Gree GMV-WQ72WM/A-F User manual

Owner's Manual
Original Instructions
Commercial Air Conditioners
Water-cooled Heat Recovery DCInverter VRF
Models:
Single unit:
GMV-WQ72WM/A-F(U)
GMV-WQ96WM/A-F(U)
GMV-WQ120WM/A-F(U)

Preface
(1) Instructions for installation and use of this product are provided by the manufacturer.
(2) Installation should be performed in accordance with the requirements of NEC and CEC by authorized
personnel only.
(3) For safety operation, please strictly follow the instructions in this manual.
(4)
During operation, the gross rated capacity of working IDU should be within the gross rated capacity of ODU.
Otherwise, IDU’s cooling/heating performance will be reduced.
(5) This manual should be in the hands of direct operators or maintenance men.
(6)
In case of malfunction and operation failure, please examine the following items and contact our authorized
service centers as soon as possible.
1) Nameplate (model, cooling capacity, product code, ex-factory date).
2) Malfunction status (detail description of conditions before and after malfunction occurs).
(7) All units have been strictly tested and proved to be qualified before ex-factory. To avoid unit damage or
even operation failure which may be caused by improper disassembly, please do not disassemble units by
yourself. If disassembly is needed, please contact our authorized serve centers for help.
(8) All graphics and information in this manual are only for reference. Manufacturer reserves the right for
changes in terms of sales or production at any time and without prior notice.
(9) If the supply cord is damaged, it should be replaced by the manufacturer, its service agent or similarly
qualified persons in order to avoid a hazard.
User Notice
This appliance can be used by children aged from 8 years and above and persons with reduced
physical, sensory or mental capabilities or lack of experience and knowledge if they have been given
supervision or instruction concerning use of the appliance in a safe way and understand the hazards
involved. Children shall not play with the appliance. Cleaning and user maintenance shall not be
made by children without supervision.
DISPOSAL: Do not dispose this product as unsorted municipal waste. Collection of
such waste separately for special treatment is necessary.
Exception Clauses
Manufacturer will bear no responsibilities when personal injury or property loss is caused by the following reasons:
(1) Damage the product due to improper use or misuse of the product.
(2) Alter, change, maintain or use the product with other equipment without abiding by the instruction manual of
manufacturer.
(3) After verification, the defect of product is directly caused by corrosive gas.
(4) After verification, defects are due to improper operation during transportation of product.
(5) Operate, repair, maintain the unit without abiding by instruction manual or related regulations.
(6) After verification, the problem or dispute is caused by the quality specification or performance of parts and
components that produced by other manufacturers.
(7) The damage is caused by natural calamities, bad using environment or force majeure.

Contents
1 Safety Notices (Please be sure to abide them) ....................................................... 1
2 Product Introductions ............................................................................................... 2
2.1 Names of Main Parts...........................................................................................................2
2.2 Combinations of Indoor and Outdoor Units .........................................................................2
2.3 The Range of Production Working Temperature .................................................................3
3 Preparations before Installation ............................................................................... 4
3.1 Standard Parts.....................................................................................................................4
3.2 Installation Site....................................................................................................................4
4 Installation Instructions ............................................................................................ 6
4.1 External Dimensions and Mounting Holes Dimension of ODU............................................6
4.2 Connection Pipe..................................................................................................................7
4.3 Installation of the Connection Pipe....................................................................................13
4.4 Vacuum and Refrigerant Charge.......................................................................................16
4.5 Electric Wiring....................................................................................................................19
4.6 System Communication.....................................................................................................22
4.7 Connection Method and Steps for System Communication..............................................27
4.8 External Electrical Wiring Diagram....................................................................................30
4.9 Water System Design........................................................................................................32
5 Check Items after Installation and Trial Run.......................................................... 36
5.1 Check Items after Installation ............................................................................................36
5.2 Trial Run............................................................................................................................36
6 Common Malfunction and Troubleshooting.......................................................... 48
7 Error Indication........................................................................................................ 49
8 Maintenance and Care............................................................................................. 53
8.1 Outdoor Heat Exchanger...................................................................................................53
8.2 Drain Pipe..........................................................................................................................54
8.4 Maintenance after Seasonal Use ......................................................................................54
8.5 Parts Replacement............................................................................................................54
9 After-sales Service................................................................................................... 54

