Nortek U-match Series Original instructions

Nortek Global HVAC, LLC
Owner's Manual / Installation Instructions
Heat Pump
Indoor Unit Outdoor Unit
GDU18(5.3)USV4DH GXH18(5.3)USV4DH
GDU24(7.0)USV4DH
GDU30(8.8)USV4DH
GXH24(7.0)USV4DH
GXH30(8.8)USV4DH
GDU36(10.6)USV4DH GXH36(10.6)USV4DH
GDU42(12.3)USV4DH
GDU48(14.1)USV4DH
GXH42(12.3)USV4DH
GXH48(14.1)USV4DH
DC Inverter U-match Series
Duct Type Unit
ƽPlease read this owner’s manual carefully before operation and retain it for future reference
ƽSpecifications & illustrations subject to change without notice or incurring obligations
ƽIf you have lost the owner’s manual, please visit www.NortekHVAC.com for electronic version.

Contents

1 Safety Precautions ························································································ 1
2 Outline of the Unit and Main Parts ······························································ 2
3 Pre-Installation Check List ··········································································· 3
3.1 Standard Accessory Parts ········································································ 3
3.2 Selection of the Installation Location ··································································4
3.3 Pipe Connection Requirement ···········································································6
3.4 Electrical Requirement························································································7
4 Installation of the Unit ·················································································· 8
4.1 Installation of the Indoor Unit ··············································································8
4.2 Installation of the Outdoor Unit ·········································································11
4.3 Installation of the Connection Pipe ···································································12
4.4 Vacuum and Gas Leakage Inspection ·····························································16
4.5 Installation of the Drain Hose ···········································································18
4.6 Installation of the Duct ······················································································23
4.7 Electrical Wiring ································································································25
5 Installation of Controllers··········································································· 29
6 Testing·········································································································· 30
6.1 Trial Operation and Testing ··············································································30
6.2 Working Temperature Range ···········································································32
7 Unit Function ······························································································· 33
7.1 Setting Double Indoor Room Sensors ······························································33
7.2 Checking of Outdoor Ambient Temperature ····················································33
7.3 Fresh Air Control ·······························································································34
8 Troubleshooting and Maintenance ··························································· 34
8.1 Troubleshooting ································································································34
8.2 Routine Maintenance ························································································35

DC Inverter U-match Series Duct Type Unit
1
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.
NOTICE: Failure to comply with notice could result in property damage.
(1). Instructions for installation and use of this product are provided by the manufacturer.
(2). Installation must be performed by authorized personnel only.
(3). Please follow installation instructions as outlined in this manual..
(4). Use appropriate pipe connection material and appropriate electrical cord as outlined in this
manual.
(5). Installation work must be performed in accordance with local and national wiring standards by
authorized personnel only.
(6). If refrigerant leaks while work is being carried out, ventilate the area. If the refrigerant comes in
contact with a flame, it produces toxic gas.
(7). Do not power on until all installation work is complete.
(8). During installation, make sure that the refrigerant pipe is attached firmly before you run the
compressor.
zDo not operate the compressor with 2-way or 3-way valve open.
zThis may cause abnormal pressure in the refrigeration cycle that leads to compressor damage
or personal injury
(9). During the pump-down operation, make sure that the compressor is turned off before you remove
the refrigerant piping.
zDo not remove the connection pipe while the compressor is in operation.
zThis may cause abnormal pressure in the refrigerant cycle that leads to compressor damage or
personal injury.
(10). When installing the air conditioner, do not mix gases other than the specified refrigerant (R410A) to
enter the refrigerant cycle.
zIf air or other gas enters the refrigerant cycle, the pressure inside the cycle will rise to an
abnormally high value and cause compressor damage or personal injury..
(11). This appliance is not intended for use by persons (including children) with reduced physical,
sensory or mental capabilities, or lack of experience and knowledge.
(12). Children should be supervised to ensure that they do not play with the appliance.
(13). If the supply cord is damaged, it must be replaced with an appropriately sized cord.

DC Inverter U-match Series Duct Type Unit
2
2 Outline of the Unit and Main Parts
Fig. 2.1
ķ. Installer must properly connect refrigerant pipe, drain pipe, power cord, and ducworkt.
ĸ. The duct heater is arranged for use with rectangular duct.

