Midea FQZHW-02N1E, FQZHW-03N1E, FQZHN-01D, FQZHN-02D, FQZHN-03D Installation Manual

INSTALLATION MANUAL

All DC Inverter V6 Series VRF Outdoor Unit

Before using it, please read this manual carefully and keep it for future reference.

Thank you very much for purchasing our air conditioner.

Contents

1. Overview ....................................................................................... 1

2. About the Packing Box .................................................................. 2

3. About the Outdoor Unit Combination ............................................. 3

4. Preparations Before Installation ...................................................... 5

5. Outdoor Unit Installation..................................................................11

6. Configuration ................................................................................. 21

7. Commissioning .............................................................................. 25

8. Maintenance and Repair ............................................................... 26

9. Error codes ....................................................................................27

10. Disposal ..........................................................................................27

11. Technical Data ..............................................................................28

Overview

1

Meaning of Various Labels

1.1

The precautions and things to note in this document involve very important

▪

information. Please read them carefully.
All the activities described in the installation manual must be performed by

▪

an authorized installation personnel.

Warning

A situation that may lead to severe injury or death.

Caution

Note

▪

The figure shown in this manual is for reference only and
may be slightly different from the actual product.

▪

Improper installation or connection of equipment and accessories
may cause electric shocks, short circuits, leaks, fires, or other
damage to the equipment. Use only accessories, equipment and
spare parts made or approved by manufacturer.

▪

Take appropriate measures to prevent small animals from entering
the unit. Contact between small animals and electrical components
may cause system malfunction, leading to smoke or fire.

▪

Do not place any object or equipment on top of the unit.

▪

Do not sit, climb, or stand on the unit.

▪

Operation of this equipment in a residential environment could
cause radio interferece.

Installation site

1.2.2

▪

Provide sufficient space around the unit for maintenance and air
circulation.

▪

Make sure the installation site can bear the weight of the unit and
vibrations.

▪

Make sure the area is well ventilated.

▪

Make sure the unit is stable and level.

Do not install the unit in the following locations:

An environment where there is a potential risk of explosions.

▪
▪

Where there are equipment emitting electromagnetic waves. Electromagnetic
waves may disrupt the control system, and cause the unit to malfunction.
Where there are existing fire hazards like leakage of flammable gases,

▪

carbon fibres, and combustible dust (such as diluents or gasoline).
Where corrosive gases (such as sulphurous gases) are produced.

▪

Corrosion of copper pipes or welded parts may lead to refrigerant leakage.

Refrigerant

1.2.3

A situation that may lead to mild or moderate injury.

Note

A situation that may cause damage to the equipment or loss of property.

Information

i

Indicates a useful hint or additional information.

What the Installation Operator Must Know

1.2

Overview

1.2.1

If you are uncertain on how to install or run the unit, please contact the agent.

Warning

Make sure the installation, testing and materials used comply with the

▪

applicable law.

▪

Plastic bags should be disposed of properly. Avoid contact by children.
Potential risk: Asphyxia.

▪

Do not touch the refrigerant piping, water piping or internal parts during
operations, and when the operation has just been completed. This is
because the temperature may be too high or too low. Let them recover to
the normal temperature first. Wear protective gloves if you must come in
contact with these.

▪

Do not touch any refrigerant that has accidentally leaked.

Caution

▪

Please wear the appropriate personal protective tools during installation,
maintenance or repair of the system (protective gloves, safety glasses,
etc.).

▪

Do not touch the air inlet or aluminium fin of the unit.

Warning

During the test, do not exert a force greater than the maximum allowed

▪

pressure on the product (as shown on the nameplate).

▪

Take appropriate precautions to prevent refrigerant leakage. If the
refrigerant gas leaks, ventilate the area immediately. Possible risk: An
excessively high concentration of refrigerant in an enclosed area can
lead to anoxia (oxygen deficiency). The refrigerant gas may produce a
toxic gas if it comes in contact with fire.

▪

Refrigerant must be recovered. Do not release it to the environment.
Use the vacuum pump to draw the refrigerant out from the unit.

Note

Make sure the refrigerant piping is installed in accordance with the

▪

applicable law. In Europe, EN378 is the applicable standard.
Make sure the piping and connections are not placed under pressure.

▪
▪

After all the piping connections have been completed, check to make
sure there is no gas leak. Use nitrogen to conduct the leak check for gas.
Do not charge refrigerant before the wiring layout is completed.

▪

Only charge the refrigerant after the leak tests and vacuum drying

▪

have been completed.
When charging the system with refrigerant, do not exceed the

▪

allowable charge to prevent liquid strike.

Do not charge more than the specified amount of refrigerant. This is to

▪

prevent the compressor from malfunctioning.
The refrigerant type is clearly marked on the nameplate.

▪

The unit is charged with refrigerant when it is shipped from the factory. But

▪

depending on the piping dimensions and length, the system require
additional refrigerant.

Only use tools specific to the type of system refrigerant to make sure the

▪

system can withstand the pressure, and prevent foreign objects from
entering the system.
Follow the steps below to charge the liquid refrigerant:

▪

Open the refrigerating cylinder slowly.
Charge the liquid refrigerant. Charging with gas refrigerant may hamper
normal operations.

1

Caution

Once refrigerant charging is completed or suspended, close the refrigerant
tank valve immediately. The refrigerant may volatilize if the refrigerant tank
valve is not closed in time.

Electricity

1.2.4

Warning

▪ Make sure you switch off the power of the unit before you open the electric

control box, and access any circuit wiring or components inside. At the
same time, this prevents the unit from being accidentally powered up during
installation or maintenance work.

▪ Once you open the cover of the electric control box, do not let any liquid

spill into the box, and do not touch the components in the box with wet
hands.

▪ Cut off power suppy more then 5 minutes prior to access the electrical

parts. Measure the voltage of the main circuit capacitor or electrical
component terminals to make sure the voltage is less than 36 V before you
touch any circuit component. Refer to the connections and wiring on the
nameplate for the master circuit terminals and connections.

▪ The installation must be completed by professionals, and must comply with

local laws and regulations.

▪ Make sure the unit is grounded, and the grounding must conform to the

local law.

▪ Use only copper core wires for installation.
▪ Wiring must be carried out in accordance with what is stated in the

nameplate.

▪ The unit does not include a safety switch device. Make sure a safety switch

device that can completely disconnect all polarities is included in the
installation, and that the safety device can be completely disconnected
when there is excessive voltage (such as during a lightning strike).

▪ Make sure the wiring ends are not subjected to any external force. Do not

pull or squeeze the cables and wires. At the same time, make sure the
wiring ends are not in contact with the piping or sharp edges of the sheet
metal.

▪ Do not connect the earth wire to public pipes, telephone earth wires, surge

absorbers and other places that are not designed for grounding. A gentle
reminder that improper grounding may cause electric shock.

▪ Use a dedicated power supply cord for the unit. Do not share the same

power source with other equipment.

▪ A fuse or circuit breaker must be installed, and these must conform to the

local law.

▪ Make sure an electric leakage protection device is installed to prevent

electric shocks or fire. The model specifications and characteristics (anti
high-frequency noise characteristics) of the electric leakage protection
device are compatible with the unit to prevent frequent tripping.

▪ Make sure all terminals of the components are firmly connected before you

close the cover of the electric control box. Before you power on and start
the unit, check that the cover of the electric control box is tight and secured
properly with screws. Once the box is covered, do not let any liquid spill into
the electric control box, and do not touch the components in the box with
wet hands.

▪ Make sure a lightning rod is installed if the unit is placed on the roof or other

places that can be easily struck by lightning.

▪ The appliance shall be installed in accordance with national wiring

regulations.

▪ If the supply cord is damaged, it must be replaced by the manufacturer or

its service agent or a similarly qualified person in order to avoid a hazard

▪ An all-pole disconnection switch having a contact separation of at least

3mm in all poles should be connected in fixed wiring

▪ The dimensions of the space necessary for correct installation of the

appliance including the minimum permissible distances to adjacent
structures

▪ The temperature of refrigerant circuit will be high, please keep the

interconnection cable away from the copper tube

Note

▪ Do not install the power cord near equipment that is susceptible to

electromagnetic interference, such as TV, and radios to prevent
interference.

▪ Use a dedicated power supply cord for the unit. Do not share the same

power source with other equipment. A fuse or circuit breaker must be
installed, and these must conform to the local law.

Information

i

The installation manual is only a general guide on the wiring and connections,
and is not specifically designed to contain all information regarding this unit.

Important Information for User

1.3

▪

If you are uncertain on how to run the unit, please contact the installation
personnel.

▪

This unit is not suitable for people who lack physical strength, cognitive sense
or mental ability, or who lack experience and knowledge (including children).
For their own safety, they should not use this unit unless they are supervised
or guided by the respective personnel in charge of their safety. Children must
be monitored to ensure that they do not play with this product.

Warning

To prevent electric shock or fire:
Do not wash the electric bo of the unit.

▪

Do not operate the unit with wet hands.

▪
▪

Do not place any items that contain water on the unit.

Note

▪

Do not place any object or equipment on top of the unit.
Do not sit, climb, or stand on the unit.

▪

About the Packing Box

2

Overview

2.1

This chapter mainly introduces the subsequent operations after the outdoor unit
has been delivered to site and unpacked.
This specifically includes the following information:

Unbox and handling the outdoor unit.

▪
▪

Take out the accessories of the outdoor unit.

▪

Dismantle the transport rack.

Remember the following:

▪

At the time of delivery, check the unit for any damage. Report any damage
immediately to the carrier's claim agent.

▪

As far as possible, transport the packaged unit to its final installation site to
prevent damage during the handling process.
Take note of the following items when transporting the unit:

▪

Fragile. Handle with care.

Keep the unit with its front facing upwards so as not to damage the
compressor.

▪

Select the unit transportation path in advance.

2

▪

As shown in the following figure, it is better to use a crane and two long belts to lift
the unit. Handle the unit carefully to protect it, and note the position of the centre
of gravity of the unit.

Hook

Need protect plates

Belt

Note

Use a leather belt that can adequately support the weight of the unit, and

▪

has a width ≤ 20 mm.

Images are for reference only. Please refer to the actual product.

▪

Unbox the Outdoor Unit

2.2

Take the unit out from the packing materials:

▪

Be careful not to damage the unit when you use a cutting tool to remove the
wrapping film.

▪

Remove the four nuts on the wooden back stand.

Warning

Pipe Fittings

2.4

The schematic after the L-shaped pipe (from accessories) is properly

▪

connected to the unit is shown below:

Check port (used
to measure system
pressure, charge
refrigerant and
vacuumize)

62

Unit: mm

22.2

31.8 38.1

22.2

77

SIZE

SIZE

ΦA

Φ B

ΦB

HP

HP

A

63

8-22HP

12.7

25.4

Check port (used to measure
system pressure, charge
refrigerant and vacuumize)

Liquid pipe
connection

port (ΦA)

Gas pipe
connection

port (ΦB)

50

14-168-10 18-24 30-3212 26-28

15.9

28.6

15.9

31.8

55

63

24-32HP

19.1

31.8

2.5 Remove the Protect board

Protecting boards are placed around the condenser , please remove the
protecting boards when installing the unit; otherwise the capacity of the
outdoor unit will be affected.

Liquid pipe
connection

port (ΦA)

Gas pipe
connection

port (ΦB)

Plastic film should be disposed of properly. Avoid contact by children.
Potential risk: Asphyxia.

2.3

Taking Out Accessories of Outdoor Unit

The accessories for the unit are stored in two parts. Documents like the manual

▪

are located at the top of the unit. Accessories like the pipes are located inside
the unit, on top of the compressor. The accessories in the unit are as follows:

Name

Outdoor unit
installation manual

Outdoor unit
operation manual

Erp information

Screw pack

90° socket elbow

Sealing cover

L-shaped pipe
connection

Build-out resistor

Wrench

Qty Function

Outline

1

1

1

1

1

8

2

2

1

Reserved for
maintenance

To connect piping

To clean pipes

To connect gas and
liquid pipes

To improve
communication stability

To remove the side
plate screws

condenser

protect board

About the Outdoor Unit Combination

3

Overview

3.1

This chapter contains the following information:

▪

List of branch joint fittings.

▪

Recommended combination for outdoor unit.

Branch joints

3.2

Description

Outdoor Unit Branch

Joint Assembly

Indoor Unit Branch

Joint Assembly

On the choice of branch joints, refer to section 4.3.3 on the selection of branch
joints for refrigerant piping.

