NTI TRX II Series Installation Start-Up Maintenance
  1. Manuals
  2. Brands
  3. NTI Manuals
  4. Boiler
  5. TRX II Series
  6. Installation start-up maintenance

NTI TRX II Series Installation Start-Up Maintenance

Residential condensing gas boiler
Hide thumbs Also See for TRX II Series:
Table of Contents

Advertisement

Quick Links

INSTALLATION
START-UP
MAINTENANCE
TRX085
TRX120
TRX110C
TRX150C models
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

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the TRX II Series and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for NTI TRX II Series

Summary of Contents for NTI TRX II Series

  • Page 1 Series ii Series ii Residential Condensing Gas Boiler INSTALLATION START-UP MAINTENANCE TRX085 TRX120 TRX110C TRX150C models 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 nationally recognized testing agency to conform to UL 353; they Conservation Act, NTI has provided this boiler with multiple features work to shutoff the fuel supply when the system water temperature designed to save energy by reducing the boiler water temperature reaches the preset operating temperature;...

  • Page 5: Table Of Contents

    Table of Contents Part 1 - General Safety Information Part 6 - Installing the Condensate Drain A. Operation and Installation Warnings B. Improper Combustion Part 7 - Connecting Electrical Service C. Gas A. Wiring D. When Servicing the Boiler 1. Removing the Power Cord (To Hard Wire the Boiler) E.
  • Page 6 Table of Contents Part 10 - Start-Up Preparation A. Check / Control Water Chemistry B. Check for Gas Leaks C. Freeze Protection (When Used) D. System Water Fill, Purge, and Test E. Purge Air from DHW System F. Check Thermostat Circuit(s) G.

  • Page 7: 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 8: Improper Combustion

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

  • Page 9: And Dhw Loop Water Chemistry Requirements

    EPA secondary maximum CH applications. 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 10: Water Temperature Adjustment And Scalding

    Part 1 - General Safety Information I. High Elevation Installations CAUTION WARNING On TRX085 / TRX120 Models ONLY If the boiler is to be used only in Heating Mode (not connected Natural gas at high elevation might contain less heating value than to an indirect water heater), the electrical connection of the the typical 1,000 BTU/cu ft and therefore can cause an improper 3-way valve motor MUST BE DISCONNECTED while the boiler...

  • Page 11: Part 2 - Before You Start

    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 12 Part 2 - Before You Start How the Boiler Operates 17 TRX150C / TRX120 TRX condensing technology intelligently delivers hydronic heating while maximizing efficiency. Outlined below are system features and operation: Stainless Steel Heat Exchanger The highly efficient stainless steel heat exchanger is designed to extract all available heat from the supply line before it is exhausted.

  • Page 13: Optional Equipment

    Internal ECM Pump The internal ECM Pump uses less electricity than standard pumps, providing high performance operation. B. Optional Equipment Optional equipment available from NTI (and Part #): • System Sensor(*) (6000084010) (*) One system sensor is required when cascading multiple boilers;...

  • Page 14: 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 The service life of the boiler’s exposed metallic surfaces, such as the very cold location (BELOW 0oF) before installation, handle with care casing, as well as internal surfaces, such as the heat exchanger, are until the components come to room temperature.

  • Page 15: Leveling

    Part 3 - Prepare the Boiler for Installation NOTE: A combustible door or removable panel is acceptable front NOTE: For closet installations, a combustible door or removable clearance. panel is acceptable front clearance. A 3” minimum clearance must be provided from the appliance front cover to the removable panel or B.

  • Page 16: Wall Mounting Considerations

    Part 3 - Prepare the Boiler for Installation Alcove Installations 1. Mounting to a Concrete Wall Alcove installations have the same minimum dimensions as closet Position the paper template on the concrete wall to locate the positions of installations, except the installation must be completely open to the the hanging bracket and piping bracket.