DC Inverter U-match Series Duct Type Unit
3
3 Pre-Installation Check List
6WDQGDUG$FFHVVRU\3DUWV
The standard accessory parts listed below are furnished and should be used as
described.
Table 3.1
Indoor Unit Accessories
No. Name Appearance Q'ty Usage
1 Wired Controller 1 To control the indoor unit
2 Screw 2 To fix the base plate of
wired controller to the wall
3 Hanger or 4 To fix the indoor unit
4 Nut with Washer 8 To fix the hook on the
cabinet of the unit.
5 Nut with Washer 4 To fix the hook on the
cabinet of the unit
6 Nut 4
To be used with the
hanger bolt for installing
the unit
7 Washer 4
To be used with the
hanger bolt for installing
the unit
8 Insulation 1 To insulate the gas pipe
9 Insulation 1 To insulate the liquid pipe
10 Fastener 4 To fasten the sponge
11 Sponge 2 To insulate the drain pipe
12 Nut 1 To connect liquid pipe
13 Nut 1 To connect gas pipe

DC Inverter U-match Series Duct Type Unit
4
Table 3.2
Outdoor Unit Accessories
No. Name Appearance Q'ty Usage
1 Drain Plug 1 or 3 To plug the unused
drain hole
2 Drainage Connecter or 1 To connect with the
hard PVC drain pipe
3.2 Selection of the Installation Location
ķ. 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..
ĸ. Do not install where there is a danger of combustible gas leakage.
Ĺ. Do not install the unit near heat source, steam, or flammable gas.
ĺ. Children should be kept away from unit..
Decide the installation location with the customer as follows:
3.2.1 Indoor Unit
(1). Check the support structure to verify that it has sufficient load-carrying
capacity to support the weight of the unit.
(2). The air inlet and outlet of the unit should never be blocked so that the airflow
can reach every corner of the room.
(3). Leave service space around the unit as required in Fig. 3.1.
Fig. 3.1

DC Inverter U-match Series Duct Type Unit
5
(4). Install the unit where the drain pipe can be easily installed.
(5). The more space that is open above the unit, the easier it will be to service.
3.2.2 Outdoor Unit
ķ. Install the unit where it will not be tilted by more than 5°.
ĸ. The outdoor unit should be securely mounted to withstand high wind..
(1). 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.)
(2). Install the outdoor unit in a place where it will be free from dirt or rain as much
as possible.
(3). Install the outdoor unit where it is convenient to connect the indoor unit.
(4). Install the outdoor unit where the condensate water can be drained out freely
during heating operation. Do not place animals and plants in the path of the
warm air.
(5). Select a location where noise and vibration will be tolerated.
(6). 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. .
(7). Provide the space shown in Fig. 3.2, so that the air flow is not blocked. Also for
efficient operation, leave three of four directions of peripheral constructions
open.
Fig. 3.2

DC Inverter U-match Series Duct Type Unit
6
3.3 Pipe Connection Requirement
The maximum length of the connection pipe is listed in the table below. Do not place the units
where the distance exceeds the maximum length of the connection pipe.
Table 3.3
Item
Model
Size of Fitting Pipe
mm (inch)
Max. Pipe
Length
m (feet)
Max. Height
Difference
between
Indoor Unit
and Outdoor
Unit
m (feet)
Drainage
pipe(Outer
Diameter × wall
thickness)
mm (inch)
Liquid Gas
GDU18(5.3)USV4DH
GXH18(5.3)USV4DH 6(1/4) 12.7(1/2) 50(164) 15(49-1/5) Φ30X1.5
(Φ1-1/8 X 3/50)
GDU24(7.0)USV4DH
GXH24(7.0)USV4DH 9.5(3/8) 16(5/8) 50(164) 15(49-1/5) Φ20X1.2
(Φ3/4 X 6/125)
GDU30(8.8)USV4DH
GXH30(8.8)USV4DH 9.5(3/8) 16(5/8) 50(164) 15(49-1/5) Φ20X1.2
(Φ3/4 X 6/125)
GDU36(10.6)USV4DH
GXH36(10.6)USV4DH 9.5(3/8) 16(5/8) 50(164) 15(49-1/5) Φ20X1.2 (Φ3/4 X 6/125)
GDU42(12.3)USV4DH
GXH42(12.3)USV4DH 9.5(3/8) 16(5/8) 50(164) 15(49-1/5) Φ20X1.2
(Φ3/4 X 6/125)
GDU48(14.1)USV4DH
GXH48(14.1)USV4DH 9.5(3/8) 16(5/8) 70(230) 15(49-1/5) Φ20X1.2
(Φ3/4 X 6/125)
Notes:
ķ. The connection pipe should be insulated with proper water-proof material.
ĸ. 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). The shorter the
connecting pipe, the better the cooling and heating effect.