Model Name

FQZHW-02N1E

FQZHW-03N1E

FQZHN-01D

FQZHN-02D

FQZHN-03D

FQZHN-04D

FQZHN-05D

FQZHN-06D

FQZHN-07D

3

Recommended Outdoor Unit Combination3.3

HP

HP

8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
56
58
60
62
64
66
68
70
72
74
76
78
80
82
84
86
88
90
92
94
96

8 10 12 14 16

●

●

●

●

●

●

●

●

●

●

18 20 22 24 26 28 30 32

●

●

●

●

●

●

●

●

●

●

●

●

●

●

●

●●

●

●

●

●

●

●

●

●

●

●●

●

●

●

●

●

● ●

●

●

●

●

●

●

●

●

●●

●

●

●

●

●

Max Qty. of
indoor units

13
16

20
23
26
29
33
36
39
43
46

●

●

50
53
56
59
63
64
64
64
64
64
64
64
64

●●

●

●

●

●

●●

●

●

●

●

●

●

●

●

●

●

●

●●

●●

●

●●

●

●●

64
64
64
64
64
64
64
64
64
64
64
64
64
64
64
64
64
64
64
64

●●●

64

Caution

In the system where all indoor units are running at the same time, the total capacity of the indoor units should be less than or equal to the

▪

combined capacity of the outdoor unit to prevent overloading in bad working conditions or narrow operating space.

The total capacity of the indoor units can be up to a maximum of 130% of the combined capacity of the outdoor unit for a system where not all

▪

the indoor units are operating at the same time.

If the system is applied in a cold region (ambient temperature is -10°C and below) or a very hot, heavy loading environment, the total capacity

▪

of the indoor units should be less than the combined capacity of the outdoor unit.

4

Preparations Before Installation

4

Overview

4.1

This chapter mainly describes the precautions and things to note before the unit is

installed at the site.

This mainly includes the following information:

Choose and Prepare the Installation Site

▪

Select and Prepare the Refrigerant Piping

▪
▪

Select and Prepare the Electrical Wiring

Choose and Prepare the Installation Site

4.2

Site requirements for installation of outdoor unit

4.2.1

Provide sufficient space around the unit for maintenance and air circulation.

▪
▪

Make sure the installation site can bear the weight of the unit and vibrations.

Make sure the area is well ventilated.

▪
▪

Make sure the unit is stable and level.

Choose a place where the rain can be avoided as much as possible.

▪

The unit should be installed in a location where the noise generated by the unit

▪

will not cause any inconveniences to any person.

Choose a site that will comply with the applicable law.

▪

Do not install the unit in the following locations:

▪

An environment where there is a potential risk of explosions.

Where there are equipment emitting electromagnetic waves. Electromagnetic

▪

waves may disrupt the control system, and cause the unit to malfunction.

▪

Where there are existing fire hazards like leakage of flammable gases, carbon

fibres, and combustible dust (such as diluents or gasoline).

▪

Where corrosive gases (such as sulphurous gases) are produced. Corrosion of

copper pipes or welded parts may lead to refrigerant leakage.

Where mineral oil mist, spray, or steam may exist in the atmosphere. Plastic

▪

parts may age, fall off or cause water leakage.

Where there is a high salt content in the air such as places near the sea.

▪

Do take into considerations adverse environmental conditions such as

▪

strong winds, typhoons or earthquakes as an improper installation may

cause the unit to overturn.

▪

Take precautions to make sure the water will not damage the installation

space and environment in the event of a water leakage.

If the unit is installed in a small room, refer to section 4.2.3 “Safety

▪

measures to prevent refrigerant leak” to make sure the refrigerant

concentration does not exceed the permissible safety limit when there is

a refrigerant leak.

Make sure the air inlet of the unit is not directed at the main wind

▪

direction. Incoming wind will disrupt the operations of the unit. If

necessary, use a deflector as an air baffle.

▪

Add water discharge piping on the base so that the condensed water will

not damage the unit, and prevent the accumulation of water to form pits

when the works are in progress.

Site requirements for installation of outdoor unit in cold regions

4.2.2

Note

Snow protection facilities must be installed in areas with snowfall.

Refer to the following figure, (malfunctions are more common when

there is insufficient snow protection facilities). In order to protect the

unit from accumulated snow, increase the height of the rack, and

install a snow shield at the air inlets and outlets.

Snow shield for air inlet

Snow shield for air outlet

Caution

▪

Electric appliances that should not be used by the general public must be

installed in the safety area to prevent others from getting close to these

electric appliances.

▪

Both indoor and outdoor units are suitable for the installation of

commercial and light industrial environment.

An excessively high concentration of refrigerant in an enclosed area can

▪

lead to anoxia (oxygen deficiency).

Note

▪

This is a class A product. This product may cause radio interference in

the home environment. The user may need to take the necessary

measures if such a situation does arise.

▪

The unit described in this manual may cause electronic noise generated

by radio frequency energy. The unit conforms to the design specifications

and provides reasonable protection to prevent such interference.

However, there is no guarantee that there will be no interference during

a specific installation process.

▪

Therefore, it is suggested that you install the units and wires at an

appropriate distance from devices like sound equipment and personal

computers.

Snow shield for air inlet

Figure 4.1

Note

Do not obstruct the air flow of the unit when you install the
snow shield.

Safety measures to prevent refrigerant leak

4.2.3

Safety measures to prevent refrigerant leak

The installation personnel must make sure the safety measures to prevent
leaks comply with local regulations or standards. If the local regulations do not
apply, the following criteria can be applied.
The system uses R410A as the refrigerant. R410A itself is a completely
non-toxic, and non-combustible refrigerant. However, do ensure that the air
conditioning unit is installed in a room with sufficient space. This is so that when
there is a serious leak in the system, the maximum concentration of the
refrigerant gas in the room will not exceed the stipulated concentration, and is
consistent with the relevant local regulations and standards.

About the maximum concentration level

The calculation for the maximum concentration of the refrigerant is directly
related to the occupied space that the refrigerant may leak to and the charging
amount of the refrigerant.
The measurement unit for concentration is kg/m
that has a volume of 1 m
The highest level of permissible concentration must comply with the relevant
local regulations and standards.
Based on the applicable European standards, the maximum permissible
concentration level of R410A in the space occupied by humans is limited to

0.44 kg/m

3

.

3

in the occupied space).

3

(weight of gaseous refrigerant

5

Select and Prepare the Refrigerant Piping

4.3

Refrigerant piping requirements

4.3.1

Note

The R410A refrigerant pipeline system must be kept strictly clean, dry and

sealed.

Cleaning and drying: prevent foreign objects (including mineral oil or

▪

water) from mixing into the system.

Seal: R410A does not contain fluorine, does not destroy the ozone layer,

▪

and does not deplete the ozone layer that protect the earth from harmful

ultraviolet radiation. But if it is released, R410A can also cause a slight

greenhouse effect. Therefore, you must pay special attention when you

check the sealing quality of the installation.

The piping and other pressure vessels must comply with the applicable

▪

laws and suitable for use with the refrigerant. Use only phosphoric acid

deoxidized seamless copper for the refrigerant piping.

▪

Foreign objects in the pipes (including lubricant used during pipe bending) must

be ≤ 30 mg/10m.

▪

Calculate all piping lengths and distances.

Table 4.1

Total piping length

Allowable length and height difference for refrigerant piping

4.3.2

Refer to the following table and figure (for reference only) to determine the
appropriate size.

Note

▪

The equivalent length of each branch joint is 0.5m.

As much as possible, install the indoor units such that they are

▪

equidistant on both sides of the U-shape branch joint.

When the outdoor unit is above the indoor unit, and the level

▪

difference exceeds 20 m, it is recommended that an oil return bend be

set up at every 10 m interval on the gas pipe of the main piping. The

recommended specifications of the oil return bend are as shown in

figure 4.3.

When the outdoor unit is below the indoor unit, and H ≥ 40 m, you need

▪

to increase the size of the liquid pipe in the main piping by one size.

The allowable length of the farthest indoor unit to the first branch joint

▪

in the system should be equal to or less than 40m unless specified

conditions are met, in which case the permitted length is up to 90m.

Please refer to requirement 2.

Special-purpose branch joints from manufacturer for all branch joints

▪

should be used. Failing to do so may lead to severe system

malfunction.

Permitted

values

≤ 1000m

L

+ 2 x Ʃ{L2 to L16} + Ʃ{a to q}

1

Piping

Piping between farthest indoor
unit and first outdoor branch
joint

Piping between farthest indoor unit and first indoor

Piping lengths

branch joint
Piping between outdoor unit and
outdoor branch joint

Largest level difference
between indoor unit and
outdoor unit

Level

differences

Largest level difference between indoor units

W3

(12)

g1

Largest level difference betwee indoor

W2

(22)

g2

unit and outdoor unit ≤ 90m

W1

(32)

g3

S

R

G1

A

L1

L9

Actual length

Equivalent length

Actual length

Outdoor unit is
above

Outdoor unit is
below

L2

L10

I

L14

Piping between farthest indoor unit and first indoor

branch joint ≤ 40m

Equivalent length of piping between farthest indoor

unit and first outdoor branch joint ≤ 200m

≤ 175m

≤ 200m

≤ 40m / 90m

≤10

L

+ Ʃ{L9 to L13} + k

1

(Refer to Requirement 1)

Ʃ{L9 to L13} + k

(Refer to Requirement 2)

g1+G1≤10m; g2+G1≤10m
g3≤10m

≤ 90m

(Refer to Requirement 3)

≤ 110m

≤ 30m

a

(140)

L4

C

L3

B

L6

L7

G

e

F

N9

L15

L11

(112)

N15

(140)

j

L12

K

L16

O

o

i

J

N

n

(Refer to Requirement 4)

N

N1

D

(140)

b

L5

E

L8

f

N5

(112)

N10

(140)

L

N6

(140)

L13

m

P

N16

(56)

2

N3(71)

c

d

g

H

h

N4(140)

N7(28)

N8(140)

11

N

(71)

k

M

l

p

N12

(28)

N13

(140)

ILargest level difference between

indoor units ≤ 30m

N14

(56)

q

N17

(140)

Figure 4.2

6

4.3.3

Piping diameter

Table 4.2

≥300mm

≥300mm

Figure 4.3

The piping length and level difference requirements that apply are

summarized in Table 4.1 and are fully described as follows.

1. Requirement 1: The piping between the farthest indoor unit (N11) and

the first outdoor branch joint (R) should not exceed 175m (actual

length) and 200m (equivalent length). (The equivalent length of each

branch joint is 0.5m.)

2. Requirement 2: The piping between the farthest indoor unit (N11) and

first indoor branch joint (A) should not exceed 40m in length (Ʃ{L9 to
L13} + k ≤ 40m) unless the following conditions are met and the follow-

ing measures are taken, in which case the permitted length is up to

90m.

Conditions:

a) Each indoor auxiliary pipe (from each indoor unit to its nearest branch

joint) joint does not exceed 20 m in length (a to m each ≤ 20m).

b) The difference in length between {the piping from first indoor branch

joint (A) to the farthest indoor unit (N11)} and {the piping from the first

indoor branch joint (A) to the nearest indoor unit (N1)} does not exceed

40m. That is: (Ʃ{L9 to L13} + k) - (Ʃ{L2 to L3} + a) ≤ 40m.

Measures:

a) Increase the diameter of the indoor main pipes (the piping between the

first indoor branch joint and all other indoor branch joints, L2 to L16) as

follows, except for indoor main pipes which are already the same size

as the main pipe (L1), for which no diameter increases are required.

φ9.5→φ12.7 φ12.7→φ15.9 φ15.9→φ19.1
φ19.1→φ22.2 φ22.2→φ25.4 φ25.4→φ28.6
φ28.6→φ31.8 φ31.8→φ38.1 φ38.1→φ41.3
φ41.3→φ44.5 φ44.5→φ54.0

Piping Name

Main piping

indoor main piping

piping of indoor unit

Indoor Unit Branch Joint Assembly

Outdoor Unit Branch Joint Assembly

Connection piping of outdoor unit

Model

L1

2, L3, L4, L5,... L16

L

a, b, c, d,... q

A, B, C, D, ... P

S, R

g1, g2, g3, G1

1) Select the branch joint diameters for the indoor unit

Based on the total capacity of the indoor unit, select the branch joint

for the indoor unit from the following table.

Table 4.3

Total capacity of

Capacity of indoor unit

indoor units

A (×100W)

A<168

168≤A<224

224≤A<330

330≤A<470

470≤A<710

710≤A<1040

1040≤A<1540

1540≤A<1800

1800≤A<2450

2450≤A<2690

2690≤A

Gas side

(mm)

Φ15.9

Φ19.1

Φ22.2

Φ28.6

Φ28.6

Φ31.8

Φ38.1

Φ41.3

Φ44.5

Φ54.0

Φ54.0 Φ28.6 FQZHN-07D

Liquid side

(mm)

Φ9.53

Φ9.53

Φ9.53

Φ12.7

Φ15.9

Φ19.1

Φ19.1

Φ19.1

Φ22.2 FQZHN-05D

Φ25.4 FQZHN-06D

Branch joint

FQZHN-01D

FQZHN-01D

FQZHN-02D

FQZHN-03D

FQZHN-03D

FQZHN-03D

FQZHN-04D

FQZHN-05D

3 Requirement 3: The largest level difference between indoor unit and

outdoor unit should not exceed 90m (if the outdoor unit is above) or

110m (if the outdoor unit is below). Additionally: (i) If the outdoor unit is

above and the level difference is greater than 20m, it is recommended

that an oil return bend with dimensions as specified in Figure 4.3 is set

every 10m in the gas pipe of the main pipe; and (ii) if the outdoor unit

is below and the level difference is more than 40m, the liquid pipe of

the main pipe (L1) should be increased one size.