  • Page 17: Mounting To A Wood Studded Wall

    Part 3 - Prepare the Boiler for Installation 2. Mounting to a Wood Studded Wall CAUTION If the boiler is not installed upright, vertically plumb, and level, improper and unsatisfactory operation may occur, causing excessive condensation build-up, nuisance fault codes, and unnecessary ”...

  • Page 18: Residential Garage And Closet Installations

    Part 3 - Prepare the Boiler for Installation Be sure to locate the boiler such that the exhaust vent and intake F. Residential Garage and Closet Installations piping can be routed through the building and properly terminated. Different vent terminals can be used to simplify and eliminate CAUTION multiple penetrations in the building structure (see Optional Equipment in Venting Section).

  • Page 19: Prevent Combustion Air Contamination

    Part 3 - Prepare the Boiler for Installation back-up is installed on each additional level of the dwelling, building, or structure served by the vented gas appliance. It shall be the responsibility of the property owner to secure the service of qualified licensed professionals for the installation of hard wired carbon monoxide detectors.

  • Page 20: Technical Specifications

    Part 3 - Prepare the Boiler for Installation K. Technical Specifications Model TRX085 TRX120 TRX110C TRX150C Type Boiler Combi Installation Indoor, Wall Hung, Fully Condensing Space Heating 9,400 / 85,000 13,200 / 120,000 11,200 / 106,000 13,200 / 120,000 Minimum / Maximum Input (Btu/Hr) Domestic Hot Water 11,200 / 114,000 13,200 / 150,000...
  • Page 21 Part 3 - Prepare the Boiler for Installation 4-3/4” 4-3/4” (120 mm) (120 mm) 15-3/4” (400 mm) 2-9/16” 2-5/8” 2-5/8” 2-9/16” (65mm) (67mm) (67mm) (65mm) 2-3/16” 3-7/16” 3-7/16” 3-7/16” 3-7/16” (55,3mm) 5-7/8” (87,2 mm) (87,6 mm) (87,6 mm) (87,2 mm) (150 mm) 15-5/16”...
  • Page 22 Part 3 - Prepare the Boiler for Installation TRX085 - TRX120 14. CH circuit filter Pressure relief valve 15. Circulation Pump with auto air vent Air purge valve Water pressure switch Boiler outlet temperature sensor 18. Modulating Fan Air pressure switch 19.
  • Page 23 Part 3 - Prepare the Boiler for Installation TRX110C - TRX150C 14. CH circuit filter Pressure relief valve 15. Circulation Pump with auto air vent Air purge valve 16. DHW Flow switch Boiler outlet temperature sensor Water pressure switch Air pressure switch 18.
  • Page 24 Part 3 - Prepare the Boiler for Installation TRX085 - TRX120 TRX110C - TRX150C °F °F Pressure relief valve Air purge valve Boiler outlet temperature sensor Air pressure switch Flue gas temperature sensor Main heat exchanger Flame detection electrode Silencer Junction box 10.

  • Page 25: Part 4 - Water Piping

    Air must remain in the system and return to the tank to provide water. NTI offers indirect water heaters in a wide range of gallon sizes an air cushion. An automatic air vent would cause air to leave the in stainless steel construction.
  • Page 26 Part 4 - Water Piping Connect the 3/4” DHW inlet and outlet pipes. A shut-off valve between the city water supply and DHW inlet is recommended for ease of service. Connect the 1” CH return and supply pipes. Isolation valves are recommended for ease of service. TRX085 or TRX120 only Heating TRX110C TRX085 or TRX120 with Indirect Water Heater...

  • Page 27: Internal Circulation Pump

    Part 4 - Water Piping E. Internal Circulation Pump TRX110C - TRX150C By-pass valve location To calculate the size of the heating installation refer to the graph below. Graph Representing the Available Circulation Pump Head feet Figure 16 - By-Pass Valve Location gal/min Table 11 - Internal Circulation Head Curve Figure 17 - By-Pass Valve Assembly...
  • Page 28 Part 4 - Water Piping CH Loop DHW Loop (Combi Models) This boiler is provided with a CH pressure relief valve that complies The DHW piping must be provided with a DHW pressure relief valve with the ANSI/ASME Boiler and Pressure Vessel Code, Section IV that complies with local codes, but not less than valves certified (Heating Boilers).

