Nortek Flex Match Series User manual

Nortek Global HVAC, LLC
Flex Match Series
System-Outdoor Unit
Model:
GXH30(8.8)FMK4DH
GXH36(10.6)FMK4DH
GXH42(12.3)FMK4DH
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.

Preface
The Flex Match System uses cutting-edge manufacturing. Please carefully read this manual before
installation and operation. Please note the following：
(1) This unit measures on the base of UL1995.
(2) Flex Match System conforms to design standard: ARI 210240-2008.
(3) Strictly follow all instructions listed in the manual.
(4) The total capacity of the indoor units which runs at the same time cannot exceed that of the
outdoor units; otherwise, the cooling (heating) effect of each indoor unit would be insufficient.
Model
GXH30(8.8)FMK4DH
GXH36(10.6)FMK4DH
GXH42(12.3)FMK4DH
Minimum number of
connectable indoor
units
2
2
2
Maximum number of
connectable indoor
units
4
5
5
Minimum capacity of
connectable indoor
units
18KBtu
18KBtu
18KBtu
Maximum capacity of
connectable indoor
units
42KBtu
48KBtu
51KBtu
(5) Switch the main power on 8 hours before starting the unit.
(6) It is a normal for the indoor unit fan to continue to run for 20~70 seconds after the indoor unit
receives the “stop” signal so as to make full use of residual heat in the coil.
(7) When the running modes of the indoor and outdoor units conflict, it will be indicated on the
display of the wired controller for five seconds and then the indoor unit will stop. In this case, the units
will resolve the conflict by harmonizing their running modes. The cooling mode is compatible with the
dehumidifying mode. The fan mode can run with any mode. If the supply power fails when the unit is
running, three minutes later after power recovery the indoor unit will send the “start” signal to the
outdoor unit.
(8) Cautions for the Debugging and Maintenance Personnel:
When running debugging or maintenance, make sure the heating belt of the compressor has been
energized for at least eight hours prior to startup! Once the compressor is started, it must run
continuously for at least 30 minutes, otherwise it could be damaged!

User Notice
Children and persons with reduced mental, sensory or physical capabilities should not be allowed
to operate or maintain this equipment.
Children should not play with the appliance.
If the power cord is damaged, it must be replaced by a new cord that meets the same standards as
the original. It must be installed by a qualified professional. Failure to comply could result in damage
to the equipment or cause a fire.
This appliance should be installed by expert or trained users.
DISPOSAL: Do not dispose this product as unsorted household waste. Please
dispose or recycle responsibly.

Contents
1 Safety Precautions...........................................................................................................1
2.1 Parts List .........................................................................................................................................................3
2.2 Combinations of outdoor and indoor units....................................................................................................4
2.3 Rated working condition ................................................................................................................................5
2.4 The range of production working temperature .............................................................................................5
3 Preparation before Installation ........................................................................................6
3.1 Standard parts ................................................................................................................................................6
3.2 Selecting installation site................................................................................................................................6
3.3 Piping Connection...........................................................................................................................................7
4 Installation Instruction.....................................................................................................8
4.1 Outline and dimension of the outdoor unit ...................................................................................................8
4.2 Installation of the Connection Pipe ................................................................................................................9
4.3 Air Purging and Refrigerant Charge............................................................................................................. 12
4.4 Electric Wiring.............................................................................................................................................. 13
5 Troubleshooting.............................................................................................................15
6 Common malfunctions and troubleshooting.................................................................17
7 Troubleshooting.............................................................................................................18
8 Maintenance ..................................................................................................................19
8.1 Outdoor heat exchanger ............................................................................................................................. 19
8.2 Drain Pipe .................................................................................................................................................... 19
8.3 Preseason Checklist ..................................................................................................................................... 19
8.4 Post-Season Checklist.................................................................................................................................. 19
8.5 Parts Replacement....................................................................................................................................... 19
9 After-sales Service.........................................................................................................20

