NTI TRX150 Manual
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NTI TRX150 Manual

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Installation
Start-Up
Maintenance
Parts
Warranty
TRX150 / TRX199
TRX199C Models
86661 Revision Date 2.25.21
Residential Condensing Gas Boiler
Heat Exchanger Bears the ASME "H" Stamp
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.
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.
TRX
TRX

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  • Page 1 Start-Up Maintenance Residential Condensing Gas Boiler Parts Warranty TRX150 / TRX199 TRX199C Models Heat Exchanger Bears the ASME “H” Stamp DANGER THIS MANUAL MUST ONLY BE USED BY A QUALIFIED INSTALLER / SERVICE TECHNICIAN. READ ALL INSTRUCTIONS IN THIS MANUAL BEFORE INSTALLING.
  • 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 Installation should be made in accordance with the regulations of the Authority Having Jurisdiction, local code authorities, and utility The following defined terms are used throughout this companies which pertain to this type of water heating equipment. manual to bring attention to the presence of hazards of Authority Having Jurisdiction (AHJ) –...
  • 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 2. Natural Gas Pipe Sizing 3. LP (Liquid Propane) Gas Pipe Sizing Part 1 - General Safety Information B. Gas Connection Requirements A. Operation and Installation Warnings C. Additional Precaution for Excess Flow Valve (EFV) B. Improper Combustion D.

  • Page 6: Operation And Installation Warnings

    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

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

  • Page 8: And Dhw Loop Water Chemistry Requirements

    Potable water is defined as drinkable CH applications. water supplied from utility or well water in compliance with EPA NOTE: NTI DOES NOT WARRANT THE BOILER AGAINST FREEZE-RELATED secondary maximum contaminant levels (40 CFR Part 143.3). If DAMAGE.

  • Page 9: Water Temperature Adjustment And Scalding

    This boiler is designed to operate at its maximum listed capacity in installations located at 0 - 2000 ft above Sea Level. Since the density On TRX150 / TRX199 Models ONLY of air decreases as elevation increases, maximum specified capacity...

  • Page 10: Part 2 - Before You Start

    Part 2 - Before You Start How the Boiler Operates NOTICE TRX condensing technology intelligently delivers hydronic heating while maximizing efficiency. Outlined below are system features and operation: UNCRATING THE BOILER - Any claims for damage or shortage in Stainless Steel Heat Exchanger shipment must be filed immediately against the transportation The highly efficient stainless steel heat exchanger is designed to company by the consignee.

  • Page 11: Optional Equipment

    Monitors DHW outlet temperature. The control adjusts boiler firing rate to match the 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 (84010) • 3” PVC Concentric Vent Kit (84634) •...

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

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

  • Page 13: Leveling

    Part 3 - Prepare the Boiler for Installation Part 1 - General Safety Information NOTE: For closet installations, a combustible door or removable NOTE: When installing in a zero clearance location, it may not be panel is acceptable front clearance. A 3” minimum clearance must be possible to read or view some product labeling.

  • Page 14: Wall Mounting Considerations

    Part 3 - Prepare the Boiler for Installation Part 1 - General Safety Information D. Wall Mounting Considerations These boilers are wall mounted. Use only the wall mounting instructions included with this boiler. Ensure the wall that the boiler is intended to be mounted on is comprised of cement, brick, block, or wooden studs spaced 16”...

  • Page 15: 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 multiple CAUTION penetrations in the building structure (see Optional Equipment in Venting Section).

  • Page 16: Prevent Combustion Air Contamination

    Part 3 - Prepare the Boiler for Installation property owner to secure the service of qualified licensed professionals J. Removing a Boiler from a Common Vent System for the installation of hard wired carbon monoxide detectors. a. In the event that the vented gas fueled appliance is installed in a DANGER crawl space or attic, the hard wired carbon monoxide detector with alarm and battery back-up shall be installed on the next adjacent...

