417. John, NB, GE, SEVER TO DO NTI # 420019 author ity having acture r’s instruc be installe the conversion was performed properly. The manu The surfac raphi cal...

  • Page 11: Optional Equipment

    DHW supply temperature to the set point. DHW Flow Meter Monitors DHW flow rate. B. Optional Equipment Optional equipment available from NTI (and Part #): • System Sensor(*) (6000084010) (*) One system sensor is required when cascading multiple boilers;...

  • Page 12: Part 3 - Prepare The Boiler For Installation

    Part 3 - Prepare the Boiler for Installation CAUTION CAUTION COLD WEATHER HANDLING - If the boiler has been stored in a very The service life of the boiler’s exposed metallic surfaces, such as the casing, cold location (BELOW 0oF) before installation, handle with care until as well as internal surfaces, such as the heat exchanger, are directly the components come to room temperature.

  • Page 13: Leveling

    Part 3 - Prepare the Boiler for Installation NOTE: When installing in a zero clearance location, it may not be NOTE: For closet installations, a combustible door or removable possible to read or view some product labeling. It is recommended to panel is acceptable front clearance.

  • Page 14: Wall Mounting Considerations

    Part 3 - Prepare the Boiler for Installation Alcove Installations WARNING Alcove installations have the same minimum dimensions as closet installations, except the installation must be completely open to the This wall mounting system is not seismic rated and should not be room at a distance no greater than 18 in.

  • Page 15: Mounting To A Wood Studded Wall

    Part 3 - Prepare the Boiler for Installation 2. Mounting to a Wood Studded Wall F. Residential Garage and Closet Installations CAUTION CAUTION If the boiler is not installed upright, vertically plumb, and level, Check with your local Authority Having Jurisdiction for requirements improper and unsatisfactory operation may occur, causing excessive when installing boiler in a garage or closet.

  • Page 16: Carbon Monoxide Detectors

    Part 3 - Prepare the Boiler for Installation 1. Direct Vent of Exhaust and Intake H. Carbon Monoxide Detectors If installing a direct vent option, combustion air must be drawn In the Commonwealth of Massachusetts and As Required by State from the outdoors directly into the boiler intake and exhaust must and Local Codes: terminate outdoors.

  • Page 17: Prevent Combustion Air Contamination

    Part 3 - Prepare the Boiler for Installation J. Removing a Boiler from a Common Vent System I. Prevent Combustion Air Contamination Install intake air piping for the boiler as described in the Venting DANGER Section, this manual. Do not terminate exhaust in locations that can allow contamination of intake air.

  • Page 18: Technical Specifications

    Part 3 - Prepare the Boiler for Installation K. Technical Specifications Model TRX150 TRX199 TRX199C Type System Combi Installation Indoor, Wall Hung, Fully Condensing 19,700 / 197,000 19,700 / 197,000 Minimum / Maximum Input (Btu/Hr) 1 15,000 / 150,000 19,200 / 192,000 19,200 / 192,000 DOE AFUE 2 (%) Heating Capacity 1, 2 (MBH)
  • Page 19 Part 3 - Prepare the Boiler for Installation 4 " 4 " 4 " 8 " 8 " 8 " 4 " 2 " 4 " 4 " 3" 8 " 8 " 4 " 3" 2 " Figure 8 - Boiler Dimensions - NOTE: All Dimensions Are Approximate TRX150 and TRX199 TRX199C A - Central Heating Supply...
  • Page 20 Part 3 - Prepare the Boiler for Installation TRX Components Pressure relief valve 13. DHW Flow Sensor (Combi Models Only) 14. Water pressure switch Air purge valve 15. Circulation Pump Boiler outlet temperature sensor 16. Condensate trap Main heat exchanger Modulating Fan Flame detection electrode 18.
  • Page 21 Part 3 - Prepare the Boiler for Installation TRX199C TRX150 and TRX199 °F °F °F °F 16. Condensate trap Pressure relief valve Air purge valve Modulating Fan 18. Boiler inlet temperature Boiler outlet temperature sensor sensor 19. Frame Main heat exchanger 20.

  • Page 22: Part 4 - Water Piping

    SUCH water. NTI offers indirect water heaters in a wide range of gallon sizes FAILURE IS NOT COVERED BY WARRANTY.

  • Page 23: Piping The Boiler

    Part 4 - Water Piping D. Piping the Boiler CAUTION Non-Combi Models should not be operated as a direct potable NOTE: Observe the minimum 1” clearance around all uninsulated hot hot water heater. Only Combi Models should be used to directly water pipes when openings around pipes are not protected by non- heat hot water.

  • Page 24: Internal Circulation Pump

    Part 4 - Water Piping DHW Loop (Combi Models) E. Internal Circulation Pump The DHW piping must be provided with a DHW pressure relief valve To calculate the size of the heating installation refer to the graph below. that complies with local codes, but not less than valves certified as meeting the requirements of Relief Valves for Hot Water Supply Graph Representing the Available Circulation Pump Head Systems, ANSI Z21.22 / CSA4.4 by a nationally recognized lab that...

