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NTI TFTN Series Installation And Operation Manual

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TFTN 500-850
INSTALLATION AND OPERATION MANUAL
Version Date: 2025-04-24
Update: HMI software version R30
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.
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 # 87545

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Summary of Contents for NTI TFTN Series

  • Page 1 Notice Sign: Indicates a hazardous situation which, if not avoided, could result in property damage. 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 # 87545...

  • Page 2: Table Of Contents

    Installation and Operation Manual TFTN 500-850 Table of Contents 1.0 INTRODUCTION ............................... 4 1.1 G .......................... 4 ENERAL NSTALLATION EQUIREMENTS 1.2 U ..............................4 ESPONSIBILITIES 1.3 I ............................4 NSTALLER ESPONSIBILITIES 1.4 B ..........................5 EFORE PERATING WITH ROPANE 1.5 B ...........................
  • Page 3 TFTN 500-850 Installation and Operation 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 4: Introduction

    General Installation Requirements The installation of your NTI TFTN gas-fired 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 Automatically Fired Boilers ANSI/ASME...

  • Page 5: Before Operating With Propane

    TFTN 500-850 Installation and Operation Manual Before Operating with Propane TFTN boilers are factory set to operate with Natural Gas; BEFORE OPERATING WITH PROPANE, the boiler must be converted using the appropriate Natural Gas to LP Conversion Kit; see below. Failure to properly convert the unit to safely operate with Propane will cause dangerous burner operation, resulting in property damage, serious injury or death.

  • Page 6: In The State Of Massachusetts

    Installation and Operation Manual TFTN 500-850 In the State of Massachusetts (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 7: Specifications

    TFTN 500-850 Installation and Operation Manual 2.0 SPECIFICATIONS Table 2-1 TFTN Specifications DESCRIPTION TFTN500 TFTN600 TFTN725 TFTN850 CSA Input Modulation (MBH) 50 - 500 60 - 600 72.5 - 725 85 - 850 DOE Heating Capacity (MBH) Net AHRI Rating, Water (MBH) Combustion Efficiency (%) 98.0 97.8...

  • Page 8: Dimensions

    Installation and Operation Manual TFTN 500-850 Dimensions Figure 2-1 Boiler Dimension (TFTN500-600)
  • Page 9 TFTN 500-850 Installation and Operation Manual Figure 2-2 Boiler Dimension (TFTN725-850)

  • Page 10: Boiler Location

    Installation and Operation Manual TFTN 500-850 3.0 BOILER LOCATION In all cases, the TFTN boiler 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 11: Boiler Area Ventilation Air Openings

    TFTN 500-850 Installation and Operation Manual Boiler Area Ventilation Air Openings Direct Vent – If boiler area clearances are less than the recommended clearances specified in Table 3-1, the boiler area must be ventilated (Exception: if the boiler area/room has a volume of 275 ft or greater, ventilation of the boiler room is not required).

  • Page 12: General Venting

    Installation and Operation Manual TFTN 500-850 4.0 GENERAL VENTING The TFTN is certified as a “Category IV” boiler requiring a “Special Venting System” designed for pressurized venting. The Exhaust must be piped to the outdoors, using the vent materials and rules outlined in this section. Under no conditions may this unit vent gases into a masonry chimney, unless it is vacant, and utilizes the approved venting material and rules described in this section.

  • Page 13: Flammable Solvents And Plastic Piping

    TFTN 500-850 Installation and Operation Manual Table 4-1 Corrosive Products and Contaminant Sources Products to Avoid Contaminated Sources to Avoid Antistatic fabric softeners, bleaches, detergents, cleaners Laundry facilities Perchloroethylene (PCE), hydrocarbon-based cleaners Dry cleaning facilities Chemical fertilizer, herbicides/pesticides, dust, methane gas Farms or areas with livestock and manure Paint or varnish removers, cements or glues, sawdust Wood working or furniture refinishing shops...

