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HiRef HTI-120 - User Manual

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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

  • J
    Jake AlvaradoAug 5, 2025
    How to troubleshoot a HiRef HTI-120 that does not start?
    • S
      Steve MorenoAug 5, 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.
  • W
    Walter SanchezAug 9, 2025
    What to do if the compressor of my HiRef HTI-120 Air Conditioner does not start?
    • M
      Michael RhodesAug 9, 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.
  • P
    Pamela BanksAug 18, 2025
    How to fix a noisy compressor in my HiRef HTI-120 Air Conditioner?
    • D
      Donald PriceAug 18, 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.
  • H
    Heidi BradleyAug 22, 2025
    What causes low evaporation pressure in a HiRef HTI-120?
    • N
      nichole27Aug 22, 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.
  • E
    elizabethbarreraAug 27, 2025
    Why is my HiRef HTI-120 Air Conditioner leaking water?
    • T
      thomasmcdonaldAug 27, 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.
  • R
    Roger NicholsonAug 30, 2025
    What to do for low condensation pressure in HiRef HTI-120?
    • M
      Matthew FosterAug 30, 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
    Lindsey NormanNov 13, 2025
    Why is there abnormally high pressure in my HiRef HTI-120 Air Conditioner?
    • C
      Christopher McphersonNov 13, 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

Structure

Details the construction materials and finishing of the HTS units, including base and panels.

Field of application

Defines the operational limits for HTS units and the warranty implications of exceeding them.

Cooling circuit

Describes the cooling circuit components and the electric control board's compliance with directives.

Hydraulic section

Explains the three-way valve functionality for water flow regulation and technical characteristics.

Installation warnings

Provides critical safety warnings and rules for unit installation and maintenance personnel.

Inspection; Transport

Inspection on receipt

Instructions for checking unit integrity upon delivery and reporting any transport damage.

Lifting and transport

Guidelines for safe and careful handling, lifting, and transport of the unit to prevent damage.

Unpacking

Recommendations for proper removal of packaging materials and environmental disposal.

Installation

HTI - Indoor unit positioning

Guidance on selecting the best site for indoor unit installation, considering connections and support.

Free-cooling duct connections (optional)

Details the optional free-cooling device, its function, and connection points for outside air.

Electrical Connections

Generalities

General safety precautions and compatibility checks for mains electricity supply for unit connection.

Starting up for the first time

Step-by-step instructions for the initial electrical connection and setup of the unit.

Starting operation

Procedure for starting the unit operation, including control panel selection and checks.

Operating Parameters Setting

Generalities

Overview of factory-set control devices and the importance of checking operating and safety parameters.

Maintenance

Warnings

Crucial safety warnings for maintenance operations, emphasizing qualified personnel and power disconnection.

Periodical checks

Schedule and description of routine maintenance checks to ensure optimal and long-term unit performance.

Troubleshooting

HiRef HTI-120 Specifications

General IconGeneral
BrandHiRef
ModelHTI-120
CategoryAir Conditioner
LanguageEnglish

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