  • Page 25: Air Elimination Device

    Part 4 - Water Piping WARNING J. Applications* CAUTION FAILURE TO RE-INSPECT THE RELIEF VALVE AS DIRECTED COULD RESULT IN UNSAFE TEMPERATURE AND/OR PRESSURE BUILD-UP WHICH CAN RESULT IN PROPERTY In mixed temperature applications, a mixing valve is required for the DAMAGE, SERIOUS PERSONAL INJURY, OR DEATH.
  • Page 26 Part 4 - Water Piping LINE VOLTAGE JUNCTION BOX ZONE 1 ZONE 2 CH PUMP DHW PUMP 120VAC INPUT TRANSFORMER JUMPER INDIRECT FIRED WATER HEATER CAP WHEN NOT IN USE ZONE #1 ZONE #2 CLOSELY SPACED TEES MAKE-UP WATER Figure 15 - Boiler with Single Central Heating Circulator 8.
  • Page 27 Part 4 - Water Piping LINE VOLTAGE JUNCTION BOX ZONE 1 ZONE 2 CH PUMP DHW PUMP 120VAC INPUT TRANSFORMER JUMPER INDIRECT FIRED WATER HEATER CAP WHEN NOT IN USE ZONE #1 ZONE #2 MAKE-UP WARNING WATER IMPORTANT: For direct (not primary / secondary) piping EXPANSION TANK MUST BE ON THE applications, the expansion vessel must RETURN SIDE IN APPLICATIONS...
  • Page 28 Part 4 - Water Piping LINE VOLTAGE JUNCTION BOX CH PUMP DHW PUMP 120VAC INPUT ZONE 1 ZONE 2 JUMPER JUMPER INDIRECT FIRED WATER HEATER ZONE #1 ZONE #2 CAP WHEN NOT IN USE MAKE-UP CLOSELY SPACED TEES WATER Figure 17 - Boiler with Multiple Central Heating Circulators NOTE: In piping applications utilizing a single WARNING 6.
  • Page 29 Part 4 - Water Piping LINE VOLTAGE JUNCTION BOX ZONE 1 ZONE 2 CH PUMP DHW PUMP 120VAC INPUT TRANSFORMER JUMPER ZONE #1 ZONE #2 MAKE-UP CLOSELY SPACED TEES WATER Figure 18 - Combi Boiler with Single Central Heating Circulator NOTE: In piping applications utilizing a single NOTES: 8.
  • Page 30 Part 4 - Water Piping LINE VOLTAGE JUNCTION BOX ZONE 1 ZONE 2 CH PUMP DHW PUMP 120VAC INPUT TRANSFORMER JUMPER ZONE #1 ZONE #2 WARNING MAKE-UP WATER IMPORTANT: For direct (not primary / secondary) piping applications, the EXPANSION TANK MUST BE ON THE expansion vessel must be placed on the return side of the boiler RETURN SIDE IN APPLICATIONS as illustrated.
  • Page 31 Part 4 - Water Piping LINE VOLTAGE JUNCTION BOX ZONE 1 ZONE 2 CH PUMP DHW PUMP 120VAC INPUT JUMPER JUMPER ZONE #1 ZONE #2 MAKE-UP CLOSELY SPACED TEES WATER CAUTION Figure 20 - Combi Boiler with Multiple Central Heating Circulators In mixed temperature applications, mixing valves are required for the protection of low temperature loops.
  • Page 32 Part 4 - Water Piping KITCHEN SINK BATHROOM SINK BATH LAUNDRY BALL BALL VALVE VALVE DHW SUPPLY FLOW-CHECK VALVE COLD WATER SUPPLY BALL VALVE DRAIN DOMESTIC CIRCUIT RECIRC RETURN SETTER RECIRC PUMP W/BALL VALVES FLOW-CHECK VALVE NOTICE: This illustration is used for piping concept only. Figure 21 - Combi Boiler with Recirculation NOTES: WARNING...

  • Page 33: Part 5 - Venting

    Part 5 - Venting DANGER The boiler must be vented as detailed in this section. Ensure exhaust vent and intake piping complies with these instructions regarding vent system. Inspect finished exhaust vent and intake piping thoroughly to ensure all joints are well secured, airtight, and comply with all applicable code requirements, as well as the instructions provided in this manual.

  • Page 34: Approved Materials For Exhaust Vent And Intake Pipe

    Part 5 - Venting B. Approved Materials for Exhaust Vent and Intake Pipe Standards for Installation In: Item Material United States Canada Pipe and Fittings Approved for Intake ABS* ANSI/ASTM D2661 ANSI/ASTM D2661 ONLY PVC Schedule 40/80 UL-1738 or ANSI/ASTM D1785 PVC-DWV Schedule 40/80 UL-1738 or ANSI/ASTM D2665 UL-1738 or ULC-S636...

