NTI TRX Series II 3 Zone Control Module
Overview
The N-Link (3-Zone Control Module) is a specialized, NTI accessory product that enables the control of up to (3) additional heating zones when installed with compatible NTI boilers:
- For TRX Series II, FTVN Series II, and Compass Series boilers—-which each include integrated zone controls for up to (2) distinct heating zones—-the N-Link enables (3) additional heating zones for a combined total of up to (5) controllable heating zones.
- For TFTN Series boilers—-which include integrated zone controls for up to (3) distinct heating zones—-the N-Link enables (3) additional heating zones for a combined total of up to (6) controllable heating zones.
The N-Link’s unique communication with compatible NTI boilers allows ALL heating zones to be controlled via the boiler’s integrated HMI, including each heating zone’s parameters. Unlike other, more rudimentary zone controllers, the N-Link maintains awareness of each heating zone’s specific requirements during heating demands and can therefore serve multiple, different heating zones within a residential or commercial application more effectively.
Specifications
High-Voltage I/O
Table 2-1: High-Voltage Barrier Connections
|
Connection |
Description |
|
| MAIN POWER INPUT (120VAC) | LINE | Line (L1) input for 120VAC power supply |
| NEUTRAL | Neutral (L2) input for 120VAC power supply and 120VAC zone loads (e.g. 120VAC zone pumps) | |
| ZONE OUPUTS (120VAC or 24VAC) | ZONE 1/4 | – Activate on CH demand from respective THERMOSTAT INPUT (or NTI Room Sensor configured to respective zone); output voltage sourced from ZONE INPUT
– Deactivate (following overrun time) on DHW demand – Each circuit is protected by a dedicated 5A fuse (slow-blow) |
| ZONE 2/5 | ||
| ZONE 3/6 | ||
| 120VAC or 24VAC | 120V | Jumper to ZONE INPUT for 120VAC zone outputs (e.g. zone pumps) |
| ZONE INPUT | Jumper to required voltage supply for zone outputs (e.g. to 120V for 120VAC zone pumps or R (24V) for 24VAC zone valves) | |
| R (24V) | Jumper to ZONE INPUT for 24VAC zone outputs (e.g. zone valves) | |
| 24VAC RETURN | COMMON | – Return/Neutral leg of 24VAC power supply
– Connection point for Return/Neutral leg of optional 24VAC loads (e.g. zone valves) – Complete circuit protected by single 2A blade fuse (fast-blow) |
Low-Voltage I/O
Table 2-2: Low-Voltage PCB Connections
|
Connection |
Description |
||
| THERMOSTAT INPUTS | ZONE 1/4 | R | – Circuit closure between R and W initiates CH demand and activates output for the respective zone (see Table 2-1)
– R = 24VAC output; W = 24VAC input; C = common – Protected by single 2A blade fuse (fast-blow) – For 2-wire devices, connect only to R and W (do NOT connect to C) |
| W | |||
| C | |||
| ZONE 2/5 | R | ||
| W | |||
| C | |||
| ZONE 3/6 | R | ||
| W | |||
| C | |||
| ALRM (Alarm) | – Dry contacts (NO); close during a lockout or other alarm condition; may be connected to BMS
– Maximum capacity = 2A (MAX) at 24VAC |
||
| EBUS | B | – Connection point for external BUS devices (e.g. NTI Room Sensors, NTI boilers, NTI SENSYS, other N-Links, etc.)
– B = (+) input; T = (-) or GND input |
|
| T | |||
| B | |||
| T | |||
Installation
Wall-Mounting
- Select a suitable location near the boiler to secure the N-Link to the wall.
- Position the N-Link against the wall and mark the position of the (2) keyholes at the top corners of the mounting flanges [A].
- Install (2) fasteners of the appropriate type into these marked positions and mount the N-Link via the (2) keyholes [A]:
- For 16” stud spacing or plywood installation, use appropriately sized wood screws
- For drywall or masonry installation, use appropriately sized drywall or masonry screws and anchors
- Secure the N-Link by installing (2) additional fasteners through the bottom screw holes [B].
Field-Wiring
- To remove the N-Link’s protective cover panel, loosen the (4) screws in the slotted cut-outs along its top and bottom edges, then gently slide it towards you (away from the wall).
