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NTI Trinity Lx150 - User Manual

NTI Trinity Lx150
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Trinity Lx
Model Numbers: Lx150 - 800
Version Date: 2016-01-27
INSTALLATION AND OPERATION INSTRUCTIONS FOR
TRINITY Lx BOILER
TABLE OF CONTENTS
1.0 INTRODUCTION ................................................................................................................ 3
2.0 INTRODUCTION ................................................................................................................ 6
3.0 BOILER LOCATION .......................................................................................................... 8
4.0 GENERAL VENTING ....................................................................................................... 13
5.0 VENT AND AIR-INTAKE TERMINATION CLEARANCES ........................................ 28
6.0 CONDENSATE DRAIN .................................................................................................... 31
7.0 INSTALLING GAS PIPING .............................................................................................. 32
8.0 LIGHTING THE BOILER ................................................................................................. 34
9.0 GAS VALVE AND BURNER SET-UP ............................................................................ 36
10.0 BOILER AND HEATING SYSTEM PIPING ................................................................... 43
11.0 LEAD LAG INSTRUCTIONS ........................................................................................... 51
12.0 FIELD WIRING ................................................................................................................. 54
13.0 WIRING SCHEMATICS ................................................................................................... 60
14.0 INSTALLATION CHECKLIST ........................................................................................ 64
15.0 ANNUAL MAINTENANCE AND INSPECTION ........................................................... 65
16.0 PARTS LIST ...................................................................................................................... 67
17.0 TROUBLESHOOTING ..................................................................................................... 79
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 # 86573
H

Table of Contents

Questions and Answers

  • C
    Carla BurchAug 12, 2025
    Why is my NTI Trinity Lx150 Boiler making banging sounds or showing Lockout 81?
    • T
      Thomas MillerAug 12, 2025
      If your NTI Boiler is making banging or hissing sounds, or displaying a Lockout 81 (Delta T limit), it might be due to insufficient water flow. Check Fuse "A" and the boiler pump. Ensure the plumbing is correct and that the water pressure is at least 15PSI. If you have a boiler, the heat transfer surfaces may be fouled with scale or magnetite. Clean with Fernox DS-40 Descaler and Cleanser.
  • C
    Christopher MartinAug 16, 2025
    How to troubleshoot a NTI Boiler blower that is not operating?
    • D
      Debra HernandezAug 17, 2025
      If your NTI Boiler's blower isn't operating, the possible causes are a blown fuse, a faulty controller, or a faulty pump. Begin by checking Fuse "B". If the fuse is not blown and the controller is operating, go to the pump diagnostic on the display. Manually switch the pump on, and check for 120VAC at the pump connection terminal on the line voltage barrier strip. If 120VAC is not detected, then replace the controller. If 120VAC is supplied to the pump, but the pump still doesn't work, replace the pump.
  • J
    Justin WagnerAug 21, 2025
    What to do if my NTI Trinity Lx150 Boiler shows Lockout 65?
    • C
      Cheryl GreenAug 21, 2025
      If your NTI Boiler displays Lockout 65 (Interrupted Air Switch OFF), it could be normal during the drive to light-off. However, it can also indicate a blown fuse. In that case, check Fuse "A", as a blown fuse prevents the blower from operating.
  • M
    Mallory EllisAug 25, 2025
    What causes Lockout 82 on my NTI Trinity Lx150 Boiler?
    • S
      Sarah RoweAug 26, 2025
      If your NTI Boiler shows Lockout 82 (Stack limit), it could be due to a dirty heat exchanger or an incorrect “Stack limit setpoint”. Inspect and clean the combustion chamber and/or heat exchanger if needed. Unless the boiler is installed in Canada with PVC exhaust venting, set the “Stack limit setpoint” to the maximum setting of 220ºF (104ºC). In Canada, PVC exhaust venting is limited to 149ºF (65ºC).
  • A
    Ashley GonzalezAug 29, 2025
    What does Lockout 63 mean on my NTI Trinity Lx150?
    • K
      Kaitlyn RuizAug 29, 2025
      If your NTI Boiler displays Lockout or Hold 63 (LCI OFF), it's possible that a replacement control is incorrectly configured. The LCI must be set to “enable” on all Lx models, excluding Lx150/150E units with a serial number of 49351 or lower and Lx200/400 units with a serial number of 48251 or lower.
  • A
    Abigail ClarkSep 2, 2025
    Why does my NTI Trinity Lx150 show Lockout 61?
    • S
      Samantha BruceSep 2, 2025
      If your NTI Boiler is showing Lockout or Hold 61 (Anti short-cycle), check the demand. This delay is designed to prevent the burner from cycling too rapidly.
  • A
    Alexandria GrayNov 7, 2025
    What to do if my NTI Trinity Lx150 shows Lockout 109 or Hold 110?
    • J
      Jerome YoungNov 7, 2025
      If your NTI Boiler experiences Lockout 109 (Lx500-800) or Hold 110 (Lx150-400), which indicates an ignition failure, start by checking the spark cable connection to the spark generator and igniter electrode, ensuring the green ground wire is securely attached. Also, make sure the manual gas shutoff valve is open and that the flame rod signal wire is securely connected to the flame rod at the bottom center of the burner door. Check the wiring from controller to spark generator and measure voltage across J5-6 and ground during trial for ignition. If the spark generator is receiving 120VAC and no spark is observed via the observation port, replace the spark generator. Verify the gas valve wiring harness for loose connections and measure the voltage from controller terminals J5-2 to J4-10; 24V...

NTI Trinity Lx150 Specifications

General IconGeneral
Boiler TypeCondensing
Fuel TypeNatural Gas or Propane
Maximum Input (BTU/hr)150, 000
AFUE95%
Gas Connection Size3/4" NPT
Water Connection Size1 inch
Electrical Requirements120V, 60Hz
Warranty5 years

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