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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 and accompany each unit.
The instruction of installation, maintenance and operating and safety instructions should be kept for future
reference.
2) Installation must be performed in accordance with the requirements of NEC and CEC by authorized personnel
only.
3) Before installation, please check if the power supply is in accordance with the requirements specified on the
nameplate. And also take care of the power safety.
4) Make sure the unit can be grounded properly and securely as to avoid electric shock. Please do not connect the
ground wire to gas pipe, water pipe, lightning rod or telephone line.
5) Be sure to use the approved accessories and parts to prevent the water leakage, electric shock or fire.
6) If refrigerant leakage occurs during installation, please ventilate immediately. Toxic gas will result if the
refrigerant gas meets flame.
7) Wire size of power cord should be sufficiently sized. The damaged power cord and connection wire should be
replaced by approved cable.
8) After connecting the power cord, please secure the electric box cover properly in order to avoid accident.
9) Never fail to comply with the nitrogen charge requirements. Charge with nitrogen when welding pipes.
10) Never short-circuit or cancel the pressure switch to prevent unit damage.
11) Connect the wired controller before turning on power; otherwise wired controller may be damaged.
12) Before using the unit, please check if the piping and wiring are correct to avoid water leakage, refrigerant leakage,
electric shock, or fire.
13) Do not insert fingers or objects into air outlet/inlet grille.
14) (23) If you use gas heater or petroleum heater in the same room, please open the door or window to maintain
good air ventilation.
15) Never start up or shut off the air conditioner by plugging or unplugging the power cord.
16) Do not turn off the unit after it runs for at least five minutes; otherwise the compressor oil return system will be
damaged.
17) Do not allow children operate this unit.
18) Do not operate this unit with wet hands.
19) Turn off the unit or cut off the power supply before cleaning the unit, otherwise electric shock or injury may
occur.
20) Never spray or flush water towards unit, otherwise malfunction or electric shock may occur.
21) Do not expose the unit to the wet or corrosive environment.
22) Turn power on to the unit 8 hours before startup. Do not turn off power if unit will be turned off for a short period
of time such as overnight. If power is turned off, it will need to be turned back on 8 hours before startup again, for
the compressor to warm up..

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23) Volatile liquid, such as paint thinner or gasoline will damage the unit appearance. Only use soft cloth with a little
mild detergent to clean the outer casing of unit.
24) Under cooling mode, please don't set the room temperature too low and keep the temperature difference between
indoor and outdoor unit within 5°C(9°F)
25) If anything abnormal conditions occur (such as burning smell), please power off the unit and cut off the main
power supply. Contact qualified service technician immediately. If unit continues to operate abnormally, it may be
damaged and lead to electric shock or fire.
26) User is not allowed to repair the unit. Faulty service may cause electric shock or fire. Please contact qualified
service center for help.
Manufacturer is not responsible of personal injury or equipment damage caused by improper
installation or commission, unnecessary service and failure to follow the rules and instructions listed in
this manual.

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2 Product Introduction
The Flex Match System uses inverter compressor technology. According to change displacement of compressor,
stepless capacity regulation within a range of 15%~120% can be realized. Multiple product combinations can be
selected with a capacity range from 30KBtu to 42KBtu.
2.1 Parts List
GXH30(8.8)FMK4DH
GXH36(10.6)FMK4DH
GXH42(12.3)FMK4DH
NO.
①
②
③
④
⑤
Name
Motor
Fan
Electric Box
Gas valve assembly
Liquid valve assembly
Fig1
①②
③
④
⑤

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2.2 Combinations of outdoor and indoor units
Fig 2
See Fig.2 for Combinations for Outdoor and Indoor Units. For the free match series air conditioning system, one
outdoor unit is able to drive up to five indoor units which can be cassette type, duct type, wall-mounted or floor
ceiling type. The outdoor unit will run as long as any one indoor unit receives the running command, and all indoor
units stop once the outdoor unit is turned off.
Table 1 Energy Level and Capacity Code of the Indoor
Indoor unit
Model
Capacity Code
Outdoor unit
Wall
mounted
Lomo
GHH09(2.6)LUK4DH
09
GXH30(8.8)FMK4DH;
GXH36(10.6)FMK4DH;
GXH42(12.3)FMK4DH
GHH12(3.5)LUK4DH
12
GHH18(5.3)LUK4DH
18
GHH24(7.0)LUK4DH
24
Flooring ceiling
GFH09(2.6)FMK4DH
09
GFH12(3.5)FMK4DH
12
GFH18(5.3)FMK4DH
18
GFH24(7.0)FMK4DH
24
Duct type
GDH09(2.6)FMK4DH
09
GDH12(3.5)FMK4DH
12
GDH18(5.3)FMK4DH
18
GDH21(6.2)FMK4DH
21
GDH24(7.0)FMK4DH
24
Cassette type
GKH12(3.5)FMK4DH
12
GKH18(5.3)FMK4DH
18
GKH24(7.0)FMK4DH
24
Console
GCH09(2.6)FMK4DH
09
GCH12(3.5)FMK4DH
12
GCH18(5.3)FMK4DH
18