  • Page 17: Technical Specifications

    Part 3 - Prepare the Boiler for Installation Part 1 - General Safety Information K. Technical Specifications Model TRX150 TRX199 TRX199C Type Boiler Combi Installation Indoor, Wall Hung, Fully Condensing 19,700 / 197,000 19,700 / 197,000 Minimum / Maximum Input (Btu/Hr)
  • Page 18 8 " 4 " 3" 2 " Figure 6 - Boiler Dimensions - NOTE: All Dimensions Are Approximate Model TRX150 and TRX199 Model TRX199C A - Central Heating Supply 1 1/4” NPT A - Central Heating Supply 1 1/4” NPT...
  • Page 19 Part 3 - Prepare the Boiler for Installation Part 1 - General Safety Information TRX Components Pressure relief valve Circulation Pump Air purge valve DHW Flow Sensor (Combi Models Only) Boiler outlet temperature sensor Water pressure switch Air pressure switch Modulating Fan Flue gas temperature sensor Boiler inlet temperature sensor...
  • Page 20 Part 3 - Prepare the Boiler for Installation Part 1 - General Safety Information TRX199C TRX150 and TRX199 Pressure relief valve Air purge valve Boiler outlet temperature sensor DHW Temperature Sensor Flue gas temperature sensor Main heat exchanger Flame detection electrode...

  • Page 21: Part 4 - Water Piping

    An automatic air vent would cause air to leave be connected to an indirect water heater to supply domestic hot water. NTI offers indirect water heaters in a wide range of gallon sizes the system, resulting in improper operation of the expansion tank.
  • Page 22 Part 4 - Water Piping Part 1 - General Safety Information TRX150 and TRX199 TRX199C A. CH Supply 1-1/4” A. CH Supply 1-1/4” B. Supply to Indirect Water Heater 3/4" (Cap if not in use) B. DHW Outlet 3/4" C. Gas Inlet 3/4"...

  • Page 23: Internal Circulation Pump

    Part 1 - General Safety Information Part 4 - Water Piping E. Internal Circulation Pump To calculate the size of the heating installation refer to the graph below. Graph Representing the Available Circulation Pump Head Available Head vs. Flow Rate Flow Rate [US GPM] Table 11 - Internal Circulation Head Curve...

  • Page 24: And Dhw Pressure Relief Valves

    Part 4 - Water Piping Part 1 - General Safety Information WARNING F. CH and DHW Pressure Relief Valves This boiler has a high-temperature shut-off switch built in as a standard safety feature. Therefore, a “pressure only” relief valve is required. To avoid water damage or scalding due to relief valve operation: DO NOT operate this appliance before the supplied pressure relief •...

  • Page 25: Air Elimination Device

    Part 1 - General Safety Information Part 4 - Water Piping G. Air Elimination Device A micro bubble air elimination device must be installed in every boiler installation. Automatic air vents alone are not an acceptable substitute for a micro bubble air elimination device. Here are a few examples of acceptable devices.
  • Page 26 3. A minimum of 6 pipe diameters of straight pipe shall be installed Figure illustrates the basic plumbing requirements for a TRX150 / upstream and downstream of all closely spaced tees. TRX199 boiler installation utilizing Primary/Secondary piping when 4.
  • Page 27 NOTES: 1. This drawing is meant to show system piping concept only. Figure illustrates the basic plumbing requirements for a TRX150 Installer is responsible for all equipment and detailing required by / TRX199 boiler installation without an external Central Heating local codes.
  • Page 28 3. A minimum of 6 pipe diameters of straight pipe shall be installed Figure illustrates the basic plumbing requirements for a TRX150 / upstream and downstream of all closely spaced tees. TRX199 boiler installation utilizing Primary/Secondary piping when 4.
  • Page 29 Part 1 - General Safety Information Part 4 - Water Piping Primary/Secondary Piping Shown - See Note 2 Figure 16 - Combi Boiler with Single Central Heating Circulator NOTE: In piping applications utilizing a single zone, it is recommended NOTES: that the installer use flow / check valves with weighted seats at or near 1.
  • Page 30 Part 4 - Water Piping Part 1 - General Safety Information WARNING For direct (not primary / secondary) piping applications, the expansion vessel must be placed on the return side of the boiler as illustrated. Placement of flow resticting devices, such as check valves, is prohibited between the boiler return and the expansion vessel.
  • Page 31 Part 1 - General Safety Information Part 4 - Water Piping CAUTION In mixed temperature applications, mixing valves are required for the protection of low temperature loops. Primary/Secondary Piping Shown - See Note 2 Figure 18 - Combi Boiler with Multiple Central Heating Circulators NOTES: NOTE: In piping applications utilizing a single zone, it is recommended 1.