4 Requirement 4: The largest level difference between indoor units

should not exceed 30m.

2) Select the diameter of the main piping

▪ The main pipe (L1) and first indoor branch joint (A) should be sized

according to whichever of Table 4.3, 4.4 and 4.5 indicates the larger

size.

Table 4.4

HP of
ODU

8HP

10HP

12~14HP

16HP

18~24HP

26~34HP

36~54HP

56~66HP

68~82HP

84~96HP

Equivalent length of all liquid piping < 90 m

Gas side
(mm)

Φ19.1

Φ22.2

Φ25.4

Φ28.6

Φ28.6

Φ31.8

Φ38.1

Φ41.3

Φ44.5

Φ50.8

Liquid side
(mm)

Φ9.53

Φ9.53

Φ12.7

Φ12.7

Φ15.9

Φ19.1

Φ19.1

Φ19.1

Φ22.2

Φ25.4

The first indoor

branch joint

FQZHN-02D

FQZHN-02D

FQZHN-02D

FQZHN-03D

FQZHN-03D

FQZHN-03D

FQZHN-04D

FQZHN-05D

FQZHN-05D

FQZHN-05D

7

Table 4.5

Model

8HP

10HP

12~14HP

16HP

18~24HP

26~34HP

36~54HP

56~66HP

68~82HP

84~96HP FQZHN-07D

The pipe thickness of the refrigerant piping shall comply with the
applicable legislation.
The minimal pipe thickness for R410A piping must be in
accordance with the table below.

Table 4.6

Piping outer diameter

(mm)

ø6.4

ø9.5

ø12.7

ø15.9

ø19.1

ø22.2

ø25.4

ø28.6

ø31.8

ø34.9

ø38.1

ø41.3

ø44.5

ø50.8

ø54.0

Material: Only seamless phosphorus-deoxidized copper piping that
complies with all applicable legislation should be used.
Thicknesses: Temper grades and minimum thicknesses for different
diameters of piping should comply with local regulations.
Design pressure of R410 refrigerant is 4.4MPa (44bar).

Equivalent length of all liquid piping ≥ 90 m

Gas side
(mm)

Φ22.2

Φ25.4

Φ28.6

Φ31.8

Φ31.8

Φ38.1

Φ41.3

Φ44.5

Φ54.0

Φ54.0

Minimum thickness

Liquid side
(mm)

Φ12.7

Φ12.7

Φ15.9

Φ15.9

Φ19.1

Φ22.2

Φ22.2

Φ25.4

(mm)

Φ22.2

Φ28.6

First branch joint

of the indoor unit

FQZHN-02D

FQZHN-02D

FQZHN-03D

FQZHN-03D

FQZHN-03D

FQZHN-04D

FQZHN-04D

FQZHN-05D

FQZHN-06D

Temper grade

0.80

0.80

1.00
M-type

1.00

1.00

1.00

1.00

1.00

1.25

1.25

Y2-type

1.50

1.50

1.50

1.80

1.80

▪ In some conditions, the pipe size needs to be one size up than

the standard size that is the “Size up Size” (for example: when

the equivalent length of all the liquid piping is larger than 90m,

the pipe size needs to be one size up; when the piping length

from the farthest indoor unit to the first indoor unit is more than

40m, the indoor main pipe size needs to be one size up to allow

the piping length up to 90m). In case the “Size up Size” is not

available in the local market, the standard size pipe must be

used.

▪ Pipe sizes bigger than corresponding “Size up Size” cannot be

used under any circumstances.

▪ Calculation for the additional refrigerant must be adjusted

according to section 5.9 on the determination of the additional

refrigerant volume.

3) Select the branch joint diameters for the outdoor unit

Select the branch joint of the outdoor unit from the table below.

Table 4.7

Outdoor

unit Qty.

2 units

3 units

g3

Illustration

g1g2

S

g1g2

S

G1

Main pipe

Main pipe

R

Table 4.8

Outdoor
unit Qty.

2 units

Outdoor connection
pipes diameter

g1, g2:
8~12HP: Φ25.4/Φ12.7;

Outdoor branch
joint kits

R:

FQZHW-02N1E

14~22HP: Φ31.8/Φ15.9

24-32HP:38.1/19.1

g1, g2,g3:

3 units

8~12HP: Φ25.4/Φ12.7;
14~22HP: Φ31.8/Φ15.9;

24-32HP:38.1/19.1

R+S:

FQZHW-03N1E

G1: Φ41.3/Φ22.2

Example: A system consisting of three outdoor units (32HP + 22HP

+ 12HP). The system's equivalent total liquid piping length is in

excess of 90m. Refer to Table 4.5, main pipe L1 is Φ 44.5/Φ22.2.

The total capacity index of all indoor units is 1794, refer to Table 4.3,

main pipe L1 is Φ41.3 / Φ19.1. Main pipe L1 is the larger of Φ44.5 /
Φ22.2 and Φ41.3 / Φ19.1, hence Φ44.5/Φ 22.2.

▪ If the required pipe size is not available, you can use other

diameters by considering the following factors:

▪ In case the standard size is not available in local market, one

size up pipe should be used.

Note

▪

For systems with multiple units, the branch joints of the
outdoor unit are sold separately.

4) indoor main piping

Table 4.9

Indoor unit
capacity
A(×100W)

A≤45

A≥56

8

Pipe length ≤ 10m Pipe length > 10 m

Gas side

(mm)

Φ12.7 Φ6.4

Liquid side

(mm)

Φ15.9 Φ9.53 Φ19.1

Gas side

Liquid side

(mm)

Φ15.9 Φ9.53

Φ12.7

(mm)

5) An Example of Refrigerant Piping Selection

The example below illustrates the piping selection procedure for a system
consisting of three outdoor units (32HP + 22HP + 12HP) and 17 indoor
units,asa shown in Figure 4.2. The system's equivalent length of all liquid
pipes is in excess of 90m; the piping between the farthest indoor unit and
the first indoor branch joint is less than 40m in length; and each indoor
auxiliary pipe (from each indoor unit to its nearest branch joint) is less than
10m in length.

▪ Select indoor main piping

Refer to Table 4.9 to select indoor auxiliary pipes (a-q)

▪ Select indoor main pipes and indoor branch joints B to P

The indoor units (N3 and N4) downstream of indoor branch joint E
have total capacity of 14 + 7.1 = 21.1kW. Refer to Table 4.3. Indoor

main pipe L5 is Φ19.1 / Φ9.53. Indoor branch joint E is FQZHN-01D.

▪ The indoor units (N1 to N8) downstream of indoor branch joint B have

total capacity of 14 x 5 + 11.2 + 7.1 + 2.8 = 91.1kW. Refer to Table 4.3.

Indoor main pipe L2 is Φ31.8 / Φ19.1. Indoor branch joint B is

FQZHN-03D.

▪ The other indoor main pipes and indoor branch joints are selected in

the same fashion.

▪ Select main pipe and indoor branch joint A

The indoor units (N1 to N17) downstream of indoor branch joint A have
total capacity of 14 x 9 + 11.2 x 2 + 7.1 x 2 + 5.6 x 2 + 2.8 x 2 =

179.4kW. The system's equivalent length of all liquid pipes is in excess
of 90m. The total capacity of the outdoor units is 32 + 22 + 12 = 66HP.

Refer to Table 4.3 and 4.5. Main pipe L1 is the larger of Φ41.3 / Φ19.1
and Φ44.5 / Φ22.2, hence Φ44.5 / Φ22.2. Indoor branch joint A is

FQZHN-05D.

▪ Select outdoor connection pipes and outdoor branch joints

The master unit is 32HP and the slave units are 22HP and 12HP. Refer

to Table 4.8. Outdoor connection pipes g1 isΦ25.4 / Φ12.7, g2 is Φ

31.8 / Φ15.9 and g3 is Φ38.1 / Φ19.1. Outdoor connection pipe G1 is
Φ41.3 / Φ22.2.

There are three outdoor units in the system. Refer to Table 4.8.
Outdoor branch joints S and R are FQZHW-03N1E.

× Incorrect

√ Correct

Figure 4.5

Figure 4.6

Arrangement and Layout of Multiple Outdoor Units

4.3.4

▪ The piping between the outdoor units must be level or slightly

upwards.

▪ The piping connecting the outdoor units should be horizontal and must

not be higher than the refrigerant outlets. If necessary, to avoid
obstacles the piping may be vertically offset below the outlets. When
inserting a vertical offset to avoid an obstacle, the whole outdoor
piping should be offset, rather than just the section adjacent to the
obstacle.

√ Correct

Figure 4.4

× Incorrect

Figure 4.7

Note

In systems with multiple outdoor units, the units should be
placed in order from largest capacity unit to smallest
capacity unit. The largest capacity unit must be placed on
the first branch, and be set as the master unit, while the
others should be set as slave units. The capacity of
outdoor units A, B and C must meet the following

conditions: A ≥ B ≥ C.

A

units

a

b

To indoor unit

a

Outdoor branch joint assembly (first branch joint)

b

Outdoor branch joint assembly (second branch joint)

c

B

c

C

9

Select and Prepare the Electrical Wiring

4.4

4.4.1

Safety device requirements

1. Select the wire diameters( minimum value) individually for each

unit based on the table 4.10 and table 4.11， where the rated
current in table 4.9 means MCA in table 4.11. In case the MCA
exceeds 63A, the wire diameters should be selected according to

the national wiring regulation.

2. Maximum allowable voltage range variation between phases is
2%.

3. Select circuit breaker that having a contact separation in all poles
not less than 3 mm providing full disconnection，where MFA is
used to select the current circuit breakers and residual current
operation breakers:

Table 4.11

Outdoor Unit Power Current Compressor OFM

System

Voltage

(V)

Hz Min.

(V)

Max.

(V)

MCA

(A)

TOCA

(A)

MFA

(A)

Table 4.10

Rated current
of appliance（A）

>3

>6

>10

>16

>25

>32

>50

MSC

(A)

and

and

and

and

and

and

and

RLA

(A)

≤3

≤6

≤10
≤16

≤25
≤32
≤50

≤63

Nominal cross-sectional area (mm2 )

Flexible cords Cable for fixed wiring

0.5 and 0.75

and

and

and

and

and

and

and

1

1.5

2.5

4

6

10

16

(A)

0.75

1

1.5

2.5

4

6

10

KW FLA

1

1

1

1.54to

2.56to

410to

616to

1025to

to

to

to

2.5

2.5

2.5

1

8HP

1

10HP

1

12HP

1

14HP

1

16HP

2

18HP

2

20HP

2

22HP

2

24HP

2

26HP

28HP

3

30HP

380-415

342 440 30.9

50/60

50/60

50/60

50/60

50/60

50/60

50/60

50/60

50/60

50/60

50/60

50/60

440 32380-415 342

440342 40380-415

440 40380-415 342

440 50380-415 342

440 50380-415 342

440 63380-415 342

440 63380-415 342

440 63380-415 342 0.92+0.9252.9 62.3

440 63380-415 342 0.92+0.9258.7 64.1

440 80380-415 342

24 32

25.2 30.9

26.4 31.5440 32380-415 342

33.1 40.3

33.1 40.3

40.8 59.3

43.9 60.1 0.56+0.56

47.9 60.1 0.56+0.56

48.4

62.3

-

-

-

-

-

10

10.6

15.4

25.8

25.8

-

-

-

-

17+16

19+18

17.4+16.6

-

-

64.9 72.5

-

20+30

0.56

0.56

0.56

0.92

0.92

0.56+0.56

0.92+0.92

0.92+0.92

6.3

6.3

6.9

7.3

7.3

10.114+13

10.9

10.9

13.1

13.120+19.8

14.922+21.8

14.9

Information

i

32HP

50/60

440 80380-415 342

66.9 72.5

Phase and frequency of power supply system: 3N~50/60 Hz
Voltage: 380-415 V

10

-

22+30

0.92+0.92

14.9

Outdoor Unit Installation

5

5.1

Overview

This chapter includes the following information:

Open the unit

▪

Outdoor unit installation

▪

Welding refrigerant piping

▪

Refrigerant piping check

▪

Refrigerant charging

▪

Power on the unit

▪

5.2

Open the Unit

5.2.1

Open the outdoor unit

▪

Dismantle lower panel: Each lower panel has 4 screws (8-22HP) or 6

screws (24-32HP) and 2 hooks. After dismantling, lift it up by about 3 mm

to take it out.

middle pillar

left pillar

left pillar

right pillar

To enter the unit, you need to open the front panel, as shown below:

▪

For 8-22HP, first dismantle the front left and right columns. For

24-32HP, first dismantle the front left, middle, and right columns,

where buckles are included in all 3 columns. Remove the screws,

rotate and shift upwards by about 2 mm to remove left and right

8-22HP

24-32HP

columns. Shift the middle column upwards by about 8 mm to take it

out.