  • Page 35: Exhaust Vent And Intake Pipe Location

    Part 5 - Venting D. Exhaust Vent and Intake Pipe Location INSIDE CORNER DETAIL FIXED OPERABLE CLOSED FIXED CLOSED OPERABLE LP-179-CC 03/28/17 Exhaust Vent Terminal Intake Pipe Terminal Area Where Intake Terminal Is Not Permitted Figure 22 - Exit Terminals for Direct Vent Systems - ANSI Z223.1 / NFPA 54 for US and CAN/CSA B149.1 for Canada DESCRIPTION CANADA Clearance above grade, veranda, porch, deck, or balcony...

  • Page 36: Exhaust Vent And Intake Pipe Sizing

    Part 5 - Venting F. Tightening Boiler Collar to Exhaust Vent and E. Exhaust Vent and Intake Pipe Sizing Intake Pipe 1. All models ship with 3” diameter vent pipe exhaust vent and intake Follow the steps to install exhaust vent pipe into the boiler vent air pipe connections.

  • Page 37: Exhaust Vent And Intake Pipe Installation

    The following table lists optional exhaust/intake terminations 14. In vacant chimney applications, install and seal a rain cap over available from NTI: existing chimney openings. Description Stock Code 15. All piping must be fully supported. Use pipe hangers at a minimum of 4 foot intervals to prevent sagging of the pipe where 3”...

  • Page 38: Applications

    Availability Description Figure Size Part Number Compatibility Roof Wall 196984 2” 25, 29 IPEX (or Equivalent) (NTI p/n 85062) Low Profile 196985 (Wall) 7 3” 25, 29 (NTI p/n 84357) PVC/CPVC 2” 196125 26, 30, 37, 41 IPEX (or Equivalent)
  • Page 39 Part 5 - Venting Sidewall Venting Options - Direct Vent Installation Two Pipe Termination Low Profile Termination WARNING WARNING Exhaust must terminate a minimum of 18” above the air intake Exhaust must terminate a minimum of 18” above the air intake termination.
  • Page 40 Part 5 - Venting Sidewall Venting Options - Direct Vent Installation Two Pipe Termination Low Profile Termination WARNING 4 in min Refer to documentation included with termination kit for complete Exhaust installation instructions. Exhaust Exhaust Vertical Air-inlet Air-inlet Min 18” Air-inlet around perimeter Gas Vent Directly...
  • Page 41 Part 5 - Venting Snorkel Venting (Two Pipe Sidewall Venting Terminations Venting Below Grade Beneath an Overhang) For installations that exit the wall below grade: Excavate the site to a point where the pipes are to exit as shown in Figure 33. Ensure the wall is fully sealed where the pipes penetrate.
  • Page 42 Part 5 - Venting Roof Venting Options - Direct Vent Installation Unbalanced Termination (Roof Exhaust / Sidewall Intake) Two Pipe Termination WARNING WARNING Exhaust must terminate a minimum of 18” above the air intake Exhaust must terminate a minimum of 12” above snow level. See termination.
  • Page 43 Part 5 - Venting Roof Venting Options - Direct Vent Installation Unbalanced Venting - Roof Exhaust Termination Two Pipe Termination WARNING Vent screen Exhaust Figure illustrates two options for exhaust termination only. Neither Vent pipe piece to vent pipe illustrated is intended for combustion air intake. retain vent screen Vent pipe piece to Exhaust...

  • Page 44: Venting Through An Existing System

    NOTE: The following instructions refer only to venting through an This boiler may be vented through an existing unused vent system. existing vent system, and not to venting with NTI’s optional concentric The inner diameter of the existing vent system is utilized for the vent kits.

  • Page 45: Power Venting, Indoor Combustion Air In Confined Or Unconfined Space

    Part 5 - Venting 3. Power Venting, Indoor Combustion Air in Confined or INDOOR COMBUSTION AIR Unconfined Space EXHAUST (SINGLE PIPE) This boiler requires fresh, uncontaminated air for safe operation and must be installed in a mechanical room where there is adequate combustion and ventilating air.

  • Page 46: Part 6 - Installing The Condensate Drain

    Part 6 - Installing the Condensate Drain the overflow tee is positioned near a drain or in a location that will not CAUTION damage the surrounding area. 5. Do not reduce the size of the condensate line. The line must at This condensing high efficiency boiler has a condensate removal minimum equal the diameter of the line included with the appliance.

  • Page 47: Part 7 - Connecting Electrical Service

    Part 7 - Connecting Electrical Service 1. Connecting Power for DHW & CH Pumps (120V) and WARNING Zone Outputs (dry contact) To connect power for the CH and DHW external pumps and zone Install wiring and electrically ground boiler in accordance with the loads (pumps or valves) at the boiler junction box: authority having jurisdiction or, in the absence of such an authority, Shut off the power supply at the boiler and at the circuit breaker.

