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HiRef HTI-CW Series - User Manual

HiRef HTI-CW Series
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Chilled water unit
HTI
_CW
H T I - CW
Packaged Air Conditioning Unit
Users Manual
HF61G00269SB HTI-0-UM-GB_
CW
Rev. 20-05-201
5
GB
HIGH
TECHNOLOGY
IN
REFRIGERATION
DEVICES

Table of Contents

Questions and Answers

  • W
    woneillAug 1, 2025
    How to troubleshoot a HiRef HTI-CW Air Conditioner that does not start?
    • D
      David BeckerAug 1, 2025
      If your HiRef Air Conditioner unit isn't starting, several factors could be at play. First, ensure that power is being supplied to both the primary and auxiliary circuits. Then, check the fuses to see if the electronic card is receiving power. Alarms might be preventing the unit from starting, so check the microprocessor control panel for any signalled alarms, address the causes, and then restart the unit. Finally, a wrong phase sequence could be the issue; if so, invert two phases in the primary power line after disconnecting them upstream from the unit.
  • C
    christopher88Aug 5, 2025
    What to do if the compressor of my HiRef HTI-CW Air Conditioner does not start?
    • J
      jillthomasAug 5, 2025
      If the compressor in your HiRef Air Conditioner isn't starting, the circuit breakers or line fuses might have been tripped by a short circuit. To resolve this, pinpoint the cause by measuring the resistance of the individual windings and the insulation from the casing before restoring power. Also, check if one of the HP or LP pressure switches has tripped and eliminate the causes using the microprocessor. Lastly, verify the phase sequence relay, as the phases might have been inverted in the distribution compartment.
  • E
    ekaneAug 13, 2025
    How to fix a noisy compressor in my HiRef HTI-CW Air Conditioner?
    • J
      Janice GarciaAug 14, 2025
      If the compressor in your HiRef Air Conditioner is unusually noisy, it might be rotating in the wrong direction. To fix this, check the phase sequence relay. Then, invert the phases on the terminal board after disconnecting the unit and contact the manufacturer.
  • J
    Jake RojasAug 17, 2025
    What causes low evaporation pressure in a HiRef HTI-CW?
    • J
      Jimmy CrossAug 17, 2025
      If you're experiencing low evaporation pressure in your HiRef Air Conditioner, it could be due to several reasons. A malfunctioning thermostatic valve might be the cause; try warming the bulb with your hand to see if the valve opens, and adjust it if necessary, replacing it if it doesn't respond. Additionally, a clogged filter dryer could be the issue; pressure drops upstream and downstream from the filter should not exceed 2°C, so replace the filter if they do. Low condensation temperature can also lead to this problem, so check the efficiency of the condensation control device, if present. Lastly, a low level of refrigerant might be the cause; check the refrigerant level by measuring the degree of Sub-cooling, and if it is below 2°C, replenish the charge.
  • R
    Rebecca BaldwinAug 22, 2025
    Why is my HiRef HTI-CW leaking water?
    • T
      Troy BuckleyAug 22, 2025
      If water is leaking from your HiRef Air Conditioner, it might be due to a few reasons. First, check if the drain pan hole is blocked and clean it by opening the front panels and removing the sheet metal just below the e-panel (for down flow units). Also, ensure that the siphon is present and provide a new one if it's missing. Lastly, make sure the unit is perfectly level by adjusting its placement.
  • L
    Laura BlankenshipAug 27, 2025
    What to do for low condensation pressure in HiRef HTI-CW?
    • G
      Garrett ParrishAug 27, 2025
      If you're seeing low condensation pressure in your HiRef Air Conditioner, the transducer might be faulty. Check the efficiency of the condensation control device (if your unit has this optional feature).
  • L
    Leslie CameronNov 8, 2025
    Why is there abnormally high pressure in my HiRef HTI-CW Air Conditioner?
    • S
      sabrina81Nov 8, 2025
      If you notice abnormally high pressure in your HiRef Air Conditioner, start by checking for any obstructions in the condenser section ventilation circuit that might be restricting airflow through the condenser. Also, inspect the condenser coil surface to ensure it's not obstructed. If there's air in the refrigerant circuit, indicated by bubbles in the flow indicator and sub-cooling values exceeding 5 °C, drain and pressurise the circuit to check for leaks, then evacuate slowly (for more than 3 hours) until reaching a pressure of 0.1 Pa and recharge in the liquid phase. If the unit is overcharged, shown by a Sub-cooling of more than 8 °C, drain the circuit. Finally, check the temperatures upstream and downstream from the thermostatic valve and filter and replace them if necessary, as they m...

Summary

General Description

1.1 Structure

Physical build of HTS units: galvanized steel base and panels with epoxy polyester coating.

1.2 Field of application

Defines the operating limits for HTS units; non-compliance invalidates warranty.

1.3 Cooling circuit

Describes the cooling circuit components and compliance with Directive 97/23 for manufacturing.

1.4 Hydraulic section

Details the three-way valve used for inlet water flow regulation in the HTI0105 version.

1.5 Installation warnings

Provides essential safety rules and precautions for unit installation and maintenance work.

Inspection; Transport

2.1 Inspection on receipt

Procedure for checking unit integrity upon delivery and reporting damages to the carrier and HiRef.

2.2 Lifting and transport

Guidelines for safe and careful handling during unit unloading and positioning to prevent damage.

2.3 Unpacking

Recommendations for careful packaging removal to avoid unit damage and for proper waste disposal.

Installation

3.1 HTI - Indoor unit positioning

Key aspects to consider when selecting the best site for indoor unit installation and connections.

3.2 Free-cooling duct connections (optional)

Details on the optional integrated free-cooling device and its specific duct connections.

Electrical Connections

4.1 Generalities

General precautions and requirements for electrical connections, including power supply and wiring.

4.2 Starting up for the first time

Step-by-step guide for performing the initial electrical connection and startup procedures.

4.3 Starting operation

Instructions on how to start the unit's operation after initial setup.

Operating Parameters Setting

5.1 Generalities

General notes on control devices and parameter settings, including password protection.

Maintenance

6.1 Warnings

Critical safety warnings for maintenance operations, emphasizing qualified personnel.

6.2 Periodical checks

Recommended routine maintenance and checks to ensure satisfactory performance over time.

Troubleshooting

HiRef HTI-CW Series Specifications

General IconGeneral
BrandHiRef
ModelHTI-CW Series
CategoryAir Conditioner
LanguageEnglish

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