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1 Safety Notices (Please be sure to abide them)
If not abide them strictly, it may cause severe damage to
the unit or the
people.
If not abide them strictly, it may cause slight or medium damage to the unit or
the people.
This sign indicates that the items must be prohibited. Improper operation may
cause severe damage or death to people.
This sign indicates that the items must be observed. Improper operation may
cause damage to people or property.
(1) This product can’t be installed at corrosive, inflammable or explosive environment or the place with special
requirements, such as kitchen. Otherwise, it will affect the normal operation or shorten the service life of the
unit, or even cause fire hazard or serious injury. As for the above special places, please adopt special air
conditioner with anti-corrosive or anti-explosion function.
(2) Follow this manual to complete the installation work. Please read this manual carefully before turning on or
repairing the unit.
(3) Installation should be conducted by the dealer or qualified personnel. Please do not attempt to install the air
conditioner by yourself. Improper installation may lead to water leakage, electric shock or fire hazard, etc.
(4) Before installation, please check whether the power supply is complied with that specified on the nameplate
and check the safety of the power supply.
(5) The air conditioner must be grounded reliably for avoiding electric shock. Please do not connect the
earthing wire to gas pipe, water pipe, lightning rod or telephone line.
(6) Be sure to use special accessories and parts for installation to prevent water leakage, electric shock and fire
hazard, etc.
(7) If refrigerant leakage happens, please ventilate the room immediately.
(8) Diameter of power cord should be large enough. The damaged power cord and connection wire must be
replaced with special cables.
(9) When the power cord is connected, please fix the electric box cover properly to avoid safety accidents.
(10) Never fail to comply with the nitrogen-charging welding process. Do charge nitrogen when welding the
pipes.
(11) Never short circuit or cancel the pressure switch to prevent unit damage.
(12) As for the unit controlled by the wired controller, connect the wired controller well firstly and then energize
the unit; otherwise, the unit can’t operate normally.
(13) When installation is finished, please check whether the drainage pipes, pipelines and electric wires are
connected correctly to avoid water leakage, refrigerant leakage, electric shock or fire, etc.
(14) Do not insert fingers or objects into air outlet or air return grille.
(15) Open the door and window frequently to keep good ventilation for avoiding oxygen deficit when gas heater
or oil heater is used in the room.
(16) Never plug in or unplug the power plug directly to turn on or turn off the air conditioner.
(17) Once the air conditioner is turned on, it can be turned off only after it has operated for 5min at least;
otherwise, it will affect the oil return of compressor.
(18) Do not allow children to operate this air conditioner.
(19) Do not operate this air conditioner with wet hands.
(20) The air conditioner can be cleaned only when it has been turned off and the power has been cut off;
otherwise, it may cause electric shock or injury.
(21) Never spray or flush water towards the air conditioner; otherwise, malfunction or electric shock may happen.
(22) Do not expose the air conditioner to the moist or corrosive environment.
(23) Put through the power 8 hours in advance before operation. Do not cut off the power when the air
conditioner stops operation for only about one night (protect the compressor).