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2.3 Rated working condition
Table 2
Indoor side state
Outdoor side state
Dry bulb temp.℉
Wet bulb temp.℉
Dry bulb temp.℉
Wet bulb temp.℉
Rating cooling
80.06
66.92
95
75.02
Rating Heating
69.98
60.08
47
43.00
NOTICE
1) The following listed cooling /heating capacity and sound is tested before shipment.
2) The parameters below are tested under rated working condition. If there is any change to them, please refer to the
nameplate.
3) The parameters of heating capacity of indoor unit for heat pump excluded any auxiliary electric heating power.
4) The performance parameters below are tested according to standardANSI/AHRI 1230-2010.
2.4 The range of production working temperature
Table 3
Cooling Working range
Outdoor temperature 0~118℉
Heating Working range
Outdoor temperature -4~86℉

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3 Preparation before Installation
3.1 Standard parts
Please use the following standard parts supplied by GREE.
Table 4
Pars of Outdoor Unit
Number
name
picture
Quantity
Remark
1
Owner's manual
1
2
Tube connector
subassy
8
3.2 Selecting installation site
1) (1) 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.
2) Never expose the unit to direct sunlight or rainfall. The unit should be protected from dust, strong wind
and earthquake..
3) Try to keep the unit away from combustible, inflammable, corrosive or exhaust gas.
4) Leave clearance space around unit for service and maintenance.
5) Keep the indoor and outdoor units as close as possible to each other to reduce pipe length and bends.
6) Never allow children to play on or near the unit.
When the outdoor unit is surrounded by walls, leave appropriate clearances as shown in Fig. 3.

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Fig 3
3.3 Piping Connection
The maximum pipe length is shown in the following table. When the distance between units (piping length) is
out of the range listed below, normal run of the unit cannot be guaranteed.
Table 5
Model
Connecting Pipe (inch)
Max. Pipe length(ft)
Max. Height Difference between Indoor
Unit and Outdoor Unit (ft)
Liquid
Gas
GXH30(8.8)FMK4DH
Ф1/4
Φ3/8
225
When the outdoor unit is above,
maximum height difference between
indoor and outdoor units is up to 50ft;
When the indoor unit is above,
maximum height difference between
indoor and outdoor units is up to 50ft;
GXH36(10.6)FMK4DH
Ф1/4
Ф3/8
250
GXH42(12.3)FMK4DH
Ф1/4
Ф3/8
250
NOTICE
1) Use water-proof insulating pipe.
2) Wall thickness of pipe: 0.019-0.039 inch; bearing pressure: 3.0MPa
3) The longer the connection pipe is, the lower the cooling and heating capacity.
＞19 2/3
＞393/8
＞783/4 ＞19 2/3
＞19 2/3 ＞19 2/3
＞783/4
unit:inch

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4 Installation Instruction
4.1 Outline and dimension of the outdoor unit
GXH30(8.8)FMK4DH
Outline dimension and Mounting holes

Flex match series
9
GXH36(10.6)FMK4DH & GXH42(12.3)FMK4DH
Outline dimension and Mounting holes
4.2 Installation of the Connection Pipe
Connecting piping for indoor unit and outdoor unit are in manifold mode. (As shown below).
Fig 6
4.2.1 Piping between the Indoor and Outdoor Units
(1) If the liquid and gas stop valves listed as A , B, C, D or E have not been connected to the indoor units, please
remove the caps with wrench.
(2) Refer to Fig. 7 for the torque requirements.
(3) Align the flare end of the copper pipe point with the screw and then tighten the screw by hand.
(4) After that, tighten the screw with the torque wrench unit it clicks (as shown in Fig. 7).
(5) Use a pipe tube bender to bend the pipe. If the degree of the pipe bend is too small, it will break.
(6) Wrap the exposed refrigerant pipe and the joints with sponge and then secure them with the plastic tape.