▪

Dismantle upper panel: Each upper panel has 4 screws (8-22HP) or

6 screws (24-32HP). After dismantling, lift it up by about 3 mm to take

it out.

(left decorated column hook)

(middle decorated column hook)

(panel hook)

Figure 5.1

Open the electric control box of outdoor unit5.2.2

Once the front panel is opened, you can access the electric control box. Refer to section 5.2.2 on how to open the electric component box of the

outdoor unit.

▪

Remove the cover of electric control box: (1) Loosen the two screws (by turning counter-clockwise for 1 to 3 turns) from the cover of the electric
control box; (2) lift the cover upwards for 7 to 8 mm, and then turn it outwards for 10 to 20 mm; (3) slide down the cover to remove it.

Open and rotate the middle partition plate: (1) Loosen the two screws (by turning counter-clockwise for 1 to 3 turns) from the middle partition

▪

plate; (2) lift the partition plate upwards for 4 to 6 mm, and then turn it outwards to open the partition plate; (3) slide the hinge (which can slide
up and down along a sliding slot) at the bottom of the partition plate to the uppermost position to rotate the partition plate completely.

right pillar

5~10°

Note

Do not open the cover of electric control box until the prepareing of wireing is OK.

The

middle partition plate

is used for maintaining. Do not open it when installation

Figure 5.2

1

2

3

4

11

Outdoor Unit Installation

5.3

Prepare structure for installation

5.3.1

5

（1）Main board
（2） AC filter board
（3）Terminal block
（4）Comm. board
（5）Compressor drive board
（6）Compressor drive board
（7）DC fan drive board
（8）DC fan drive board
（9）Reactance
（10）Reatance

9

6

The heat radiator piping of the refrigerant is
connected to the system

Figure 5.3

10

Make sure the base where the unit is installed is strong enough to prevent
vibrations and noise.

▪

7

When there is a need to increase the installation height of the unit, it is
recommended that you use the installation structure shown in the
following figure. Use a rack to support the four corners of the unit where

8

necessary.

▪

The unit must be installed on a solid longitudinal base (steel beam
frame or concrete). Make sure the base below the unit is larger than the
area shaded in grey.

Outdoor unit

Φ10 Expansion bolt

Shock-absorbing
rubber cushion

Solid ground
or roof

200mm

≥100mm

Figure 5.5

Expansion bolt positioning (Unit: mm)

Minimum turning
angle (degrees)

Maximum turning
angle (degrees)

Figure 5.4

Caution

▪

Make sure the power supply is off before you carry out any
electric control installation and maintenance work.

▪

To remove the entire electric control box, first discharge the
refrigerant from the system, disconnect the pipe connecting
the refrigerant radiator at the bottom of the electric control
box. At the same time, remove all wiring connecting the
electric control box and the internal components of the air
conditioner.

▪

The images shown here are for illustrative purposes only and
may differ from the actual product due to reasons like model
and product upgrade. Please refer to the actual product.

B

A

C

D

15 x 23 U-shaped hole

Figure 5.6

▪

Use four ground bolts, M12, to secure the unit in place. Best is to screw in
the ground bolt until it is embedded in the base surface by at least 3 threads.

At least 3 threads

Note

▪

The base of the outdoor unit must use the solid concrete surface
as the cement base or the steel beam frame base.

▪

The base must be completely level to ensure that every point of
contact is even.

▪

During installation, make sure the base supports the vertical
folds of the front and back under plates of the chassis directly as
the vertical folds of the front and back under plates are Unit
where the actual support for the unit load is.

▪

No gravel layer is required when the base is built on the roof
surface, but the sand and cement on the concrete surface must
be level, and the base should be chamfered along the edge.

▪

A water drainage ditch should be set around the base to drain
the water around the equipment. Potential risk: slip.
Check the load-bearing capacity of the roof to make sure it can

▪

support the load.

▪

When you choose to install the piping from the bottom, the base
height should be above 200 mm.

12

SIZE

HP

8,10, 12 14,16,18, 20, 22 24,26,28, 30, 32

Outdoor refrigerant connecting pipe position

Unit: mmTable 5.1

5.4.3

The outdoor refrigerant connecting pipe position is shown in the
following figure.

8~12HP

14~ 22HP

A

B

C

D

Pipe Welding

5.4

Things to note when connecting the refrigerant piping

5.4.1

740

990

723

790

1090

1340

723

790

Caution

▪

During the test, do not exert a force greater than the
maximum allowed pressure on the product (as shown on the
nameplate).

▪

Take appropriate precautions to prevent refrigerant leakage.
Ventilate the area immediately if the refrigerant leaks.
Possible risk (An excessively high concentration of
refrigerant in an enclosed area can lead to anoxia (oxygen
deficiency); the refrigerant gas may produce a toxic gas if it
comes in contact with fire.)

▪

Refrigerant must be recovered. Do not release it to the
environment. Use professional fluorine extraction equipment
to extract the refrigerant from the unit.

Note

▪

Make sure the refrigerant piping is installed in accordance
with the applicable law.

▪

Make sure the piping and connections are not placed under
pressure.
After all the piping connections have been completed, check

▪

to make sure there is no gas leak. Use nitrogen to conduct
the leak check for gas.

1480

1730

723

790

24~32HP

Figure 5.7

5.4.4

Connecting refrigerant piping to outdoor unit

Note

▪

Note the precautions when connecting the field piping for the
refrigerant. Add brazing material.

▪

Use the attached piping fittings when working on the pipeline
engineering on site.

▪

After installation, make sure the piping does not come in contact
with each other, or the chassis.

The fittings provided as accessories can be used to complete the
connection from the stop valve to the field piping

5.4.2

Connect refrigerant piping

Before the refrigerant piping is connected, make sure both the indoor
and outdoor units are installed properly.
Connecting refrigerant piping includes:

▪

Connect refrigerant piping to outdoor unit

▪

Connect refrigerant piping to indoor unit (refer to the installation
manual of the indoor unit)

▪

Connecting VRF piping assembly

▪

Assembly for connecting refrigerant piping branch joint

▪

Bear in mind the following guidelines:

▪

Braze

▪

Stop valve is used correctly

5.4.5

Connecting VRF piping assembly

Caution

▪

The wrong installation will cause the unit to malfunction.

The branch joints should be as level as possible, and the angular error
does not exceed 10°.

U type branch joint

A

A-direction view

Error

Figure 5.8

Correct

10°
10°

Level

13

When there are multiple outdoor units, the branch joints must not be
higher than the refrigerant piping as shown below:

de

Figure 5.9

Brazing

5.4.6

▪

During brazing, use nitrogen as protection to prevent the formation
of a large amount of oxide film in the pipes. This oxide film will have
adverse effects on the valves and compressors in the cooling
system, and may hamper normal operations.

▪

Use the reducing valve to set the nitrogen pressure to 0.02~0.03
(a pressure that can be felt by the skin).

Packless valve

High pressure
hose for nitrogen
filling

Oxygen

Brazing part

Nitrogen

Copper pipe
fittings

Copper pipe

Copper pipe, 1/4"

Pipe interface fittings
for nitrogen filling

Figure 5.10

▪

Do not use antioxidants when brazing the pipe joints.

▪

Use copper-phosphorus alloys (BCuP) when brazing copper and
copper, and no flux is required. When brazing copper and other
alloy, flux is required.
Flux produces an extremely harmful effect on the refrigerant piping
system. For example, using a chlorine-based flux is used may
corrode the pipes, and when the flux contains fluorine, it will
degrade the frozen oil.

5.4.7

Connect stop valves

Mpa

a

c

b

a

Sealing component
Axis

b

Hexagonal hole

c
d

Stop valve lid

e

Maintenance access

Figure 5.12

Using of stop valve

1. Remove the stop valve lid.

2. Insert the hex wrench into the stop valve, and rotate the stop valve
counter-clockwise.

3. Stop turning when the stop valve cannot be rotated further.

Result: Valve is now open.

The fastening torque of the stop value is shown in table 5.2.
Insufficient torque may cause the refrigerant to leak.

2

3

1

4

Figure 5.13

Close stop valve

1. Remove the stop valve lid.

2. Insert the hex wrench into the stop valve, and rotate the stop valve
clockwise.

3. Stop turning when the stop valve cannot be rotated further.

Result: Valve is now closed.

Direction to close:

The stop valve

▪

The following figure shows the names of all parts required for the
installation of the stop valves.

▪

Stop valves are closed when unit is shipped from the factory.

Maintenance access and
its valve lid

Stop valve lid

Stop valve connection tube

Figure 5.11

Figure 5.14

Table 5.2 Fastening torque

Stop valve

size

(mm)

Ø12.7

Ø19.1

Ø22.2

Ø25.4

Ø28.6

Ø31.8
Ø35.0

14

Tightening torque/N.m (turn clockwise to close)

Axis

Valve body

9~30

12~30

16~30

24~30

25.0~35

5.5 Pipe Flushing

To remove dust, other particles and moisture, which could cause
compressor malfunction if not flushed out before the system is run,
the refrigerant piping should be flushed using nitrogen. Pipe flushing
should be performed once the piping connections have been
completed with the exception of the final connections to the indoor
units. That is, flushing should be performed once the outdoor units
have been connected but before the indoor units are connected.

Caution

▪ Only use nitrogen for flushing. Using carbon dioxide risks

leaving condensation in the piping. Oxygen, air, refrigerant,
flammable gases and toxic gases must not be used for
flushing. Use of such gases may result in fire or explosion.

The liquid and gas sides can be flushed simultaneously; alternatively,
one side can be flushed first and then Steps 1 to 8 repeated, for the
other side. The flushing procedure is as follows:

Cover the inlets and outlets of the indoor units to prevent dirt

1.
getting blown in during pipe flushing. (Pipe flushing should be
carried out before connecting the indoor units to the piping
system.)

Attach a pressure reducing valve to a nitrogen cylinder.

2.
Connect the pressure reducing valve outlet to the inlet on the

3.
liquid (or gas) side of the outdoor unit.

Use blind plugs to block all liquid (gas) side openings, except for

4.
the opening at the indoor unit which is furthest from the outdoor
units (“Indoor unit A” in Figure 5.15).

Start to open the nitrogen cylinder valve and gradually increase

5.

the pressure to 0.5Mpa.

Allow time for nitrogen to flow as far as the opening at indoor unit

6.
A.
Flush the first opening:

7.

a)

Using suitable material, such as a bag or cloth, press firmly
against the opening at indoor unit A.

b)

When the pressure becomes too high to block with your hand,
suddenly remove your hand allowing gas to rush out.

c)

Repeatedly flush in this manner until no further dirt or moisture
is emitted from the piping. Use a clean cloth to check for dirt or
moisture being emitted. Seal the opening once it has been
flushed.

Flush the other openings in the same manner, working in

8.
sequence from indoor unit A towards the outdoor units. Refer to
Figure 5.16.

Once flushing is complete, seal all openings to prevent dust and

9.
moisture from entering.

5.6 Gastightness Test

To prevent faults caused by refrigerant leakage, a gastightness test
should be performed before system commissioning.

Caution

▪ Only dry nitrogen should be used for gastightness testing.

Oxygen, air, flammable gases and toxic gases must not be
used for gastightness testing. Use of such gases may result
in fire or explosion.

▪ Make sure that all the outdoor unit stop valves are firmly

closed.

The gastightness test procedure is as follows:

Once the piping system is complete and the indoor and outdoor

1.
units have been connected, vacuum the piping to -0.1Mpa.

Charge the indoor piping with nitrogen at 0.3Mpa through the

2.
needle valves on the liquid and gas stop valves and leave for at
least 3 minutes (do not open the liquid or gas stop valves).
Observe the pressure gauge to check for large leakages. If there
is a large leakage, the pressure gauge will drop quickly.

If there are no large leakages, charge the piping with nitrogen at

3.

1.5Mpa and leave for at least 3 minutes. Observe the pressure
gauge to check for small leakages. If there is a small leakage, the
pressure gauge will drop distinctly.

If there are no small leakages, charge the piping with nitrogen at

4.

