Lauda ULTRACOOL UC 8 User Manual (English)

Sheila JohnsonAug 3, 2025

What to do if my Lauda ULTRACOOL UC 8 Chiller shows an HP alarm due to a pressure switch?

N
Nichole MooreAug 3, 2025
If your Lauda Chiller displays an HP alarm related to the pressure switch, several factors could be the cause. First, ensure that the lateral panels of the housing are closed. Next, check for adequate airflow into the condenser, ensuring there is enough free space and cleaning the condenser if it's dirty. If the ambient temperature is too high, wait for it to decrease. Should the motor fan not be working (not turning when the chiller is running), or if you suspect a high-pressure switch failure, contact authorized technical service.

Brand	Lauda
Model	ULTRACOOL UC 8
Category	Chiller
Language	English

Brand

Lauda

Model

ULTRACOOL UC 8

Warnings

Disposal of Waste Equipment

Proper disposal of waste equipment in the European Union.

Introduction

General Notes

General information and recommendations for using the water chiller.

Safety Regulations

Operator responsibilities and guidelines for maintenance and repair safety.

Installation

Reception and Inspection

Procedures for inspecting the unit upon receipt for transport damage.

Transportation

Guidelines for keeping the unit upright and handling during transport.

Site Requirements

Specifies atmospheric conditions, floor support, and clearance space for installation.

Identification Labels

Describes various labels found on the Ultracool unit for identification.

Water Connection

Instructions for connecting the water inlet and outlet pipes and pressure drop considerations.

Electrical Connection

Details operating voltage, RCD requirements, and power supply connections.

Remote On/Off Operation

How to control the unit's operation remotely via terminals.

External Solenoid Valve Connection

Connects a solenoid valve for preventing backflow when the chiller stops.

External Alarm Report Signal

Provides a dry contact for reporting general chiller alarms.

Startup

Operating Conditions

Specifies permissible water and ambient air temperatures for operation.

Antifreeze Adjustment

Details required ethylene glycol concentrations for different ambient temperatures.

Chiller Startup Procedure

Step-by-step guide to starting the chiller, including filling the tank.

Pump Priming

Procedure to remove air from the pump to ensure proper operation.

Pump Rotation Direction Check

How to verify the pump is rotating in the correct direction.

Adjusting Water Outlet Valve

How to adjust the valve for correct pump pressure.

Setting Outlet Temperature

How to select the desired cold water outlet temperature.

Chiller Controls

Control and Monitoring Elements

Description of Status LED, Warning/Alarm LED, Main Power Switch, and displays.

UC Controller Interface

Details the main screen showing outlet temperature and setpoint.

Operation

Remote and Display Operation

How to turn the unit On/Off using remote signals or the display.

Setting Operating Temperature

Procedure to set the desired outlet temperature via the display.

Preheating Function

Disabling Preheating

How to disable the preheating system by setting a minimum temperature.

Ethernet Configuration

IP Configuration

Detailed steps for setting static IP, Mask, GW, and DNS for network connection.

Maintenance

Basic Maintenance Schedule

Outlines weekly, monthly, and yearly maintenance tasks for the unit.

Troubleshooting

Saving Log Files for Troubleshooting

Procedure to export log files to assist service engineers in diagnosing issues.

Alarms and Warnings List

Lists faults, their causes, solutions, and restart procedures.

Compressor Overload Alarm

Details cause, solution, and restart for compressor overload.

Circuit Power Offline Alarm

Explains causes and restart for circuit power offline or drive alarms.

Tank Level Alarm

Addresses issues related to the tank level switch and water leaks.

Pump Overload and Phase Sequence

Covers pump overload and phase sequence errors affecting unit operation.

Chilled Water High Temperature

Discusses high chilled water temperature warnings and related checks.

Discharge/Suction Pressure Probe Error

Addresses errors related to discharge and suction pressure probes.

External Controller Display Issues

Covers issues like "NO LINK" or a blank display on the external controller.

Maintenance Request Warning

Explains the warning for exceeding defined preventive maintenance hours.

Technical Features

Technical Specifications Table

Table detailing cooling capacity, water flow, pressure, and power for different models.

UC 8 Energy Efficiency

Details energy performance parameters like SEPR and electricity consumption for the UC 8 model.

UC 14 Energy Efficiency

Details energy performance parameters like SEPR and electricity consumption for the UC 14 model.

UC 24 Energy Efficiency

Details energy performance parameters like SEPR and electricity consumption for the UC 24 model.

UC 50 Energy Efficiency

Details energy performance parameters like SEPR and electricity consumption for the UC 50 model.

UC 65 Energy Efficiency

Details energy performance parameters like SEPR and electricity consumption for the UC 65 model.

Log Book

Log Book Entries

Template for recording operational data and maintenance activities.

Annexes

Water Quality Parameters

Specifies required physical/chemical properties for cooling water to prevent damage.

MSDS RefriFluid B

Technical sheet and instructions for use of RefriFluid B concentrate.

Lauda ULTRACOOL UC 8 User Manual

Table of Contents

Questions and Answers:

Lauda ULTRACOOL UC 8 Specifications

Summary