  • Page 14: Near Boiler Exhaust/Air Intake Piping

    Installation and Operation Manual TFTN 500-850 Near Boiler Exhaust/Air Intake Piping The exhaust-vent collar of the TFTN directly accepts CPVC Special Gas Venting (4 in. for TFTN500-600; 6 in. for TFTN725- 850); refer to the applicable section below when piping with other approved Special Gas Venting materials. The air intake collar of the TFTN comes with a 4 in.
  • Page 15 TFTN 500-850 Installation and Operation Manual  Air Intake - check with applicable local codes for acceptable pipe material. Figure 4-1(a) Near Boiler Venting (PVC) Figure 4-1(b) Near Boiler Venting (CPVC) PVC Exhaust Pipe Air Intake Air Intake PVC Air Intake Pipe* PVC Air Intake Pipe* Coupling CPVC Exhaust Pipe...

  • Page 16: Exhaust/Air Intake Pipe Material

    Installation and Operation Manual TFTN 500-850 Exhaust/Air Intake Pipe Material Table 4-3 Acceptable Exhaust and Air Intake Pipe Material Venting System Standards 2, 3 Items Materials United States Canada PVC – DWV UL-1738 or Schedule 40/80 ANSI/ASTM D2665 PVC Schedule UL-1738 or All Exhaust and Air Intake 40/80...

  • Page 17: Direct Vent Installation

    Optional Termination Kits Kits certified with the TFTN are listed in Table 4-7 and available from the manufacturers listed in Table 4-6. Kits with an NTI part number listed in Table 4-7, are available directly from NTI.
  • Page 18 Vent Vent Material Description Supplier P/N Figure Size Compatibility Roof Wall  IPEX Low Profile (Wall) 4” 196986 (NTI P/N 84358) 4-3(c) PVC/CPVC 5,6,7 IPEX Concentric (Wall/Roof) 196021 (NTI P/N 84355), 4-3(b), 4-4(b), 4”   197021 4-4(d) PolyPro® Twin Pipe (Wall) 4”...
  • Page 19 TFTN 500-850 Installation and Operation Manual Termination Options – Direct Vent Installation Figure 4-2(a) Two-pipe (Sidewall) Figure 4-2(b) Concentric (Sidewall) Exhaust – pointing out, min. 18in. above combustion air-inlet Exhaust Air Intake Air Intake – pointing down, min. 12in. above snow level Refer to vent-teminal manufacturer instructions for correctly connecting...
  • Page 20 Installation and Operation Manual TFTN 500-850 Figure 4-2(e) Two-pipe (Roof/Sidewall) Exhaust – pointing up, min. 12in. above snow level Air Intake – pointing down, min. 12in. above snow level Exhaust – pointing out, min. 12in. above snow level Air Intake – pointing down, min.
  • Page 21 TFTN 500-850 Installation and Operation Manual Sidewall Termination Details Figure 4-3(a) Figure 4-3(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 Air-inlet Vertical Min.
  • Page 22 Installation and Operation Manual TFTN 500-850 Roof Termination Details Figure 4-4(a) Figure 4-4(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 Air-inlet...

  • Page 23: Power Vent / Indoor Combustion Air (Non-Direct Vent)

    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 24 Installation and Operation Manual TFTN 500-850 Figure 4-5 Venting Below Grade For installations that exit the wall below grade: Excavate site to a point below where the pipes are Exhaust to exit as shown. Ensure the wall is fully sealed where the pipes penetrate.

  • Page 25: Vent/Air-Inlet Termination Clearances

    TFTN 500-850 Installation and Operation Manual 5.0 VENT TERMINATION CLEARANCES The lettered vent terminal clearances A through M illustrated in Figure 5-1 are described in Table 5-1; abide by these minimum vent terminal clearances while following the instructions detailed in section 4.0 –...
  • Page 26 Installation and Operation Manual TFTN 500-850 Table 5-1 Vent Termination Clearances (…Concluded) Canadian installations US installation Clearance to unventilated soffit Not applicable Not applicable Clearance to outside corner Not applicable Not applicable Clearance to inside corner 36 in (91 cm) 36 in (91 cm) Clearance to each side of center line extended above 3 ft (91 cm) within a height...

  • Page 27: Condensate Drain

    TFTN 500-850 Installation and Operation 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 28 Installation and Operation Manual TFTN 500-850 Figure 6-1(a) Condensate Drain Trap – Exploded View Boiler Condensate Drain Support Bracket (factory supplied) Gear Clamp (factory supplied) Adapter (factory supplied) Condensate Trap (factory supplied) Figure 6-1(b) Condensate Drain Trap - Assembled Prime Condensate Trap with water before firing boiler Position the Condensate Trap inside the Support Bracket, then...