  • Page 32: Floor Drying Function

    Part 4 - Water Piping Part 1 - General Safety Information J. Floor Drying Function The Floor Drying Function is a special function that allows the installer, through a dedicated heating cycle, to use the boiler for drying a freshly poured radiant floor during a floor system installation.

  • Page 33: Part 5 - Venting

    Part 1 - General Safety Information 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 Part 1 - General Safety Information 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...

  • Page 35: Exhaust Vent And Intake Pipe Location

    Part 1 - General Safety Information 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 19 - Exit Terminals for Direct Vent Systems - ANSI Z223.1 / NFPA 54 for US and CAN/CSA B149.1 for Canada DESCRIPTION CANADA...

  • Page 36: Exhaust Vent And Intake Pipe Sizing

    Part 5 - Venting Part 1 - General Safety Information 1. Push the length of pipe into the connection until it touches the E. Exhaust Vent and Intake Pipe Sizing bottom of the fitting. 1. All models ship with 3” diameter vent pipe exhaust vent and intake 2.
  • Page 37 The following table lists optional exhaust/intake terminations available 14. In vacant chimney applications, install and seal a rain cap over 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 Vent Supplier Vent Material Description Figure Size Part Number Compatibility Roof Wall 2” 196984 (NTI p/n 85062) 23, 27 IPEX (or Equivalent) Low Profile (Wall) 3” 196985 (NTI p/n 84357) 23, 27 2” 196125 24, 28, 35, 39 PVC/CPVC IPEX (or Equivalent) Concentric...

  • Page 39: Applications

    Part 1 - General Safety Information Part 5 - Venting H. Applications 1. Direct Vent Installation of Exhaust and Intake If installing a direct vent option, combustion air must be drawn from the outdoors directly into the boiler intake, and exhaust must terminate outside.
  • Page 40 Part 5 - Venting Part 1 - General Safety Information 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 41 Part 1 - General Safety Information Part 5 - Venting Sidewall Venting Options - Direct Vent Installation Low Profile Termination Two Pipe Termination WARNING 4 in min. Refer to documentation included with termination kit for complete installation instructions. Gas Vent Gas Vent Directly Directly Below Keep Free of...
  • Page 42 Part 5 - Venting Part 1 - General Safety Information 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 31.
  • Page 43 Part 1 - General Safety Information 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 12” above snow level. See Figure Exhaust must terminate a minimum of 18”...
  • Page 44 Part 5 - Venting Part 1 - General Safety Information Roof Venting Options - Direct Vent Installation Unbalanced Venting - Roof Exhaust Termination Two Pipe Termination WARNING Figure illustrates two options for exhaust termination only. Neither vent pipe illustrated is intended for combustion air intake. 4 in min.

  • Page 45: 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 46: Power Venting, Indoor Combustion Air In Confined Or Unconfined Space

    Part 5 - Venting Part 1 - General Safety Information 3. Power Venting, Indoor Combustion Air in Confined or Unconfined Space 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 47 Part 1 - General Safety Information Part 6 - Installing the Condensate Drain CAUTION condensate backing up into the boiler if the tube should kink. Ensure the overflow tee is positioned near a drain or in a location that will not damage the surrounding area.

  • Page 48: Part 7 - Connecting Electrical Service

    Part 1 - General Safety Information Part 7 - Connecting Electrical Service NOTE: For additional electrical protection, the use of a whole house WARNING surge protector is recommended. Damage caused by power surges IS NOT covered by the warranty. Install wiring and electrically ground boiler in accordance with the 1.

  • Page 49: Room Thermostat Wiring Connections

    Part 7 - Connecting Electrical Service Part 1 - General Safety Information 3. Room Thermostat Wiring Connections Open the control panel cover to have access to the main PCB. See Figure 48. To connect a room thermostat: 1. Access the low voltage wiring connections by following the directions in Item 2, Low Voltage Wiring Connections.

  • Page 50: Internal Wiring Details

    Part 7 - Connecting Electrical Service Part 1 - General Safety Information B. Internal Wiring Details POWER-IN DHW PUMP FUSE 5AT FUSE 5A CN16 CN22 CN26 CN12 CN20 CN19 Figure 51 - Electrical Wiring Diagram...
  • Page 51 Part 7 - Connecting Electrical Service Part 1 - General Safety Information Figure 52 - Ladder Diagram...
  • Page 52 Part 7 - Connecting Electrical Service Part 1 - General Safety Information 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)
  • Page 53 Part 7 - Connecting Electrical Service Part 1 - General Safety Information 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...