DC Inverter U-match Series Duct Type Unit
7
3.4 Electrical Requirement
Electric Wire Size and Fuse Capacity.
Table 3.4
Indoor Units
Power Supply Fuse Capacity
Minimum
Circuit
Ampacity
Maximum
Overcurrent
Protection
V/Ph/Hz A A A
GDU18(5.3)USV4DH 208/230V ~ 60Hz 5 1 15
GDU24(7.0)USV4DH
208/230V ~ 60Hz 5 2 15
GDU30(8.8)USV4DH 208/230V ~ 60Hz 5 2 15
GDU36(10.6)USV4DH 208/230V ~ 60Hz 5 3 15
GDU42(12.3)USV4DH 208/230V ~ 60Hz 5 3 15
GDU48(14.1)USV4DH
208/230V ~ 60Hz 5 5 15
Table 3.5
Outdoor Units
Power Supply Fuse Capacity
Minimum
Circuit
Ampacity
Maximum
Overcurrent
Protection
V/Ph/Hz A A A
GXH18(5.3)USV4DH 208/230V ~ 60Hz 5 17 25
GXH24(7.0)USV4DH 208/230V ~ 60Hz 5 24 40
GXH30(8.8)USV4DH 208/230V ~ 60Hz 5 24 40
GXH36(10.6)USV4DH 208/230V ~ 60Hz 5 29 45
GXH42(12.3)USV4DH 208/230V ~ 60Hz 5 31 50
GXH48(14.1)USV4DH 208/230V ~ 60Hz 5 45 70
Notes:
ķ. The fuse is located on the main board.
ĸ. Install the disconnect device with a contact gap of at least 3mm (1/8inch) in all
poles nearby the units (Both indoor unit and outdoor unit).The appliance must
be positioned so that the plug is accessible.
Ĺ. Use 2 pieces of power cord of 0.75mm2(AWG18) as the communication lines
between indoor and outdoor unit, with their longest lengths of 50m (164 feet).
Please select the appropriate line length per the actual installation conditions.
The communication lines cannot be twisted together. For the unit (İ30k), it’s
recommended to use 8m (26feet) long communication line.
ĺ. Take 2 pieces of power cord of 0.75mm2(AWG18) as the communication lines

DC Inverter U-match Series Duct Type Unit
8
between the wired controller and the indoor unit, with their longest lengths of
30m (98-1/2 feet). Please select the appropriate line length per the actual
installation conditions. The communication lines cannot be twisted together.
It’s recommended to use 8m (26 feet) long communication line.
Ļ. The wire size of the communication line should be no less than 0.75mm2
(AWG18). It’s recommended to take 0.75mm2(AWG18) power cords as the
communication line.
4 Installation of the Unit
4.1 Installation of the Indoor Unit
4.1.1 Indoor unit dimension
ķ. 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..
ĸ. If the unit is not mounted securely, the indoor unit may fall and cause injuries.
Ĺ. If the job is done with the panel frame only, there is a risk that the unit will come loose.
For the units: GDU18(5.3)USV4DH

DC Inverter U-match Series Duct Type Unit
9
For the units: GDU24(7.0)USV4DH ~ GDU42(12.3)USV4DH
For the units: GDU48(14.1)USV4DH
Fig. 4.1
Table 4.1 Unit: mm (inch)
Item
Model A B C D E F G H I J
GDU18(5.3)USV4DH 945
(37-1/4)
620
(24-3/8)
740
(29)
890
(35-1/8)
1035
(40-7/8)
720
(28-3/8)
740
(29)
125
(4-7/8)
205
(8)
265
(10-1/2)
GDU24(7.0)USV4DH 1100
(43-3/8)
515
(20-3/8)
820
(32-1/4)
1160
(45-5/8)
1280
(50-3/8)
560
(22)
1000
(39-1/2)
160
(6-1/4)
235
(9-1/4)
270
(10-1/2)
GDU30(8.8)USV4DH
GDU36(10.6)USV4DH 1010
(39-3/4)
750
(29-1/2)
820
(32-1/4)
1115
(43-7/8)
1225
(48-1/4)
775
(30-1/2)
980
(38-1/2)
160
(6-1/4)
230
(9-1/8)
290
(11-3/8)
GDU42(12.3)USV4DH
GDU48(14.1)USV4DH 1170
(46-3/8)
645
(25-3/8)
850
(33-1/2)
1150
(45-1/4)
1340
(52-3/4)
750
(29-1/2)
950
(37-1/2)
190
(7-1/2)
315
(12-1/2)
350
(13-3/4)