  • Page 29: 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 30 Installation and Operation Manual TFTN 500-850 Do not use an open flame to test for gas leaks. Failure to follow these instructions may result in fire, property damage, serious injury or death. 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”...

  • Page 31: Lighting The Boiler

    TFTN 500-850 Installation and Operation Manual 8.0 LIGHTING THE BOILER Before Start-up refer to Mandatory Pre-commissioning Procedure for Plastic Venting in section 4.3 Flammable Solvents and Plastic Piping. 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 Exhaust/Air Intake, Condensate Drain, and System Water Piping.

  • Page 32: Initial Start-Up

    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 33: Gas Valve And Burner Set-Up

    TFTN 500-850 Installation and Operation Manual 9.0 GAS VALVE AND BURNER SET-UP Set-up of the TFTN 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 Installation and Operation Manual TFTN 500-850 Gas Line Pressure Test The boiler gas valve is equipped with a line pressure test port; see Figure 9-2. Use the following procedure to measure the gas line pressure to the boiler to ensure it falls within the range given in Table 9-1: Turn the supply of gas to the boiler off.
  • Page 35 TFTN 500-850 Installation and Operation Manual Figure 9-1 Manually Adjusting Burner Power via Test Mode - Burner Test Menu (…Concluded)    Select Burner Test from the Test Mode screen Select Max Power from the Burner Test screen  Verify Burner Power goes to 100% before proceeding with Note: If the Burner Power gauge and Power Level are Max Power combustion calibration (see Table 9-1).
  • Page 36 Installation and Operation Manual TFTN 500-850 Figure 9-2 Gas Valve Assembly Line Pressure Test Port (bleed screw) Manifold Pressure Test Port (bleed screw) Throttle Screw – used to calibrate combustion at Max Power (100%) Offset Screw – used to set combustion a Min Power (10%) Low Gas Pressure Switch GML (front) –...

  • Page 37: Boiler And Heating System Piping

    Failure to follow the instructions provided in this section will void the NTI warranty and may result in property damage, fire, serious injury or death.
  • Page 38 Installation and Operation Manual TFTN 500-850 Glycol, Snow Melt, and Oxygen Permeable Piping – When freeze protection is required, only multi metal inhibited propylene glycol, at a minimum of 20% and a maximum of 50%, is allowed for use with boiler system. If the boiler is being used with a snow melt system that requires a concentration of glycol higher than 50%, then a plate heat exchanger is required to separate the snow melt system from the boiler water.

  • Page 39: Near Boiler Plumbing

    Generate a burner demand; the burner should not fire and error “LWCO Open” should appear on the screen. Contact NTI for assistance if this does not happen. 2. Fill the boiler with water; the “LOW WATER” LED should turn off. Press the TEST/RESET button on the LWCO to reset the circuit –...
  • Page 40 Installation and Operation Manual TFTN 500-850 Figure 10-1 Near Boiler Piping Low Water Cutoff (factory installed) Pressure Relief Valve (factory supplied) Pressure/Temperature Gauge (factory supplied) Supply to System Relief Valve Outlet – Directed Downward (typical) Return from System...