  • Page 48: Room Thermostat Wiring Connections

    Part 7 - Connecting Electrical Service 3. Room Thermostat Wiring Connections Open the control panel cover to have access to the main PCB. See To connect a room thermostat: Figure 50. 1. Access the low voltage wiring connections by following the directions in Item 2, Low Voltage Wiring Connections.

  • Page 49: Internal Wiring Details

    Part 7 - Connecting Electrical Service B. Internal Wiring Details FUSE 5A CN16 CN22 CN26 1 CN19 CN12 CN20 Figure 53 - Electrical Wiring Diagram TRX Series 2 - Installation - Startup - Maintenance Instructions...
  • Page 50 Part 7 - Connecting Electrical Service WIFI BOILER PUMP FLAME SENSOR RETURN TEMP. PROBE COMBUSTION BLOWER OUTLET TEMP. PROBE FLUE TEMP. PROBE SPARK GENERATOR DHW TEMP. PROBE FLOW METER ACP MAIN BOARD GAS VALVE WATER PRESSURE SENSOR DIVERTER VALVE THERMOSTAT 1 SYSTEM SENSOR TANK SENSOR OUTDOOR SENSOR...
  • Page 51 Part 7 - Connecting Electrical Service Connector Description HT Selv No. of Location 120 VAC LIVE INPUT POWER SUPPLY 120 VAC NEUTRAL INPUT HT (120V~) AC PROTECTIVE EARTH 120 VAC EXT. PUMP2 INPUT / 120VAC LINE DIV1 EXTERNAL PUMP 2 / 120 VAC NEUTRAL Hi-V DIVERTER VALVE (DHW) 120 VAC EXT.
  • Page 52 Part 7 - Connecting Electrical Service Connector Description HT Selv No. of Location +24V ROOM THERMOSTAT SELV (24V) ROOM THERMOSTAT 1 SIGNAL NTC SYSTEM CASCADE NTC SENSOR SIGNAL NTC TANK SELV (5V) BOILER NTC SENSOR SIGNAL CN24 OUTDOOR SENSOR OUTDOOR NTC SENSOR SIGNAL +24V ROOM THERMOSTAT 2 SELV (24V)

  • Page 53: Part 8 - Gas Connections

    Part 8 - Gas Connections WARNING WARNING FIRE AND/OR EXPLOSION HAZARD Make sure the gas line pressures are within normal limits. Pressures outside normal limits can result in poor performance and hazardous To avoid serious injury or death, the gas line operating conditions, property damage, personal injury, or death.

  • Page 54: Additional Precaution For Excess Flow Valve (Efv)

    Part 8 - Gas Connections 8. Leak test the gas line pipe before placing the boiler in operation. To check inlet gas pressure: Only use approved leak detector liquid solutions to check for leaks. Remove yellow cap from line pressure test point. See Figure 9.

  • Page 55: Part 9 - Controls

    Part 9 - Controls A. Control Overview B. Display Overview Single Boiler 10/20/2023 20:35 17 psi 66°F Status Outlet: Power: 100 % 10/20/2023 20:35 Single Boiler 17 psi 66°F 158 °F Status Outlet: Power: Demand 158 °F Central Heating F.Signal 125 Target 180°...

  • Page 56: Display - Boiler Status

    192°F Boiler temperature in range Demand Target 180° Boiler temperature in range Part 9 - Controls ombi 09/28/2023 10:35 Single Boiler 66°F C. Display Status DHW: Power: ombi 09/28/2023 Home Page 10:35 Single Boiler 17 psi 66°F 09/28/2023 10:35 Single Boiler 66°F 28=0 124°F...

  • Page 57: Main Menu

    Part 9 - Controls D. Main Menu Main Menu Navigate the Main Menu as follows: Setup wizard 1. From the Home Page, press ENTER. Boiler Details Note: if the display is “asleep”, you will need to press ENTER a 2nd time to access the User Menu Main Menu.

  • Page 58: Setup Wizard

    User Menu Tech menu Test mode Part 9 - Controls Main Menu Insert Code Insert Code Setup wizard E. Setup wizard Boiler Details Insert technical code Insert technical code User Menu Main Menu The Setup Wizard allows for the easy Main Menu Main Menu Main Menu...

  • Page 59: Boiler Details

    Part 9 - Controls F. Boiler Details Main Menu MENU The BOILER DETAILS menu provides the status Setup wizard of each of the boiler’s inputs and outputs. Boiler Details User Menu Navigate the Boiler Details menu as follows: Tech menu 1.

