NTI TFTN Series 3-Zone Boiler Installation Guide

NTI TFTN Series 3-Zone Boiler

Overview

• The N-Link (3-Zone Control Module) is designed to connect to TFTN series boilers, enabling the control of up to (3) additional heating zones.
• Together with the boiler’s integrated zone controls, this allows for a combined total of up to (6) distinct heating zones.
• The N-Link’s unique communication with NTI boilers allows it to take full advantage of the connected boiler’s HMI, including full control of each heating zone’s individual 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 household or commercial application more effectively.

Specifications

High-Voltage I/O
Table 2-1: High-Voltage Barrier Connections

(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 protected by 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

THERMOSTAT INPUTS

|

ZONE 1/4

| R| –  Circuit closure between R and W initiates CH demand and activates output for 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 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

1. Select a suitable location near the boiler to secure the N-Link to the wall.
2. Position the N-Link against the wall and mark the position of the (2) keyholes at the top corners of the mounting flanges [A].
3. Install (2) fasteners of the appropriate type into these marked positions and mount the NLink 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
4. Secure the N-Link by installing (2) additional fasteners through the bottom screw holes [B].

Field-Wiring

1. 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).
2. For the low-voltage wiring, there are (4) cut-outs at the top of the N-Link with (3) provided grommets, which—-if needed—-must be removed and replaced with strain-reliefs suitable for 18-22AWG wiring.
3. For the high-voltage wiring, there are (4) cut-outs at the bottom of the N-Link, with (3) provided grommets, 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 the 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 to TFTN boilers, ensure both dip switches on the N-Link’s zone control PCB (C3Z) are toggled to the “OFF” position to assign it to control zones 4, 5, and 6, while the boiler controls zones 1, 2, and 3 (or vice versa, if desired)

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 with respect to each other

·         Remove the Wi-Fi harness from each “ follower ” boiler

Room Sensor address

| If using NTI Room Sensors in lieu 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

1. Zone Outputs
   • Ensure Zone Output wires are connected to the correct Zone Pump or Valve
2. 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 behaviour from your N-Link, please refer to the following guidelines before calling NTI Technical Support:

1. 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
2. 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.

Parts List

Table 5-1: Spare Parts List

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