  • Page 41: Boiler System Plumbing

    (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). See the examples of Primary/Secondary Loop configurations in Figures 10-3 through 10-10.
  • Page 42 Installation and Operation Manual TFTN 500-850 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 43 TFTN 500-850 Installation and Operation Manual Table 10-3 Circulator and Pipe Size Requirements Typical Primary Loop Pump Temp. Boiler Flow Boiler Head Min. Pipe Model Rise (ºF) Rate (GPM) Loss (ft.) Size (in.) B&G Grundfos Taco Armstrong TFTN500 UPS 50-60F TFTN600 UPS 50-60F TFTN725...
  • Page 44 Installation and Operation Manual TFTN 500-850 Figure 10-3 Plumbing Schematic – CH Zone Valves & Upstream IWH (Option A) NOTES: 1. For ZONE 1-3 to output 24VAC (as illustrated), jumper ZONE INPUT to R (24V). 2. CH PUMP and DHW PUMP each provide the water circulation through the boiler, so size accordingly (see Table 10-3). 3.
  • Page 45 TFTN 500-850 Installation and Operation Manual Figure 10-4 Plumbing Schematic – CH Zone Valves & Upstream IWH (Option B) NOTES: 1. For ZONE 1-3 to output 24VAC (as illustrated), jumper ZONE INPUT to R (24V) 2. The BOILER PUMP provides the water circulation through the boiler, so size accordingly (see Table 10-3). 3.
  • Page 46 Installation and Operation Manual TFTN 500-850 Figure 10-5 Plumbing Schematic – CH Zone Valves & Downstream IWH NOTES: 1. For ZONE 1-3 to output 24VAC (as illustrated), jumper ZONE INPUT to R (24V) 2. The BOILER PUMP provides the water circulation through the boiler, so size accordingly (see Table 10-3). 3.
  • Page 47 TFTN 500-850 Installation and Operation Manual Figure 10-6 Plumbing Schematic – CH Zone Pumps & Upstream IWH (Option A) NOTES: 1. For ZONE 1-3 to output 120VAC (as illustrated), jumper ZONE INPUT to 120V 2. CH PUMP and DHW PUMP each provide the water circulation through the boiler, so size accordingly (see Table 10-3). 3.
  • Page 48 Installation and Operation Manual TFTN 500-850 Figure 10-7 Plumbing Schematic – CH Zone Pumps & Upstream IWH (Option B) NOTES: 1. For ZONE 1-3 to output 120VAC (as illustrated), jumper ZONE INPUT to 120V 2. The BOILER PUMP provides the water circulation through the boiler, so size accordingly (see Table 10-3). 3.
  • Page 49 TFTN 500-850 Installation and Operation Manual Figure 10-8 Plumbing Schematic – CH Zone Pumps & Downstream IWH NOTES: 1. For ZONE 1-3 to output 120VAC (as illustrated), jumper ZONE INPUT to 120V 2. The BOILER PUMP provides the water circulation through the boiler, so size accordingly (see Table 10-3). 3.
  • Page 50 Installation and Operation Manual TFTN 500-850 Figure 10-9 Plumbing Schematic – CH Zone Pumps, Buffer Tank & DHW Recirc NOTES: 1. For ZONE 1-3 to output 120VAC (as illustrated), jumper ZONE INPUT to 120V. 2. The DHW and BUFFER TANK PUMPS each provide the water circulation through the boiler, so size accordingly (see Table 10-3). 3.
  • Page 51 TFTN 500-850 Installation and Operation Manual Figure 10-10 Plumbing Schematic – CH Zone Valves, Buffer Tank & DHW Recirc NOTES: 1. For ZONE 1-3 to output 24VAC (as illustrated), jumper ZONE INPUT to R (24V). 2. The DHW and BUFFER TANK PUMPS each provide the water circulation through the boiler, so size accordingly (see Table 10-3). 3.

  • Page 52: Cascade Installation

    Follower Boilers. 6. System Sensor (mandatory) – install a system sensor (NTI P/N: 84010) on the common outlet (supply) pipe feeding the heating system and wire it to the AUX1 NTC input of the boiler that will be set as Manager; see Figure 11-1.
  • Page 53 TFTN 500-850 Installation and Operation Manual Figure 11-1(a) Cascade Plumbing Schematic – CH Zone Pumps NOTES: 1. For ZONE 1, ZONE 2 & ZONE 3 to output 120VAC (as illustrated), jumper ZONE INPUT to 120V. 2. Pumps responsible for circulating water through the boiler must be sized accordingly (see Tables 10-2 & 10-3). 3.
  • Page 54 Installation and Operation Manual TFTN 500-850 Figure 11-1(b) Cascade Plumbing Schematic – CH Zone Valves (DHW Pump) NOTES: 1. For ZONE 1, ZONE 2 & ZONE 3 to output 24VAC (as illustrated), jumper ZONE INPUT to R (24V). 2. Pumps responsible for circulating water through the boiler must be sized accordingly (see Tables 10-2 & 10-3). 3.

