NTI Trinity TX151AC Installation And Operation Manual
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NTI Trinity TX151AC Installation And Operation Manual

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Trinity Tx
Model Numbers: Tx 51 - 200
Version Date: 2019-06-20
INSTALLATION AND OPERATION MANUAL

TABLE OF CONTENTS

1.0
INTRODUCTION ................................................................................................................ 3
2.0
SPECIFICATIONS .............................................................................................................. 6
3.0
BOILER LOCATION .......................................................................................................... 7
4.0
GENERAL VENTING ....................................................................................................... 10
5.0
VENT/AIR-INLET TERMINATION CLEARANCES ..................................................... 24
6.0
CONDENSATE DRAIN .................................................................................................... 26
7.0
INSTALLING GAS PIPING .............................................................................................. 28
8.0
LIGHTING THE BOILER ................................................................................................. 30
9.0
GAS VALVE AND BURNER SET-UP ............................................................................ 33
10.0 BOILER AND HEATING SYSTEM PIPING ................................................................... 36
12.0 FIELD WIRING ................................................................................................................. 49
13.0 CASCADE INSTRUCTIONS ............................................................................................ 52
14.0 WIRING SCHEMATICS ................................................................................................... 54
15.0 INSTALLATION CHECKLIST ........................................................................................ 56
16.0 ANNUAL MAINTENANCE AND INSPECTION ........................................................... 57
17.0 DISPLAY MENU GUIDE ................................................................................................. 59
18.0 TROUBLESHOOTING ..................................................................................................... 72
19.0 PARTS LIST ...................................................................................................................... 75
HAZARD SYMBOLS AND DEFINITIONS
Danger Sign: Indicates a hazardous situation which, if not avoided, will
result in serious injury or death.
Warning Sign: Indicates a hazardous situation which, if not avoided,
could result in serious injury or death.
Caution Sign plus Safety Alert Symbol: Indicates a hazardous situation
which, if not avoided, could result in minor or moderate injury.
Caution Sign without Safety Alert Symbol: Indicates a hazardous
situation which, if not avoided, could result in property damage.
Notice Sign: Indicates a hazardous situation which, if not avoided,
could result in property damage.
unit may result in property damage, serious injury to occupants, or possibly death.
This Boiler must be installed by a licensed and trained Heating
Technician or the Warranty is Void. Failure to properly install this
H
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NTI # 84874

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  • Page 1: Table Of Contents

    This Boiler must be installed by a licensed and trained Heating Technician or the Warranty is Void. Failure to properly install this unit may result in property damage, serious injury to occupants, or possibly death. NTI # 84874...
  • Page 2 │ Warnings Tx I&O Manual Read Before Proceeding If you do not follow these instructions exactly, a fire or explosion may result causing property damage, serious injury or death. FOR YOUR SAFETY, READ BEFORE OPERATING_ A) This boiler does not have a pilot. It is equipped with an ignition device which automatically lights the burner.

  • Page 3: Introduction

    1.0 INTRODUCTION General Installation Requirements The installation of your NTI Trinity Tx gas boiler must conform to the requirements of this manual, your local authority, and the National Fuel Gas Code ANSI Z223.1 and or CAN/CGA B149 Installation Codes. Where required by the Authority, the installation must conform to the standard for “Controls and Safety Devices for...
  • Page 4 │ Introduction Tx I&O Manual Failure to use the appropriate Natural to LP Conversion Kit and Orifice when operating the Trinity Tx to operate with Propane will result in extremely dangerous burner operation leading to property damage, serious injury or death. Refer to section titled ATTENTION: LIQUEFIED PETROLEUM (LP) PROPANE for applicable conversion kit and LP orifice numbers.
  • Page 5 │Introduction Tx I&O Manual IN THE STATE OF MASSACHUSETTS ONLY (a) For all horizontally vented gas fueled equipment installed in every dwelling, building or structure used in whole or in part for residential purposes, including those owned and operated by the Commonwealth and where the side wall exhaust vent termination is less than seven (7) feet above finished grade in the area of the venting, including but not limited to decks and porches, the following requirements shall be satisfied: INSTALLATION OF CARBON MONOXIDE DETECTORS At the time of installation of the side wall...