  • Page 60: User Menu

    Part 9 - Controls G. User Menu Main Menu MENU Setup wizard Navigate the User Menu as follows: Boiler Details 1. From the Main Menu, turn the dial to highlight “User Menu” and press ENTER. User Menu 2. Turn the dial to highlight the option you wish to access then press ENTER. Tech menu 3.
  • Page 61 ROOM SETPOINT (HOLIDAY/ANTI-FROST) (4.0.3) Minim Sets the global room temperature setpoint during holiday or inactive periods. Only 41°F applicable when using an NTI Room Sensor. (35-75°F) Table 29 - CH Setup TRX Series 2 - Installation - Startup - Maintenance Instructions...
  • Page 62 Part 9 - Controls 4. User Menu - DHW Setup User Menu User Menu Screen Settings Navigate the DHW Setup menu as follows: Screen Settings Time & Date 1. From the User Menu select “DHW Setup” and press ENTER. Time & Date CH Setup 2.
  • Page 63 Boiler will only operate for Anti-freeze function (if set to Enabled). Holida Holiday Boiler will only run to maintain the room temperatures of zones with NTI Room Sensors at the Holiday setpoint; other CH zones will remain off. DHW will only Holiday...
  • Page 64 Minimum value ROOM SETPOINT (COMFORT) (4.0.0) Room temperature setpoint for selected zone during Comfort time period. 66°F Only applicable when using an NTI Room Sensor. (50-86°F) ROOM SETPOINT (REDUCED) (4.0.1) Zone 1 Operating mode Room temperature setpoint for CH zone 1 during Reduced time period.
  • Page 65 Time & Date System unit of measurament CH Setup Screen brightness DHW Setup Language Part 9 - Controls Operating Mode Time program 6a. User Menu - Time Program - View/Edit Schedule Screen Settings Time Program Navigate the View/Edit Schedule as follows: International System Zone 1 1.
  • Page 66 Part 9 - Controls 6c. User Menu - Time Program - View/Edit Schedule - Wizard time programming Navigate the Wizard Time Programming menu as follows: 1. From the View/Edit Schedule menu select “Wizard Time Programming” and press Scheduling ENTER. Scheduling Free Time Programming me Programming 2.
  • Page 67 Part 9 - Controls 6d. User Menu - Time Program - View/Edit Schedule - PRESET Programs Navigate the Preset Programs menu as follows: Preset Programs - ON time slots 1. From the View/Edit Schedule menu select “Preset Programs” and press 07:00 –...

  • Page 68: Tech Menu

    Boiler Details Zone 2 User Menu AUTO Function (Outdoor Reset) Part 9 - Controls Tech menu General Advanced Settings Test mode H. Tech Menu Technical Area CH Setup Technical Area Tech Menu CH Setup Insert Code Setup wizard Zone 1 Technical Area Setup wizard CH setup...
  • Page 69 Room&Outdoor – the boiler target temperature automatically adjusts between the Min and Max Temperature Settings, based upon the input temperatures provided by an optional NTI Room Sensor AND the included Outdoor Sensor (or Internet Weather via WiFi connection). HEATING CURVE SLOPE (4.2.2) Sets the slope of the heating curve for zone 1.
  • Page 70 Part 9 - Controls continued from the previous page Menu Option | Description (Range Default ZONE 2 Same options as Zone 1 menu but dedicated to Zone 2. Note: parameter numbers for Zone 2 start with “5”. AUTO FUNCTION (OUTDOOR RESET) (2.2.4) Allows the operator to globally enable/disable the Automatic Temperature Control Mode for all zones.
  • Page 71 Part 9 - Controls 2. DHW setup Tech Menu Tech Menu To navigate the DHW Setup menu proceed as follows: CH setup CH setup 1. From the Tech Menu, turn the dial to highlight “DHW Setup” and press ENTER. DHW setup DHW setup 2.
  • Page 72 Part 9 - Controls 3. Cascade Setup NOTICE Tech Menu Tech Menu To navigate the Restore/Backup menu CH setup CH setup proceed as follows: In the case of cascade installation, DHW setup DHW setup 1. From the Tech Menu, turn the dial to Cascade Setup read the manual "Cascade System Cascade Setup...
  • Page 73 Part 9 - Controls 5. BMS Controls Tech Menu Tech Menu DHW setup DHW setup Building Management System. Cascade Setup Cascade Setup Only visible with 0-10V / 4-20mA Clip-In Board installed Restore/Backup Restore/Backup BMS Control BMS Control To navigate the BMS Control menu proceed as follows: Complete Menu Complete Menu 1.
  • Page 74 Part 9 - Controls Tech Menu 6. Complete Menu DHW setup Tech Menu Cascade Setup DHW setup To navigate the Complete Menu proceed as follows: Restore/Backup Cascade Setup 1. From the Tech Menu, turn the dial to highlight “Complete Menu” and press ENTER. BMS Control Restore/Backup 2.
  • Page 75 Function can be utilized to reduce the stroke of the 3-way CANNOT BE MODIFIED TRX 150 valve when transitioning between the CH and DHW posi- TRX 199 tions. Consult NTI Technical Support before utilizing. TRX 199C 3 DO NOT USE RESERVED FOR TECHNICAL ASSISTANCE 5 DO NOT USE Only if the gas or PCB is changed.
  • Page 76 Part 9 - Controls Description Value Description Value Note Note 7 Thermal Cleanse 0 = OFF 4 BOILER CH PARAMETERS - 2 Function 1 = ON 1 Warning pressure da 5.8 a 11.6 psi TRX Non-Combi = Activated when the boiler is connected to a tank by an NTC sensor (Parameter 228 = 1).
  • Page 77 To Reset all parameter settings, press the OK button. (Comfort) WARNING: Always check PCB settings if restoring factory Only applicable when using an NTI room sensor default settings on a replacement controller. Replacement 1 Room Setpoint 32 - 86 °F...
  • Page 78 When the Reset Curve results in a boiler target temperature that is too high or too low (i.e., heats the Only applicable when using an NTI room sensor building too quickly or slowly), Parallel Shift can be used Changes all zones...
  • Page 79 3 Room Setpoint (Holiday/ 36 - 75 °F setpoint Anti-frost) 7 ZONE 3 REGULATION PARAMETERS Only applicable when using an NTI room sensor - Changes 5 Auto Slope Boost 0 = OFF, 1 = ON all zones See description of Parameter 475.
  • Page 80 Part 9 - Controls Description Value Description Value Note Note 2 Auxiliary output setting Heat/Cool request (local zones) 2 BOILER CURRENT STATUS - Read Only External pump (local zones) 1 Fan Status 0 = OFF Alarm 1 = ON Only heat request (local zones) 2 Fan speed RPM Only cool request (local zones) 3 Pump speed...
  • Page 81 Part 9 - Controls Description Value Description Value Note Note 1 Error list reset - Clears Do you really want to 19. 1. SW Upgrade Status Initialization Error History perform the RESET? If Waiting for Update you pressOK button, Updating Micro 1 the reset command will Updating Micro 2 be executed otherwise,...
  • Page 82 Part 9 - Controls 7. PCB Replacement Description Value To navigate the PCB Replacement Menu proceed as follows: 1. From the Tech Menu, turn the dial to highlight “PCB Replacement” and press ENTER. Note 2. Turn the dial to select the parameters and press ENTER. 4.

