Direct expansion unit

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Direct expansion unit

A direct expansion indoor air handling unit coordinated with its outdoor refrigeration system.

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Direct expansion unit

Overview

The direct expansion unit combines an indoor air handling assembly with a matched outdoor refrigeration unit. Refrigerant pipework connects the two sections, and refrigerant evaporates in the indoor coil to remove heat from the airstream. This arrangement supplies a dedicated cooling source without relying on a central chilled-water plant.

The indoor unit uses modular air-treatment sections so filtration, cooling, dehumidification, heating or humidification can be arranged around the project brief. The catalogue describes an insulated, sealed cabinet construction intended for projects requiring coordinated temperature, humidity and air-cleanliness control.

The indoor and outdoor units, refrigerant pipe route and controls are selected as a system. The required air conditions and operating schedule determine the treatment stages; optional functions are configured for the application rather than assumed to be standard on every unit.

Direct expansion unit

PRODUCT DETAILS

Product Features

Matched indoor and outdoor sections

The indoor air handler and outdoor condensing section form a coordinated refrigeration system. Copper refrigerant pipework connects the equipment and is planned around the actual building route.

Direct refrigerant heat exchange

Refrigerant absorbs heat in the indoor evaporator coil. This removes the need for a separate chilled-water distribution loop for the unit’s cooling function.

Modular treatment stages

The catalogue includes cooling, drying, heating, humidification and filtration functions. The combination is selected to achieve the required leaving-air condition and the intended room duty.

Choice of filtration

Primary, medium-efficiency and higher-efficiency filtration can be specified, with additional treatment modules available for appropriate projects. Filter selection depends on the required air quality and acceptable pressure loss.

Insulated sealed cabinet

The modular cabinet construction focuses on rigidity, sealing, insulation and reduced thermal bridging. Access and internal arrangements are coordinated with the maintenance needs of the selected sections.

Optional intelligent controls

DDC or PLC control and variable-frequency options are listed in the catalogue. The selected control package coordinates temperature, humidity, fan operation and project interfaces.

MODEL DATA

Technical Specifications

RNZK-R direct-expansion purification air-handling series. Catalogue pages 25–26.

Swipe tables horizontally to view all specifications.

Airflow, Fan and Cabinet Data
Model Airflow (m³/h) Listed power (kW) External pressure (Pa) Noise (dB) Indoor cabinet L × W × H (mm)
RNZK-15R 1500 2.2 400 50 3200 × 1000 × 1000
RNZK-20R 2000 2.2 400 52 3200 × 1000 × 1000
RNZK-30R 3000 3 420 55 3300 × 1000 × 1000
RNZK-40R 4000 3 450 56 3200 × 1000 × 1000
RNZK-50R 5000 4 500 57 3400 × 1000 × 1000
RNZK-60R 6000 4 500 59 3600 × 1000 × 1000
RNZK-70R 7000 4 520 60 3600 × 1000 × 1000
RNZK-80R 8000 5.5 520 60 3600 × 1000 × 1000
RNZK-100R 10000 7.5 600 62 3800 × 1000 × 1000
RNZK-120R 12000 11 620 62 4000 × 1000 × 1000
RNZK-150R 15000 11 620 64 4200 × 1000 × 1000
RNZK-200R 20000 15 700 60 4000 × 1000 × 1000
Thermal Duty
Model Cooling (kW) Heating (kW) Electric heating (kW)
RNZK-15R 10.7 22.4 15
RNZK-20R 24.3 25 20
RNZK-30R 27.8 33.6 25
RNZK-40R 35.3 39 30
RNZK-50R 42 45 35
RNZK-60R 65.6 60.5 40
RNZK-70R 73 80 50
RNZK-80R 67.5 97.5 50
RNZK-100R 98 107 60
RNZK-120R 125 155 70
RNZK-150R 149 172 80
RNZK-200R 101 217 80

Values are reproduced as printed. A dash means the catalogue cell is blank; it is not a zero value. Listed power is separate from the electric-heating rating. Confirm the final indoor/outdoor unit combination and design operating conditions during selection.

WHERE IT WORKS

Applications

The catalogue identifies laboratories, public-health and medical research facilities, biopharmaceutical production, food testing and electronics environments as applications requiring coordinated air treatment. The selected configuration must match the actual room classification and process brief.

Confirm airflow, cooling and heating duty, filtration, outdoor-unit location and refrigerant pipe limits. A stated application does not replace project-specific validation of the complete installation.

Send Your Requirements →
  • Research and testing laboratories requiring dedicated air-conditioning equipment.
  • Pharmaceutical or biotechnology spaces with defined air-treatment needs.
  • Food testing and production-related environmental control.
  • Electronics facilities needing controlled temperature, humidity and filtration.
Healthcare Buildings interior with coordinated ventilation and air distribution
Healthcare Buildings Air treatment coordinated with healthcare building requirements.
Laboratories interior with coordinated ventilation and air distribution
Laboratories Project ventilation selected for the laboratory application.

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