  • Page 55: Setup Procedure

    TFTN 500-850 Installation and Operation Manual Table 11-1 Minimum Pipe Sizes for Multiple Boiler Applications # of Units TFTN500 TFTN600 TFTN725 TFTN850 2.5 in. 3 in. 3 in. 4 in. 3 in. 4 in. 4 in. 4 in. 4 in. 4 in.
  • Page 56 Installation and Operation Manual TFTN 500-850 Set Boiler Address – turn the power on to each boiler and set the Boiler Address from the Cascade Setup menu. The boiler chosen for connecting the System Sensor (and if applicable Outdoor, DHW Recirc or Buffer Tank Sensors and System Pump) must be set as Manager, while the others must be set uniquely as Follower Boiler 1, 2…7.
  • Page 57 TFTN 500-850 Installation and Operation Manual BUS Connection – with the power turned off to all boilers, wire the BUS connections of each boiler together in parallel (i.e., daisy-chained). Make sure to maintain correct polarity of B and T terminals. See Figure 11-1. Turn Power On to all Boilers •...
  • Page 58 Installation and Operation Manual TFTN 500-850 Configure System Sensor Input – from the Sensor Configuration menu of the Manager boiler, set Auxiliary Sensor 1 = System Sensor; see Figure 11-5. Figure 11-5 Configuring System Sensor Input    Select Setup from the home screen Select Tech Menu from the Setup menu ...

  • Page 59: Field Wiring

    TFTN 500-850 Installation and Operation 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 TFTN is 120V / 1 Phase / 60 Hz / 12A.

  • Page 60: Connection Description

    NEUTRAL 120VAC loads, e.g., zone pumps. ZONE OUTPUTS – engage when a CH demand is applied to the respective T-STAT input (or via NTI Room ZONE 1 Sensor configured to an individual zone). Output voltage is sourced from ZONE INPUT. When the...
  • Page 61 DHW TANK SENSOR OR AQUASTAT – input for a tank sensor or tank thermostat (Aquastat) installed in an Indirect Water Heater (IWH). Tank sensor must be 10k beta = 3977 NTC. A tank sensor is SWITCH/NTC available from NTI (P/N 84632). OUTDOOR SENSOR – input for factory supplied outdoor sensor. Reading provides pertinent OD NTC information to the boiler for automatic temperature adjustment.
  • Page 62 Connection is used to connect to other NTI devices such as NTI Room Sensors, NTI Zone Controller (N-Link ZC3), or to cascade to other NTI boilers. Take care to maintain the same polarity of B and T connections at each device.
  • Page 63 1. For ZONE 1-3 to output 24VAC (as illustrated), jumper ZONE INPUT to R (24V). 2. NTI Room Sensors can be used in place of convential room thermostats. Daisy-chain B and T of each sensor to BUS terminals B & T at the boiler, taking care to match polarity. Each room sensor must be configured for the zone it is located in.
  • Page 64 1. ZONE 1-3 to output 120VAC (as illustrated), jumper ZONE INPUT to 120V. 2. NTI Room Sensors can be used in place of convential room thermostats. Daisy-chain B and T of each sensor to BUS terminals B & T at the boiler, taking care to match polarity. Each room sensor must be configured for the zone it is located in.

  • Page 65: Wiring Schematics

    TFTN 500-850 Installation and Operation Manual 13.0 WIRING SCHEMATICS Figure 13-1 Connection Diagram...
  • Page 66 Installation and Operation Manual TFTN 500-850 Figure 13-2 Ladder/Logic Diagram...

  • Page 67: Installation Checklist

    TFTN 500-850 Installation and Operation Manual 14.0 INSTALLATION CHECKLIST Installation  1. If operating on Propane Gas, convert boiler using the appropriate Natural to LP Conversion Kit; see section 1.4 Before Operating with Propane.  2. Locate the boiler in accordance with section 3.0 BOILER LOCATION.

  • Page 68: Annual Maintenance And Inspection

    Combustion Chamber Cleaning Procedure NTI recommends having the combustion chamber cleaned after the first year of operation, with subsequent cleanings scheduled based on the condition of the combustion chamber at the time. Units operating with LP Gas or in an industrial environment may require more frequent cleanings.

  • Page 69: Refractory Ceramic Fibers (Rfc)

    TFTN 500-850 Installation and Operation Manual 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 70: Display Menu Guide

    Installation and Operation Manual TFTN 500-850 16.0 DISPLAY MENU GUIDE Initial Power-up Immediately following power-up of the boiler, the system will go through a process of “Device Discovery”, where the devices connected to the boiler are discovered. This is followed by an “Initializing” process. Figure 16-1 Initial Power-up After device discovery and initializing, the controller performs an air purge sequence that is designed to purge air from the boiler water.