  • Page 6: Specifications

    │ Specifications Tx I&O Manual 2.0 SPECIFICATIONS Table 2-1 Trinity Tx Specifications Tx200 Tx200C DESCRIPTION Tx51 Tx81 Tx101 Tx151 Tx151C Space Heating Input Modulation 7.1-57 10.3-82 12.6-101 18.9-151 18.9-80 24.9-199 24.9-120 [MBH] DHW Input Modulation 7.1-57 10.3-82 12.6-101 18.9-151 18.9-151 24.9-199 24.9-199 [MBH]...

  • Page 7: Boiler Location

    │Boiler Location Tx I&O Manual 3.0 BOILER LOCATION In all cases, the Trinity Tx must be installed indoors in a dry location where the ambient temperature must be maintained above freezing and below 100F [38C]. All boiler components must be protected from dripping, spraying water, or rain during operation and servicing.
  • Page 8 │ Boiler Location Tx I&O Manual Figure 3-1 Closet Installation, Minimum Clearances (Non-Combi Model Shown) Min. 1” clearance for hot water and vent pipes Top ventilation opening Max. 6” below ceiling / top Ventilation air opening per 1000 Btu/hr, Top = 12” min.
  • Page 9 │Boiler Location Tx I&O Manual Figure 3-2 Wall Mounting Instructions  Failure to follow instructions may Leave the Top Wall-mount Bracket (A) intact result in fire, serious injury, or death. and remove the Bottom Wall-mount Bracket (B) that is attached to the bottom-back of the This unit requires two people to lift it appliance.

