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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
If you have lost the owner's manual, please visit www.NortekHVAC.com for electronic
version
DC Inverter U-match Series
Floor Ceiling Type Unit
Installation Instructions / Owner's Manual
Heat Pump
Indoor Unit
GFU18(5.3)USV4DH
GFU24(7.0)USV4DH
GFU30(8.8)USV4DH
GFU36(10.6)USV4DH
GFU42(12.3)USV4DH
GFU48(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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Summary of Contents for Nortek GFU18USV4DH
- Page 1 Nortek Global HVAC, LLC DC Inverter U-match Series Floor Ceiling Type Unit Installation Instructions / Owner's Manual Heat Pump Indoor Unit Outdoor Unit GFU18(5.3)USV4DH GXH18(5.3)USV4DH GFU24(7.0)USV4DH GXH24(7.0)USV4DH GFU30(8.8)USV4DH GXH30(8.8)USV4DH GFU36(10.6)USV4DH GXH36(10.6)USV4DH GFU42(12.3)USV4DH GXH42(12.3)USV4DH GFU48(14.1)USV4DH GXH48(14.1)USV4DH Please read this owner’s manual carefully before operation and retain it for future reference Specifications &...
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Page 3: Table Of Contents
Contents 1 Safety Precautions ····················································································· 1 2 Outline of the Unit and Main Parts ····························································· 1 3 Pre-Installation Check List ········································································· 2 3.1 Standard Accessory Parts ············································································· 2 3.2 Installation Location Selection ······································································· 4 3.3 Pipe Connection Requirement ······································································· 5 3.4 Electrical Requirement ··················································································... -
Page 4: Safety Precautions
DC Inverter U-match Series Floor Ceiling 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 5: Pre-Installation Check List
DC Inverter U-match Series Floor Ceiling Type Unit Fig. 2.1 Installer must properly connect refrigeration pipe, drain pipe, power cord, and ductwork. 3 Pre-Installation Check List... -
Page 6: Standard Accessory Parts
DC Inverter U-match Series Floor Ceiling Type Unit 3.1 Standard Accessory Parts The standard accessory parts listed below are furnished and should be used as described. Table 3.1 Indoor Unit Accessories Name Appearance Q'ty Usage To secure the hook on the Nut with Washer cabinet of the unit Wireless Controller +... -
Page 7: Installation Location Selection
DC Inverter U-match Series Floor Ceiling Type Unit 3.2 Installation Location Selection 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. Do not install where there is a danger of combustible gas leakage. Do not install the unit near heat source, steam, or flammable gas. -
Page 8: Pipe Connection Requirement
DC Inverter U-match Series Floor Ceiling Type Unit 3.2.2 Outdoor Unit Install the unit where it will not be tilted by more than 5°. The outdoor unit should be securely mounted to withstand high wind. If possible, do not install the unit where it will be exposed to direct sunlight. (If necessary, install a blind that does not interfere with the air flow.) (1). -
Page 9: Electrical Requirement
DC Inverter U-match Series Floor Ceiling Type Unit Table 3.3 Max. Height Size of Fitting Pipe Drainage Max. Difference mm (inch) Item pipe(Outer Pipe between Indoor Diameter × wall Length Unit and Outdoor Model thickness) m (feet) Unit Liquid mm (inch) m (feet) GFU18(5.3)USV4DH Φ17X1.75... -
Page 10: Unit Installation
DC Inverter U-match Series Floor Ceiling Type Unit Table 3.5 Maximum Fuse Minimum Circuit Power Supply Overcurrent Capacity Ampacity Outdoor Units Protection V/Ph/Hz GXH18(5.3)USV4DH 208/230V ~ 60Hz GXH24(7.0)USV4DH 208/230V ~ 60Hz GXH30(8.8)USV4DH 208/230V ~ 60Hz GXH36(10.6)USV4DH 208/230V ~ 60Hz GXH42(12.3)USV4DH 208/230V ~ 60Hz GXH48(14.1)USV4DH 208/230V ~ 60Hz... - Page 11 DC Inverter U-match Series Floor Ceiling Type Unit Verify that the installation location has sufficient load-carrying capacity to support five (5) times the weight of the indoor unit. Mount on surface that will not amplify sound or vibration. If the unit is not mounted secuely, the indoor unit may fall and cause injuries. If the job is done with the panel frame only, there is a risk that the unit will come loose.
- Page 12 DC Inverter U-match Series Floor Ceiling Type Unit 4.1.3 Indoor Unit Installation (1). Determine the location of the hanger with the paper template, and then remove the paper template. Fig. 4.2 (2). Insert the anchor bolts into the drilled holes, and drive the pins completely into the anchor bolts with a hammer.
- Page 13 DC Inverter U-match Series Floor Ceiling Type Unit Ceiling type Fig. 4.4 (6). Adjust the height of the unit to make the drain pipe slant slightly downward so that the drainage will become much smoother. 4.1.4 Leveling The water level test must be done after installing the indoor unit to make sure the unit is level, as shown below.