4.2 Mpa and leave for at least 24 hours to check for micro leakages.
Micro leakages are difficult to detect. To check for micro leakages,
allow for any change in ambient temperature over the test period
by adjusting the reference pressure by 0.01Mpa per 1°C of
temperature difference. Adjusted reference pressure = Pressure
at pressurization + (temperature at observation – temperature at
pressurization) x 0.01Mpa. Compare the observed pressure with
the adjusted reference pressure. If they are the same, the piping
has passed the gastightness test.
lower than the adjusted reference pressure, the piping has a micro
leakage.

If the leakage is detected, refer to following part “Leak detection”.

5.
Once the leak has been found and fixed, the gastightness test
should be repeated.

If not continuing straight to vacuum drying once the gastightness

6.
test is complete, reduce the system pressure to 0.5-0.8Mpa and
leave the system pressurized until ready to carry out the vacuum
drying procedure

Outdoor unit

If the observed pressure is

liquid pipe
gas pipe

Indoor

unit A

Outdoor

unit

Indoor

unit B

Figure 5.15

Figure 5.16

Nitrogen gas

cylinder

Liquid side
stop valve

Nitrogen

Gas pipe
Liquid pipe

Gas side of stop valve

Figure 5.17

Leak detection

The general methods for identifying the source of a leak are as
follows:

Audio detection: relatively large leaks are audible.

1.
Touch detection: place your hand at joints to feel for escaping gas.

2.
Soapy water detection: small leaks can be detected by the

3.
formation of bubbles when soapy water is applied to a joint.

15

Indoor unit

5.7 Vacuum Drying

Humidity<80%RH
Thickness

Humidity<80%RH
Thickness

Humidity<80%RH
Thickness

Vacuum drying should be performed in order to remove moisture and
non-condensable gases from the system. Removing moisture
prevents ice formation and oxidization of copper piping or other
internal components. The presence of ice particles in the system
would cause abnormal operation, whilst particles of oxidized copper
can cause compressor damage. The presence of non-condensable
gases in the system would lead to pressure fluctuations and poor heat
exchange performance.
Vacuum drying also provides additional leak detection (in addition to
the gastightness test).

Caution

▪ Before performing vacuum drying, make sure that all the

outdoor unit stop valves are firmly closed.

▪ Once the vacuum drying is complete and the vacuum pump is

stopped, the low pressure in the piping could suck vacuum
pump lubricant into the air conditioning system. The same
could happen if the vacuum pump stops unexpectedly during
the vacuum drying procedure. Mixing of pump lubricant with
compressor oil could cause compressor malfunction and a
one-way valve should therefore be used to prevent vacuum
pump lubricant seeping into the piping system.

During vacuum drying, a vacuum pump is used to lower the pressure
in the piping to the extent that any moisture present evaporates. At
5mmHg (755mmHg below typical atmospheric pressure) the boiling
point of water is 0°C. Therefore a vacuum pump capable of
maintaining a pressure of -756mmHg or lower should be used. Using
a vacuum pump with a discharge in excess of 4L/s and a precision
level of 0.02mmHg is recommended.The vacuum drying procedure is
as follows:

1. Connect the blue (low pressure side) hose of a pressure gauge to
the master unit gas pipe stop valve, the red (high pressure side)
hose to the master unit liquid pipe stop valve and the yellow hose
to the vacuum pump.

2. Start the vacuum pump and then open the pressure gauge valves
to start vacuum the system.

3. After 30 minutes, close the pressure gauge valves.

4. After a further 5 to 10 minutes check the pressure gauge. If the
gauge has returned to zero, check for leakages in the refrigerant
piping.

5. Re-open the pressure gauge valves and continue vacuum drying
for at least 2 hours and until a pressure difference of 0.1Mpa or
more has been achieved. Once the pressure difference of at least

0.1Mpa has been achieved, continue vacuum drying for 2 hours.

6. Close the pressure gauge valves and then stop the vacuum pump.

7. After 1 hour, check the pressure gauge. If the pressure in the
piping has not increased, the procedure is finished. If the pressure
has increased, check for leakages.

8. After vacuum drying, keep the blue and red hoses connected to
the pressure gauge and to the master unit stop valves, in
preparation for refrigerant charging.

Yellow hose

Pressure gauge

Master unit Slave unit

③
①
②

Slave unit

5.8 Piping Insulation

After the leak test and the vacuum drying are completed, the pipe
must be insulated. Considerations:

▪ Make sure the refrigerant piping and branch joints are completely

insulated.

▪ Make sure the liquid and gas pipes (for all units) are insulated.
▪ Use heat-resistant polyethylene foam for the liquid pipes (able to

withstand temperature of 70°C), and polyethylene foam for the gas
pipes (able to withstand temperature of 120°C).

▪ Reinforce the insulation layer of the refrigerant piping based on the

installation environment.

Condensed water may form on the surface of the insulation layer.

Piping size

Φ6.4~38.1mm

Φ41.3~54.0mm

5.9 Refrigerant Charging

Humidity<80%RH
Thickness

≥15mm

≥20mm

Humidity≥80%RH
Thickness

≥20mm

≥25mm

Warning

▪ Use only R410A as the refrigerant. Other substances may

cause explosions and accidents.

▪ R410A contains fluorinated greenhouse gases, and the GWP

value is 2088. Do not discharge the gas into the atmosphere.

▪ When charging the refrigerant, make sure you wear

protective gloves and safety glasses. Be careful when you
open the refrigerant piping.

Note

▪

If the power supply of some units is off, the charging program
cannot be completed normally.
If this is a multi-unit outdoor system, the power supply for all

▪

outdoor units should be turned on.

▪

Make sure the power supply is turned on 12 hours before
operations so that the crankcase heater is properly energized.
This is also to protect the compressor.

▪

Make sure all connected indoor units have been identified.

▪

Charge the refrigerant only after the system has not failed the
gas tightness tests and vacuum drying.

▪

Volume of refrigerant charged must not exceed the designed
amount.

Calculating additional refrigerant charge

The additional refrigerant charge required depends on the lengths and
diameters of the outdoor and indoor liquid pipes. Table below shows
the additional refrigerant charge required per meter of equivalent pipe
length for different diameters of pipe. The total additional refrigerant
charge is obtained by summing the additional charge requirements for
each of the outdoor and indoor liquid pipes, as in the following formu­la, where T1 to T8 represent the equivalent lengths of the pipes of
different diameters. Assume 0.5m for the equivalent pipe length of
each branch joint.

Vacuum pump

Blue hose

Red hose

Figure 5.18

Field piping

①

Gas pipe stop valve

②

Liquid pipe stop valve
Service port

③

16

Liquid side

piping (mm)

Φ6.4

Φ9.53
Φ12.7
Φ15.9

Φ19.1
Φ22.2
Φ25.4
Φ28.6

Additional refrigerant charge per meter

of equivalent length of piping (kg)

0.022kg

0.057kg

0.110kg

0.170kg

0.260kg

0.360kg

0.520kg

0.680kg

Additional refrigerant charge R (kg) = (T1@Φ6.4) × 0.022 + (T2@Φ9.53) ×

0.057 + (T3@Φ12.7) × 0.110 + (T4@Φ15.9) × 0.170 + (T5@Φ19.1) ×

0.260 + (T6@Φ22.2) × 0.360 + (T7@Φ 25.4) × 0.520 + (T8@Φ28.6) ×

0.680
The procedure for adding refrigerant is as follows:

1. Calculate additional refrigerant charge R (kg) .

2. Place a tank of R410A refrigerant on a weighing scale. Turn the tank
upside down to ensure refrigerant is charged in a liquid state. (R410A
is a blend of two different chemicals compounds. Charging gaseous
R410A into the system could mean that the refrigerant charged is not
of the correct composition).

3. After vacuum drying, the blue and red pressure gauge hoses should
still be connected to the pressure gauge and to the master unit stop
valves.

4. Connect the yellow hose from the pressure gauge to the R410A
refrigerant tank.

5. Open the valve where the yellow hose meets the pressure gauge, and
open the refrigerant tank slightly to let the refrigerant eliminate the air.
Caution: open the tank slowly to avoid freezing your hand.

6. Set the weighing scale to zero.

7. Open the three valves on the pressure gauge to begin charging
refrigerant.

8. When the amount charged reaches R (kg), close the three valves. If
the amount charged has not reached R (kg) but no additional
refrigerant can be charged, close the three valves on the pressure
gauge, run the outdoor units in cooling mode, and then open the
yellow and blue valves. Continue charging until the full R (kg) of
refrigerant has been charged, then close the yellow and blue valves.
Note: Before running the system, be sure to complete all the
pre-commissioning checks and be sure to open all stop valves as
running the system with the stop valves closed would damage the
compressor.

Pressure gauge

Yellow hose

R410A
refrigerant tank

Weighing scale

Blue hose

Master unit Slave unit Slave unit

③
①
②

Red hose

Field piping

①
②
③

Gas pipe stop valve
Liquid pipe stop valve
Service port

Figure 5.19

5.10 Electrical Wiring

5.10.1 Electrical wiring precautions

Warning

▪ Take note of the risk of electric shocks during installation.
▪ All the electric wires and components must be installed by an

installation personnel with the proper electrician certification,
and the installation process must comply with the applicable
regulations.

▪ Use only wires with copper cores for the connections.
▪ A main switch or safety device that can disconnect all

polarities must be installed, and the switching device can be
completely disconnected when the corresponding excessive
voltage situation arises.

▪ Wiring must be carried out in strict accordance with what is

stated in the product nameplate.

▪ Do not squeeze or pull the unit connection, and make sure the

wiring is not in contact with the sharp edges of the sheet metal.

▪ Make sure the grounding connection is safe and reliable. Do

not connect the earth wire to public pipes, telephone earth
wires, surge absorbers and other places that are not designed
for grounding. Improper grounding may cause electric shock.

▪ Make sure the fuses and circuit breakers installed meet the

corresponding specifications.

▪ Make sure an electric leakage protection device is installed to

prevent electric shocks or fires.

▪ The model specifications and characteristics (anti high-fre-

-quency noise characteristics) of the electric leakage protection
device are compatible with the unit to prevent frequent
tripping.

▪ Before power on, make sure the connections between the

power cord and terminals of the components are secure, and
the metallic cover of the electric control box is closed tightly.

Note

▪ If the power supply lacks N phase or there is an error in the N

phase, the device will malfunction.

▪ This product comes with a three-phase detection circuit that is

used to check if the wiring is reversed when the unit is power on.

▪ The three-phase detection circuit only works when the product

is in standby status. It cannot conduct the reverse phase
checking when the product is operating normally.

▪ If the reverse-phase protection is triggered, you only need to

replace any two of the three phases (A, B, C).

▪ Some power equipment may have an inverted phase or

intermittent phase (such as a generator). For this type of power
sources, a reverse-phase protection circuit should be installed
locally in the unit, as operating in the inverted phase may
damage the unit.

▪ Do not share the same power supply line with other devices.
▪ The power cord may produce electromagnetic interference so

you should maintain a certain distance from equipment that
may be susceptible to such interference.

▪ Indoor units in the same system must be powered by the same

power supply, in order not to damage the system.

▪ Separate power supply for the indoor and outdoor units.
▪ For systems with multiple units, make sure a different address

is set for each outdoor unit.

17

5.10.2 Wiring layout (overview)

Wiring layout comprises of the power cords and communication wiring
between the indoor and outdoor units. These include the earth lines, and
the shielded layer of the earth lines of the indoor units in the P,Q,E
communication line. See below for an example of a wiring layout.

a

b b b

j

j

j

5.10.4 Communication wiring layout

5.10.4.1 Wiring mode

Communication wiring of indoor unit: The P,Q,E communication line
should be connected in a chain starting from the outdoor unit to each
indoor unit one by one up to the last indoor unit. In the last indoor
unit, connect a resistor of 120 ohms between the P and Q terminals.
The correct and wrong connection methods are demonstrated below:

g

c

h

c

e

c

h

f

j

b bbbb

d

i i i i i

a. Three-phase power supply (with earth lines and leakage
protection)
b. Power distribution box
c. Power supply terminal of outdoor unit
d. Single phase power supply (with earth lines and leakage
protection)
e. H1, H2 and E communication wire(with shielded layer)
f. P, Q and E communication wire(with shielded layer)
g. Earth line
h. Outdoor unit
i. Indoor unit
j. Main switch (with leakage protection)

Figure 5.20

5.10.3 About wiring layout

Note

▪ Power cords and communication wiring must be laid out

separately, they cannot be placed in the same conduit. Use a
power supply conduit to isolate if the current of the power supply
is less than 10 A. If the current is greater than 10 A but less than
50 A, the spacing must exceed 500 mm at all times; otherwise; it
may lead to electromagnetic interference.

▪ Arrange the refrigerant piping, power cords and communication

wiring in parallel, but do not tie the communication lines together with
the refrigerant piping or power cords.