  • Page 54: Part 8 - Gas Connections

    Part 1 - General Safety Information 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 55: Additional Precaution For Excess Flow Valve (Efv)

    Part 1 - General Safety Information Part 8 - Gas Connections 7. Use a manometer to test the gas pressure to make sure it meets the To check inlet gas pressure: minimum standards and does not exceed the maximum standards Remove yellow cap from line pressure test point.

  • Page 56: Part 9 - Controls

    Part 1 - General Safety Information Part 9 - Controls A. Control and Display Overview AUTO COMFORT ON OFF MENU PAR CODE 7 8 9 Display Icon Description Digits Indicating: Figure 57 - Control and Display Overview • Boiler Status •...

  • Page 57: Ignition Procedure

    Part 1 - General Safety Information Part 9 - Controls B. Ignition Procedure C. Central Heating (CH) Temperature Adjustment It is possible to adjust the central heating (CH) temperature setpoint Press the ON/OFF button on the control panel to power on the from the home screen by pressing the CH +/- buttons.

  • Page 58: User Menu

    C.H. active from 06:00 to 22:00 the number 1 or 2 of the selected P EXT Time program defined by REMOCON room unit or NTI NET app. zone appears next to the heating Outdoor Reset Curve Slope (only with AUTO function active)

  • Page 59: Info Menu

    Outdoor temperature [°F] 8.3.4 Exhaust flue temperature [°F] 8.7.8 Burner power level [%] 4.3.0/5.3.0 Room temperature [°F] (only with NTI Room Sensor connected) (Zone 1/2) 8.2.5 DHW flow rate [gpm] (TRX199C only) 8.2.2 Actual fan speed [RPM/10] 8.7.9 Burner flame signal Table 28 - Info menu G .

  • Page 60: Automatic Ch Temperature Control (Auto)

    User Menu, or set parameter 2.2.4 = 1 via the technical menu. NOTICE In order for the boiler to detect changes in room temperature it is necessary to install an NTI Room Sensor. Other thermostats (not NTI) can only switch the boiler ON and OFF. -13 °F...

  • Page 61: Type Of Temperature Control

    4 = Indoor and Outdoor Temp. Reset - The boiler target temperature automatically adjusts between the Min and Max Temperature Settings (4.2.6 and 4.2.5), based upon the input temperatures provided by an optional NTI Room Sensor AND the included Outdoor Sensor (or Internet Weather via WiFi connection), in accordance with the following formula: Boiler Target Temp = Min Temp (4.2.6) + Slope of Outdoor Reset Curve (4.2.2) X {Room Sensor Influence (4.2.4) X [Room Setpoint - Room Temp] + [Room Setpoint -...

  • Page 62: Auto Boost

    Outdoor temperature Part 9 - Controls Part 1 - General Safety Information 179 °F K. Parallel Shift of Reset Curve +25°F (e.g. Parameter 4.2.3 for Zone 1) Increase parallel shift When the Reset Curve results in a boiler target temperature 0 °F Default that is too high or too low (i.e., heats the building too quickly...

  • Page 63: Room Temperature Day /Night

    The details can not be displayed on the boiler display. Table 30 - Time programs heating NOTICE Time programs heating are active only with NTI Room Thermostat or Sensor O. Automatic Summer / Winter Changeover When this function is activated, the boiler automatically switches from “winter”...

  • Page 64: Technical Menu - Access And Navigation

    Part 9 - Controls Part 1 - General Safety Information The menu and parameter numbers are shown on the display. P. Technical Menu - Access and Navigation CAUTION! THE MENUS RESERVED FOR QUALIFIED TECHNICIANS MAY ONLY BE ACCESSED AFTER ENTERING THE ACCESS CODE. To access advanced setup and troubleshooting parameters, it is To access the Menus, open the cover and proceed as follows (in this necessary to enter the Technical Menu.

  • Page 65: Technical Menu - Menu Structure

    Reset Factory Settings Other - 1 BMS - Building Management System settings Other - 2 Only applicable with 0-10V / 4-20mA 11 NTI Zone Controller Parameters Clip-In Board installed 0 General 1 Diagnostics 25 Cascade Manager Parameters 0 General 1 System Settings...