DC Inverter U-match Series Duct Type Unit
10
4.1.2 Drilling Holes for Bolts and Installing the Bolts
Using the installation template, drill holes for bolts (four holes) (Fig. 4.2).
4.1.3 Installing the Suspension Bolts
(1). Install the bolts to the ceiling at a place strong enough to hang the unit. Mark
the bolt positions from the installation template. With a concrete drill, drill four
12.7mm (1/2inch) diameter holes (Fig. 4.3).
(2). Insert the anchor bolts into the drilled holes, and drive the pins completely into
the anchor bolts with a hammer (Fig. 4.4).
(3). Install the hanger to the unit (Fig. 4.5).
(4). Pass the unit hangers over the bolts installed to the ceiling and install the unit
with the special nut (Fig. 4.6).


Fig.4.2 Fig.4.3 Fig.4.4

Fig.4.5

Fig.4.6

DC Inverter U-match Series Duct Type Unit
11
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.
Fig. 4.7
4.2 Installation of the Outdoor Unit
ķ
. Install the unit where it will not be tilted by more than 5°.
ĸ
. 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. 4.8
Table 4.2 Unit: mm (inch)
Item
Model
A B C D E
GXH18(5.3)USV4DH
955(37-5/8)
395(15-1/2)
700(27-1/2)
560(22)
360(14-1/8)
GXH24(7.0)USV4DH
980(38
-
5/8)
42
5(16-
3/4)
790(31
-
1/8)
610(24)
395(15
-
1/2)
GXH30(8.8)USV4DH
GXH36(10.6)USV4DH
1105(43-5/8)
440(17-3/8)
1100(43-1/4)
630(24-7/8)
400(15-3/4)
GXH42(12.3)USV4DH
9
60(37-
3/4)
41
0(16-
1/4)
13
50(53-
1/8)
57
0(22-
1/2)
37
5(14-
3/4)
GXH48(14.1)USV4DH

DC Inverter U-match Series Duct Type Unit
12
4.2.2 Condensate Drainage of the Outdoor Unit (for the heat
pump unit only) (Fig. 4.9)
(1). It is required to install a drain pipe for the outdoor unit to drain condensate
water during heating operation (only for the heat pump unit).
(2). All holes, with the exception of the drain pipe hole, should be plugged so as to
avoid water leakage (only for the heat pump unit).
(3). Installation Method: Insert the pipe joint into the Φ25mm (1inch) hole located
at the base plate of the unit and then connect the drain pipe to the pipe joint.
Fig. 4.9
4.3 Installation of the Connection Pipe
4.3.1 Flare Process
(1). Cut the connection pipe with pipe cutter and remove the burrs.
(2). Hold the pipe downward to prevent cuttings from entering the pipe.
(3). Remove the flare nut from the stop valve on the outdoor unit. Get another flare
nut from the accessory bag for the indoor unit. Insert pipe through flare nuts.
Flare the connection with a flaring tool.
(4). Check if the flare part is spread evenly and there are no cracks (see Fig. 4.10).
Fig. 4.10
4.3.2 Bending Pipes
(1). Extend the pipe by hand. Be careful not to crimp it.

DC Inverter U-match Series Duct Type Unit
13
Fig. 4.11
(2). Do not bend the pipes in an angle more than 90°.
(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. 4.12. Bend pipe
as needed and secure insulation with tape.
Fig. 4.12
ķ.
To prevent breaking of the pipe, avoid sharp bends. Bend the pipe with a radius of curvature of
150mm (5-7/8inch) or more.
ĸ. If the pipe is bent repeatedly at the same place, it will break.
4.3.3 Connecting the Pipe at the Indoor Unit Side
Detach the caps and plugs from the pipes.
ķ. Be sure to attach the pipe on the indoor unit correctly.
Center the flare nut on the fitting before
tightening. Do not force the nut to turn or the threads will be damaged and the system will leak.
ĸ.
Do not remove the flare nut until the connection pipe is to be connected so as to prevent dust and
impurities from coming into the pipe system.
Centering the pipe against port on the indoor unit and turn the flare nut with your
hand.
Hold the torque wrench at its grip, keeping it in the right angle with the pipe as shown in
Fig.
4.13,
in order to tighten the flare nut correctly.

