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TRX SERIES II GAS-FIRED CONDENSING BOILER: TRX085
85,000 BTU | Wall-Hung | 96% AFUE | ASME “H” Stamped
The TRX085 Series II is a high-efficiency residential condensing boiler engineered for superior comfort, energy savings, and long-lasting performance. Certified to ANSI Z21.13 / CSA 4.9 standards, the TRX085 is wall-mounted with zero clearance to combustibles and incorporates NTI’s advanced stainless-steel heat exchanger technology. Its sealed combustion design ensures quiet, safe operation in all conditions, while Wi-Fi enabled controls provide convenient monitoring and adjustment.
Energy Efficiency
The TRX085 is designed to maximize energy performance while minimizing fuel consumption:
- 96% AFUE efficiency rating for reduced energy bills.
- 9:1 modulation ratio for precise load matching.
- Outdoor temperature sensor included for weather-responsive operation.
- Low NOx emissions and eco-friendly operation.
Reliable Function
The TRX085 is built with premium-grade components to deliver safe and reliable operation:
- ASME “H” stamped 441 stainless-steel watertube heat exchanger.
- Integrated ECM boiler circulator and condensate trap.
- Sealed cabinet and high-energy ignition transformer.
- Automatic fault detection, lockout/error history storage.
Convenience & Installation
The TRX085 simplifies installation and maintenance:
- Wall-mounted design with zero clearance to combustibles.
- Built-in Setup Wizard for quick configuration.
- Wi-Fi enabled remote monitoring and diagnostics.
- Integrated 3-way valve for seamless CH/DHW switching (Combi models only).
Warranty Coverage
Backed by NTI’s industry-leading warranty, the TRX Series II offers extended coverage for both parts and heat exchanger, ensuring long-term peace of mind and reliable performance.
| Item | Parameter |
|---|---|
| Product | TRX085 Series II |
| Input Rating (CH) | 9.4 – 85 MBH |
| Heating Capacity | 79 MBH |
| Net AHRI Rating | 69 MBH |
| AFUE | 96% |
| Modulation Ratio | 9:1 |
| Boiler Setpoint | 68–179°F (20–82°C) |
| Ambient Operating Range | 33–104°F (0.6–40°C) |
| Max Water Pressure (CH) | 55 psi |
| Relief Valve | 30 psi |
| Gas Supply Pressure (NG) | 3.5 – 10.5 in. W.C. |
| Gas Supply Pressure (LP) | 8 – 13 in. W.C. |
| Heat Exchanger | 441 Stainless Steel, Watertube |
| Dimensions & Weight | |
| Height | 35.4 in. (900 mm) |
| Width | 17.3 in. (440 mm) |
| Depth | 15.6 in. (395 mm) |
| Weight | 110 lb (50 kg) |
NTI-TRX-Series-II-Brochure-Comp
NTI-TRX-Series-II-Brochure-Comp-FR
TRX Series II Installation and Operation Manual TRX085:110C:120:150C
TRX Series II Installation and Operation Manual TRX085:110C:120:150C-FR
TRX Series II Installation and Operation Manual TRX150:199:199C
TRX Series II Installation and Operation Manual TRX150:199:199C-FR.pdf
TRX Series II Error Codes
-
Blocking Errors – Temporary interruptions that auto-clear when the fault condition is removed.
Examples: 110 – Supply Sensor Fault, 132 – Return Sensor Fault, 133 – DHW Sensor Fault, 108 – Pump Antifreeze Run. -
Lockout Errors – Critical issues that require manual reset via the Reset button.
Examples: 501 – Ignition Failed, 502 – Flame Lost, 103 – Overheating (>210°F), 104 – Low Water Pressure. -
Malfunction Warnings – Non-critical alerts indicating maintenance/service is required.
Examples: 201 – Flue Sensor Fault, 202 – Air Pressure Switch Error, 203 – Fan Speed Error, 204 – Gas Valve Error.
⚠️ If lockout errors occur frequently, contact a qualified service technician. For safety, the boiler allows only 5 resets within 15 minutes; a 6th attempt locks the unit until power is cycled.
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