  • Page 71: Home Screen

    Off – boiler will only operate for Anti-freeze function (if set to Enabled) 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 be heated by the Anti-legionella Function (if set to On), or DHW frost protection (tank temp <...

  • Page 72: Setup Menu

    Installation and Operation Manual TFTN 500-850 16.3 Setup Menu Figure 16-5 Setup Menu Setup Wizard – select to Test Mode – select to have the system walk you access the Burner & Output through a step-by-step Test screens or the Air setup procedure of the Purge activation button controller...
  • Page 73 TFTN 500-850 Installation and Operation Manual Figure 16-6 Setup Wizard (…Concluded)       Select the number of heating zones controlled by the boiler Select the type of radiation for the 1 zone (i.e., zone (i.e., number of T-STAT inputs used), then press Next. connected to T-STAT #1 input and ZONE 1 output), then press Next.

  • Page 74: Tech Menu

    Installation and Operation Manual TFTN 500-850 16.3.2 Tech Menu All technical parameters of the main controller are accessed from the Tech Menu. Note: if you have not entered the “ntinet” passcode within the last 30 minutes, you will be asked to enter it again upon selecting Tech Menu;...
  • Page 75 TFTN 500-850 Installation and Operation Manual 16.3.2.1 CH Setup Navigate the Central Heat menus as illustrated in Figure 16-8. Tables 16-1 through 16-5 provide a description of each menu option. Figure 16-8 CH Setup Menus Go to User Menu Takes you directly to the User Menu for the respective Zone Selection.
  • Page 76 Zone Selection Allows selection of the zone that you would like to view/modify; options are Z1 (zone 1), Z2, Z3 & Buffer Tank. Options extend to Z4, Z5 & Z6 if using an NTI N-Link ZC3 zone controller. Max Temperature 4.2.5 Sets the allowable operating outlet water temperature range of the 140°F...
  • Page 77 TFTN 500-850 Installation and Operation Manual Table 16-3 CH Setup – Advanced Settings (Applicable to selected zone) Setting Parameter* Range/Description Factory Setting Zone Selection See Table 16-1 Heating Curve 4.2.2 Sets the slope of the heating curve. The greater the slope, the quicker the Slope boiler target temperature raises as the outdoor temperature decreases.
  • Page 78 Only applicable when using an NTI Room Sensor. (Range = 50-90°F) * Parameter numbers starting with 4 are for Zone 1; substitute the 4 with a 5 (for Zone 2); 6 (for Zone 3); 14 (for Zone 4);...
  • Page 79 TFTN 500-850 Installation and Operation Manual 16.3.2.2 DHW Setup Navigate the DHW menus as illustrated in Figure 16-9. Tables 16-6 through 16-8 provide a description of each menu option. Figure 16-9 DHW Setup Go to User Menu Takes you directly to the user DHW settings menu (i.e., User Menu with Zone Selection = DHW).
  • Page 80 Installation and Operation Manual TFTN 500-850 Table 16-8 DHW Setup – Advanced Settings Setting Parameter Range/Description Factory Setting Tank On 24.21.0 Sets how much the DHW storage tank temperature can drop below Differential target before initiating a DHW demand. Only applicable when using a Tank Sensor.
  • Page 81 TFTN 500-850 Installation and Operation Manual 16.3.2.3 Cascade Setup The Cascade Setup menu must be accessed to set the Boiler Address of each boiler that will be configured as part of a cascade system; see section 11.0 CASCADE INSTALLATION. Once the cascade system is configured, the Cascade Setup menu of the Manager boiler can be accessed to modify the operation of the cascade system.
  • Page 82 2. The parameter number for some Follower boiler settings will begin with 26-32 (instead of 24 or 25); 26 for Follower Boiler 1, 27 for Follower Boiler 2 and so on. Follower boiler settings are available from the “NTI net” webapp, and...
  • Page 83 TFTN 500-850 Installation and Operation Manual 16.3.2.4 Pump Control Settings Access the Pump Control Settings screen to set the overrun time of the boiler, system, and zone pump outputs, configure AUX1 & AUX2 outputs, or to setup the variable speed pump control. Note: the overrun time for the DHW pump output is configured from the DHW Setup ->...
  • Page 84 0-10V signal applied to 0-10V IN, or communication through the BUS connection from a 3 party BMS via NTI BMS Gateway P/N: 3260186. Note: BMS Control is only applicable for CH demands – not DHW demands. For cascade systems, the external input must...
  • Page 85 External controller (power or temp) – the boiler power level, or setpoint temperature, is controlled directly by a BMS communicating through the NTI BMS Gateway (3260186) connected to the BUS. Sets the maximum boiler temperature, corresponding to an input 180°F 42.0.1...
  • Page 86 Installation and Operation Manual TFTN 500-850 16.3.2.6 Restore/Backup The factory settings are stored in memory in the PCB and can be restored at any time using the “Reset PCB to Factory Defaults Settings” option. After 30 minutes of the boiler first being powered on, the PCB settings are automatically backed up to the display memory for future use (i.e., in the event the PCB is replaced).
  • Page 87 The Complete Menu provides a direct access to all PCB parameters, including some that are not accessible from the other menus, and are generally only accessed by NTI technicians or installers needing to access advanced features. Parameters can be selected by scrolling the complete parameter list, or by entering the specific parameter number directly.
  • Page 88 AUX1 NTC for direct boiler control of the temperature of an external buffer tank. Sensor must be 10k beta = 3977 NTC; an optional strap-on System Sensor is available from NTI (P/N 84010). Auxiliary 24.6.2 Sets the functionality of input AUX2 NTC.