  • Page 29: Air Elimination Device

    Part 4 - Water Piping J. Applications* WARNING CAUTION FAILURE TO RE-INSPECT THE RELIEF VALVE AS DIRECTED COULD RESULT IN UNSAFE TEMPERATURE AND/OR PRESSURE BUILD- In mixed temperature applications, a mixing valve is required for the UP WHICH CAN RESULT IN PROPERTY DAMAGE, SERIOUS protection of low temperature loops.
  • Page 30 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 23 - TRX085 / TRX120 with Single Central Heating Circulator NOTE: In piping applications utilizing a single 7.
  • Page 31 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 WATER IMPORTANT: INCREASE FILL EXPANSION TANK MUST BE ON THE PRESSURE TO 20PSI SUPPLY SIDE IN APPLICATIONS WHEN PIPING...
  • Page 32 Part 4 - Water Piping LINE VOLTAGE JUNCTION BOX ZONE 1 ZONE 2 CH PUMP DHW PUMP 120VAC INPUT JUMPER JUMPER INDIRECT FIRED WATER HEATER ZONE #1 ZONE #2 CAP WHEN NOT IN USE MAKE-UP CLOSELY SPACED TEES WATER Figure 25 - TRX085 / TRX120 with Multiple Central Heating Circulators NOTE: In piping applications utilizing a single 6.
  • Page 33 Part 4 - Water Piping LINE VOLTAGE JUNCTION BOX ZONE 1 ZONE 2 CH PUMP DHW PUMP 120VAC INPUT TRANSFORMER JUMPER ZONE #1 ZONE #2 CLOSELY SPACED TEES MAKE-UP WATER Figure 26 - TRX110C / TRX150C with Single Central Heating Circulator NOTE: In piping applications utilizing a single NOTES: zone, it is recommended that the installer...
  • Page 34 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 WATER IMPORTANT: INCREASE FILL EXPANSION TANK MUST BE ON THE PRESSURE TO 20PSI SUPPLY SIDE IN APPLICATIONS WHEN PIPING PIPED DIRECT TO ZONES DIRECT TO ZONES...
  • Page 35 Part 4 - Water Piping LINE VOLTAGE JUNCTION BOX CH PUMP DHW PUMP 120VAC INPUT ZONE 1 ZONE 2 JUMPER JUMPER ZONE #1 ZONE #2 MAKE-UP CLOSELY SPACED TEES WATER CAUTION Figure 28 - TRX110C / TRX150C with Multiple Central Heating Circulators In mixed temperature applications, a mixing valve is required for the protection of low temperature loops.

  • Page 36: 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 37: 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 ONLY ABS* ANSI/ASTM D2661 ANSI/ASTM D2661 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 38: 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 29 - 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 39: Exhaust Vent And Intake Pipe Sizing

    Part 5 - Venting When preparing pipe for installation: E. Exhaust Vent and Intake Pipe Sizing • Ensure cuts are square. 1. The factory ready exhaust vent and intake air pipe diameter is 2”. • Bevel cut edges by 1/16” - 1/8”. Deburr the pipe. •...
  • Page 40 Part 5 - Venting 2. If using the right side connection, remove the gear clamp from the 3. Insert the air intake pipe until it touches the bottom of the fitting. left side connection and install it on the right side. See Figure 33. 4.

  • Page 41: 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. 15. All piping must be fully supported. Use pipe hangers at a...