  • Page 10: General Venting

    │ General Venting Tx I&O Manual 4.0 GENERAL VENTING The Trinity Tx is certified as a “Category IV” boiler requiring a “Special Venting System” designed for pressurized venting. The Exhaust Vent must be piped to the outdoors, using the vent materials and rules outlined in this section.
  • Page 11 │General Venting Tx I&O Manual Direct Vent Installation (Best Practice) When installed as a Direct Vent boiler the combustion air-inlet must also be piped directly to the outdoors using the methods described in this section and in accordance with the National Fuel Gas Code, ANSI Z223.1 (U.S.) or CSA B149.1 (Canada) and local requirements.
  • Page 12 │ General Venting Tx I&O Manual Mandatory Pre-commissioning Procedure for Plastic Venting (PVC or CPVC) Do not apply power to the boiler prior to Step 4 in the Mandatory Pre-commissioning Procedure for Plastic Venting. 1) Working with the power turned off to the boiler, completely install the vent and air intake system, securely cementing joints together.
  • Page 13 │General Venting Tx I&O Manual Figure 4-2 (a) Universal Exhaust-vent & Air-inlet Appliance Adapter Gasket Identification and Pipe Insertion Depth Upper Gasket – 3.5” OD Seal 2.36” (CPVC/PVC) use with CPVC (PVC for Air-inlet) 3.46” (PP) Middle Gasket – 3.14” OD Seal use with Polypropylene 4.17”...
  • Page 14 │ General Venting Tx I&O Manual Figure 4-3(b) Near Boiler Venting (CPVC) Figure 4-3(a) Near Boiler Venting (PVC) Swing Joint Swing Joint to attain slope in to attain slope in horizontal runs horizontal runs PVC Air-inlet Pipe* PVC Air-inlet Pipe* PVC Exhaust Vent CPVC Exhaust Vent PVC Coupling...
  • Page 15 │General Venting Tx I&O Manual Vent/Air-inlet Pipe Material Table 4-2 Approved Vent and Air-inlet Pipe Material Venting System Standards 2, 3 Items Materials United States Canada PVC - DWV ANSI/ASTM D2265 Vent Air-Inlet materials installed on gas PVC Schedule 40 ANSI/ASTM D1785 Vent Piping In Canada, all exhaust...
  • Page 16 Kits certified with the Trinity Tx are listed in Table 4-5 and available from the manufacturers listed in Table 4-4. Kits with an NTI part number listed in Table 4-5, are available directly from NTI. Table 4-4 Optional Termination Kit OEMs...
  • Page 17 Supplier p/n Figure Size Compatibility Roof Wall 2” 196984 IPEX Low Profile   4-4(b), 4-6(c) (Wall) 3” 196985 (NTI p/n 84357) 2” 196125 PVC/CPVC IPEX Concentric 4-4(c), 4-5(c),   196116 (NTI p/n 82666) 4,5,6,7 (Wall/Roof) 4-6(b), 4-7(b) 3” 197117 PolyPro®...
  • Page 18 │ General Venting Tx I&O Manual Sidewall Venting Options – Direct Vent Installation Figure 4-4(a) Figure 4-4(b) Two-pipe Termination (Sidewall) Low Profile Termination (Sidewall) 3” IPEX Low Profile Termination Exhaust must terminate a minimum of 18” above Air-inlet illustrated; see Figure 4-6(c) for termination;...
  • Page 19 │General Venting Tx I&O Manual Roof Venting Options – Direct Vent Installation Figure 4-5(a) Figure 4-5(b) Two-pipe Termination (Roof) Two-pipe Termination (Roof-exhaust / Sidewall-inlet) Exhaust must terminate a Exhaust must terminate a minimum of 18” above the Air- minimum of 12” above snow inlet termination;...
  • Page 20 │ General Venting Tx I&O Manual Sidewall Termination Details – Direct Vent Installation Figure 4-6(a) Figure 4-6(b) Two-Pipe Termination (Sidewall) IPEX Concentric Termination (Sidewall) Horizontal 4-12” or greater Refer to documentation included with termination kit for than 36” complete installation instructions. Exhaust Exhaust Exhaust...
  • Page 21 │General Venting Tx I&O Manual  Roof Termination Details – Direct Vent Installation Figure 4-7(a) Figure 4-7(b) Two-Pipe Termination (Roof) IPEX Concentric Termination (Roof) Exhaust Refer to documentation included with termination kit for Vent Screen complete installation instructions. Vent pipe piece to retain vent screen Vent pipe piece to retain vent screen...
  • Page 22 Combustion air containing chemicals such as chloride, fluoride, bromine or iodine or dust and debris will cause corrosion damage of the heat exchanger voiding your NTI warranty. Refer to Table 4- 1 for a list of corrosive products and contaminants sources to avoid.
  • Page 23 │General Venting Tx I&O Manual Figure 4-8 Venting Below Grade For installations that exit the wall below grade: Exhaust 1. Excavate site to a point below where the pipes are to exit as shown. 2. Ensure the wall is fully sealed where the pipes penetrate.

  • Page 24: Vent/Air-Inlet Termination Clearances

    │ Termination Clearances Tx I&O Manual 5.0 VENT/AIR-INLET TERMINATION CLEARANCES The quick reference table below is to be read in conjunction with the numbered notes as indicated, Figures 5-1 and 5-2, and the Venting Rules and Guidelines in Section 4.0. The instructions detailed in this section are a combination of Trinity Tx specific and National Gas Code restrictions.
  • Page 25 │Termination Clearances Tx I&O Manual Figure 5-1 Termination Clearance Quick Reference Diagram (See Table 5-1) Illustrations of Termination Clearances Figure 5-2 Sidewall Termination (See Table 5-1) Clearances “F” and “G” Canada – Minimum 3 ft [915 mm] The US – Minimum 1 ft [305 mm] Two-Pipe Termination Clearance “Q”...