▪ Power cords and communication wiring should not come in

contact with the internal piping so as to prevent the high
temperature piping from damaging the wires.

▪ Once the wiring layout is completed, close the lid tightly to prevent

the wiring and terminals from being exposed when the lid is loose.

Master

unit

P Q E

P Q E

Indoor unit

P Q E P Q E

Indoor unit

Master

unit

P Q E

P Q E

P Q E P Q E

Indoor unit

Indoor unit Indoor unit Indoor unit Indoor unit

Do not connect two chains from one outdoor unit.

Master

unit

P Q E

P Q E

P Q E P Q E

Indoor unit Indoor unit

P Q E

Indoor unit

Indoor unit

Indoor unit

P Q E

Indoor unit

P Q E

Figure 5.21

After the last indoor unit, the communication wiring should not
route back to the outdoor unit as this will form a closed loop.

Communication wiring of outdoor unit: The H1H2E communication
lines of the outdoor unit should be connected in a chain starting from
the master unit to the last slave unit. As shown below.

Master

unit

H1 H2 E

Slave

unit

Slave

unit

H1 H2 E

18

Figure 5.22

Note

▪ Three-core shielded cable should be used for communication

wiring.The cross-sectional area of each core of the communica­tion wiring is not less than 0.75 mm2, and the length must not
exceed 1200m. A communication error may result when the
communication wiring exceeds these limitations.

5.10.4.2 Place and fix communication wiring

Place the communication wiring along the front of the unit, and secured
with a corresponding tie.

When fixing the communication wiring, the height on both sides of the
clamp should be the same so as to avoid any height difference when
all are placed together on one side or both sides. as shown below:

: Communication wire

Proper communication wiring connections

P Q E H1 H2 E

O A E

P Q E X Y E

H1 H2 E

a

b

a. Wire clamp
b. Via for communication wiring

5.10.4.3 Communications wiring

The communication wiring of the indoor unit must be connected to the
P,Q,E terminal on the PCB of the communication terminals block of the
outdoor unit. The communication wiring between outdoor units must be
connected to the H1,H2,E terminals on the PCB of the communication
terminals block of the outdoor unit.

Figure 5.23

Improper

Installation of a single outdoor unit is as below:

communication wiring connections

ODU

H 1 H 2 EP Q E

IDU IDU IDU

P Q E P Q E P Q E

Installation of multiple outdoor units is as below:

ODU (Master) ODU (Slave) ODU (Slave)

H 1 H 2 EP Q E

H 1 H 2 EP Q E

Figure 5.25

Figure 5.26

H 1 H 2 EP Q E

K1 K2 E E X Y E EP QO A EH1 H2

communication cnnections

Terminals

Connect to outdoor unit centralized monitor

K1 K2 E

O A E
X Y E

P Q E

H1 H2 E

(Suitable for some models)
Connect to digital energy meter
Connect to indoor unit centralized controller
Connect between indoor units and master outdoor unit
Connect between outdoor units

Connection

Figure 5.24

IDU IDU IDU

P Q E P Q E P Q E

Figure 5.27

The recomend tightening torque for the communication terminals

block is as follows:

Screw Specification

M3 0.5~0.6

Tightening

torque, N.m

19

Note

When there are multiple outdoor units in the same system,

▪

the H1,H2,E of one unit must be connected to the H1,H2,E of
another unit. Connection to the P,Q,E will cause a system
malfunction.
In systems with multiple outdoor units, each outdoor unit
should be set address. Only the master outdoor unit can

▪

communicate with indoor units.
Before the performance test, set the number of the indoor
unit, the address of the outdoor unit and so on. After the test

▪

run is completed, you cannot randomly change these DIP
switches.

5.10.5 Connecting the power cord

5.10.5.1 Fixing the power cord

5.10.5.2 Power cord connections

Note

▪ Do not connect the power supply to the terminal box of

the communication box. Otherwise, the whole system may
fail.

▪ You must first connect the earth line (note that you

should use only the yellow-green wire to connect to
earth, and you must turn off the power supply when you
are connecting the earth line) before you connect the
power cord. Before you install the screws, you must first
comb through the path along the wiring to prevent any
part of the wiring from becoming exceptionally loose or
tight because the lengths of the power cord and earth line
are not consistent.

▪ The wire diameter must comply with the specified

specification, and make sure the terminal is screwed
tight. At the same time, do not subject the terminal to any
external force.

▪ Do tighten the terminal with an appropriate screwdriver.

Screwdrivers that are too small may damage the terminal
head, and cannot tighten it.

▪ Excessive tightening of the terminal may cause the

screw thread to deform and slip, making it impossible to
connect the components securely.

▪ Only use a ring terminal to connect the power cord.

Non-standard cable connection will lead to poor contact
which may in turn cause exceptional heating and
burning. The figure below demonstrates both the correct
and wrong connections.

A B C N

Power supply

A

B C N

A B C N

A B C N

Figure 5.28

A B C N

Figure 5.29

20

The size of the screws (power supply terminal specifications) and
recommended torque are as follows:

Screw Specification

M8

Steps to fix the power cord:

1. First, peel part of the skin of the outermost insulating layer (refer to
the third point below for the specific length). Connect the power
cable to the terminal, and install the screws.

2. Position the wire clip. Be careful not to reverse the first step, or it
will be difficult to install the screws.

3. The wire clip has been fixed at a position on the sheet metal near
the terminal of the electric control box. Put the power cable in the
corresponding slot between the base and upper cover. Select the
appropriate slot based on the specific diameter of the cable. When
the cross-sectional area of the power cable is less than 10 mm2,
place the entire power cord inside the slot. At this time, make sure
both the length of the peel and the length of the terminal are less
than 70 mm, as shown below.

Tightening
torque, N.m

5.5~7.0

6 Configuration

6.1 Overview

This chapter describes how the system configuration can be implemented
once the installation is complete, and other relevant information.
It contains the following information:

▪ Implement field settings
▪ Energy-saving and optimized operation
▪ Using the Leak Check function

Information

i

The installation personnel should read this chapter.

6.2 Dial Switch Settings

Dial code definitions:

S4

S5

1 2 3

1 2 3

means 0

Standard static pressure (default)

000

001

Low static pressure mode (reserved)

Medium static pressure mode (reserved)

010

High static pressure mode (reserved)

011

Super high static pressure mode (reserved)

100

Auto priority (default)

000

Cooling priority

001

VIP priority or voting priority

010

Heating only

011

Cooling only

100

Set priority mode via centralized controller

111

means 1

Figure 5.30

When the cross sectional area of the power cable
exceeds 10 mm2, place the power cables separately
in the slot. When the skin is peeled, make sure the
sum of the length of the peel and the length of the
terminal is between 100 mm and 200 mm, as shown
below.

Then, use 3 pieces of M4*30mm screws to secure
the upper cover. At the same time, be careful not to
screw it too tight. If you use excessive force to twist
to the end, you may destroy the protection layer of
the power cable.

Figure 5.31

S6-1

S6-2

S6-3

S8-1

S8-2

S8-3

S7

1 2 3

1 2 3

1 2 3

1 2 3

1 2 3

1 2 3

0

Reserved

0

No action (default)

Clear indoor unit addresses

1

Auto addressing (default)

0

Manual addressing

1

0

Reserved

0

Start-up time is 12 minutes (default)

Start-up time is 7 minutes

1

0

Reserved

0

Reserved

Note

▪

Do not connect the power cables of multiple outdoor
units in series. The power cable of each outdoor unit
must be drawn out by the power supply control box.

21

ENC1

ENC2

ENC4

ENC3
&S12

ENC5

1 2 3

1 2 3

1 2 3

1 2 3

Outdoor unit address setting, Only 0, 1,
2 should be selected(default is 0)

0-2

0 is for master unit; 1, 2 are for slave
units.

Outdoor unit capacity setting, Only 0 to
C should be selected 0 to C are for 8HP

0-C

to 32HP.

Outdoor unit network address setting,
Only 0 to 7 should be selected (default

0-7

is 0).

The number of indoor units is in the

0-F

range 0-15
0-9 on ENC3 indicate 0-9 indoor units;

000

A-F on ENC3 indicate 10-15 indoor units

The number of indoor units is in the

0-F

range 16-31
0-9 on ENC3 indicate 16-25 indoor units;

001

A-F on ENC3 indicate 26-31 indoor units

The number of indoor units is in the

0-F

32-47

0-9 on ENC3 indicate 32-41 indoor units;

010

A-F on ENC3 indicate 42-47 indoor units

The number of indoor units is in the

0-F

range 48-63
0-9 on ENC3 indicate 48-57 indoor units;

011

A-F on ENC3 indicate 58-63 indoor units

0

Night silent time is 6h/10h (default)

1

Night silent time is 6h/12h

2

Night silent time is 8h/10h

3

Night silent time is 8h/12h

4

No silent mode

Silent mode 1 (only limit max. fan speed)

5

Silent mode 2 (only limit max. fan speed)

6

7

Silent mode 3 (only limit max. fan speed)

Super silent mode 1 (limit max. fan speed

8

and compressor frequency)

Super silent mode 2 (limit max. fan speed

9

and compressor frequency)

Super silent mode 3 (limit max. fan speed

A

and compressor frequency)

Super silent mode 4 (limit max. fan speed

B

and compressor frequency)

range

6.3 Digital Display and Button Settings

DSP1 DSP2

SW5 SW4 SW3 SW6

MENU DOWN UP OK

6.3.1 Digital display output

Parameters

Outdoor unit state

displayed on

DSP1

Standby

Unit's address

For single
compressor

Normal
operation

units

For dual
compressor
units

Error or protection
In menu mode
System check

--

Running speed of
compressor B in
rotations per
second

-- or placeholder Error or protection code
Display menu mode code
Display system check code

6.3.2 Function of buttons SW3 to SW6

Button Function

SW3 (UP)

SW4 (DOWN)

In menu mode: previous and next buttons for
menu modes.
Not in menu mode: previous and next buttons for
system check information.

SW5 (MENU) Enter / exit menu mode.

SW6 (OK) Confirm to enter specified menu mode.

Parameters displayed

The number of indoor
units in communication
with the outdoor units

Running speed of the
compressor in rotations
per second

Running speed of
compressor A in
rotations per second

on DSP2

Set silent mode via centralized

F

controller

Note

▪

Operate the switches and push buttons with an insulated
stick (such as a closed ball-point pen) to avoid touching of
live parts.

6.3.3 Menu mode

Only master unit has the full menu functions, slaves units only have
error codes check and cleaning functions.

1. Long press SW5 “MENU” button for 5 seconds to enter menu
mode, and the digital display displays “n1”;

2. Press SW3 / SW4 “UP / DOWN” button to select the first level
menu “n1”, “n2”, “n3”, “n4”or “nb”;

3. Press SW6 “OK” button to enter specified first level menu, for
example, enter “n4” mode;

4. Press SW3 / SW4 “UP / DOWN” button to select the second level
menu from “n41” to “n47”;

5. Press SW6 “OK” button to enter specified second level menu, for
example, enter “n43” mode;

22

Menu mode selection flowchart:

DescriptionMENU

Note

Press “menu”

Press “menu”

Press “menu”

Press “menu”

Start

Long press “menu” 5 seconds

Display “-n1”

Press “up” or “down” to choose “X”

Display “-nX”

Press “OK” to confirm “X”

Display “-nXY”

Press “up” or “down” to choose “Y”

Display “-nXY”

Press “OK” to confirm “Y”

Confirm “-nXY”

Press “OK” to confirm “X”

Press “OK” to confirm “Y”

1

2

Only available for the master unit, the system does not check the indoor

3

units’ number.
Only available for outdoor unit with two compressors. If one of the two

4

compressors is fail, the other compressor will keep running for up to 4
days and then stop automatically.

5

6

7

8

9

10

11

12

n14

n15

n16

n24

n25

n26

n27

n31

n32

n33

n34

n41

n42

n43

n44

n45

n46

n47

nb1

nb2

nb3

nb4

nb5

nb6

nb7

nb8

nF1

nF2

Debug mode 1

Debug mode 2

Maintenance mode

Reserved

Reserved

Backup run

Vacuum mode

History codes

Cleaning history error

Reserved

Restore factory settings

Power limitation mode 1

Power limitation mode 2

Power limitation mode 3

Power limitation mode 4

Power limitation mode 5

Power limitation mode 6

Power limitation mode 7

Fahrenheit degree (°F)

Celsius degree (°C)

Exit auto energy saving mode

Enter auto energy saving mode

Auto snow-blowing mode 1

Auto snow-blowing mode 2

Exit auto snow-blowing mode

VIP address setting

Reserved

Reserved

1

2

3

4

Display“R006”

5

6

7

8

9

10

11

12

Only available for master unit

Only available for master unit

Only available for master unit

Only available for master unit

Only available for master unit(all indoor units running in cooling mode)

Only available for master unit(if all the indoor unit in the system are the
2nd generation indoor units, all the indoor units will run in heating mode.
Once there is one or more old indoor unit in the system, all the indoor
units will run in force cooling mode)

Only available for the master unit

Only available for the master unit, 100% capacity output

Only available for the master unit, 90% capacity output

Only available for the master unit, 80% capacity output
Only available for the master unit, 70% capacity output
Only available for the master unit, 60% capacity output

Only available for the master unit, 50% capacity output
Only available for the master unit, 40% capacity output

23

6.3.4 UP / DOWN system check button

Before pressing UP or DOWN button, allow the system to operate steadily for more than an hour. On pressing UP or DOWN button, the parameters
listed in below table will be displayed in sequence.