  • Page 42: Applications

    Vent Supplier Vent Material Availability Description Figure Size Part Number Compatibility Roof Wall 2” 196984 (NTI p/n 85062) 36, 40 IPEX Low Profile (Wall) 3” 196985 (NTI p/n 84357) 36, 40 2” 196125 37, 41, 48, 52 PVC/CPVC IPEX Concentric...
  • Page 43 Part 5 - Venting Sidewall Venting Options - Direct Vent Installation Low Profile Termination Two Pipe 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 44 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 installation instructions. Exhaust Exhaust Exhaust Air-inlet Vertical Air-inlet Air-inlet around Min 18”...
  • Page 45 Part 5 - Venting Snorkel Venting (Two Pipe Sidewall Venting Terminations Venting Below Grade Beneath an Overhang) For installations that exit the wall below grade: 1. Excavate the site to a point where the pipes are to exit as shown in Figure 44.
  • Page 46 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 47 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 Vent pipe piece to retain vent screen pipe illustrated is intended for combustion air intake.

  • Page 48: 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 49: Power Venting, Indoor Combustion Air In Confined Or

    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 50: Part 6 - Installing The Condensate Drain

    9. Route the drain line to a nearby floor drain, laundry tub, or condensate pump. If the boiler condensate outlet is lower than the drain, you must use a condensate removal pump (kit p/n 554200 available from NTI). NOTE: If a nearby laundry tub is used as a disposal for waste water from the washing machine, draining the condensate into this tub allows the soapy water discharge to neutralize the acidic condensate.
  • Page 51 Part 6 - Installing the Condensate Drain NOTES: 1. Condensate line must be pitched at least ¼” per foot to properly drain. If this cannot be done, or a very long length of condensate hose is used, increase the condensate line to a minimum of 1” ID and place a tee in the line after the condensate neutralizer to properly reduce vacuum lock in the drain line.

  • Page 52: Part 7 - Connecting Electrical Service

    Part 7 - Connecting Electrical Service 1. Removing the Power Cord (To Hard Wire the Boiler) WARNING To remove the power cord and hard wire the boiler: Shut off the power supply at the boiler and at the circuit breaker. Install wiring and electrically ground boiler in accordance with the Shut off the gas at the manual shutoff.

  • Page 53: Low Voltage Wiring Connections

    Part 7 - Connecting Electrical Service Leave the plastic connection secured to ensure the cabinet 2. Connecting Power for DHW & CH Pumps (120V) and remains sealed. Zone Outputs (dry contact) Insert the field power cable through the hole in the side panel; To connect power for the CH and DHW external pumps and zone use an appropriate strain relief/conduit hub to secure the cable to loads (pumps or valves) at the boiler junction box:...

  • Page 54: Room Thermostat Wiring Connections

    Part 7 - Connecting Electrical Service 4. Room Thermostat Wiring Connections To connect a room thermostat: 1. Access the low voltage wiring connections by following the directions in Item 3, Low Voltage Wiring Connections. 2. Loosen the cable clamp using a screwdriver and insert the wires leading from the room thermostat.

  • Page 55: Internal Wiring Details

    Part 7 - Connecting Electrical Service B. Internal Wiring Details FUSE 5A CN16 CN22 CN26 CN12 CN20 1 CN19 Figure 69 - Electrical Wiring Diagram TRX Series II - Installation - Startup - Maintenance Instructions...
  • Page 56 Part 7 - Connecting Electrical Service WIFI BOILER PUMP FLAME SENSOR RETURN TEMP. PROBE COMBUSTION BLOWER OUTLET TEMP. PROBE FLUE TEMP. PROBE SPARK GENERATOR AIR PRESSURE SW FLOW METER ACP MAIN BOARD GAS VALVE WATER PRESSURE SENSOR DIVERTER VALVE THERMOSTAT 1 SYSTEM SENSOR TANK SENSOR OUTDOOR SENSOR...
  • Page 57 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 / Hi-V DIVERTER VALVE 120 VAC NEUTRAL (DHW) 120 VAC EXT.
  • Page 58 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 59: 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 60: 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. 1. Remove yellow cap from line pressure test point. See Figure 74. 9.