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(24) Volatile liquid, such as diluent or gasoline, will damage the appearance of air conditioner. Only soft dry cloth
and wet cloth dipped with neutral detergent can be used to clean the outer case of air conditioner.
(25) Under cooling mode, please don't set the room temperature too low; keep the temperature difference
between indoor and outdoor within 5℃(41℉).
(26) If there are any abnormal circumstances (such as burning smell, etc.), please turn off the unit and cut off the
main power supply immediately, and then contact Gree appointed service center. If those abnormal
circumstances still exit, the unit may be damaged and it may lead to electric shock or fire hazard.
(27) Do not repair the unit by yourself. Wrong maintenance may cause electric shock or fire hazard. Please
contact Gree appointed service center for help.
2 Product Introductions
Gree Water-cooled Multi VRF System adopts inverter compressor technology. According to
change the displacement of compressor, stepless capacity regulation within range of 10%-100% can
be realized. Various product line up is provided with capacity range from 72kBtu/h to 120kBtu/h,
which can be widely used in working area and especially applicable to the place with variable load
change. Gree air conditioner is absolutely your best choice.
2.1 Names of Main Parts
Fig.2.1
2.2 Combinations of Indoor and Outdoor Units
ODU Model Max quantity of connectable IDU
GMV-WQ72WM/A-F(U) 13
GMV-WQ96WM/A-F(U) 16
GMV-WQ120WM/A-F(U) 19
The total capacity of indoor units should be within 50%~135% of that of outdoor units.

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Fig.2.2
Fig.2.2 is the combination graph of Water-cooled Multi VRF System ODU and Multi VRF System
IDU. IDU can be cassette type, one-way cassette type, wall-mounted type, duct type, etc. When any
one IDU receives operation signal, ODU will start to work according to the capacity; when all IDUs
stop, ODU will also stop.
2.3 The Range of Production Working Temperature
- Water Temperature Water Max. Pressure
Cooling operation 10℃(50℉)~50℃(122℉) 1.96MPa
Heating operation 10℃(50℉)~50℃(122℉) 1.96MPa
Heat recovery operation 10℃(50℉)~45℃(113℉) 1.96MPa
Beyond the working Temperature Range may damage this product and will
invalidate the warranty.

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3 Preparations before Installation
The product pictures are provided for reference only and the detail should refer to
actual product. The unit is mm unless otherwise specified.
3.1 Standard Parts
Please apply the following provided standard parts according to requirements.
Parts for Outdoor Unit
Number Name Picture Quantity Remarks
1 Owner's Manual 1 -
2 Wiring (match with
resistance) 1 Connected to the last IDU of
communication connection
3 Water filter 1 Connected to water pipe
4 Pipe connectors 3 Connected to stop valves of ODU
3.2 Installation Site
Forbidden item! Improper operation might lead to personal injury or even death.
Item needs to be followed. Improper operation might lead to personal injury or property
damage.
Select a position that can
bear the unit’s weight for
installation and fixing,
prevent the unit from
shaking or falling off. For
avoid accident from water,
the installation site should
be inside the house.
Ensure a certain space for
ODU and maintenance so
that the unit can operate
reliably.
Try to keep the unit away
from combustible,
inflammable and corrosive
gas or exhaust gas.
Never allow children to
approach to the unit and
prevent children from
touching the unit.
When the outdoor unit is surrounded by walls all round, please refer to following graphs for space
requirement.

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3.2.1 Space requirement for single-module unit
For easy maintenance, at least one of the left side and right side of ODU should be over 500 mm
away from the barrier so that maintenance person can access the rear part of the unit.
Unit:mm(in.)
Fig.3.1
3.3 Piping Work Requirements
Requirements.
R410A Refrigerant System
Outer diameter mm(in.)
Wall thickness mm(in.)
Type
Φ6.35(1/4)
≥0.8(1/32)
O
Φ9.52(3/8)
≥0.8(1/32)
O
Φ12.70(1/2)
≥0.8(1/32)
O
Φ15.9(5/8)
≥1.0(3/76)
O
Φ19.05(3/4)
≥1.0(3/76)
1/2H
Φ22.2(7/8)
≥1.2(1/21)
1/2H
Φ28.60(1-1/8)
≥1.2(1/21)
1/2H
Φ34.90(1-3/8)
≥1.3(2/39)
1/2H
Φ41.30(1-5/8) ≥1.5(1/17) 1/2H
Φ44.5(1-3/4)
≥1.5(1/17)
1/2H

