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Teral NX-VFC - User Manual

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TERAL INC.
Instruction Manual
Estimated Terminal Pressure
Constant Control of Water
Supply Unit
Thank you very much for purchasing the TERAL water supply unit.
In order to use the water supply unit appropriately, read this instruction manual
before using, and do not perform operation, maintenance and inspection before
understanding the description in this manual thoroughly.
For safety purpose, observe the cautions and warnings in this instruction manual
and those on the labels affixed on the water supply unit.
Keep this manual carefully at hand where it can be consulted at any time of
operation, maintenance and inspection of the water supply unit.
To whom performing utility work:
Be sure to submit this manual to the customer performing
operation, maintenance and inspection of the water supply unit.
Important Notice
Estimated Terminal Pressure Constant
Control of Water Supply Unit
NX-VFC/NX-VFC-e Multiple pump control

Table of Contents

Questions and Answers

  • B
    Brenda GibsonAug 18, 2025
    Why is the receiver tank full in my Teral NX-VFC Control Unit?
    • V
      Vincent OdomAug 19, 2025
      If the Teral Control Unit's receiver tank is full, it could be due to several reasons. First, check if the Solenoid Valve Operation is set to “Man. Open.” If so, set it to “Auto.” Also, examine the ball tap and inflow solenoid valve for any failures, and replace if necessary. Ensure that water hasn't seeped inside the electrode holder and correct the electrode holder section if needed. Finally, verify that the Solenoid Valve Type (P103) is correctly set to match the inflow solenoid valve in use, as an incorrect setting can cause the solenoid valve to open incorrectly.
  • D
    Danielle DavisAug 21, 2025
    What to do if the Teral Control Unit shows receiver tank low dry-run prevention?
    • D
      David ChanAug 21, 2025
      If the Teral Control Unit indicates a low receiver tank level with dry-run prevention, there are several potential causes. First, check that the Tank Selection setting corresponds to the water tank currently in use. If the Solenoid Valve Operation is set to “Man. Close,” switch it to “Auto.” Inspect the ball tap and inflow solenoid valve for failures, replacing them if necessary. Also, verify the Solenoid Valve Type (P103) setting to ensure it matches the inflow solenoid valve. Finally, check the electrode wiring and electrode holder section for poor connections or disconnections and correct them.
  • M
    manningkristaAug 23, 2025
    Why is my Teral NX-VFC Control Unit showing a high temperature warning?
    • R
      raymondmasonAug 23, 2025
      A high temperature warning in your Teral Control Unit can stem from several causes. It could be due to a malfunctioning flow switch causing continuous pump operation, even when no water is being used. Water leakage leading to low flow rates can cause heat to accumulate inside the pump. Damage to the pressure tank diaphragm can also trigger the pump to run unnecessarily. Ensure the incoming water temperature is within the specified limits. Lastly, the high-temperature sensor itself may be faulty and require replacement.
  • J
    Jeffrey KennedyAug 26, 2025
    What causes overcurrent or overload in a Teral Control Unit?
    • R
      robertjonesAug 26, 2025
      An overcurrent, stall prevention, or inverter overload in your Teral Control Unit can be attributed to several factors. The unit might be operating outside the specified flow rate range, or there could be damage to the bearings. Foreign matter caught in the pump can also cause these issues. Additionally, a drop in power voltage or an imbalance between phases can increase the electric current. Lastly, a motor failure can lead to an overcurrent flow. Adjust the load to fall within the specified range.
  • G
    gomezmarcAug 28, 2025
    Why does my Teral NX-VFC have a start frequency failure?
    • M
      Melissa BakerAug 28, 2025
      A start frequency failure in the Teral Control Unit can occur due to a few reasons. If the diaphragm of the pressure tank is damaged, it may not maintain internal pressure, leading to frequent pump starts. Continuous water usage at a low flow rate, possibly from leakage or an open faucet, can also cause this issue. Additionally, a malfunctioning flow switch might constantly detect a low flow rate.
  • P
    pattersonmichelleAug 30, 2025
    Why is the discharge pressure dropping abnormally in my Teral Control Unit?
    • T
      Theresa WilliamsAug 30, 2025
      An abnormal drop in discharge pressure in your Teral Control Unit could be due to insufficient priming or water escaping from the piping system, preventing the pump from lifting water. Air entering through the suction piping can also hinder the pump's performance. Make sure the TJ valve is open to allow water to pass through the pressure transmitter section. Verify that the set value for starting the pump aligns with the pump's capacity. Ensure the pump runs correctly and the motor rotates in the correct direction. Lastly, check for any blockages in the suction piping or pump due to foreign matter.
  • M
    Mike Bishop DDSSep 1, 2025
    How to fix high temperature on Teral Control Unit panel?
    • E
      Eric KnightSep 1, 2025
      If the control panel of your Teral Control Unit is overheating, the cooling fan on the outdoor cover might be broken and needs replacement. Another cause could be a high ambient temperature, especially if the unit is exposed to direct sunlight. Improving the installation environment may resolve this issue.
  • S
    schaeferstaceySep 3, 2025
    What causes electrode failure in a Teral Control Unit?
    • K
      Kathy ZamoraSep 4, 2025
      Electrode failure in a Teral Control Unit is often caused by incorrect electrode wiring or poor/disconnected electrode wiring. Check and correct the electrode wiring to resolve this issue.
  • J
    James GarciaSep 6, 2025
    What causes a pressure transmitter failure in a Teral NX-VFC Control Unit?
    • J
      John HodgesSep 6, 2025
      A pressure transmitter failure in your Teral Control Unit may occur if the pressure transmitter is broken. Another possible cause is frozen piping. Protect the piping with heat insulating material.
  • K
    Kimberly HernandezSep 8, 2025
    Why is my Teral NX-VFC Control Unit's inverter overheating?
    • L
      Lauren MoodySep 9, 2025
      Inverter overheating in your Teral Control Unit can be caused by a high ambient temperature. Additionally, a broken cooling fan can lead to this issue. Improve the installation environment.