  • Page 26: Condensate Drain

    Condensate Drain│ Tx I&O Manual 6.0 CONDENSATE DRAIN This unit produces liquid condensate in the heat exchanger and venting system as a product of combustion. Steps must be taken to ensure condensate does not collect in the venting system; therefore, all exhaust piping must slope back to the boiler a minimum 1/4”...
  • Page 27 │Condensate Drain Tx I&O Manual Figure 6-1 Condensate Drain Piping Inlet Gasket Inlet Condensate Trap Boiler Condensate Drain Outlet  Cleanout Cap Outlet Gasket  Ball-float Outlet Gasket Outlet Retaining Nut Corrugated Outlet Tube  Inlet Retaining Nut firmly tightened ...

  • Page 28: Installing Gas Piping

    Ensure that:  The gas line connection to the boiler does not apply any weight to the gas valve. NTI recommends using approved flexible gas piping (if acceptable by local codes) to connect the boiler to the gas supply (See Figure 7-1 for details).
  • Page 29 │Gas Piping Tx I&O Manual When performing a pressure test on the gas line piping, be sure the boiler is disconnected or isolated if the test pressure is expected to exceed 1/2 PSI (14” w.c.), as damage to the gas valve could occur resulting in fire, property damage, serious injury or death. Figure 7-1 Gas Line Connection (Typical) Manual Gas Shutoff Valve Should overheating occur or the gas...

  • Page 30: Lighting The Boiler

    Lighting the Boiler│ Tx I&O Manual 8.0 LIGHTING THE BOILER Before Start-up refer to Mandatory Pre-commissioning Procedure for Plastic Venting in Section 4.0. Failure to follow these instructions can result in explosions, injury or death. Prior to turning the gas supply on and lighting the boiler, ensure all aspects of the installation are complete and in conformance with the instructions provided in this manual, including the Vent/Air-inlet, Condensate Drain, and System Water Piping.
  • Page 31 EXTREME ELECTRICAL SHOCK possibly causing serious injury or death. If the unit fails to light consistently and smoothly, contact NTI for technical assistance at 1-800-688-2575. Never allow the boiler to operate if the ignition or operation of the burner is rough or erratic.
  • Page 32 Lighting the Boiler│ Tx I&O Manual Turning Off the Boiler 1. Set the thermostat to the lowest setting, and then turn off all power to the boiler. 2. Turn the gas shutoff valve to the off position.

  • Page 33: Gas Valve And Burner Set-Up

    │Gas Valve and Burner Set-up Tx I&O Manual 9.0 GAS VALVE AND BURNER SET-UP Set-up of the Trinity Tx gas valve must be performed by a licensed Gas Technician. Failure to perform the set-up correctly may result in incorrect operation, component failure, property damage, serious injury or death.
  • Page 34 │ Gas Valve and Burner Set-up Tx I&O Manual Gas Line Pressure Test The boiler gas valve is equipped with a line pressure test port; see Figures 9-1 & 9-2. Use the following procedure to measure the gas line pressure to the boiler to ensure if falls within the range given in Table 9-1: 1.
  • Page 35 │Gas Valve and Burner Set-up Tx I&O Manual Figure 9-1 Gas Valve and Venturi Assembly (Tx51-151) Venturi Throttle Screw – used to calibrate combustion at max. modulation rate Offset Screw – used to set combustion at min. modulation rate (use 2 mm hex wrench) Gas Valve Line Pressure Test Port...