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4 Installation Instructions
4.1 External Dimensions and Mounting Holes Dimension of ODU
Outline and External Dimensions of GMV-WQ72WM/A-F(U), GMV-WQ96WM/A-F(U), and
GMV-WQ120WM/A-F(U) unit.
Unit:mm(in.)
Fig.4.1.1

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4.2 Connection Pipe
4.2.1 Schematic Diagram of Piping Connection
Fig.4.2.1
4.2.2 Schematic Diagram of Piping Sequence
GMV-WQ72WM/A-F(U), GMV-WQ96WM/A-F(U) and GMV-WQ120WM/A-F(U) unit.
Fig.4.2.2

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4.2.3 Allowable pipe length and dropping height among indoor and outdoor units
Y type branch joint is adopted to connect indoor and outdoor units. Connecting method is shown
as the figure below.
Remark: Equivalent length of one Y-type manifold is about 0.5m (1-3/4ft.).
Fig.4.2.3
H：Height difference between indoor unit and outdoor unit.
L12: Length from the first branch to the farthest IDU.
L11: Length from the first branch to the nearest IDU.
Equivalent length of branch of IDU is 0.5m (1-3/4ft.).
Equivalent length of mode exchanger depends on the using situation, for example, when using
one branch, the length is 1m(39-3/8in.), when using N branches, the length is N meters.
R410A Refrigerant System Allowable Value m(ft.) Fitting Pipe
Total length (actual length) of fitting pipe ≤300(984-1/4) L1+L2+L3+L4+…+L10+A11+A12+…+D
21+D22
Length of farthest
fitting pipe m(ft.) Actual length ≤165(541-5/16) L
Equivalent length ≤190(623-3/8) -
Difference between the pipe length from the first
branch of IDU to the farthest IDU and the pipe
l
ength from the first branch of IDU to the nearest
IDU
≤40(131-1/4) L12-L11
Equivalent length from the first branch to the
furthest piping (1) ≤40(131-1/4) L7+L8+L10+D22
Height difference
between outdoor unit
and indoor unit
Outdoor unit at upper(2) ≤50(164-1/16) -
Outdoor unit at lower(2) ≤50(164-1/16) -
Height difference between indoor units ≤30(98-7/16) h1
Maximum length of Main pipe(3) ＜90(295-1/4) L1
From IDU to its nearest branch (4) ≤40(131-1/4) A11,A12,B21,B22,D21,D22

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①Generally, the pipe length from the first branch of IDU to the farthest IDU is 40m(131-1/4ft.).
Under the following conditions, the length can reach 90m (295-1/4ft.).
Actual length of pipe in total:
1) L1+L2 ×2+L3 ×2+L4 ×2+…+L10 ×2+A11+A12+…+D21+D22≤300m (984-1/4ft.).
2) Length between each IDU and its nearest branch A11, A12, B21, B22, D21,
D22≤40m(131-1/4ft.).
3) Difference between the pipe length from the first branch of IDU to the farthest IDU and
the pipe length from the first branch of IDU to the nearest IDU: L12-L11≤40m(131-1/4ft.).
②When the maximum length of the main pipe from ODU to the first branch of IDU
is≥80m(262-7/16ft.), then adjust the pipe size of the gas pipe and liquid pipe of main pipe
according to the following table.
Outdoor Model Size of connection between outdoor unit and the first indoor branch
Low pressure gas pipe
mm(in.)
Liquid pipe
mm(in.)
High pressure gas pipe
mm(in.)
GMV-WQ72WM/A-F(U) No change No change No change
GMV-WQ96WM/A-F(U) No change Ф12.7(1/2) Φ22.2(7/8)
GMV-WQ120WM/A-F(U) No change Ф15.9(5/8) Φ28.6(1-1/8)
③If the length between an IDU and its nearest branch is above 10m (32-8/10ft.), then increase
the size of the liquid pipe of IDU (only for the pipe size which is≤6.35mm (1/4in.).
4.2.5 Size of piping (main pipe) from ODU to the first indoor branch
4.2.5.1 Connection sketch map of single-module system
If the system is a single module system, the size of piping from ODU to the first indoor branch
should be selected according to the connecting pipe outer diameter of ODU.
Fig.4.2.4