  • Page 61: Part 9 - Controls

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

  • Page 62: Display Home Page

    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: Home Page ombi 09/28/2023 10:35 Single Boiler 17 psi 66°F 09/28/2023 10:35 Single Boiler 66°F 28=0 124°F...

  • Page 63: 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 64: 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 65: 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 66: 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 67: Time & Date

    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 II - Installation - Startup - Maintenance Instructions...

  • Page 68: Dhw Setup

    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 69: Operating Mode

    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 70: Time Program

    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 71 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 International System Zone 1 Navigate the View/Edit Schedule as follows: US System Zone 2 1.
  • Page 72 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 ENTER. Scheduling 2. Turn the dial to highlight the zone you wish to select and press ENTER. Scheduling Free Time Programming 3.
  • Page 73 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 74: 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 75 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 76 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 77: Dhw Setup

    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 78: Cascade Setup

    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 79: Bms Controls

    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 80: Complete Menu

    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 81: 6B .Complete Menu Parameters

    3 Min percentage 0 - 100 valve when transitioning between the CH and DHW posi- CANNOT BE MODIFIED TRX 085. tions. Consult NTI Technical Support before utilizing. TRX 120. 3 DO NOT USE TRX 110C. 5 DO NOT USE TRX 150C.
  • Page 82 Part 9 - Controls Description Value Description Value Note Note 5 CH Anti-cycle Time 4 DHW Post Purge and 0 = Manual 0 = OFF Mode 1 = Automatic Pump Cycle 1 = ON 6 CH Anti-cycle Time 0 - 7 (minutes) OFF = 3 minutes post-circulation and post-ventilation (when 2.3.5 = 0) after DHW draw-off if the boiler temperature...
  • Page 83 0 Room Setpoint 50 - 86 °F button, the reset command (Comfort) will be executed otherwise, by Only applicable when using an NTI room sensor way of ESC, the orevious page 1 Room Setpoint 32 - 86 °F is shown.
  • Page 84 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 85 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 86 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 87 Part 9 - Controls Description Value Description Value Note Note 1 Error list reset - Clears Do you really want to 19. 1 CONNECTIVITY INFO Error History perform the RESET? If 19. 1. Connectivity status you pressOK button, Initialization the reset command will Idle be executed otherwise, Acess Point initializing...

  • Page 88: Pcb Replacement

    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. 42 BMS 4.

  • Page 89: 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 90: 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 91: 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 92: Part 10 - Start-Up Preparation

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

  • Page 93: System Water Fill, Purge, And Test

    Part 10 - Start-Up Preparation 6. Anti-freeze solutions expand more than water. For example: A 50% WARNING by volume solution expands 4.8% in volume for a temperature increase from 32 - 80 F, while water expands 3% over the same Eliminate all system leaks.
  • Page 94 Part 10 - Start-Up Preparation Part 11 - Start-Up WARNING FOR YOUR OWN SAFETY READ BEFORE OPERATING 1. This boiler does not have a pilot. It is equipped with an ignition device which automatically lights the burner. Do not try to light the burner by hand.

  • Page 95: Part 11 - Start-Up

    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 96: 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 97 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 98 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 99: 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 100: 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 101 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 102: 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 103: 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 104 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 105 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 106 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 107 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 108 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 109 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 110 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 111 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 112 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 113 Part 13 - Troubleshooting Display Possible cause Error Error Error Description Possible Remedies based on priority Type code 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 114 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 115 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 II - Installation - Startup - Maintenance Instructions...

  • Page 116: 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 The boiler must be inspected and serviced annually, preferably at vent or intake pipe openings.