  • Page 36: Boiler And Heating System Piping

    For retrofits, all system piping, including radiators, must be cleansed of build-up including sludge and scale. All systems, old and new, must be cleansed to remove flux, grease and carbon residue; NTI recommends cleaning the boiler system with “Fernox F3 Cleaner”. For retrofit applications with heavy limescale and sludge deposits, a heavier duty cleaner may be required;...
  • Page 37 Note: the use of glycol may reduce the usable output capacity of the boiler, thus requiring the unit to be “down-fired” by limiting the maximum operating capacity and/or the maximum water temperature. NTI recommends against exceeding 35% concentration of glycol.
  • Page 38 │ Boiler and Heating System Piping Tx I&O Manual Near Boiler Piping (Central Heating – CH) Figure 10-2(a) Figure 10-2(b) Tx51-200 (non-Combi) – Fitting Identification Tx51-200 (non-Combi) – CH Piping Boiler Outlet Boiler Inlet 30 PSI Relief Valve Inlet (factory supplied) Pressure Relief Valve Outlet...
  • Page 39 (See Table 10-2 for minimum flow rate requirements). To ensure the minimum flow rate is attained, NTI strongly recommends installing the boiler in a “Primary/Secondary” plumbing configuration utilizing “Closely Spaced Tees” or a “Low Loss Header” to de-couple the Boiler-Primary loop from the System-Secondary loop(s).
  • Page 40 │ Boiler and Heating System Piping Tx I&O Manual Table 10-4 Circulator and Pipe Size Requirements Recommended Primary Loop Pump Size Temp. Boiler Flow Boiler Head Minimum Model Rise (ºF) Rate (GPM) Loss (ft) Pipe Size B&G Grundfos Taco Armstrong ¾”...
  • Page 41 │Boiler and Heating System Piping Tx I&O Manual Figure 10-3(b) Tx101, Tx151 & Tx200 Head Loss Curves Air Removal – The boiler and system plumbing layout must be configured to promote the removal of air from the water. Air vents and bleeders must be strategically placed throughout the system to aid in purging the air from the system during commissioning of the boiler.
  • Page 42 │ Boiler and Heating System Piping Tx I&O Manual Indirect Fired Water Heater – When installed as per Figure 10-5, the indirect fired water heater is in series with the boiler during a demand for DHW. Therefore, its head loss, along with the head loss of the boiler and associated piping, must be considered when sizing the circulator.
  • Page 43 │Boiler and Heating System Piping Tx I&O Manual Figure 10-4 Tx51-200 Primary-Secondary Plumbing (non-Combi) (Single System Circulator Configuration) Figure illustrates the basic plumbing requirements for a Tx51-200 (non-Combi) boiler installation with a single Central Heating circulator. Refer to Figures 10-2(a) and 10-2(b) for boiler fitting identification.
  • Page 44 │ Boiler and Heating System Piping Tx I&O Manual Figure 10-5 Tx51-200 Primary-Secondary Plumbing (non-Combi) (Multiple System Circulator Configuration) Figure illustrates the basic plumbing requirements for a Tx51-200 (non-Combi) boiler installation with multiple Central Heating circulators. Refer to Figures 10-2(a) and 10-2(b) for boiler fitting identification.
  • Page 45 │Boiler and Heating System Piping Tx I&O Manual Figure 10-6 Tx151C & Tx200C Primary-Secondary Plumbing (Combi) (Single System Circulator Configuration) Figure illustrates the basic plumbing requirements for a Tx-Combi boiler installation with a single Central Heating circulator. Refer to Figures 10-2(c) and 10- 2(d) for boiler fitting identification.
  • Page 46 │ Boiler and Heating System Piping Tx I&O Manual Figure 10-7 Tx151C & Tx200C Primary-Secondary Plumbing (Combi) (Multiple System Circulator Configuration) Figure illustrates the basic plumbing requirements for a Tx-Combi boiler installation with multiple central heating circulators. Refer to Figures 10-2(c) and 10- 2(d) for boiler fitting identification.