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4.2.5.2 For single ODU system, select appropriate pipe between ODU and the first indoor branch (“L”)
according to the pipe size specification of ODU. Pipe size of basic outdoor module is shown as below:
Between ODU and the first indoor branch.
Basic module
Pipe between ODU and the first indoor branch
Low pressure gas pipe
mm(in.)
Liquid pipe
mm(in.)
High pressure gas pipe
mm(in.)
GMV-WQ72WM/A-F(U) Φ19.05(3/4) Φ9.52(3/8) Φ15.9(5/8)
GMV-WQ96WM/A-F(U) Φ22.2(7/8) Φ9.52(3/8) Φ19.05(3/4)
GMV-WQ120WM/A-F(U) Φ28.6(1-1/8) Φ12.7(1/2) Φ22.2(7/8)
4.2.5.3 Size of connection pipe “M4” between branches of basic module
Size of connection pipe between branches of basic module is determined by the total rated
capacity of upstream modules.
Connection pipe “M4” between branches of outdoor module.
Total rated capacity of
upstream modules:
Q (Btu/h)
Size of connection pipe between branches of outdoor module
Low pressure gas pipe
mm(in.)
Liquid pipe
mm(in.)
High pressure gas pipe
mm(in.)
Q≤72000 Φ19.05(3/4) Φ9.52(3/8) Φ15.9(5/8)
72000＜Q≤96000 Φ22.2(7/8) Φ9.52(3/8) Φ19.05(3/4)
96000＜Q≤120000 Φ28.6(1-1/8) Φ12.7(1/2) Φ22.2(7/8)
4.2.5.4 Size of connection pipe “L” between the terminal outdoor branch and the first indoor branch
Connection pipe “L” between outdoor unit and the first indoor branch.
Module Size of connection between outdoor unit and the first indoor branch
Low pressure gas pipe
mm(in.)
Liquid pipe
mm(in.)
High pressure gas pipe
mm(in.)
GMV-WQ72WM/A-F(U) Φ19.05(3/4) Φ9.52(3/8) Φ15.9(5/8)
GMV-WQ96WM/A-F(U) Φ22.2(7/8) Φ9.52(3/8) Φ19.05(3/4)
GMV-WQ120WM/A-F(U) Φ28.6(1-1/8) Φ12.7(1/2) Φ22.2(7/8)
4.2.5.5 Branch selection of mode exchanger (“A1, A2”)
Select branch of mode exchanger according to each total capacity of downstream indoor unit.
Please refer to the following table.
Model selection for branch “A1 / A2” of mode exchanger.
R410A refrigerant system Total Capacity of the Downstream Indoor Unit X(Btu/h) Model
Y-Type Branch Pipe
X≤17100 FQ01Na/A
17100＜X≤72000 FQ02Na/A
72000＜X≤96000 FQ03Na/A
96000＜X≤232000 FQ04Na/A