DSP1

content

0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

--

Unit address

Unit capacity

Number of outdoor units

Number of indoor units as set on PCB

Total capacity of outdoor unit

Total capacity requirement of indoor units

Total capacity requirement correction of master unit

Operating mode

Outdoor unit actual operating capacity
Fan A speed index

Fan B speed index

T2/T2B average Temp (°C)

Main heat exchanger pipe(T3) temperature (°C)

Outdoor ambient(T4) temperature (°C)

Plate heat exchanger cooling refrigerant inlet (T6A) temperature (°C)

Plate heat exchanger cooling refrigerant outlet (T6B) temperature (°C)

Discharge Temp. of compressor A (°C)

Discharge Temp. of compressor B (°C)

Inverter-module heatsink Temp. A (°C)

Inverter-module heatsink Temp. B (°C)

Plate exchanger degree of superheat (°C)

Discharge superheat degree

Inverter compressor A current (A)

Inverter compressor B current (A)

EEVA position

EEVB position

EEVC position

Compressor discharge pressure (Mpa)

Reserved

Number of indoor units currently in communication with master unit

Number of indoor units currently operating

Priority mode

Silent mode

Static pressure mode

Reserved

Reserved

DC bus voltage A

DC bus voltage B

Reserved

Address of VIP indoor unit

Reserved

Reserved

Refrigerant state

Reserved

Power mode

Most recent error or protection code

--

Parameters displayed on DSP2 Remarks

0-2

8-32HP

1

1

2

1

1

3

4

4

5

6

Reserved

1

7

8

9

10

10

11

12

Check end

1

Available for master unit

Only available for master unit, displayed on slave units has no sense;

2

3

Operation mode: 0-OFF; 2-Cooling; 3-Heating;4-Forced cooling

4

Opening angle of EEV: Actual value=Display value*4(480P) or Actual value=Display value*24(3000P)

5

Opening angle of EEV: Actual value=Display value*4(480P)

High pressure: Actual value=Display value*0.1Mpa

6
7

Priority mode: 0-Auto priority, 1-cooling priority, 2-VIP priority or voting priority, 3-Heating only, 4-Cooling only

8

Silent mode: 0-Night silent time is 6h/8h, 1-Night silent time is 6h/12h, 2-Night silent time is 8h/10h, 3-Night silent time is 8h/12h, 7-Silent mode 3,8-Super silent mode

1, 9-Super silent mode 2, 10-Super silent mode 3, 11-Super silent mode 4;

9

Static pressure mode: 0-Standard static pressure, 1-Low Static pressure, 2-Medium static pressure, 3-High static pressure, 4-Super high static pressure;

10

DC bus voltage: Actual value=Display value*10 V

11

Refrigerant quantity: 0-Normal, 1-Slightly excessive, 2-Significantly excessive, 11-Slightly insufficient, 12-Significantly insufficient, 13-Critically insufficient.

12

0-100% capacity output, 1-90% capacity output, 2-80% capacity output, 3-70% capacity output, 4- 60% capacity output, 5-50% capacity output, 6- 40% capacity

output. 10-Auto power save mode, 100% capacity output. 11-Auto power save mode, 90% capacity output, 12-Auto power save mode, 80% capacity output, 13-Auto

power save mode, 70% capacity output, 14-Auto power save mode, 60% capacity output, 15-Auto power save mode, 50% capacity output, 16-Auto power save

mode, 40% capacity output.

24

7 Commissioning

7.1 Overview

After installation, and once the field settings have been defined, the
installation personnel is obliged to verify the correctness of the operations.
Hence, you must follow the steps below to perform the test run.
This chapter describes how the test run can be carried out once the
installation is complete, and other relevant information.
The test run usually includes the following stages:

1. Review the "Checklist Before Test Run".

2. Implement the test run.

3. If necessary, correct the errors before the test run completes with
exceptions.

4. Run the system

7.2 Things to Note During Test Run

Warning

During the test run, the outdoor unit operates at the same time
with the indoor units connected to it. It is very dangerous to
debug the indoor unit during the test run.
Do not insert fingers, sticks, or other items into the air inlet or
outlet. Do not remove the fan mesh cover. When the fan rotates
at a high speed, it may cause bodily injury.

7.3 Checklist Before Test Run

Once this unit is installed, check the following items first. After all the following
checks have been completed, you must shut down the unit. This is the only way
to start the unit again.

Installation

Check if the unit is installed correctly to prevent strange noises and
vibrations when the unit starts.

Field wiring

Based on the wiring schematic and the relevant regulations, make
sure the field wiring is based on the instructions described in
section 5.10 on connecting wires.

Power voltage

Check the power voltage on the local power supply board. The
voltage must correspond to the voltage on the identification label
of this unit.

Earth line

Make sure the earth line is connected correctly, and the grounding
terminal is tight.

Insulation test of main circuit

Use the megameter of 500V, apply a voltage of 500V DC between
the power terminal and the earth terminal. Check that the insulation

resistance is above 2 MΩ. Do not use the megameter on the

transmission line.

Fuses, circuit breakers, or protection devices

Check that the fuses, circuit breakers, or locally installed protection
devices comply with the size and type specified in section 4.4.2 on
the requirements for safety devices. Make sure you use fuses and
protection devices.

Note

Note that the required input power may be higher when this unit
is run for the first time. This phenomenon is due to the
compressor which needs to run for 50 hours before it can
achieve a stable operating and power consumption state.
Make sure the power supply is turned on 12 hours before
operations so that the crankcase heater is properly energized.
This is also to protect the compressor.

Information

i

The test run can be carried out when the ambient temperature is
between -20°C and 35°C.

During the test run, the outdoor and indoor units will start at the same
time. Make sure all the preparations for the indoor unit have been
completed. Please refer to the installation manual of the indoor unit for
the relevant details.

Internal wiring

Visually inspect if the connections between the electrical component
box and the interior of the unit is loose, or if the electrical components
are damaged.

Piping dimensions and insulation

Make sure the installation piping dimensions are correct, and the
insulation work can be carried out normally.

Stop valve

Make sure the stop valve is open on both the liquid and gas sides.

Equipment damage

Check for damaged components and extruded piping inside the unit.

Refrigerant leak

Check for refrigerant leaks inside the unit. If there is a refrigerant
leak, try to repair the leak. If the repair is not successful, please call
the local agent. Do not come in contact with the refrigerant leaking
from the refrigerant piping connections. It may cause frostbite.

Oil leak

Check if there is oil leaking from the compressor. If there is an oil
leak, try to repair the leak. If the repair is not successful, please call
the local agent.

Air inlet/outlet

Check for paper, cardboard or any other material that may obstruct
the air inlet and outlet of the equipment.

25

Add additional refrigerant

The amount of refrigerant to be added to this unit should be marked
on the "Confirmation Table” which is placed at electrical control box
front cover.

Installation date and field settings

Make sure the installation date is recorded on the label of the
electric control box cover, and the field settings are recorded as
well.

7.4 About Test Run

The following procedures describe the test run of the whole system. This
operation checks and determines the following items:

▪ Check if there is a wiring error (with the communication check of the indoor unit).
▪ Check if the stop valve is open.
▪ Determine the length of the pipe.

Information

i

▪ Before you start the compressor, it may take 10 minutes to achieve

a uniform cooling state.

▪ During the test run, the sound of the cooling mode in operation or

the solenoid valve may become louder, and there may be changes
in the displayed indicators. This is not a malfunction.

7.5 Test Run Implementation

1 Make sure all the settings you need to configure are completed. See section

6.2 on the implementation of the field settings.

2 Turn on the power supply of the outdoor unit and the indoor units.

Information

i

Make sure the power supply is turned on 12 hours before
operations so that the crankcase heater is properly
energized. This is also to protect the compressor.

7.6 Rectifications after Test Run is Completed with Exceptions

The test run is considered complete when there is no error code on the user
interface or the outdoor unit display. When an error code is displayed,
rectify the operation based on the description in the error code table. Try to
conduct the test run again to check that the exception has been corrected.

Information

i

Refer to the installation manual of the indoor unit for details on other
error codes related to the indoor unit.

8.2 Safety Precautions for Maintenance

Note

Before you carry out any maintenance or repair work, touch
the metal parts of the unit to dissipate static electricity and
protect the PCB.

8.2.1 Prevent electrical hazards

When maintaining and repairing the inverter:

1 Do not open the cover of the electrical component box within 5

minutes after the power is switched off.

2 Verify that the power supply is switched off before you use the

measuring instrument to measure the voltage between the main
capacitor and the main terminal ensure that the capacitor voltage
in the main circuit is less than 36 VDC. the position of main terminal
have be shown in the Wiring nameplate.

3 Before you come in any contact with the circuit board or

components (including the terminals), make sure that static
electricity in your own body is eliminated. You can touch the sheet
metal of the outdoor unit to achieve this. If conditions permit,
please wear anti-static bracelet.

4 During maintenance, pull out the plug connecting to the power cord

of the fan to prevent the fan from rotating when it is windy outside.
The strong winds will cause the fan to rotate and generate
electricity which can charge the capacitor or terminals, leading to
an electric shock. At the same time, do take note of any
mechanical damage. The blades of a high speed rotating fan are
very dangerous and cannot be operated by one person alone.

5 Once the maintenance is completed, remember to reconnect the

plug to the terminal; otherwise, a fault will be reported for the main
control board.

6. When the unit is power on, the fan of the unit with auto
snow-blowing function will run periodically, so make sure the
power supply is off before touching the unit.

Please refer to the wiring schematic on the back of the box cover of
the electrical component box for the relevant details.

7.7 Operating this Unit

Once the installation of this unit is completed, and the test run of the outdoor
and indoor units is done, you can start to run the system.
The indoor unit user interface should be connected to facilitate the
operations of the indoor unit. Please refer to the installation manual of the
indoor unit for more details.

8 Maintenance and Repair

Information

i

Arrange for the installation personnel or service agent to
carry out one maintenance every year.

8.1 Overview

This chapter contains the following information:

▪ Take electrical hazards preventive measures during system

maintenance and repair.

▪ Recovery operation for refrigerant

26

9 Error Codes

Error
code

E0

E1

E2

E4

E5

E6

E7

E8

xE9

xF1

F3

F5

F6

xH0

H2

H3

xH4

H5

H6

H7

H8

H9

yHd

C7

P1

P2

xP3

P4

P5

xP9

xPL

PP

xL0

xL1

xL2

xL4

xL5

xL7

xL8

xL9

The troubleshooting for each error code, please refer to the service manual.

Communication error between outdoor units

Phase sequence error

Communication error between indoor and
master unit
T3/T4 Temp. sensor error

Abnormal power supply voltage

Reserved

Discharge Temp. sensor error

Outdoor unit address error

EEPROM mismatch of compressor

DC bus voltage error

T6B Temp. sensor error

T6A Temp. sensor error

Electronic expansion valve connection error

Communication error between main board
and compressor drive board

Qty. of outdoor unit decreases error

Qty. of outdoor unit increases error

Inverter-module protection

3 times of P2 protection in 60 minutes

3 times of P4 protection in 100 minutes

Qty. of indoor units mismatching

High pressure sensor error

10 times of P9 protection in 120 minutes

Slave unit malfunction(y=1,2 . e.g ,1Hd
stands for slave unit 1 error)

3 times of PL protection in 100 minutes

High pressure protection or discharge
Temp. switch protection

Low pressure protection

Compressor current protection

Discharge Temp. protection

High Temp. protection of condenser

Fan module protection

Inverter module Temp. protection

Compressor discharge insufficient superheat
protection
Inverter compressor module error

DC bus low voltage protection

DC bus high voltage protection

MCE error

Zero speed protection

Phase sequence protection

Compressor frequency variation greater than
15Hz within one second protection

Actual compressor frequency differs from target
frequency by more than 15Hz protection

Error description

Only displayed on the slave unit with the error

Only displayed on the master unit with the error

Reserved

Only displayed on the master unit with the error

Only displayed on the master unit with the error

Only displayed on the master unit with the error

Only displayed on the master unit with the error

Remarks

10 Disposal

The dismantling of the unit, and treatment of the refrigerant, lubricating oil and other components must be carried out in accordance
with the applicable law.

