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

Flex match series
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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..

Flex match series
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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.