Flex match series
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Fig 7
1) When installing pipe lines to units, never forcefully pull on pipes or connections could be damaged and
result in a refrigerant leak.
2) The refrigerant pipe should be supported by brackets. The units should not bear the weight of the
pipes.
3) If the piping connection size of outdoor unit does not match the piping connection size of indoor unit,
use the piping connection dimension of indoor unit. Use an adapter joint to connect the pipes.
4) For the Flex Match system, each pipe should be labeled to make connections easier and more accurate.
4.2.2 Allowable pipe length and drop height between indoor and outdoor units
If the total refrigerant pipe length (liquid pipe) is smaller than that listed in the table below, no additional
refrigerant will be needed. Table 6
Model
GXH30(8.8)FMK4DH
GXH36(10.6)FMK4DH
GXH42(12.3)FMK4DH
Total Liquid Pipe
Lenght (a+b+c+d+e)
130ft
130ft
130ft
Pipe Flare Nut
Spanner
Pipe
diameter
Thickness of
copper tube
Tightening
torque [NOTE:
Convert back to
N/M]
Φ1/4 inch
≥0.0315 inch
11～22 ft·lbf
Φ3/8 inch
≥0.0315 inch
26～29 ft·lbf
Φ1/2 inch
≥0.0315 inch
33～37 ft·lbf
Φ5/8 inch
≥0.0394 inch
44～48 ft·lbf

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Allowable Length and Height Fall of the Refrigerant Pipe
Table 7
Allowable Value
Fitting Pipe
GXH30(8.8)FMK4DH
GXH36(10.6)FMK4DH,
GXH42(12.3)FMK4DH
Total length (actual length) of fitting
pipe
225ft
250ft
L1+L2+…+LM(M ≤5)
Length of farthest fitting pipe (ft)
82ft
82ft
LX（X=1，2，3，4,5）
Height difference
between outdoor
unit and indoor unit
Outdoor unit
at upper
50ft
50ft
H1
Outdoor unit
at lower
50ft
50ft
H3
Height difference between indoor
units (m)
25ft
25ft
H2
Fig 8
4.2.3 Installation of the Protection Layer for Refrigerant Pipe
(1)The refrigerant pipe should be insulated with the insulating material and plastic tape in order to prevent
condensation.
b
a
e
d
c
L4L3L2 L5L1
Outdoor unit
Height difference between indoor unit and outdoor unit H1
Height difference between
indoor units H2
Indoor unit
Indoor unit
Equivalent length of the farthest fitting pipe Lx

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(2)The joints of the indoor unit should be wrapped with the insulating material with no gap allowed on the joint
of the indoor unit, as shown in Fig. 9.
Fig. 9
After the pipe is protected, never bend it to form a small angle, or it could break.
(3)Wrap the Pipe with Tape：
a. Bundle the refrigerant pipe and electric wire together with tape, and separate them from the drain pipe to
prevent the condensate water overflowing.
b. Wrap the pipe from the bottom of the outdoor unit to the top of the pipe where it enters the wall. Each layer of
tape should overlap the previous layer by ½ the width of the tape.
c. Attach the wrapped pipe on the wall with clamps.
1) Do not wrap the pipe too tightly; otherwise the insulation effect would be weakened.Additionally, make sure the
drain hose is separated from the pipe.
2) Seal the hole on the wall to keep out wind and rain.
4.2.4 Support and protection for pipeline
Support should be made for hanging connection pipe. Distance between each support cannot be over 1m (3 ft).
4.3 Air Purging and Refrigerant Charge
4.3.1 Air purging
(1) The refrigerant has been charged into the outdoor unit before shipment. Additional refrigerant may need to be
charged into the refrigerant pipe during the field installation.
(2) Check if the liquid valve and the gas valve of the outdoor unit are fully closed.
Thermal insulating layer is required to be wrapped at this part.
Thermal insulating pipe
No gap

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(3) As shown in the following figure (Fig. 10), remove the refrigerant inside the indoor unit and refrigerant pipe
out with the vacuum pump.
Fig 10
(4) When the compressor is not running, charge the R410A refrigerant into the refrigerant pipe from the liquid
valve of the outdoor unit (not from the gas valve).
4.3.2 Additional refrigerant charging
The GXH30, 36 and 42 models are factory charged for a minimum of 130 feet. Should you need to exceed 130
feet, then using 0.2 ounces per foot, calculate your additional refrigerant charge. The maximum lineset length of run
cannot exceed 225 feet for a GXH30 model. GXH 36 and 42 models have a maximum length of lineset run of 250 feet.
The total amount of additional refrigerant charge cannot exceed 28 total ounces.
4.4 Electric Wiring
4.4.1 Wiring precautions
(1) The installation must be done in accordance with national wiring regulations.
(2) Only a power cord with the rated voltage and dedicated circuit for the air conditioning can be used.
(3) Do not pull on unit by power cord.
(4) The electric installation should follow local laws, regulations and this manual.
(5) The diameter of the power cord should be sufficiently sized. If damaged, it should be replaced by appropriate
cord.
(6) The gounding should be secure and the ground wire should be connected by qualified technician. Besides, the
circuit breaker must be provided with enough capacity and of both magnetic and thermal tripping functions for short
circuit and overload. Table 8
Models
Power Supply
Circuit Breaker（A）
Recommended Wire Size AWG
GXH30(8.8)FMK4DH
208/230V~60Hz
32
14
GXH36(10.6)FMK4DH
208/230V~60Hz
32
14
GXH42(12.3)FMK4DH
208/230V~60Hz
32
14
"LO"Knob "HI"Knob
Vacuuming pump
ManometerManometer
Connection hose
liquid valve
Gas valve