  • Page 83: Test Mode

    Technical Area CH Setup Setup wizard Zone 1 Part 9 - Controls Boiler Details Zone 2 User Menu AUTO Function (Outdoor Reset) I. TEST MODE Tech menu General Advanced Settings Technical Area CH Setup Technical Area Test mode Setup wizard Zone 1 Setup wizard Navigate the Test Mode menu as follows:...

  • Page 84: Connectivity

    Set to “On” to have the time automatically set via the internet connection based on Signal Level the boiler’s entered address. Note: the address is entered when registering the boiler to an “NTI net” End User or Service Center. INTERNET WEATHER (19.0.4) Connectivity Set to “On”...

  • Page 85: Diagnostics

    User Menu User Menu Version User Menu Maintenance Warning Reset Statistics Enable M Version Maintenance Warning Reset Tech Menu Tech Menu Tech Menu Version Maintena Test Mode Maximum value Test Mode Diagnostics Diagnostics Test Mode Maximum va Diagnostics Diagnostics Minimum value Part 9 - Controls Minimum val Error History...

  • Page 86: Part 10 - Start-Up Preparation

    Part 10 - Start-Up Preparation WARNING B. Check for Gas Leaks WARNING Thoroughly clean and flush any system that has used glycol before installing the boiler. Provide the customer with a material Before starting the boiler, and during initial operation, safety data sheet (MSDS) on the fluid used.

  • Page 87: System Water Fill, Purge, And Test

    Part 10 - Start-Up Preparation 5. The glycol solution should be tested at least once a year or as E. Purge Air from DHW System recommended by the glycol manufacturer. 1. Make sure the CH and DHW lines are open and full of water. Turn 6.

  • Page 88: Condensate Removal

    Part 10 - Start-Up Preparation Part 11 - Start-Up G. Condensate Removal WARNING 1. The boiler is a high efficiency condensing appliance. Therefore, the FOR YOUR OWN SAFETY READ BEFORE OPERATING unit has a condensate drain. Condensate fluid is nothing more than water vapor, derived from combustion products, similar to that 1.

  • Page 89: First Ignition

    Technical Area Output Test Air purge Function Setup wizard Boiler Details Part 11 - Start-Up User Menu 09/28 Tech menu Make sure that the gas supply is valved A. First Ignition NOTE: AIR PURGE FUNCTION off and the boiler is properly connected Test mode To activate the Air purge Function to a 120VAC power supply with...

  • Page 90: Combustion Checking Procedure

    Part 11 - Start-Up WARNING B. Combustion Checking Procedure The order of operations for this procedure must always be respected. It is very important that the combustion system be set within the recommended CO measurements listed in Table 43. Visually OPERATION 1 looking at the burner does not determine combustion quality.
  • Page 91 Part 11 - Start-Up WARNING It is very important that the combustion settings are within the ranges listed in Table 43. Visually looking at the burner does not determine combustion quality. Failure to measure combustion with a calibrated combustion analyzer and set the throttle within the recommended combustion measurements could result in property damage, severe personal injury, or death.
  • Page 92 Part 11 - Start-Up Adjusting the Gas Valve at Min Power (10%) Remove cap and adjust screw 2 by turning counter-clockwise to reduce the CO 2 level; clockwise to increase the CO 2 level (Note: total adjustment should not exceed 1/4 of a turn from factory setting).