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4.2.5.6 Piping size among upstream branches of mode exchanger (“n1/n2/n3/n4”)
Total rated capacity of
downstream indoor units:
C(Btu/h)
Size of connection pipe between branches of mode exchanger
Low pressure gas pipe
mm(in.)
Liquid pipe
mm(in.)
High pressure gas pipe
mm(in.)
Q≤17100 Φ12.7(1/2) Φ6.35(1/4) Φ12.7(1/2)
17100＜Q≤48500 Φ15.9(5/8) Φ9.52(3/8) Φ12.7(1/2)
48500＜Q≤72000 Φ19.05(3/4) Φ9.52(3/8) Φ15.9(5/8)
72000＜Q≤96000 Φ22.2(7/8) Φ9.52(3/8) Φ19.05(3/4)
96000＜Q≤120000 Φ28.6(1-1/8) Φ12.7(1/2) Φ22.2(7/8)
120000＜Q≤144000 Φ28.6(1-1/8) Φ12.7(1/2) Φ22.2(7/8)
144000＜Q≤168000 Φ28.6(1-1/8) Φ15.9(5/8) Φ22.2(7/8)
4.2.5.7 Piping size among downstream branches of mode exchanger “a / h”
Rated capacity of indoor unit
C(Btu/h) Size of piping among downstream branches of mode exchanger
Gas Pipe mm(in.) Liquid Pipe mm(in.)
C≤9500 Φ9.52(3/8) Φ6.35(1/4)
9500＜C≤17100 Φ12.7(1/2) Φ6.35(1/4)
17100＜C≤48500 Φ15.9(5/8) Φ9.52(3/8)
4.2.5.8 Branch selection of downstream indoor unit of mode exchanger (“B1/B2/B3”)
R410A refrigerant system Total rated capacity of downstream indoor
units: X(Btu/h)
Model
Y-type branch X≤48500 FQ01A/A
4.2.5.9 Piping size between mode exchanger and downstream indoor unit (“b / c / d / g”)
Rated capacity of indoor unit
C(Btu/h) Pipe between mode exchanger and IDU
Gas Pipe mm(in.) Liquid Pipe mm(in.)
C≤9500 Φ9.52(3/8) Φ6.35(1/4)
9500＜C≤17100 Φ12.7(1/2) Φ6.35(1/4)
17100＜C≤48500 Φ15.9(5/8) Φ9.52(3/8)
4.2.5.10 Piping between indoor branch and indoor unit (“e / f / i / j / k”)
Size of connection pipe between indoor branch and indoor unit should be consistent with the
connection pipe of indoor unit.
Piping between indoor branch and indoor unit “e / f / i / j / k”.
Rated capacity of indoor units:
X ((Btu/h) Size of connection pipe between indoor branch and indoor unit
Gas pipe mm(in.) Liquid pipe mm(in.)
C≤9500 Φ9.52(3/8) Φ6.35(1/4)
9500＜C≤17100 Φ12.7(1/2) Φ6.35(1/4)
17100＜C≤48500 Φ15.9(5/8) Φ9.52(3/8)

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4.2.5.11 Piping between indoor branches (“l”)
Rated capacity of the downstream
indoor units C(kW) Size of connection pipe between indoor branch
Gas pipe mm(in.) Liquid pipe mm(in.)
C≤9500 Φ9.52(3/8) Φ6.35(1/4)
9500＜C≤17100 Φ12.7(1/2) Φ6.35(1/4)
17100＜C≤48500 Φ15.9(5/8) Φ9.52(3/8)
4.2.6 Connection method cooling capacity of IDU exceeds 48500Btu/h
When the cooling capacity of connected IDU exceeds 48500Btu/h, it is prohibit connecting with
only one branch of mode exchanger; it should use two branches of the same mode exchanger
controlled for parallel connection.
Parallel connection Indoor unit Communication
connection for mode exchanger
Remarks
Indoor unit No.1 and
No.2 “1D1 1D2”
Parallel connection should be conducted only from the
combination of this table. It is prohibit connecting in
any other way. Attention that after connection, SA2 of
mainboard should be set manually, and change the
code at the first place as follow.
Indoor unit No.3 and
No.4 “3D1 3D2” -
Indoor unit No.5 and
No.6 “5D1 5D2” -
Indoor unit No.7 and
No.8 “7D1 7D2” -
Fig.4.2.5
Connecting method is as shown as below
Fig.4.2.6