  • Page 47: Domestic Hot Water (Dhw) Piping - Tx151C & Tx200C (Combi)

    │DHW Piping (Combi) Tx I&O Manual DOMESTIC HOT WATER (DHW) PIPING – Tx151C & Tx200C (COMBI) 11.0 DHW Description of Operation Tx Combi models incorporate a DHW heat exchanger (Brazed Plate) and the controls necessary to heat DHW without requiring a separate water heater. When the internal flow sensor detects potable water flow in excess of 0.3gpm the controller operates in DHW mode, whereby the potable water is heated to the “DHW Setpoint”...
  • Page 48 │ DHW Piping (Combi) Tx I&O Manual Figure 11-1 Near Boiler DHW Piping (Combi models) Tempering Valve (Manditory) DHW to Fixtures DHW Outlet (Hot) Cold Water Supply DHW Inlet (Cold) Isolation Valve Y-Strainer Drain Valve (factory supplied) DHW Plumbing (Tx-Combi) DHW Inlet &...

  • Page 49: Field Wiring

    │Cascade Instructions Tx I&O Manual 12.0 FIELD WIRING All wiring must be in accordance with the Canadian Electrical code CSA C22.1 and/or the National Electrical Code ANSI/NFPA 70, local codes, and this manual. NOTICE: the boiler must be electrically grounded. The electrical rating of the Tx is 120V / 1 Phase / 60 Hz / 12A.
  • Page 50 Tank Thermostat / Sensor (Not Applicable for Tx-Combi models) – Connect the contacts of a DHW Tank Thermostat, or leads of an approved DHW Tank Sensor (NTI P/N: 84632), to terminals 3 and 6. When using a Thermostat, set DHW mode = 2 (menu setting 2-08).
  • Page 51 │Cascade Instructions Tx I&O Manual Figure 12-2 Field Wiring ECM Pumps – due to the large inrush current of ECM pumps, they should only be switched via an isolation relay, not directly via the boiler controller. Powering ECM pumps directly will lead to premature failure of the boiler controller’s pump relay contacts.

  • Page 52: Cascade Instructions

    │ Cascade Instructions Tx I&O Manual 13.0 CASCADE INSTRUCTIONS The Tx controller has the internal capacity to cascade (lead-lag / stage) up to 16 Tx boilers, without the use of an external controller. Use the instructions detailed in this section to set-up and install the Tx cascade system. Figure 13-1 Cascade Plumbing Schematic Communication Wiring –...
  • Page 53 Tx I&O Manual System Sensor – install a system sensor (NTI P/N: 84010) on the outlet (supply) pipe feeding the heating system, see Figure 13-1. Wire the system sensor to terminals 3 and 4 of the Managing Boiler (left boiler in illustration).

  • Page 54: Wiring Schematics

    │ Wiring Schematics Tx I&O Manual 14.0 WIRING SCHEMATICS Figure 14-1 Tx Connection Diagram...
  • Page 55 │Wiring Schematics Tx I&O Manual Figure 14-2 Tx Ladder-Logic Diagram...

  • Page 56: Installation Checklist

    │ Wiring Schematics Tx I&O Manual 15.0 INSTALLATION CHECKLIST Installation  1. If operating on Propane Gas, convert boiler using appropriate conversion orifice. See Table 7-1.  2. Locate the boiler in accordance with Section 3.0 of this manual.  3. Install the Vent/Air-inlet piping in accordance with Sections 4.0 and 5.0 of this manual. Ensure all joints are secured and cemented properly.

  • Page 57: Annual Maintenance And Inspection

     10. Listen for water flow noises indicating a drop in boiler water flow rate. Important - The hydronic system may need to be flushed to eliminate hard water scale (Use Fernox DS-40 Descaler, NTI PN: 83450).  11. Verify proper operation after servicing.
  • Page 58 │ Trinity Tx Maintenance and Inspection Tx Series Refractory Ceramic Fibers (RFC) Personal Protective Equipment Recommended - Read the following warnings and handling instructions carefully before commencing any service work in the combustion chamber. The insulating material on the inside of the burner plate contains Refractory Ceramic Fibers and should not be handled without personal protective equipment.

