{"id":85,"date":"2026-10-13T05:49:11","date_gmt":"2026-10-13T05:49:11","guid":{"rendered":"https:\/\/oulairuinahvac.com\/product\/direct-expansion-air-handling-unit\/"},"modified":"2026-10-30T04:54:46","modified_gmt":"2026-10-30T04:54:46","slug":"direct-expansion-air-handling-unit","status":"publish","type":"product","link":"https:\/\/oulairuinahvac.com\/th\/product\/direct-expansion-air-handling-unit\/","title":{"rendered":"Direct expansion unit"},"content":{"rendered":"\n\n\n
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Direct expansion unit<\/p>\n\n\n

Overview<\/h2>\n\n\n

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.<\/p>\n\n\n

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.<\/p>\n\n\n

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.<\/p>\n<\/div>\n\n\n\"Direct\n<\/div>\n<\/div>\n<\/section>\n\n\n

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PRODUCT DETAILS<\/p>\n\n\n

Product Features<\/h2>\n\n\n
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Matched indoor and outdoor sections<\/h3>\n\n\n

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.<\/p>\n<\/article>\n\n\n

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Direct refrigerant heat exchange<\/h3>\n\n\n

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.<\/p>\n<\/article>\n\n\n

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Modular treatment stages<\/h3>\n\n\n

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.<\/p>\n<\/article>\n\n\n

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Choice of filtration<\/h3>\n\n\n

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.<\/p>\n<\/article>\n\n\n

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Insulated sealed cabinet<\/h3>\n\n\n

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.<\/p>\n<\/article>\n\n\n

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Optional intelligent controls<\/h3>\n\n\n

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.<\/p>\n<\/article>\n<\/div>\n\n\n

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MODEL DATA<\/p>\n\n\n

Technical Specifications<\/h3>\n\n\n

RNZK-R direct-expansion purification air-handling series. Catalogue pages 25\u201326.<\/p>\n\n\n

