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

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.

Teral NX-VFC Specifications

General

Brand	Teral
Model	NX-VFC
Category	Control Unit
Language	English

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.