  • Page 59: Display Menu Guide

    │Display Menu Guide Tx I&O Manual 17.0 DISPLAY MENU GUIDE Initial Power-up Immediately following power-up of the boiler, the display reads, “conn”, indicating it is connecting to the controller; this is followed by a momentary reading of the display software version, e.g. init 5250. After which the controller performs a de-air sequence that is designed to purge air from the boiler water.
  • Page 60 │ Display Menu Guide Tx I&O Manual Figure 17-2 Control Console – Main Screen Water pressure Temperature units Water pressure units Boiler outlet temperature Faucet – flashes OD reset indicator – during DHW demands illuminates when OD sensor is enabled Radiator –...
  • Page 61 DHW temperature – displays the temperature reading from; (i) the Tank sensor (NTI P/N: 84632) located 1-03 in an indirect water heater or (ii) the DHW sensor inside the Tx-Combi boiler (NTI P/N: 84907). When no sensor is used, “OPEn” indicates an open circuit, and “CLOS” indicates a closed circuit – i.e. contact closure from an indirect thermostat.
  • Page 62 │ Display Menu Guide Tx I&O Manual Installer Menu The Installer Menu allows access to all settings for adjustment, as well as viewing of statistical data for troubleshooting. Access the Installer Menu from any screen by pressing the MENU and OK buttons simultaneously until “2-01”...
  • Page 63 0 – off; boiler will not attempt to heat DHW in any way.  1 – tank sensor, NTI P/N: 84632, is installed in the indirect water heater and wired to boiler terminals 3 and 6. Tank temperature is adjusted via setting 2-07.
  • Page 64 │ Display Menu Guide Tx I&O Manual Factory Setting Description Setting Minimum firing rate – allows the installer to increase the minimum modulation/firing rate of the 2-12 boiler; this may be necessary for troubleshooting. Range = 20-44% Maximum firing rate CH – allows the installer to decrease the maximum modulation/firing rate of 2-13 the boiler when operating on a central heat demand;...
  • Page 65 │Display Menu Guide Tx I&O Manual Factory Setting Description Setting Night Setback Temperature – applicable only when CH mode is set to 2 (menu setting 2-03), 2-33 determines the reduction in boiler target temperature during “Night Setback Mode”, i.e. when terminals 7 and 8 receive a demand (contact closure) from a “nighttime setback”...
  • Page 66 │ Display Menu Guide Tx I&O Manual Figure 17-5c Lockout and Error History Navigation (End) End – indicates that you have reached the end of the recorded lockout or error messages. OK button – press to exit the 2-34 or 2-35 History submenu.
  • Page 67 │Display Menu Guide Tx I&O Manual Figure 17-7 Blocking Error Navigation Err – indicates the boiler has a blocking Error code - see Table error. 17-3 for description. Installer Menu – press and hold MENU and OK buttons to view User Menu –...
  • Page 68 UPS (Uninterruptible Power Supply). If source of problem cannot be located, replace controller. Limit Circuit Open (Safety) – see “Loc 5” Controller Malfunction – contact NTI, check field wiring, replace controller. Loc 8-9 Outlet Sensor Fault – controller has sensed an invalid reading at the Clip-on Outlet sensor; check cable, Loc 10 then replace sensor [see Figure 19-1(a), item 15].
  • Page 69 Flame present before ignition – check flame sensor (replace); check condensate drain for blockages; Loc 28 increase post purge setting (Installer Menu setting 2-30). Controller Malfunction – contact NTI, check field wiring, replace controller. Loc 29-30 Flame lost three times during one demand – see Loc 1.
  • Page 70 “unstick” it, if necessary remove plastic overlay from display. Turn power off and on, if problem persists, replace display. Controller Malfunction – contact NTI, check field wiring, replace controller. Err 88-92 Appliance Type – the appliance type stored in the display does not match the appliance type stored in the Err 93 controller.
  • Page 71 Tx I&O Manual Controller Replacement Instructions This section provides important information necessary to successfully replace the boiler controller, NTI P/N 84712, in the event the original controller fails. The replacement controller must be field configured to operate on the Tx boiler model it is being installed on. This is achieved by adjusting the controller’s Appliance Type setting.