27

11 Technical Data

11.1 Dimensions

Unit: mm

8~12 HP

1635

18~22 HP

1635

1340

790

1635

990

14~16 HP

1340

825

24~32 HP

1830

1730

850

850

28

11.2 Maintenance Space: Outdoor Unit

Make sure there is sufficient space around the unit for maintenance work,
and the minimum space for air inlet and air outlet is reserved (see below
to select a feasible method).

Note

▪ Ensure enough space for maintenance. The units in the same

system must be at the same height.

▪ Outdoor units must be spaced such that sufficient air may flow

through each unit. Sufficient airflow across heat exchangers is
essential for outdoor units to function properly.

(Air-out)

(Air-in)

(Air-out)

If the particular circumstances of an installation require a unit to be
placed closer to a wall. Depending on the height of adjacent walls
relative to the height of the units, ducting may be required to ensure
proper air discharge. In the situation depicted , the vertical section of
ducting should be at least H-h high. If the outdoor unit needs ducting
and the static pressure is more than 20Pa, the units should be
customized for the corresponding static pressure.

h-H

H

h

(Air-in)

For single row installation

>1m

>1m

Front Front

>1m

200-500mm

For multi-row installation

>1m>1m

>1m

Front Front

Front Front

>1m

(Air-in)

(Air-in)

>800mm

>800mm

Front Front

>1m

200-500mm

If obstacles are around the outdoor unit, they must be 800mm
below the top of the outdoor unit. Otherwise, an mechanical
exhaust device must be added.

A

B

Front view

(one outdoor unit)

>45°

A

D

C

Side view

(one outdoor unit)

>300 mm

B

A

B B

Front view

(two outdoor units

combined)

>1000 mm

C

A

(three outdoor

units combined)

D

Front view

Airflow deflector

29

11.3 Component Layout and Refrigerant Circuits

8-12HP

11

10

S

E

C

6

4

5

XX°C

T4

3

2

1

SV8A

17

9

SV4

9

56

7

8

9

12

13

7

14

XX°C

T3

15

13

SV6

9

SV5

EXVA

8

9

T6B

15

T6A

8

EXVC

16 12

SVC

16

9

14

Legend:

1. Compressor

2. Temperature sensor for discharge gas

3. High pressure switch

4. Pressure sensor

5. Oil separator

6. Four-way valve

7. Heat exchanger

8. Electronic Expansion Valve

9. Solenoid valve

10. Motor

11. Fan Blade

12. Stop valve (liquid side)

13. Stop valve (gas side)

14. Detection needle valve

15. Plate heat exchanger

16. Gas-liquid separator

17. Low pressure switch

T3 Condenser temperature sensor
T4 Outdoor temperature sensor
T6A Temperature sensor at plate heat exchanger
inlet
T6B Temperature sensor at plate heat exchanger
outlet
SV4 Fast oil return value
SV5 Low pressure bypass value
SV6 Liquid bypass value
SV7 Pressure value
SV8 Injection valve value
SVC Refrigerant charging valve (customization
option)

10

3

4 2

11

17

1

30

14-16HP

4

3

2

SV8A

7

8

9

13

11

Legend:

10

S

E

C

6

XX°C

T4

XX°C

7

T3

SV5

9

T6B

8

EXVA

8

EXVB

5

15

T6A

8

EXVC

1

17

9

SV4

SV7

9

16

9

SVC

9

5

6

16

1. Compressor

2. Temperature sensor for discharge gas

SV6

3. High pressure switch

9

4. Pressure sensor

5. Oil separator

6. Four-way valve

7. Heat exchanger

8. Electronic Expansion Valve

9. Solenoid valve

10. Motor

11. Fan Blade

12. Stop valve (liquid side)

13. Stop valve (gas side)

12

14. Detection needle valve

15. Plate heat exchanger

16. Gas-liquid separator

17. Low pressure s witch

14

T3 Condenser temperature sensor
T4 Outdoor temperature sensor
T6A Temperature sensor at plate heat exchanger
inlet
T6B Temperature sensor at plate heat exchanger
outlet
SV4 Fast oil return value
SV5 Low pressure bypass
SV6 Liquid bypass value
SV7 Pressure value
SV8 Injection valve
SVC Refrigerant charging valve (customization
option)

10

12

13

14

15

11

17

4

3

2

1

31

18-22HP

4
3

2

1

SV8A

9

7

8

9

13

11

S

E

C

6

XX°C

T4

5

2

1

SV8B

9

6

12

13

11

10 10

XX°C

7

T3

SV4

17

9

SV9

9 9

14

15

16

SV5

165

9

T6B

15

T6A

8

EXVC

Legend:

1. Compressor

14

SV6

2. Temperature sensor for discharge gas

9

3. High pressure switch

4. Pressure sensor

5. Oil separator

6. Four-way valve

7. Heat exchanger

8. Electronic Expansion Valve

9. Solenoid valve

10. Motor

12

11. Fan Blade

12. Stop valve (liquid side)

13. Stop valve (gas side)

14. Detection needle valve

15. Plate heat exchanger

16. Gas-liquid separator

17. Low pressure switch

T3 Condenser temperature sensor
T4 Outdoor temperature sensor
T6A Temperature sensor at plate heat exchanger
inlet
T6B Temperature sensor at plate heat exchanger
outlet
SV4 Fast oil return value
SV5 Low Pressure bypass
SV6 Liquid bypass value
SV7 Pressure bypassvalue
SV8A Injection valve A
SV8B Injection valve B
SV9 Pressure unloading valve
SVC Refrigerant charging valve (customization
option)

8

EXVA

SVC

EXVB

8

10

11

17

4

2

3

1

32

7

8

9

10

24-28HP

4

3

2

1

SV8A

9

11

E

S

C

6

5

2

1

SV8B

9

5

6

9

12

13

14

XX°C

T4

11

10

7

SV4

9

4

15

17

XX°C

T3

SV9

10

16

Legend:

15

8

EXVA

SVC

9

8

EXVB

14

SV6

9

1. Compressor

2. Temperature sensor for discharge gas

3. High pressure switch

4. Pressure sensor

5. Oil separator

6. Four-way valve

7. Heat exchanger

12

8. Electronic Expansion Valve

9. Solenoid valve

10. Motor

11. Fan Blade

12. Stop valve (liquid side)

13. Stop valve (gas side)

14. Detection needle valve

15. Plate heat exchanger

16. Gas-liquid separator

17. Low pressure switch

T3 Condenser temperature sensor
T4 Outdoor temperature sensor
T6A Temperature sensor at plate heat
exchanger inlet
T6B Temperature sensor at plate heat
exchanger outlet
SV4 Fast oil returnvalue
SV5 Low pressure bypass
SV6 Liquid bypass value
SV7 Pressure value
SV8A Injection valve A
SV8B Injection valve B
SV9 Pressure unloading valve
SVC Refrigerant charging valve (customization
option)

SV5

9

T6B

T6A

8

EXVC

16

9

16

11

13

3 2

17

1

33

30-32HP

11

S

E

C

6

4

5

3

2

2

SV8A

1

9

SV8B

6

1

9

5

XX

T4

11

10

7

°C

XX

T3

10

°C

T6B

8

EXVA

SV5

9

15

T6A

8

EXVC

SV4

SV7

17

16

SV9

99

4

16

9

SVC

16

7

8

9

13

14

15

12

13

Legend:

1. Compressor

8

SV6

9

EXVB

9

14

2. Temperature sensor for discharge gas

3. High pressure switch

4. Pressure sensor

5. Oil separator

6. Four-way valve

7. Heat exchanger

8. Electronic Expansion Valve

9. Solenoid valve

12

10. Motor

11. Fan Blade

12. Stop valve (liquid side)

13. Stop valve (gas side)

14. Detection needle valve

15. Plate heat exchanger

16. Gas-liquid separator

17. Low pressure switch

T3 Condenser temperature sensor
T4 Outdoor temperature sensor
T6A Temperature sensor at plate heat
exchanger inlet
T6B Temperature sensor at plate heat
exchanger outlet
SV4 Fast oil return value
SV5 Low pressure bypass
SV6 Liquid bypass value
SV7 Pressure value
SV8A Injection valve A
SV8B Injection valve B
SV9 Pressure unloading valve
SVC Refrigerant charging valve (customization
option)

10

11

17

3

2

1

34

11.4 Fan Performance

11.5 Outdoor Unit Ducting

The default external static pressure of outdoor units’ air outlets is zero.
With the steel mesh cover removed the external static pressure is 20Pa.

8-12HP units fan performance

20

15

10

5

Static pressure (Pa)

0

9800 10000 10200 10400 10600 10800 11000 11200

Air flow (m3/h)

14-16HP units fan performance

20

15

10

5

Static pressure (Pa)

0

12000 12200 12400 12600 12800 13000 13200

Air flow (m3/h)

Ducting for 8-12HP

Option A – Transverse ducting

750

90

100

Air outlet louver

8 ST3.9

self-threading screws

Support

A

B

C

D

E

θ

C

Radius

B

A≥300
B≥250

C≤3000

D≥731

E=A+731

≤15°

θ

A

731

Radius

E

20

15

10

5

Static pressure (Pa)

0

15800 16000 16200 16400 16600 16800 17000 17200

Air flow (m3/h)

24-28HP units fan performance

18-22HP units fan performance

20

15

10

5

Static pressure (Pa)

0

23600 23800 24000 24200 24400 24600 24800 25000 25200

Air flow (m3/h)

30-32HP units fan performance

20

Remove the
steel mesh first

Option B – Longitudinal ducting

Support

D

90

100

Air outlet louver

704

C

Radius E

A

Radius

B

self-threading screws

750

8 × ST3.9

15

10

5

Static pressure (Pa)

0

22600 22800 23000 23200 23400 23600 23800 24000 24200

Air flow (m

3

/h)

Remove the

steel mesh first

35

A

B

C

D

E

θ

Static pressure

Above 20 Pa

0 Pa

0-20 Pa

A≥300
B≥250

C≤3000

D≥750

E=A+750

≤15°

θ

Remark

Factory default
Remove steel mesh and connect to

duct < 3m long
Customization option

Ducting for 14-16HP

Option A – Transverse ducting

800

D

90

Support

Option B – Longitudinal ducting

Support

C

D

Radius E

A

Radius

90

B

1290

100

Air outlet louver

740

Radius

C

E

8 × ST3.9

self-threading screws

A

Radius

B

770

Remove the

steel mesh first

8 × ST3.9

self-threading screws

A

B

C

D

E

θ

A≥300
B≥250

C≤3000

D≥770

E=A+770

≤15°

θ

100

Air outlet louver

Remove the

steel mesh first

θ

A

B

C

D

E

θ

Static pressure

0 Pa

0-20 Pa

Above 20 Pa

A≥300
B≥250

C≤3000

D≥1290

E=A+1290

≤15°

θ

Remark

Factory default
Remove steel mesh and connect to

duct < 3m long
Customization option

36

Ducting for 18-22HP

Option A – Transverse ducting

1290

D

90

100

Air outlet louver

Support

θ

A

B

C

C

E

Radius

A

Radius

630

B

D

E

θ

Static pressure

Above 20 Pa

0 Pa

0-20 Pa

A≥300
B≥250

C≤3000

D≥1290

E=A+1290

≤15°

θ

Remark

Factory default
Remove steel mesh and connect to

duct < 3m long
Customization option

12 × ST3.9

self-threading screws

Option B – Longitudinal ducting

D

90

100

Remove the

steel meshes first

Support

Ducting for 24-32HP

Transverse ducting only

90

Support

C

Radius

E

A

Radius

740

B

θ

A

B

C

D

E

θ

A≥300
B≥250

C≤3000

D≥630

E=A+630

≤15°

θ

1653

D

100

Air outlet louver

C

Radius E

12 × ST3.9

self-threading screws

A

Radius

B

1290

Remove the

steel meshes first

Air outlet louver

630

12 × ST3.9

self-threading screws

Remove the

steel meshes first

A

B

C

D

E

θ

A≥300
B≥250

C≤3000

D≥740

E=A+740

θ

Static pressure

0 Pa

0-20 Pa

Above 20 Pa

≤15°

Remark

Factory default
Remove steel mesh and connect to

duct < 3m long
Customization option

37

16127000001886 V.H

版本更换明细（本页不出菲林，仅作为电子文档说明）

双胶纸黑白印
100g
A4

E:
更改S13拨码 21页
G:
1、增加分歧管参数表4.6
2、Table 4.2 CC Assembly改为Outdoor Unit Branch Joint Assembly
H

说明书第10页表4-10 Cable for fixed wiring中and更改为to