Summary

Important Notice!

Limited Warranties

Manual Purpose and User Notices

Safety Precautions

Safety Indications and Symbols Explained

Explains the meaning of safety indications and graphic symbols used throughout the manual.

Essential Safety Guidelines

Crucial safety instructions to ensure safe operation and prevent hazards.

Pre-Use Checks and Model Identification

2.1 Initial Unit Inspection Checklist

Steps to verify the water supply unit upon unpacking, checking for damage and completeness.

2.2 Understanding Model Designations

Decoding the model type to understand its configuration and specifications.

Unit Configuration and Overview

3.1 Specifications of the Water Supply Unit

Details standard specifications, operating conditions, and components of the water supply unit.

Component Identification

3.2 Names and Functions of Each Part

Identifies and describes the function of each component of the water supply unit.

Control Panel Elements

3.2.2 Names and Functions of Control Panel Elements

Details the functions of each button, switch, and indicator on the control panel.

Control Panel Configuration

3.2.3 Configuration of the Control Panel

Shows the layout and components within the control panel enclosure.

Control Board Details

3.2.4 Control Board

Details the control board layout, connector assignments, and terminal block codes.

Control Panel Specifications

3.3 Specifications of Control Panel

Lists specifications for the control panel, including operation modes and features.

Specification Tables

3.4.1 Standard Models (Positive Suction Type)

Provides detailed technical specifications for standard models with positive suction.

Special Model Specifications

3.4.2 Special Models (Negative Suction Type)

Provides detailed technical specifications for special models with negative suction capability.

Installation Procedures

4.1 Precautions for Installation

Critical safety and environmental guidelines for installing the water supply unit.

Piping Work Guidelines

4.2 Precautions for Piping Work

Key guidelines and warnings for executing correct and safe piping installations.

Wiring Work Guidelines

4.3 Precautions for Wiring Work

Essential safety measures and procedures for connecting the power supply wiring.

Instrumentation Wiring

4.3.2 Instrumentation

Instructions for wiring instrumentation, including water level control and solenoid valves.

External Output Signals

(2) External output signals

Details on connecting wires to external output terminals for system status monitoring.

Operation Preparation

5.1 Points to be checked before test operation

Essential checks for electrical and pump systems before conducting test operations.

Powering Up the Unit

5.2 Turning on the power

Step-by-step guide for powering on the unit and performing initial system status checks.

Test Operation

6.1 Check items related to manual operation

Checks and procedures for testing pump operation in manual mode.

Automatic Operation Testing

6.2 Check items related to automatic operation

Procedures and checks to ensure proper function in automatic operation modes.

Basic Operations and Settings

7.1 Pump Operation

Explains how to select and perform manual and automatic pump operations.

Receiver Tank Configuration

7.2 Selecting a receiver tank

Guide to selecting receiver tanks and the corresponding circuit connections for operation.

Inflow Solenoid Valve Control

7.3 Selecting the operation of the inflow solenoid valve

Options for controlling the inflow solenoid valve: manual open, manual close, or automatic.

Display Indications

7.4 Indications on the display

Details the various items displayed on the control panel and their descriptions.

Display Information Switching

7.4.1 How to switch basic information display

Instructions on how to cycle through different basic information screens on the panel.

Alarm and Pump Information Display

7.4.2 How to display alarm logs

Procedure for accessing and viewing the history of system alarms.

7.4.3 How to display pump information

How to view detailed operational data for each individual pump.

Parameter Configuration

7.5 Parameter settings

Overview of parameters for customizing unit functions and operation.

Parameter Setting Procedures

7.5.2 Parameter setting procedure

Step-by-step guide for entering setting mode and changing parameter values.

Basic Parameter Details

7.5.3 Basic parameters

Details on setting total head, sustained head, and pump operation permissions.

Extended Parameter Configuration

7.5.4 Extended parameters

Settings for external relay output and energy-saving operation modes.

Maintenance and Inspection

8.1 Precautions for maintenance and inspection

Safety guidelines and general points for performing unit maintenance and inspections.

Inspection Mode Operation

8.2 Inspection mode

Instructions for activating and operating the unit in inspection mode.

Maintenance Checklists

8.3 Maintenance check list

Detailed checklist for daily, half-yearly, and yearly maintenance activities.

Troubleshooting and Alarm Handling

9.1 Alarm handling

Lists alarm codes, their descriptions, and how to check for and handle alarms.

Troubleshooting Guide

9.2 Troubleshooting

Table of probable causes and remedies for various alarm codes and system issues.

Special Specifications

10.1 Negative suction type

Details specific features and installation for negative suction water supply units.

Outdoor Cover Models

10.2 Models with outdoor cover

Instructions for assembling and disassembling the outdoor cover accessory.

Teral NX-VFC Specifications

General IconGeneral
BrandTeral
ModelNX-VFC
CategoryControl Unit
LanguageEnglish