  • Page 66: Technical Menu - Complete Menu

    Part 9 - Controls R. Technical Menu - Complete Menu Description Value ACCESS the Complete Menu OK and ESC buttons for 5 seconds. T 222. Simultaneously press the the he display shows 2. Press the “+” button to select 234 , the service code. 3.
  • Page 67 Part 9 - Controls Description Value 3 BOILER CH PARAMETERS - 1 Limited by the absolute values defined by parameters 2.3.3 and 1 Adjustable max CH power percentage 0 - 100 2.3.4, i.e., 0 = min power and 100 = max power. Absolute Max DHW power percentage 0 - 100 CANNOT BE MODIFIED...
  • Page 68 Part 9 - Controls Description Value TRX Non-Combi = Activated when the boiler is connected to 8 Antilegionella frequency 24 - 720 (Hours), or 30 days days a tank by an NTC sensor. (Parameter 228 = 1) 6 BOILER MANUAL SETTINGS Only to test components 0 Manual mode activation 0 = OFF, 1 = ON...
  • Page 69 68 - 122 °F Parameter 4.2.0 = 0 Only applicable when using an 3 Zone Freeze Protection Temperature 36 - 59 °F NTI room sensor - Changes all zones 1 SUMMER/WINTER CHANGEOVER 0 S/W function activation 0 = OFF, 1 = ON 1 S/W temperature threshold 50 - 86 °F...
  • Page 70 Adjusts the influence of room temperature on target boiler temperature - a higher setting causes a greater increase to the boiler target temperature as the indoor temperature drops below room setpoint. Only applicable when using an optional NTI Room Sensor and when 4.2.1 = 2 or 4.
  • Page 71 Adjusts the influence of room temperature on target boiler temperature - a higher setting causes a greater increase to the boiler target temperature as the indoor temperature drops below room setpoint. Only applicable when using an optional NTI Room Sensor and when 5.2.1 = 2 or 4.
  • Page 72 Adjusts the influence of room temperature on target boiler temperature - a higher setting causes a greater increase to the boiler target temperature as the indoor temperature drops below room setpoint. Only applicable when using an optional NTI Room Sensor and when 6.2.1 = 2 or 4.
  • Page 73 Part 9 - Controls Description Value 1 CH Supply Temperature (in °F) 2 CH Return Temperature (in °F) Not applicable to Non-Combi 3 DHW Outlet Temperature (in °F) models 4 Exhaust Flue Temperature (in °F) Only with outdoor sensor 5 Outdoor Temperature (in °F) connected 4 DHW TANK TEMPERATURE (ONLY ACTIVE WITH CONNECTED NTC TANK SENSOR) - Read Only Only with NTC tank sensor...

  • Page 74: 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 Before starting the boiler, and during initial operation, smell material safety data sheet (MSDS) on the fluid used.

  • Page 75: System Water Fill, Purge, And Test

    Part 10 - Start-Up Preparation E. Purge Air from DHW System 6. Anti-freeze solutions expand more than water. For example: A 50% by volume solution expands 4.8% in volume for a temperature 1. Make sure the CH and DHW lines are open and full of water. Turn on increase from 32 - 80 F, while water expands 3% over the same all electric power to boiler.
  • Page 76 Part 10 - Start-Up Preparation 3. If a long horizontal run is used, it may be necessary to create a vent in the horizontal run to prevent a vacuum lock in the condensate line. 4. Do not expose the condensate to freezing temperatures. 5.

  • Page 77: Part 11 - Start-Up

    Part 11 - Start-Up gauge. If not, repeat the procedure. WARNING d. The purge function can be accessed at any time by pressing ESC for five (5) seconds. Press ESC to exit. NOTE: It is recommended to run through the full initial purge cycle at FOR YOUR OWN SAFETY READ BEFORE OPERATING install.

  • Page 78: Combustion Checking Procedure

    Part 11 - Start-Up Operation 3 - Adjusting the CO2 at Maximum Gas Flow Rate (High B. Combustion Checking Procedure Fan Speed) Set the thermostat at the highest possible setting or draw off the The order of operations for this procedure domestic hot water at the maximum water flow rate to create a must always be respected.
  • Page 79 Part 11 - Start-Up Operation 4 - Checking the CO2 at Minimum Gas Flow (Low Fan Speed) With the Test Function active, press the button to operate the boiler at minimum DHW power. The icons will display. Wait 1 minute for the boiler to stabilize before carrying out the combustion analyses.