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GXH30(8.8)FMK4DH
Fig 11
GXH36(10.6)FMK4DH、GXH42(12.3)FMK4DH
Fig 12
4.4.2 Grounding Requirements
(1) The air conditioner is classified as a Class I appliance, so grounding must be reliable.
(2) The yellow-green line of the air conditioner is the ground line and cannot be used for other purpose, cut off or
fixed by the tapping screw; otherwise it would cause electric shock.
(3) A reliable ground terminal should be provided and the ground wire cannot be connected to any of the
following.
①Water pipe;；②Coal gas pipe; ③Sewage pipe; ④Other unreliable objects.
4.4.3 Electrical Cable Connection
1) Faulty connection will result in malfunction.After connection, the wire should not be taut.
2) Piping and wiring connection should be connected as described in this manual.
3) The electric installation should be carried out by the technician as instructed by the local laws, regulations and
this manual.
4) The installation location should be dry, without exposure to direct sunlight or strong wind.
5) A circuit breaker must be installed shut off the main power supply of the entire system..
INDOOR UNIT D
INDOOR UNIT C
INDOOR UNIT B
INDOOR UNIT A
XT3
N(1
)N
(1
)
X T4
N
(1)
XT2
X
T1
2
3
PE
X
T
N(
1)
OUTDOOR UNIT
PO
WER
L 1L
2
L 2
L 1
2
32
32
3
N(1)23N(
1
)
2
3N
( 1)
2
3
N(1
)2
3
PE
P
E
P
EP
E
INDOOR UNIT D
INDOOR UNIT C
INDOOR UNIT B
INDOOR UNIT A
XT3
N(1)N(1)
XT4
N( 1)
X
T2
X T1
2
3
PE
XT
N(1)
OUTDOOR UNIT
POW
ER
L
1L
2
L 2
L
1
2
3
2
3
23
N(1)
2
3N(1)
23
N (1)
2
3N(1
)
23
PE
PE
P
EPE
XT5
N(1)23
INDOOR UNIT E
N
(1)2
3
PE

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4.4.4 Wiring of the Power Cord
(1). Open the side plate.
(2). Connect the power cord to the terminals “L1”, “L2”and to the grounding bolt, and then connect the wiring
terminals “N(1),2,3”of the indoor unit to those of the outdoor unit accordingly. Use the green bonding screw to
connect the grounding cord. The location is showing in the Fig. 13.
(3). Secure the power cord with wire clips.
(4). Lead the power cord through the rubber ring.
If the supply cord is damaged, it must be replaced by qualified
person in order to avoid a hazard.
Fig 13

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5 Troubleshooting
1) In the event of abnormal conditions (like, strong or burning smell), shut off the main power supply immediately
and then contact qualified service personnel. Continual us of malfunctioning unit will damage the air conditioning
unit and also would cause electric shock or fire hazard.
2) User should not repair the air conditioner. Contact professionally skilled personnel as faulty repair would cause
electric shock or fire hazard.
Check before Contacting Service Center. Table 9
Check Items
Conditions Might Happen
Check
Has the unit been securely mounted?
The unit may fall, shake or emit noise.
Have you done the gas leakage test?
It may cause poor cooling/heating
performance.
Did the unit get proper thermal
insulation?
It may cause condensation and dripping.
Does the condensate drain well?
It may cause dripping.
Does the voltage match the rated voltage
specified on the nameplate?
It may cause malfunction or damage.
Is the electric wiring and piping
connection installed correctly and
securely?
It may cause malfunction or damage.
Has the unit been grounded securely?
It may cause electrical shock.
Is the power cord properly installed?
It may cause malfunction or damage.
Are the inlet or outlet blocked?
It may cause poor cooling/heating
performance.
NOTICE!
If the air conditioner still runs abnormally after the above check and handling, please contact the
maintenance serviceman at the local appointed service center and also give a description of the error occurred as
well as the model number.