Nortek GKU18USV4DH Installation Instructions & Owner's Manual

Dc inverter u-match series cassette type unit

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Nortek Global HVAC, LLC

Please read this owner's manual carefully before operation and retain it for future reference

Specifications & illustrations subject to change without notice or incurring obligations

DC Inverter U-Match Series

Cassette Type Unit

Installation Instructions / Owner's Manual

Heat Pump

Indoor Unit

GKU18(5.3)USV4DH

GKU24(7.0)USV4DH

GKU30(8.8)USV4DH

GKU36(10.6)USV4DH

GKU42(12.3)USV4DH

GKU48(14.1)USV4DH

Outdoor Unit

GXH18(5.3)USV4DH

GXH24(7.0)USV4DH

GXH30(8.8)USV4DH

GXH36(10.6)USV4DH

GXH42(12.3)USV4DH

GXH48(14.1)USV4DH

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Page 1 Nortek Global HVAC, LLC DC Inverter U-Match Series Cassette Type Unit Installation Instructions / Owner's Manual Heat Pump Indoor Unit Outdoor Unit GKU18(5.3)USV4DH GXH18(5.3)USV4DH GKU24(7.0)USV4DH GXH24(7.0)USV4DH GKU30(8.8)USV4DH GXH30(8.8)USV4DH GKU36(10.6)USV4DH GXH36(10.6)USV4DH GKU42(12.3)USV4DH GXH42(12.3)USV4DH GKU48(14.1)USV4DH GXH48(14.1)USV4DH Please read this owner’s manual carefully before operation and retain it for future reference...
Page 3: Table Of Contents
Contents 1 Safety Precautions................1 2 Outline of the Unit and Main Parts ............3 3 Preparative for Installation ..............4 3.1 Standard Accessory Parts ................4 3.2 Selection of the Installation Location ............5 3.3 Connection Pipe Requirement ..............7 3.4 Electrical Requirement .................
Page 5: Safety Precautions
DC Inverter U-match Series Cassette Type Unit 1 Safety Precautions WARNING NOTICE: Failure to comply with warning notice could result in property damage, serious personal injury or death. CAUTION NOTICE: Failure to comply with caution notice could result in property damage or personal injury.
Page 6 DC Inverter U-match Series Cassette Type Unit (15). During pump-down, stop the compressor before removing the refrigerant piping. If the compressor is still running and the stop valve is open during pump-down, air will be sucked in when the refrigerant piping is removed, causing abnormal pressure in the freezer cycle which will lead to breakage and even injury.
Page 7: Outline Of The Unit And Main Parts
DC Inverter U-match Series Cassette Type Unit 2 Outline of the Unit and Main Parts Fig. 2.1 The connection pipe, drain pipe, power cord, and duct for this unit should be prepared by a qualified technician.
Page 8: Preparative For Installation
DC Inverter U-match Series Cassette Type Unit 3 Preparation for Installation 3.1 Standard Accessory Parts The standard accessory parts listed below are furnished and should be used as required. Table 3.1 Indoor Unit Accessories Name Appearance Q'ty Usage To connect with the hard Drain Hose PVC drain pipe To fix the hook on the...
Page 9: Selection Of The Installation Location
DC Inverter U-match Series Cassette Type Unit Table 3.2 Outdoor Unit Accessories Name Appearance Q'ty Usage Drain Plug 1 or 3 To plug the unused drain hole To connect with the hard PVC Drainage Connecter drain pipe 3.2 Selection of the Installation Location Check the support structure to verify that it has sufficient load-carrying capacity to support the weight of the unit, and it can be securely mounted.
Page 10 DC Inverter U-match Series Cassette Type Unit Note: If the unit is mounted in a kitchen or dining room, there may be build-up of greasy dirt on the fan, heat exchanger and water pump. This will reduce the effectiveness of the system and may cause it to malfunction.
Page 11: Connection Pipe Requirement
DC Inverter U-match Series Cassette Type Unit freely during heating operation. (4). Do not place animals and plants in the path of the warm air. (5). Check the support structure to verify that it has sufficient load-carrying capacity to support the weight of the unit. Mount the unit securely to reduce vibration noise.
Page 12: Electrical Requirement
DC Inverter U-match Series Cassette Type Unit GKU48(14.1)USV4DH Φ25×1.5 9.5(3/8) 16(5/8) 70(230) 15(49-1/4) (Φ1 X 1/16) GXH48(14.1)USV4DH Notes: The connection pipe should be insulated with proper water-proof material. The pipe wall thickness shall be 0.5~1.0mm (0.02~0.04 inch) and the pipe wall shall be able to withstand the pressure of 6.0MPa (870psig).
Page 13: Installation Of The Unit
DC Inverter U-match Series Cassette Type Unit Use 2 pieces of power cord of 0.75mm (AWG18) as the communication lines between indoor and outdoor unit, with their longest lengths of 50m (164feet). Please select the appropriate line length per the actual installation conditions.