  • Page 80: Checking Combustion Parameters

    D. Converting the Appliance from Natural Gas to Propane Operation NTI boilers are factory set to operate on Natural Gas. BEFORE OPERATING ON PROPANE the boiler must be converted to Propane using the included conversion kit specific to the boiler model.

  • Page 81: 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 82 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 83: Part 13 - Troubleshooting

    Part 13 - Troubleshooting 3. Malfunction Warning A. Boiler Protection Devices This warning is shown by the display in the following format: The boiler is protected from malfunctioning by means of internal checks performed by the electronic microprocessor PCB, which stops 5 P1 = FIRST IGNITION ATTEMPT UNSUCCESSFUL the boiler from operating if necessary.
  • Page 84 Part 13 - Troubleshooting B. Boiler Error Codes Error Display Description Possible Remedies Type CH Circuit Press the Reset button to clear the Error Code. If Error happens again: Blocking 1 01* Overheat 1. Check for the correct functioning and positioning of the supply and return temperature probes. (Manual 2.
  • Page 85 4 13 Room sensor circuit open or short circuit Zone 3 4 30 Detected accessory wired to BUS If connecting an NTI zone controller to the BUS connection, ensure parameter 11.0.0 = 1. Warning connection 4 31 Ignition and Detection Press the Reset button to clear the error code.
  • Page 86 Part 13 - Troubleshooting Error Display Description Possible Remedies Type This Error Code will go away when the condition is remedied. If Error happens again disconnect the flame detection electrode. Then press Reset. Blocking Flame detected with gas valve 5 02 If the error does not happen again replace the flame detection (Auto closed...
  • Page 87 1. The control has sensed a short circuit on the BUS connection – disconnect field wiring from BUS Incorrect wiring to BUS connection connection. 2. If connecting an NTI room sensor or zone controller to the BUS connection, check for correct EMERG (When in Emergency mode, the polarity and short circuits of the wiring.

  • Page 88: 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, vent or intake pipe openings.

  • Page 89: Maintenance Only To Be Performed By A Qualified Service Technician

    Part 14 - Maintenance Check Water and Gas Piping 3. If applicable, check the condensate neutralizer and ensure it is full 1. Remove the boiler cover and perform a gas leak inspection following of condensate neutralizing marble chips. Operating Instructions on page 2 of this manual. If gas odor or leak is detected, follow procedures on page 2.
  • Page 90 Part 14 - Maintenance 2. 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 91 Part 14 - Maintenance 8. 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 92: 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 instructions Do not install the condensate assembly if a component is lost or in this manual.
  • Page 93 Part 14 - Maintenance Replacing the Fan Replacing the Main Heat Exchanger 1. Remove the silencer and gas line as described in Cleaning the Heat Drain the boiler and remove the combustion assembly as Exchanger Combustion Chamber. described in Cleaning the Heat Exchanger Combustion 2.

  • Page 94: After Maintenance Is Complete

    Part 14 - Maintenance Remove the gas valve. Remove the six (6) fixing screws from the heat exchanger. If Reinstall the new gas valve in reverse order. accessing the screws on the left part of the heat exchanger is BE SURE TO USE NEW SEALING RINGS. difficult remove the lateral panel.

  • Page 95: Part 15 - Maintenance Report

    Part 15 - Maintenance Report 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 96 Part 15 - Maintenance Report Part 1 - General Safety Information INSPECTION ACTIVITIES DATE LAST COMPLETED 1 st YEAR 2 nd YEAR 4 th YEAR* 3 rd YEAR PIPING Near boiler piping Check boiler and system piping for any sign of leakage. Leaking pipes could cause property damage.

  • Page 97: Part 16 - Shutdown

    Part 1 - General Safety Information Part 16 - Shutdown Supply/Return Temperature Sensors A. Shutdown Procedure Outdoor Sensor Tank Sensor Turn the boiler off at the on/off power switch. Wait for the combustion DHW Outlet Sensor blower to stop, so all latent combustion gases are purged from the Outside system.

  • Page 98: Maintenance Notes

    Maintenance Notes...

  • Page 99: 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 100 Visit us online 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 86661 Revision Date 2.25.21...

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