  • Page 117: Maintenance Only To Be Performed By A Qualified Service Technician

    Part 14 - Maintenance 3. If applicable, check the condensate neutralizer and ensure it is full of condensate neutralizing marble chips. C. Maintenance Only to be Performed by a Qualified Service Technician Removing the Cabinet Cover and Inspecting the Boiler Before carrying out any work on the boiler, switch off the power supply at the external power switch and circuit breaker.
  • Page 118 Part 14 - Maintenance Cleaning the Heat Exchanger Combustion Chamber WARNING *Before beginning this procedure, have on hand the following items: • a nylon or other non-metallic brush NEVER use any toxic chemical, including automotive, standard glycol • an FDA approved liquid lime scale remover in a spray bottle antifreeze, or ethylene glycol made for hydronic (non-potable) systems.
  • Page 119 Part 14 - Maintenance 4. Unscrew the two nuts and remove the gas pipe. WARNING Protect the back wall insulation from water before performing any cleaning. Failure to do so could result in damage to the insulation, improper boiler operation, personal injury, or death. 11.
  • Page 120 Part 14 - Maintenance Clean the Condensate Trap 2. Remove the ceramic fiber. 3. Remove the four screws and pull the burner toward you. WARNING NOTE: Whenever replacing the burner, ALWAYS replace the burner gasket. Take care when opening the condensate trap cap, as condensate may escape.

  • Page 121: Replacing Components

    Part 14 - Maintenance CAUTION It is very important that the condensate piping be no smaller than ¾”. To prevent sagging and maintain pitch, condensate piping should be DHW Filter supported with pipe supports, and pitched ¼” per foot to allow for Figure 125 - Removing the DHW Filter proper drainage.
  • Page 122 Part 14 - Maintenance Removing the By-Pass Valve TRX085 and TRX120 The by-pass valve is located in the left hydraulic block. To remove it: Ensure the boiler is drained of water. Remove the securing clip from the valve. Pull the by-pass valve assembly upwards. 1 2 3 Figure 127 - Removed Fan, Bi-Venturi, and Components Legend:...
  • Page 123 Part 14 - Maintenance Replacing the Main Heat Exchanger CAUTION 1. Drain the boiler and remove the combustion assembly as described in Cleaning the Heat Exchanger Combustion Chamber. It is possible to block the overflow valve insert. To do this, remove the 2.

  • Page 124: After Maintenance Is Complete

    Part 14 - Maintenance DANGER Failure to replace the sealing rings will result in exhaust gas leaks, substantial property damage, severe personal injury, or death. Replace the Main PCB Fold down the electronics box. Unlock the two clips and open the electronics box cover. Disconnect the electrical connections.
  • Page 125 Part 14 - Maintenance CAUTION In unusually dirty or dusty conditions, care must be taken to keep boiler cabinet door in place at all times. Failure to do so VOIDS WARRANTY! WARNING Allowing the boiler to operate with a dirty combustion chamber will hurt operation.

  • Page 126: Part 15 - Maintenance Report

    Part 15 - Maintenance Report INSPECTION ACTIVITIES DATE LAST COMPLETED 1 st YEAR 2 nd YEAR 3 rd YEAR 4 th YEAR* PIPING 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 127: Part 16 - Shutdown

    Part 16 - Shutdown A. Shutdown Procedure Supply/Return Temperature Sensors Outdoor Sensor Tank Sensor If the burner is not operating, disconnect the electrical supply. DHW Outlet Sensor If the burner is operating, lower the set point value to 86 F(for high Outside Resistance Water Temp.

  • Page 128: Part 17 - Maintenance Notes

    Part 17 - Maintenance Notes 420012001500 - 03182024 - Rev. 04...
  • Page 129 Part 17 - Maintenance Notes TRX Series II - Installation - Startup - Maintenance Instructions...
  • Page 130 420012001500 - 03182024 - Rev. 04...

  • Page 131: 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 132 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 420012001500 - 03182024 - Rev. 04...

This manual is also suitable for:

Trx085Trx120Trx110cTrx150c

Table of Contents