  • Page 72: Troubleshooting

    │ Troubleshooting Tx I&O Manual 18.0 TROUBLESHOOTING Observe the following precautions when servicing the boiler. Failure to comply with these may result in fire, property damage, serious injury or death. Servicing the Boiler  Disconnect or shutoff all energy sources to the boiler: 120VAC power, water and gas. ...
  • Page 73 │Troubleshooting Tx I&O Manual mode when the flow exceeds 0.3gpm. If flow is insufficient, check water supply and DHW piping; check Y-strainer for blockage. Check wiring to flow sensor – replace flow sensor if necessary. o Compare DHW setpoint (User Menu reading 1-04) with DHW temp (User Menu reading 1-03); burner fires when the DHW temp drops below DHW setpoint, if the flow exceeds 0.3gpm.
  • Page 74 │ Troubleshooting Tx I&O Manual Table 18-1 Thermistor Resistance vs. Temperature Resistance Ohms (Ω) Resistance Ohms (Ω) Temp °F (°C) Temp °F (°C) -22 (-30) 176,133 122 (50) 3,603 -4 (-20) 96,761 131 (55) 2,986 14 (-10) 55,218 140 (60) 2,488 32 (0) 32,650...

  • Page 75: Parts List

    │ Tx I&O Manual Parts List 19.0 PARTS LIST For a list of parts that corresponds to the item numbers in the callouts, refer to Table 19-1. Note that some item numbers may appear more than once in the parts list depending on which model number is being referenced. Building Owners - Replacement parts are available from your stocking wholesaler.
  • Page 76 │ Parts List Tx I&O Manual Figure 19-1(b) Tx200 Gas Valve & Blower Assembly Figure 19-1(c) Tx Cabinet, Vent and Air-inlet Parts...
  • Page 77 │ Tx I&O Manual Parts List Figure 19-1(d) Tx Controls, Electrical Panel and Display Module Figure 19-1(e) Tx Installation Kit Box Heat Only (Tx51-200) There are 5 different Tx Conversion Kits. Common Each kit has the required orifice, (All Tx Models) decal and instructions.
  • Page 78 │ Parts List Tx I&O Manual Table 19-1 Parts List: Tx Series Item Part # Description 84882 Burner Assembly, c/w door, insulation & gasket (Tx51) 84883 Burner Assembly, c/w door, insulation & gasket (Tx81) 84884 Burner Assembly, c/w door, insulation & gasket (Tx101) 84885 Burner Assembly, c/w door, insulation &...
  • Page 79 │ Tx I&O Manual Parts List Item Part # Description 84423 Receptacle, 120VAC (all Tx models) 84745 Inlet/Pressure Sensor (all Tx models) 84913 Sight Glass, c/w gasket (all Tx models) Heat Exchanger, ASME 2+1 (Tx51 – pre s/n 72000) 84673 (old) Heat Exchanger, ASME 2+1 (Tx51 –...
  • Page 80 │ Parts List Tx I&O Manual Item Part # Description Top (Tx81) Top (Tx101) Top (Tx151) Top (Tx151C) Top (Tx200 & Tx200C) 84726 Heat Exchanger Support Rail, c/w screws (Tx51) 84727 Heat Exchanger Support Rail, c/w screws (Tx81 ASME) 84728 Heat Exchanger Support Rail, c/w screws (Tx101 ASME) 84729 Heat Exchanger Support Rail, c/w screws (Tx151 &...
  • Page 81 NOTES...
  • Page 82 NOTES...
  • Page 83 NOTES...
  • Page 84 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...

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