DC Inverter U-match Series Duct Type Unit
14
When the flare nut is tightened properly by your hand, use a torque wrench to
finish tightening it.
Fig. 4.13
g
Fig. 4.14
Table 4.3 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. The tightening method is the
same as that as at the indoor side.

Fig. 4.15

DC Inverter U-match Series Duct Type Unit
15
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 Side Only)
Attach coupler heat insulation (large and small) to the pipe connections.
Fig. 4.16
4.3.7 Liquid Pipe and Drain Pipe
(1).
If the outdoor unit is installed lower than the
indoor unit (See Fig. 4.17)
1). A drain pipe should terminate
above ground
level without being submersed
into water.
All pipes must be attached to the wall
with
clamps.
2).
Wrap tape around pipe starting at the
bottom and working up.
3). All pipes must be
bound together by tape
and attached to wall with clamps.

Fig. 4.17

DC Inverter U-match Series Duct Type Unit
16
(2).
If the outdoor unit is installed higher than the
indoor unit (See Fig. 4.18)
1).
Wrap tape from the lower end working up..
2). All pipes must be bound and taped
together.
A trap must be installed to
prevent water
from returning to the room.
3). Attach all pipes to the wall with clamps.

Fig. 4.18
4.4 Vacuum and Gas Leakage Inspection
Do not purge the air with refrigerants but use a vacuum pump to vacuum the installation! There is no
extra refrigerant in the outdoor unit for air purging!
4.4.1 Vacuum
(1). Remove the caps of the liquid valve, gas valve and also the service port.
(2). Connect the hose at the low pressure side of the manifold valve assembly to
the service port of the unit’s gas valve. The gas and liquid valves should be
kept closed in case of refrigerant leak.
(3). Connect the hose used for evacuation to the vacuum pump.
(4). Open the switch at the lower pressure side of the manifold valve assembly
and start the vacuum pump. The switch at the high pressure side of the
manifold valve assembly should be kept closed, otherwise evacuation would
fail.
(5). The evacuation duration depends on the unit’s capacity, generally, 20 minutes
for the 18k units, 30 minutes for the 24k/36k units, 45 minutes for the 48k units.
Verify that the pressure gauge at the low pressure side of the manifold valve
assembly reads -1.0MPa (145psig). If it doesn’t, it indicates there is leak
somewhere. If that is the case, close the switch fully, and stop the vacuum
pump.
(6). Wait for some time to see if the system pressure can remain unchanged, 3
minutes for the 18k/24k units, 10 minutes for the 36k/48k units. During this
time, the reading of the pressure gauge at the low pressure side cannot be
larger than 0.005MPa (0.72psig).

DC Inverter U-match Series Duct Type Unit
17
(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. Note that the
gas and liquid valve can be opened fully only after the manifold valve
assembly is removed.
(8). Replace the caps of the liquid valve, gas valve and service port.
Fig. 4.19
Note: For the large-sized unit, it has the service port for both the gas valve and the liquid valve.
During evacuation, it is possible to connect two hoses of the manifold valve assembly to two
service ports to quicken the evacuating speed.
4.4.2 Additional Charge
Refrigerant suitable for a piping length of 7.6m (25feet) is charged in the outdoor
unit at the factory. When the piping is longer than 7.6m (25feet), additional charging is
necessary.
For the additional amount, see Table 4.4.
Table 4.4
Item
Model
Additional Refrigerant Amount for Extra Pipe
18k
45g per 1.5m (1.6 ounce per 5 feet )
24k~48k
90g per 1.5m (3.2 ounce per 5 feet )

DC Inverter U-match Series Duct Type Unit
18
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. 4.20
4.5 Installation of the Drain Hose
4.5.1 Installation of Drain Piping
Install the drain hose in accordance with the instructions in this installation manual and keep the
area warm enough to prevent condensation. Problems with the piping may lead to water leaks.
(1). Install the drain hose with downward gradient (1/50 to 1/100) and no risers or
traps are used for the hose (Fig. 4.21).
(2). Be sure there is no crack or leak on the drain hose to avoid the formation of air
pocket (Fig. 4.21).
(3). When the hose is long, install supporters (Fig. 4.22).
(4). Always use a drain hose which has been insulated properly.
Fig. 4.21