  • Page 93: Converting The Appliance From Natural Gas To Propane Operation

    ATTENTION: to Propane Operation LIQUEFIED PETROLEUM (LP) PROPANE NTI boilers are factory set to operate on Natural Gas. Liquefied Petroleum (LP) propane gas is heavier than air; BEFORE OPERATING ON PROPANE the boiler must be converted to therefore, it is imperative that your boiler is not installed in a Propane using the included conversion kit specific to the boiler model.

  • Page 94: Part 12 - Installation Checklist

    Part 12 - Installation Checklist Before Installing Note Is there enough space to ensure proper installation? Does installation location allow for proper service clearances? Are water and gas lines properly sized and set at proper pressures for the installation? Is boiler location as near the exhaust vent / intake pipe terminations as possible? Have combustible materials been cleared from the installation location? Is there a drain close to the boiler? Water Piping...
  • Page 95 Part 12 - Installation Checklist Wiring Note Has the power and control been wired per boiler wiring diagram, this manual? Is the main electrical connection polarity within boiler requirements? Does the power supply voltage agree with the boiler rating plate? 120V AC? Start-Up, Adjust, and Test Note Has the boiler been started?

  • Page 96: Part 13 - Troubleshooting

    Part 13 - Troubleshooting 2. Lockout Error A. Boiler Protection Devices A lockout error means the boiler does not return to operation after the The boiler is protected from malfunctioning by means of internal error condition goes away. checks performed by the electronic microprocessor PCB, which stops 10/20/2023 19:57 Single Boiler...

  • Page 97: Boiler Error Codes

    Part 13 - Troubleshooting B. Boiler Error Codes Possible cause Error Display Error code Error Description Possible Remedies based on priority Type CH Circuit Reset the error by tapping the reset button Ensure boiler is free of air and pressurized to at least Air in the system 20PSI Return filter plugged...
  • Page 98 Part 13 - Troubleshooting Possible cause Error Display Error code Error Description Possible Remedies based on priority Type Reset the error by tapping the reset button. Ensure boiler is free of air and pressurized to at least Air in the system 20PSI.
  • Page 99 Part 13 - Troubleshooting Possible cause Error Display Error code Error Description Possible Remedies based on priority Type Reset the error by tapping the reset button Ensure boiler is free of air and pressurized to at least Air in the system 20PSI If the problem occurs during heating and hot water Failed internal circulator/...
  • Page 100 Part 13 - Troubleshooting Possible cause Error Display Error code Error Description Possible Remedies based on priority Type Ensure the return sensor (near the bottom of the heat Temperature sensor exchanger) is connected to the two blue wires and it disconnected securely clipped on the outlet pipe.
  • Page 101 Part 13 - Troubleshooting Possible cause Error Display Error code Error Description Possible Remedies based on priority Type In systems with high and low temperature zones this The return temperature Normal operation error may be displayed for serval minutes as zones exceeded the supply turn on and off.
  • Page 102 Part 13 - Troubleshooting Possible cause Error Display Error code Error Description Possible Remedies based on priority Type Switch the boiler OFF and ON at the main electrical power supply. Check Menu 2.5.7 0 = OFF , 1 = ON. Setting 2.10.1 Improper settings must be set to 179 when 2.5.7 = 1.
  • Page 103 Part 13 - Troubleshooting Possible cause Error Display Error code Error Description Possible Remedies based on priority Type Reset the error by tapping the Reset button. Incorrect outdoor sensor Disconnect the Outdoor sensor from the PCB and Blocking wiring reset the error. 3 06 PCB internal error (Manual...
  • Page 104 Part 13 - Troubleshooting Possible cause Error Display Error code Error Description Possible Remedies based on priority Type Detected accessory wired to Restore the factory default menu 2.8.0. If the error 4 30 Warning BUS connection persist replace the PCB. Detected accessory wired to Restore the factory default menu 2.8.0.
  • Page 105 Part 13 - Troubleshooting Possible cause Error Display Error code Error Description Possible Remedies based on priority Type Check the flame sensor and wiring for damage,water Blocking Faulty flame sensor or other possible shorts to ground (replace flame Flame detected out of 5 02 (Auto sensor)
  • Page 106 Check the EBUS connection and wires for damage or shorts. EBUS wiring is polarity sensitive and can only EBUS wiring (orange be connected to NTI room sensors, or zone controls, connector) disconnected 0-10VDC clip in module or another EBUS connection on different boiler.
  • Page 107 Part 13 - Troubleshooting Possible cause Error Display Error code Error Description Possible Remedies based on priority Type Two or more boilers in the cascade have the same incorrect settings address. Check menu 0.4.6 and ensure each boiler has a unique address. The control has sensed a short circuit on the BUS BUS connection shorted connection.
  • Page 108 Part 13 - Troubleshooting General Possible cause Symptoms Possible Remedies symptoms based on priority Verify that the boiler call for heat is enabled, and indicated on No thermostat demand the screen of the boiler, the call for heat should be connected to TT1, and or TT2 on the low voltage terminal strip Boiler is in error or lockout, see troubleshooting for the specific Error/ lockout...
  • Page 109 Repeated Lockout Error conditions could indicate a serious error with the boiler or installation. Failure to contact a qualified service technician to troubleshoot the error could result in substantial property damage, serious personal injury, or death. *Error is resettable remotely via NTI Tele-Diagnostic Service, NTI Remote Contractor. TRX Series 2 - Installation - Startup - Maintenance Instructions...