Page 14 DC Inverter U-match Series Cassette Type Unit Table 4.1 Unit: mm (inch) Item Model GKU18(5.3) USV4DH (26-3/8) (23-7/16) (23-1/4) (22-5/8) (5-3/4) (9-1/2) (26-1/8) (9-1/4) (22-5/8) (19-7/8) For the units: GKU24(7.0)USV4DH ~ GKU42(12.3)USV4DH Table 4.2 Unit: mm (inch) Item Model GKU24(7.0)USV4DH (37-3/8) (33-1/8) (30-3/4)
Page 15 DC Inverter U-match Series Cassette Type Unit For the units: GKU48(14.1)USV4DH Fig. 4.1 Table 4.3 Unit: mm (inch) Item Model GKU48(14.1) 1040(41) 910(35-7/8) 842(33-1/8) 788(31) 170(6-3/4) 290(11-3/8) USV4DH 4.1.2 Installing the Main Body Unit Fig. 4.2 (1). Install the hoisting stand on the hoisting screw by using nuts and gaskets at both the upper and lower sides of the hoisting stand.
Page 16 DC Inverter U-match Series Cassette Type Unit vent. (3). Adjust the unit to the best position. (4). Check if the unit is installed level in four directions. If not, the water pump and the float switch will malfunction and may cause leakage. (5).
Page 17: Installation Of The Outdoor Unit
DC Inverter U-match Series Cassette Type Unit 4.2 Installation of the Outdoor Unit Install the unit where it will not be tilted by more than 5°. During installation, if the outdoor unit has to be exposed to strong wind, it must be fixed securely. 4.2.1 Outdoor unit dimension Fig.
Page 18: Installation Of The Connection Pipe
DC Inverter U-match Series Cassette Type Unit located at the base plate of the unit and then connect the drain pipe to the pipe joint. Fig. 4.8 4.3 Installation of the Connection Pipe 4.3.1 Flare Proces (1). Cut the connection pipe with pipe cutter and remove the burrs. (2).
Page 19 DC Inverter U-match Series Cassette Type Unit (2). Do not bend the pipes in an angle more than 90°. (3). When pipes repeatedly bent stretched, the material will weaken making it more likely to break. Do not bend or stretch the pipes more than three times.
Page 20 DC Inverter U-match Series Cassette Type Unit Fig. 4.12 Table 4.5 Flare nut tightening torque Pipe Diameter Tightening Torque 6mm (1/4inch) 15~30N·m (11~22ft.-lb.) 9.5mm (3/8inch) 35~40N·m (26~29ft.-lb.) 12.7mm (1/2inch) 45~50N·m (33~37ft.-lb.) 16mm (5/8inch) 60~65N·m (44~48ft.-lb.) Be sure to connect the gas pipe after connecting the liquid pipe completely. 4.3.4 Connecting the Pipe at the Outdoor Side Unit Tighten the flare nut of the connection pipe at the outdoor unit valve connector.
Page 21 DC Inverter U-match Series Cassette Type Unit gas leakage detector. 4.3.6 Heat Insulation on the Pipe Joints (Indoor Side Only) Attach coupler heat insulation (large and small) to the pipe connections. Fig. 4.14 4.3.7 Liquid Pipe and Drain Pipe (1). If the outdoor unit is installed lower than the indoor unit (See Fig.
Page 22: Vacuum And Gas Leakage Inspection
DC Inverter U-match Series Cassette Type Unit (2). If the outdoor unit is installed higher than the indoor unit (See Fig. 4.16) 1). Wrap tape from the lower end working 2). All pipes must be bound and taped together. A trap must be installed to prevent water from returning to the room.
Page 23 DC Inverter U-match Series Cassette Type Unit can not be larger than 0.005MPa (0.72psig). (7). Slightly open the liquid valve and let some refrigerant into the connection pipe to balance the pressure inside and outside of the connection pipe, so that air will not come into the connection pipe when removing the hose.
Page 24: Installation Of The Drain Hose
DC Inverter U-match Series Cassette Type Unit When the height difference between the indoor unit and outdoor unit is more than 10m (33 feet), an oil bend should be employed for every 6m (20 feet). Fig. 4.18 4.5 Installation of the Drain Hose 4.5.1 Installation of Drain Piping (1).
Page 25 DC Inverter U-match Series Cassette Type Unit During the installation, distance from soft drain pipe to the gasket is “A” when the bolt is Insulate the pipe clamp and the drain hose tightened. It is not allowed to apply PVC or using heat insulation sponge.
Page 26 DC Inverter U-match Series Cassette Type Unit (5). If the air flow of indoor unit is high, this might cause negative pressure and result in return suction of outdoor air. Therefore, U-type water trap shall be designed on the drainage side of each indoor unit (Fig. 4.21). (6).
Page 27 DC Inverter U-match Series Cassette Type Unit Fig. 4.27 (2). Secure a downward gradient of 1/100 or more for the drain pipe. To accomplish this, mount supporting brackets at an interval of 1~1.5m (3~5feet). Fig. 4.28 4.5.4 Testing of Drain Piping After piping work is finished, check if drainage flows smoothly.
Page 28: The Panel Installation