  • Page 89: User Menu

    Mode Always Ac ve View/Edit Schedule viewed/edited (or created) by the end user via the “NTI net” mobile App if the boiler is registered to his/her account. User Menu Note: The View/Edit Schedule menu is reserved for a newer release of the display software and is presently not accessible.
  • Page 90 Allows selection of the zone that you would like to view/modify; options are Z1, Z2, Z3, DHW, DHW Recirc & Buffer Tank. Note: options extend to Z4, Z5 & Z6 if using an NTI N-Link ZC3 zone controller, or for cascade application.
  • Page 91 Allows selection of the zone that you would like to view/modify; options are Z1, Z2, Z3, DHW, DHW Recirc & Buffer Tank. Note: options extend to Z4, Z5 & Z6 if using an NTI N-Link ZC3 zone controller, or for cascade application. Modulation Setpoint 24.20.0...
  • Page 92 Allows selection of the zone that you would like to view/modify; Buffer options are Z1, Z2, Z3, DHW, DHW Recirc & Buffer Tank. Tank Note: options extend to Z4, Z5 & Z6 if using an NTI N-Link ZC3 zone controller, or for cascade application. Buffer Setpoint 20.0.3 Buffer tank setpoint during Comfort time period.

  • Page 93: Test Mode

    TFTN 500-850 Installation and Operation Manual 16.3.4 Test Mode The Test Mode is a technical menu and therefore requires the user to enter the passcode “ntinet” if it had not been entered within the last 30 minutes; see section 16.3.1 Setup Wizard for details.

  • Page 94: Connectivity

    19.0.3 Set to "On" to have the time automatically set via the internet connection based on the boiler's entered address. Note: the address is entered when registering the boiler to an “NTI net” End User or Service Center. Internet 19.0.4 Set to "On"...

  • Page 95: Diagnostics

    TFTN 500-850 Installation and Operation Manual 16.3.6 Diagnostics The Diagnostics menu provides access to the Maintenance Warning feature (Service), boiler operating statistics (Statistics), display and PCB software versions (Version), and a list of the open-source licenses used by the display (Software License). Figure 16-19 Diagnostics Menu Software License Provides the open-source licenses...

  • Page 96: Zone Details

    (applicable for cascade system or with N-link 3ZC). Room Temp – current room temperature (only applicable for zones using NTI Room Sensor) Active – status of the zone input; turns green when the zone is calling, and the Priority Level is current Boiler Target –...

  • Page 97: Cascade

    TFTN 500-850 Installation and Operation Manual 16.6 Cascade Figure 16-22 Cascade Details Screen Inlet water pressure of lead Operating Mode selection boiler Wi-Fi weather conditions Size of cascade – sum of all boilers in cascade Outdoor temp – press to Inlet temperature of lead select Internet Weather or boiler...

