Instanta Limited ucd series

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INSTANTA LIMITED

S E R V I C E M A N U A L

ISSUE: 1- Dated: October 2009

“UCD” SERIES

AUTOMATIC FILL, UNDER-COUNTER HOT WATER DISPENSERS

CONTENTS

Section: Page No:

Contents p.1

Introduction p.2

Principle of Operation p.2

1 .0 Technical Specifications p.3

2.0 Installation Checklists p.4

3.0 The LCD Display p.5

4.0 Temperature Adjustment p.6

5.0 Water Dispense settings & adjustment p.6

6.0 Sensing Probes p.7 - 8

7.0 Thermistor p.7

8.0 Heating Elements p.8

9.0 Triac p.9

10.0 Printed Circuit Boards p.9 - 11

11.0 Transformer p.12

12.0 Hot Water Pump p.12

13.0 Hot Water Gate-Valve & Recirculation p.12 - 13

14.0 Thermal Cut-outs p.13

15.0 Solenoid Valve p.14

16.0 Hot Water Dispense Font p.14 - 15

17.0 Storage Tank p.15

18.0 De-scaling p.15 - 16

19.0 Fault-Finding p.17 - 18

20.0 Warning Messages p.19 - 20

21.0 Exploded Drawings & key p.21 - 24

22.0 Wiring Diagrams p.25 - 26

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Summary

Introduction

Principle of Operation

Explains how the UCD dispenser operates, including heating and dispensing cycles.

Technical Specifications

Installation Checklist

LCD Display and Programming

Temperature Adjustment

Water Dispense Volume Adjustment

Explains how to configure measured volume or on-demand dispensing for the UCD series.

Sensing Probes

Thermistor Installation and Function

Heating Elements and Boil-Dry Protection

Triac and Printed Circuit Boards

PCB Diagnostics and Warnings

Critical Warnings and Other PCBs

Transformer and Hot Water Pump

Gate-Valve and Recirculation Mode

Thermal Cut-Outs

Over-Boil and Boil-Dry Protection

Explains the function and reset procedure for over-boil and boil-dry thermal cut-outs.

Solenoid Valve and Dispense Font

De-scaling Instructions

Fault Finding

Machine Symptoms and Causes

Lists symptoms like 'Dead', 'Overfilling', 'Not Filling' with their causes.

Fault Finding: Additional Symptoms

Resets, Dispensing, Noise, and Heating Issues

Service Warning Messages

Simple Warnings: Check Water, No Water, Clean Probes

Critical Warning Messages

Thermistor, Heat;Therm Fail, Overfill, Mains PCB Comms