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4.2.6.1 Branch selection of indoor unit of mode exchanger (“C1”)
R410A refrigerant system
capacity of down steam indoor units: X
(Btu/h)
Model
Y-type branch 48500＜X≤96000 FQ01B/A
4.2.6.2 Piping size between mode exchanger and downstream indoor unit (“m”)
Size of connection pipe between indoor branch and indoor unit should be consistent with the
connection pipe of indoor unit.
Piping between indoor branch and IDU “m”.
Rated capacity of indoor units
(Btu/h) Size of connection pipe between indoor branch and IDU
Gas pipe mm(in.) Liquid pipe mm(in.)
48500＜C≤72000 Φ19.05 (3/4) Φ9.52(3/8)
72000＜C≤96000 Φ22.2 (7/8) Φ9.52(3/8)
4.3 Installation of the Connection Pipe
Before welding the pipeline sealing cap, please make sure there’s no refrigerant in pipeline. If
welding it directly, it may cause unnecessary property damage or personal injury.
4.3.1 Precautions when installing the connection pipe
(1) Conform to the following principles during piping connection: Connection pipeline should be
as short as possible. The height difference between indoor and outdoor units should be as
short as possible. The quantity of bends should be as less as possible. The radius of
bending should be as large as possible.
(2) Weld the connection pipes between indoor and outdoor units. Please strictly conform to the
requirements for welding process. Rosin joints and pin holes are not allowable.
(3) When laying the pipes, be careful not to deform them. The radius of bending parts should be
more than 200mm (7-7/8in.). The pipes should not be repeatedly bent or extended,
otherwise the material will get harden. Do not bend or extend the pipe over three times at the
same position.
(4) Please use a torque wrench to connect union nut on the indoor unit as below.
Fig.4.3.1
1) Align the expansion end of copper pipe with the center of threaded joint. Tighten the flare
nuts with hands.

Water-cooled Heat Recovery DC Inverter VRF
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2) Tighten the flare nuts with torque wrench until hearing “click” sound.
3) Use sponge to wrap the connecting pipe and joints without thermal insulation and tie it up
with plastic tape.
4) Mounting supporter for the connection pipe is required.
5) The bending degree of connection pipe should not be small too much, otherwise the pipe
might crack. Installation personnel should use tube bender when bending the pipe.
6) Don't pull of draw the pipe joints, otherwise indoor capillary or other pipes might be
damaged and even lead to refrigerant leakage.
4.3.2 Y-type manifold
(1) Y-type manifold
Fig.4.3.2
(2) Y-type manifold has several pipe sections with different pipe size, which is convenient to
match with various copper pipes. Use pipe cutter to cut in the middle of the pipe section with
different pipe size and eliminate the burr as well. Show as Fig.4.3.3.
(3) Y-type manifold should be installed vertically or horizontally.
Fig.4.3.3
Y-type manifold Total capacity of downstream indoor
unit(s) C (Btu/h)
Model
C＜68000 FQ01A/A
68000≤C≤102000 FQ01B/A
102000＜C≤239000 FQ02/A
239000＜C FQ03/A
(4) Manifold is thermal insulation by applying material which can sustain 120℃(248℉) or
above. Manifold attached foam should not be applied as thermal insulator.

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4.3.3 Thermal insulation for pipeline
(1) For multi VRF system, every copper pipe should be labeled to avoid misconnection.
(2) Requirement for manifolds is as follow:
The length of a straight pipe between two manifolds should not be less than 500 mm
(19-11/16in.). The length of a straight pipe before the main pipe port of the manifold should not be
less than 500mm (19-11/16in.). The length of a straight pipe between the branch of the manifold and
the IDU should not be less than 500mm (19-11/16in.). Show as Fig.4.3.4.
Unit:mm (in.)
Fig.4.3.4
(3) Three fixing point for both horizontal and vertical installation of the Y-type manifold should
be applied. Show as Fig.4.3.5.
Fixing point 1: 100 mm (3.94in.) on the main inlet manifold from the welding point.
Fixing point 2: 200 mm (7.88in.) on the main branched pipe from the welding point.
Fixing point 3: 250 mm (9.84 in.) on the branched pipe from the welding point.
Unit: mm (in.)
Fig.4.3.5
(4) Thermal insulation for pipeline.
1) To avoid condensate or water leakage from connecting pipe, gas pipe and liquid pipe
should be wrapped with thermal insulator and adhesive pipe for insulation from the air.
2) For heat pump unit, thermal insulator for liquid pipe should sustain 70℃(158℉) or above,
and for gas pipe should sustain 120℃(248℉) or above. For cooling only unit, thermal
insulator for both liquid pipe and gas pipe can sustain 70℃(158℉) or above. Example:

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Polyethylene foam can sustain 120℃(248℉) or above and foaming polyethylene can
sustain 100℃(212℉) or above.
3) Joints at indoor and outdoor units should be wrapped with thermal insulator and no
clearance between pipe and wall. Show as Fig.4.3.6.
Fig.4.3.6
4) Manifold attached foam cannot be taken as insulating material.
5) When wrapping the tape, the later circle should cover half of the former one. Don’t wrap
the tape too tight, otherwise the insulation degrades.
6) After wrapping the pipe, adopt sealing material to completely fill the hole to prevent wind
and rain entering the room.
4.3.4 Support and protection for pipeline
(1) Support should be made for hanging connection pipe. Distance between each support
cannot be over 1m (39-3/8in.).
(2) Protection towards accidental damage should be made for outdoor pipeline. If the pipe
exceeds 1m (39-3/8in.), a pin board should be adopted for protection.
4.4 Vacuum and Refrigerant Charge
4.4.1 Vacuum
(1) Before vacuum, make sure that outdoor liquid pipe/low pressure gas pipe/high pressure gas
pipe valves are all closed. Apply vacuum pumps to pump out air from IDUs and connection
pipe through the fluorine injection nozzles at the outdoor liquid pipe/low pressure gas
pipe/high pressure gas pipe valves of ODU. Connection graph is shown as Fig.4.4.1 and
Fig.4.4.2.
(2) Vacuum connection method for more than 2 ODUs is the same.
High pressure
Gas Pipe Low pressure
Gas Pipe Low pressure
Check Valve
Liquid Pipe
Fig.4.4.1

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Fig.4.4.2
4.4.2 Additional refrigerant charging
Outdoor unit has been charged refrigerant before delivery.
Charge additional refrigerant for field-installed connecting pipe. Check the table below (only
apply the liquid pipe as benchmark) for the refrigerant to be added when the pipeline length exceeds
one meter each time.
How much additional refrigerant should be charged.
Total refrigerant charging amount R= Pipeline charging amount A + Refrigerant charging amount
B of every module .
(1) Pipeline charging amount.
Added refrigerant quantity A for piping = ∑Liquid pipe length × Added refrigerant quantity for each
meter (in.) of liquid pipe.
Diameter of liquid pipe mm(in.)
28.6(1-1/8)
25.4(1)
22.2(7/8)
19.05(3/4)
15.9(5/8)
12.7(1/2)
9.52(3/8)
6.35(1/4)
kg/m 0.680 0.520 0.350 0.250 0.170 0.110 0.054 0.022
OZ/in.
0.61
0.47
0.31
0.22
0.15
0.10
0.05
0.02
(2) Refrigerant charging amount B of every module.
Refrigerant charging amount B of every
module kg(Pounds) Rated Capacity(1000Btu/h)
IDU/ODU rated
capacity collocation
ratio C
Quantity of
included IDUs(N) 72 96 120
50%≤C≤90% N＜4
0
0
0
N≥4 0.5(1.1) 0.5(1.1) 0.5(1.1)
90%＜C≤105% N＜4 1(2.2) 1(2.2) 1.5(3.3)
8＞N≥4 3.5(7.7) 2(4.4) 3(6.6)
N≥8
4(8.8)
3.5(7.7)
5.5(12.1)
105%＜C≤135% N＜4 2(4.4) 2(4.4) 2.5(5.5)
8＞N≥4
4(8.8)
3.5(7.7)
4(8.8)
N≥8
4.5(9.9)
4.5(9.9)
5(11.0)