Swipe tables horizontally to view all specifications.<\/p>\n\n\n

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Airflow, Fan and Cabinet Data<\/caption>\n\n\n
Model<\/th>\n\n\nAirflow (m\u00b3\/h)<\/th>\n\n\nListed power (kW)<\/th>\n\n\nExternal pressure (Pa)<\/th>\n\n\nNoise (dB)<\/th>\n\n\nIndoor cabinet L \u00d7 W \u00d7 H (mm)<\/th>\n<\/tr>\n<\/thead>\n\n\n
RNZK-15R<\/th>\n\n\n1500<\/td>\n\n\n2.2<\/td>\n\n\n400<\/td>\n\n\n50<\/td>\n\n\n3200 \u00d7 1000 \u00d7 1000<\/td>\n<\/tr>\n\n\n
RNZK-20R<\/th>\n\n\n2000<\/td>\n\n\n2.2<\/td>\n\n\n400<\/td>\n\n\n52<\/td>\n\n\n3200 \u00d7 1000 \u00d7 1000<\/td>\n<\/tr>\n\n\n
RNZK-30R<\/th>\n\n\n3000<\/td>\n\n\n3<\/td>\n\n\n420<\/td>\n\n\n55<\/td>\n\n\n3300 \u00d7 1000 \u00d7 1000<\/td>\n<\/tr>\n\n\n
RNZK-40R<\/th>\n\n\n4000<\/td>\n\n\n3<\/td>\n\n\n450<\/td>\n\n\n56<\/td>\n\n\n3200 \u00d7 1000 \u00d7 1000<\/td>\n<\/tr>\n\n\n
RNZK-50R<\/th>\n\n\n5000<\/td>\n\n\n4<\/td>\n\n\n500<\/td>\n\n\n57<\/td>\n\n\n3400 \u00d7 1000 \u00d7 1000<\/td>\n<\/tr>\n\n\n
RNZK-60R<\/th>\n\n\n6000<\/td>\n\n\n4<\/td>\n\n\n500<\/td>\n\n\n59<\/td>\n\n\n3600 \u00d7 1000 \u00d7 1000<\/td>\n<\/tr>\n\n\n
RNZK-70R<\/th>\n\n\n7000<\/td>\n\n\n4<\/td>\n\n\n520<\/td>\n\n\n60<\/td>\n\n\n3600 \u00d7 1000 \u00d7 1000<\/td>\n<\/tr>\n\n\n
RNZK-80R<\/th>\n\n\n8000<\/td>\n\n\n5.5<\/td>\n\n\n520<\/td>\n\n\n60<\/td>\n\n\n3600 \u00d7 1000 \u00d7 1000<\/td>\n<\/tr>\n\n\n
RNZK-100R<\/th>\n\n\n10000<\/td>\n\n\n7.5<\/td>\n\n\n600<\/td>\n\n\n62<\/td>\n\n\n3800 \u00d7 1000 \u00d7 1000<\/td>\n<\/tr>\n\n\n
RNZK-120R<\/th>\n\n\n12000<\/td>\n\n\n11<\/td>\n\n\n620<\/td>\n\n\n62<\/td>\n\n\n4000 \u00d7 1000 \u00d7 1000<\/td>\n<\/tr>\n\n\n
RNZK-150R<\/th>\n\n\n15000<\/td>\n\n\n11<\/td>\n\n\n620<\/td>\n\n\n64<\/td>\n\n\n4200 \u00d7 1000 \u00d7 1000<\/td>\n<\/tr>\n\n\n
RNZK-200R<\/th>\n\n\n20000<\/td>\n\n\n15<\/td>\n\n\n700<\/td>\n\n\n60<\/td>\n\n\n4000 \u00d7 1000 \u00d7 1000<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\n\n
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Thermal Duty<\/caption>\n\n\n
Model<\/th>\n\n\nCooling (kW)<\/th>\n\n\nHeating (kW)<\/th>\n\n\nElectric heating (kW)<\/th>\n<\/tr>\n<\/thead>\n\n\n
RNZK-15R<\/th>\n\n\n10.7<\/td>\n\n\n22.4<\/td>\n\n\n15<\/td>\n<\/tr>\n\n\n
RNZK-20R<\/th>\n\n\n24.3<\/td>\n\n\n25<\/td>\n\n\n20<\/td>\n<\/tr>\n\n\n
RNZK-30R<\/th>\n\n\n27.8<\/td>\n\n\n33.6<\/td>\n\n\n25<\/td>\n<\/tr>\n\n\n
RNZK-40R<\/th>\n\n\n35.3<\/td>\n\n\n39<\/td>\n\n\n30<\/td>\n<\/tr>\n\n\n
RNZK-50R<\/th>\n\n\n42<\/td>\n\n\n45<\/td>\n\n\n35<\/td>\n<\/tr>\n\n\n
RNZK-60R<\/th>\n\n\n65.6<\/td>\n\n\n60.5<\/td>\n\n\n40<\/td>\n<\/tr>\n\n\n
RNZK-70R<\/th>\n\n\n73<\/td>\n\n\n80<\/td>\n\n\n50<\/td>\n<\/tr>\n\n\n
RNZK-80R<\/th>\n\n\n67.5<\/td>\n\n\n97.5<\/td>\n\n\n50<\/td>\n<\/tr>\n\n\n
RNZK-100R<\/th>\n\n\n98<\/td>\n\n\n107<\/td>\n\n\n60<\/td>\n<\/tr>\n\n\n
RNZK-120R<\/th>\n\n\n125<\/td>\n\n\n155<\/td>\n\n\n70<\/td>\n<\/tr>\n\n\n
RNZK-150R<\/th>\n\n\n149<\/td>\n\n\n172<\/td>\n\n\n80<\/td>\n<\/tr>\n\n\n
RNZK-200R<\/th>\n\n\n101<\/td>\n\n\n217<\/td>\n\n\n80<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\n\n

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.<\/p>\n<\/div>\n\n<\/div>\n<\/section>\n\n\n

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WHERE IT WORKS<\/p>\n\n\n

Applications<\/h2>\n\n\n
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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.<\/p>\n\n\n

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.<\/p>\n\n\nSend Your Requirements \u2192<\/a>\n<\/div>\n\n\n