- For the low-voltage wiring, there are (4) cut-outs at the top of the N-Link with (3) provided plastic plugs, which—-if needed—-must be removed and replaced with strain-reliefs suitable for 18-22AWG wiring.
- For the high-voltage wiring, there are (4) cut-outs at the bottom of the N-Link, with (3) provided plastic plugs, which—-if needed—-must be removed and replaced with strain-reliefs suitable for 14-18AWG wiring.
Zone Pumps (120VAC)
- Wire the “hot” connection for up to (3) zone pumps to barrier position(s): ZONE 1/4, ZONE 2/5, and ZONE 3/6, respectively
- Wire the “return” connection for up to (3) zone pumps to barrier position(s): NEUTRAL
- Jumper between barrier position(s): ZONE INPUT and 120V
- Connect to the boiler via its BUS connector, respecting the polarity: B-B, T-T
Zone Valves (24VAC)
- Wire the “hot” connection for up to (3) zone valves to barrier position(s): ZONE 1/4, ZONE 2/5, and ZONE 3/6, respectively
- Wire the “return” connection for up to (3) zone valves to barrier position(s): COMMON
- Jumper between barrier position(s): ZONE INPUT and R
- Connect to the boiler via its BUS
NTI Room Sensors
- If preferred, you can use up to (3) NTI Room Sensors with the N-Link instead of thermostats by connecting them via the EBUS connector—-again, respecting the polarity: B-B, T-T
- Refer to the NTI Room Sensor instructions to assign the desired zone address for each zone (i.e. zone 1/4, 2/5, 3/6)
Dip Switches
- When connecting the N-Link to a compatible NTI boiler, ensure both dip switches on the N-Link’s zone control PCB (C3Z-NA) are toggled to the “OFF” position to assign it to control zones 4, 5, and 6…
- For TRX Series II, FTVN Series II, and Compass Series boilers, the boiler will manage zones 1 and 2 by default, with zone 3 left absent.
- For TFTN Series boilers, the boiler will manage zones 1, 2, and 3 by default.
Troubleshooting
Bus Collision
Table 4-1: EBUS traffic collisions
| EBUS wiring | Ensure EBUS connections are wired with correct polarity: B-B and T-T |
| Dip switch settings | Ensure only (1) device with a Zone Control PCB (C3Z) has its dip switches in the “ON” position— either the N-Link or the TFTN boiler; not both |
| Cascade settings | If using boilers which are cascaded together…
· Disconnect the N-Link and ensure the boiler addresses are set correctly concerning each other · Remove the Wi-Fi harness from each “follower” boiler |
| Room Sensor address | If using NTI Room Sensors instead of thermostats…
· Ensure each NTI Room Sensor is set to a unique zone address (i.e. 1-3 or 4-6). See the NTI Room Sensor installation instructions |
Incorrect Zone Output Activation
- Zone Outputs
- Ensure Zone Output wires are connected to the correct Zone Pump or Valve
- Zone Inputs
- If using thermostats, ensure each is connected to the correct Zone Input
- If using NTI Room Sensors, ensure each is set to the correct Zone Address
Before calling NTI Technical Support
If you are still experiencing unexpected behavior from your N-Link, please refer to the following guidelines before calling NTI Technical Support:
- Check the LED indicator lights on the Zone Controller PCB (C3Z) for error warnings:
- If any LEDs are ‘RED’, refer to the boiler’s HMI for details on the error
- Refer to the boiler’s Installation & Operation Manual (IOM) for advice on how to clear the error from the system
- Turn “OFF” the power to the N-Link and/or the boiler, wait 15 seconds, then turn it back “ON” to reinitialize the system:
- Make sure to only do this while the boiler is in standby mode; do NOT do this during a heating demand.
Visit us online
NTI Boilers Inc.
- 30 Stonegate Dr. Saint John, NB E2H 0A4
- Technical Assistance: 1-800-688-2575
- Website: www.ntiboilers.com
- Fax: 1-506-432-1135
Documents / Resources
 |
NTI TRX Series II 3 Zone Control Module [pdf] Instruction Manual TRX Series II, FTVN Series II, Compass Series, TFTN Series, TRX Series II 3 Zone Control Module, TRX Series, II 3 Zone Control Module, Zone Control Module, Control Module, Module |