  • Page 110: Part 14 - Maintenance

    Part 14 - Maintenance Check Exhaust Vent and Intake Pipe Terminations DANGER Verify that the boiler exhaust vent and intake pipe terminations are clean and free of obstructions. Remove any debris from the exhaust vent or The boiler must be inspected and serviced annually, preferably at intake pipe openings.

  • Page 111: Maintenance Only To Be Performed By A Qualified Service Technician

    Part 14 - Maintenance C. Maintenance Only to be Performed by a Qualified Check Water and Gas Piping 1. Remove the boiler cover and perform a gas leak inspection Service Technician following Operating Instructions on page 2 of this manual. If gas odor or leak is detected, follow procedures on page 2.
  • Page 112 Part 14 - Maintenance 3. Unscrew the two nuts and remove the gas pipe. WARNING Water drained from the boiler could be scalding hot. Wait for the boiler to cool before draining water, and take precautions when draining water. Failure to do so could result in property damage, personal injury, or death.
  • Page 113 Part 14 - Maintenance 9. Clean the combustion chamber by spraying water or solution into the combustion assembly and monitor the flow through the combustion system. Liquid should flow freely through each tube. If there is an obstruction, increase the flow on the tube to force the blockage out.

  • Page 114: Replacing Components

    Part 14 - Maintenance Clean the filter with a toothbrush and clean running water. WARNING Reinstall the DHW inlet filter. Refill the DHW circuit following the filling and purging Do not install the condensate assembly if a component is lost or instructions in this manual.
  • Page 115 Part 14 - Maintenance Replacing the Fan Replacing the Main Heat Exchanger 1. Remove the silencer and gas line as described in Cleaning the Heat 1. Drain the boiler and remove the combustion assembly as described Exchanger Combustion Chamber. in Cleaning the Heat Exchanger Combustion Chamber. 2.
  • Page 116 Part 14 - Maintenance 8. Remove the six (6) fixing screws from the heat exchanger. If Replacing the Gas Valve accessing the screws on the left part of the heat exchanger is 1. First remove the gas pipe as described in Cleaning the Heat difficult remove the lateral panel.

  • Page 117: After Maintenance Is Complete

    Part 14 - Maintenance E. After Maintenance is Complete CAUTION Functional Test In unusually dirty or dusty conditions, care must be taken to keep After maintenance is complete, ensure the CH circuit is filled and boiler cabinet door in place at all times. Failure to do so VOIDS purged with a pressure of 12 psi.

  • Page 118: Part 15 - Maintenance Report

    Part 15 - Maintenance Report INSPECTION ACTIVITIES DATE LAST COMPLETED 1 st 2 nd 4 th 3 rd PIPING YEAR YEAR YEAR YEAR* Near boiler piping Check boiler and system piping for any sign of leakage. Leaking pipes could cause property damage. Make sure all piping is properly supported. See User’s Information manual for instructions.

  • Page 119: Part 16 - Shutdown

    Part 16 - Shutdown A. Shutdown Procedure Supply/Return Temperature Sensors Outdoor Sensor Tank Sensor Turn the boiler off at the on/off power switch. Wait for the DHW Outlet Sensor combustion blower to stop, so all latent combustion gases are Outside Resist- purged from the system.

  • Page 120: Maintenance Notes

    Maintenance Notes 420012001300 - Rev. 04 - 031524...

  • Page 123: Customer Installation Record Form

    Customer Installation Record Form The following form should be completed by the qualified installer / service technician for you to keep as a record of the installation in case of a warranty claim. After reading the important notes at the bottom of the page, please also sign this document. Customer’s Name Date of Installation Installation Address...
  • Page 124 NTI Boilers Inc. 30 Stonegate Drive Saint John, NB E2H 0A4 Canada Technical Assistance: 1-800-688-2575 Website: www.ntiboilers.com Fax: 1-506-432-1135 Visit us online 420012001300 - Rev. 04 - 031524...

This manual is also suitable for:

Trx150Trx199Trx199c

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