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Page 14: Outdoor Unit Installation
DC Inverter U-match Series Floor Ceiling Type Unit 4.2 Outdoor Unit Installation 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 securely mounted. -
Page 15: Connection Pipe Installation
DC Inverter U-match Series Floor Ceiling Type Unit located at the base plate of the unit and then connect the drain pipe to the pipe joint. Fig. 4.7 4.3 Connection Pipe Installation 4.3.1 Flare Process (1). Cut the connection pipe with pipe cutter and remove the burrs. (2). - Page 16 DC Inverter U-match Series Floor Ceiling Type Unit (3). When pipes are repeatedly bent or stretched, the material will weaken making it more likely to break. Do not bend or stretch the pipes more than three times. (4). For best results, cut insulation before bending, as shown in fig.
- Page 17 DC Inverter U-match Series Floor Ceiling Type Unit Fig. 4.11 Fig. 4.12 Table 4.3 Flare nut tightening torque Pipe Diameter Tightening Torque 6mm (1/4inch) 15~30N·m (11~22ft.-1b.) 9.5mm (3/8inch) 35~40N·m (26~29ft.-1b.) 12.7mm (1/2inch) 45~50N·m (33~37ft.-1b.) 16mm (5/8inch) 60~65N·m (44~48ft.-1b.) Be sure to connect the gas pipe after connecting the liquid pipe completely. 4.3.4 Connecting the Pipe to the Outdoor Unit Tighten the flare nut of the connection pipe at the outdoor unit valve connector.
- Page 18 DC Inverter U-match Series Floor Ceiling Type Unit 4.3.5 Checking the Pipe Connections for Gas Leaks For both indoor and outdoor unit, be sure to check the joints for gas leaks with a gas leakage detector. 4.3.6 Heat Insulation on the Pipe Joints (Indoor Unit Only) Attach coupler heat insulation (large and small) to the pipe connections.
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Page 19: Vacuum And Gas Leakage Inspection
DC Inverter U-match Series Floor Ceiling Type Unit (2). If the outdoor unit is installed higher than the indoor unit 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 (See Fig. - Page 20 DC Inverter U-match Series Floor Ceiling Type Unit During this time, the reading of the pressure gauge at the low pressure side 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.
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Page 21: Drain Pipe Installation
DC Inverter U-match Series Floor Ceiling Type Unit When the height difference between the indoor unit and outdoor unit is more than 10m (32feet), an oil bend should be made for every 6m (20 feet). Fig. 4.18 4.5 Drain Pipe Installation (1). - Page 22 DC Inverter U-match Series Floor Ceiling Type Unit 4.5.2 Installing the Drain Pipes (1). To determine the position of the drain hose, follow these procedures. (2). Insert the drain pipe to the drain outlet of the unit and then secure the clamp with tape (Fig.
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Page 23: Electrical Wiring
DC Inverter U-match Series Floor Ceiling Type Unit Fig. 4.24 4.5.4 Testing of Drain Piping (1). After piping work is finished, check if drainage flows smoothly. (2). As shown in the Figure, pour water into the drain pan from the right side to check that water flows smoothly from the drain hose. - Page 24 DC Inverter U-match Series Floor Ceiling Type Unit The dedicated branch circuit breaker is installed in the permanent wiring. Always use a circuit that can trip all the poles of the wiring and has an isolation distance of at least 3mm (1/8inch) between the contacts of each pole.
- Page 25 DC Inverter U-match Series Floor Ceiling Type Unit Fig. 4.26 Fig. 4.27 Fig. 4.28 (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. 4.28). Before starting work, check that power is not being supplied to the indoor unit and outdoor unit.
- Page 26 DC Inverter U-match Series Floor Ceiling Type Unit (4). Electric wiring between the indoor and outdoor units Single-phase units (18k-30k) Single-phase units (36k-48k) Fig. 4.29 (5). Electric wiring of indoor unit side Remove the left cover plate and the electric box cover then insert the end of the communication cord and the power cable into the terminal board.
- Page 27 DC Inverter U-match Series Floor Ceiling 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.
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Page 28: Installation Of Controllers
DC Inverter U-match Series Floor Ceiling Type Unit Power lines should go along the right side plate. Communication lines between indoor and outdoor units also should go along the right side plate and kept away from power lines. 5 Installation of Controllers Refer to the Installation Manual of the controller for more details. - Page 29 DC Inverter U-match Series Floor Ceiling Type Unit PFC protection Activation failure 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...
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Page 30: Working Temperature Range
DC Inverter U-match Series Floor Ceiling Type Unit Indicating Lights: “POWER”: The indicating light will be one when power on, while it will go out when power off. “COOL”: Indicates “COOL” function is activated, while it will go out when “COOL”... - Page 31 DC Inverter U-match Series Floor Ceiling Type Unit first check the following points before calling for 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 won’t start circuit breaker.
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Page 32: Routine Maintenance
DC Inverter U-match Series Floor Ceiling Type Unit 7.2 Routine Maintenance Turn off the unit and cut off the main power supply when cleaning the air conditioner, otherwise electric shock may happen. When cleaning the cabinet, do not spray with water or other liquid or electric shock or short could occur. - Page 33 DC Inverter U-match Series Floor Ceiling Type Unit 5. Disassemble the electric box cover After removing the side board (cover plate), remove the screws holding the electrical box in place and remove cover. (2). Preseason Check List 1). Check if there are obstacles at the inlet or outlet vent. 2).
- Page 36 Specifications & illustrations subject to change without notice or incurring obligations. O’Fallon, MO (11/16) © Nortek Global HVAC, LLC 2016. All Rights Reserved. 631E-1116...
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