DC Inverter U-match Series Cassette Type Unit Fig. 4.30 4.6 The Panel Installation 4.6.1 Precautions (1). See the Figure below for the relationship of the front panel and the connecting pipe. Fig. 4.31 (2). Panel must be securely fastened or condensate could leak from the unit as shown in Fig.
Page 29 DC Inverter U-match Series Cassette Type Unit Fig. 4.32 (3). If gap still exists between ceiling and decorative panel after tightening the screws, readjust the height of the indoor unit (Fig. 4.33). Fig. 4.33 (4). Wire the swing flap motor and lamps main body...
Page 30: Electrical Wiring
DC Inverter U-match Series Cassette Type Unit 4.35. (5). Tighten the screws until the thickness of the sealing material between the panel and the indoor unit reduces to 5~8mm (1/4~3/8inch). Fig. 4.35 4.7 Electrical Wiring 4.7.1 Wiring Precautions Before obtaining access to terminals, all supply circuits must be disconnected. The rated voltage of the unit is as shown as Table 3.5 and Table 3.6.
Page 31 DC Inverter U-match Series Cassette Type Unit Install a dedicated circuit breaker in accordance with the related laws and regulations and standards. The power source capacity must be the sum of the air conditioner current and the current of other electrical appliances. When the voltage is low, the air conditioner will not run properly.
Page 32 DC Inverter U-match Series Cassette Type Unit Fig. 4.37 Fig. 4.38 (3). How to fix connection cord and power cord with cord clamp After passing the connection cord and power cord through the insulation tube, fasten it with the cord clamp (Fig. 4.38). Before starting work, check that power is not being supplied to the indoor unit and outdoor unit.
Page 33 DC Inverter U-match Series Cassette Type Unit Single-phase units: 36k~42k...
Page 34 DC Inverter U-match Series Cassette Type Unit Single-phase units: 48k Fig. 4.39 (5). Electric wiring of indoor unit Remove the cover from the electric box sub-assy and then connect the wire. For the units: 18k~42k...
Page 35 DC Inverter U-match Series Cassette Type Unit For the units: 48k Fig. 4.40...
Page 36 DC Inverter U-match Series Cassette Type Unit The power cord and the wire of the fresh air valve are high-voltage, while the communication cord and connection wire of the wired controller are low-voltage. They should run separately to protect against electromagnetic interference. The high-voltage and low-voltage lines should pass through the rubber rings at different electric box covers.
Page 37: Installation Of Controllers
DC Inverter U-match Series Cassette Type Unit 5 Installation of Controllers Refer to the Installation Manual of the controller for more details. 6 Testing 6.1 Trial Operation and Testing (1). The meaning of error codes as shown below: Table 6.1 Number Error code Error...
Page 38 DC Inverter U-match Series Cassette Type Unit Compressor phase sequence protection Compressor stalling protection Power protection Indoor and outdoor mismatch 4-way valve direction changing protection Drive reset protection Over-current protection Communication error between main control and drive Drive module sensor error Drive module over temperature protection Zero passage protection AC current protection...
Page 39: Working Temperature Range
DC Inverter U-match Series Cassette Type Unit A red light indicates the unit has power running to it. A white light indicates the unit is running. Timer Indicating Lamp: A yellow light indicates the timer has been set. No light is shown when no timer setting has been selected.
Page 40: Troubleshooting And Maintenance
DC Inverter U-match Series Cassette Type Unit 7 Troubleshooting and Maintenance 7.1 Troubleshooting If your unit malfunctions or has an operation failure, please first check the following points before repair: Table 7.1 Failure Possible Reasons The power supply is not connected. Electrical short of air-conditioning unit causes tripping of the The unit cannot be started.
Page 41 DC Inverter U-match Series Cassette Type Unit Do not operate the air conditioner without the filter; otherwise dust would enter the unit. Do not remove the air filter except for cleaning. Unnecessary handling may damage the filter. Do not clean the unit with gasoline, benzene, paint thinner, polishing powder or liquid insecticide, otherwise it would cause discoloration and deformation of the unit.
Page 42 DC Inverter U-match Series Cassette Type Unit Push those two fasteners and open the panel grille. 2.Disassemble the air inlet grille Open the air inlet grille to a 45° angle, raise it and remove the grille. 3. Disassemble the filter screen Draw out the filter screen and remove it.

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Nortek GKU18USV4DH Installation Instructions & Owner's Manual

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