  • Page 98: Errors

    Installation and Operation Manual TFTN 500-850 16.7 Errors Active errors and error history are listed on the respective menu option screen selectable from the Errors menu. Each screen lists the type of error (Warning or Blocking Error), timestamp when each occurred, fault description, and device (Boiler, Manager, Boiler Slave 1,2…7) the error occurred on Figure 16-23 Errors Menu Scroll –...

  • Page 99: Wi-Fi Connection

    Before proceeding, download the “NTI net” mobile app to your smartphone and login with your “NTI net” credentials. The app guides you through the process of connecting the boiler to the local Wi-Fi Network and registering it to your “NTI net”...
  • Page 100 Select Yes to connect the boiler to the internet.   Upon confirming a Wi-Fi network (Figure 17-4 step 4), the When this popup appears, the “NTI net” app will prompt display shows the progress of the connection you to Join “Remote Gw Thermo”; see Figure 17-4 ...
  • Page 101 TFTN 500-850 Installation and Operation Manual Figure 17-4 “NTI net” App – Making Wi-Fi Connection and Registering Product      Press Join to connect Wait while the app Select the Wi-Fi Enter the password Wait while the con-...

  • Page 102: Troubleshooting

    Installation and Operation Manual TFTN 500-850 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 103 TFTN 500-850 Installation and Operation Manual Figure 18-2 Boiler Temperature in Range Outlet Temp – if higher than ON temp the burner will not attempt to reignite. If using a System Sensor, the burner will only attempt to reignite if the system temp drops below the ON temp –...
  • Page 104 Installation and Operation Manual TFTN 500-850 Display is Blank: i. Confirm that the service switch located at the bottom of the control panel (see Figure 18-4) is in the on position. ii. Confirm that 120VAC is applied to terminals LINE and NEUTRAL; see section 12.0 FIELD WIRING.

  • Page 105: Error Codes

    TFTN 500-850 Installation and Operation Manual Fuses The TFTN boiler is equipped with nine (9) fuses – see Figure 18-4. Check these fuses before replacing any of the controllers or other electrical component; if the fuse is blown, it will prevent the protected device(s) from functioning. If replacing a fuse, only replace with an equivalent version –...
  • Page 106 Installation and Operation Manual TFTN 500-850 Error Error Code Problem Possible Remedy Type Lack of water flow – verify that the pump is getting powered and that there is proper water circulation. 105 1 – Flow check Delta-T > 63°F (3x in Faulty wiring –...
  • Page 107 TFTN 500-850 Installation and Operation Manual Error Error Code Problem Possible Remedy Type System sensor not connected – if using a system sensor, it must be connected at AUX1 NTC. NOTE: Cascade applications require a system sensor to be connected to the Manager boiler. Auxiliary Sensor 1 set as System Sensor –...
  • Page 108 BUS wiring damaged – Inspect BUS wiring for bad connections Missing NTI Room Sensor – if using an NTI Room Sensor for Zone 411/412/413 – Room 1/2/3, then check that it is properly connected to the BUS and...
  • Page 109 TFTN 500-850 Installation and Operation Manual Error Error Code Problem Possible Remedy Type External limit switch wired to AUX LIMIT input is open – check device. If an external limit switch is not being used, place a jumper 460 – External safety Open circuit at AUX Auto across AUX LIMIT.
  • Page 110 Installation and Operation Manual TFTN 500-850 Error Error Code Problem Possible Remedy Type Flame signal did not Normal operation – 5P1 may be displayed momentarily if there is a 5P1 – 1st Ignition meet the minimum problem the boiler will lock out. Follow the directions for the Warning Failed threshold on the 1...
  • Page 111 TFTN 500-850 Installation and Operation Manual Error Error Code Problem Possible Remedy Type 608 – Flue gas Incorrectly From the Complete Menu, enter parameter 24.6.7 and set it to 0. Auto damper malfunction configured PCB Reset Faulty wiring – check the 4-wire harness between the fan and PCB for damage and check it for continuity.
  • Page 112 Installation and Operation Manual TFTN 500-850 Visit us online NTI Boilers Inc. 30 Stonegate Dr. 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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