GIA V4+R GIA2528WD2RN1TC User manual

INSTALLATION MANUAL
VRF
ENGLSIH
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V4+R | x2 | x3 | x4
GIA2528WD2RN1TC | GIA28010WD2RN1TC | GIA33512WD2RN1TC
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MCAC-VTSM-2011-09 Installation
Piping Selection
63
Installation
1 Installation Introduction..............................................56
2 Units Installation...........................................................70
2.1 Installation of Indoor Unit................................................70
2.2 Installation of Outdoor Unit .............................................70
2.3. Installation of MS equipment...........................................76
3 Refrigerant Pipe Engineering.....................................77
3.1 Refrigerant Pipe Processing............................................77
3.2 Air Tight Test..................................................................88
3.3 Vacuum Drying...............................................................90
3.4 Recharge of Refrigerant..................................................92
4 Drainage Pipe Engineering.........................................94
5 Duct Engineering..........................................................99
6 Heat Insulation Engineering.....................................101
7 Electrical Engineering................................................104
8 Commissioning...........................................................106

MCAC-VTSM-2011-09 Installation
64 Piping Selection
1. Installation Introduction
1.1 Select the Refrigerant Piping for V4+ Three pipe Heat Recovery modular type
1.1.1 Length and drop height permitted of the refrigerant piping
Permitted value
Piping
Piping length
Total pipe length(Actual)
350m
L1＋L2＋L3＋L4＋L5＋L6＋L7
＋L8+L9+L10+L11
a＋b＋c＋d＋e＋f＋g＋h＋
i+j+k+l+m+n
Maximum piping(L)
Actual length
150m
L1＋L7＋L9＋j+k+n
Equivalent length
175m
Piping (farthest from the first line pipe
branch) equivalent length
40m
L7＋L9＋j+k+n
Drop height
Indoor unit-outdoor
unit drop height
Outdoor unit up
50m
/
Outdoor unit down
50m
/
Indoor unit to indoor unit drop height
15m
/
Note：
1. All branches must be purchased from Midea, otherwise system is induced to malfunction.
2. Each branch equals to 0.5m pipe length.
N3
(140)
N5
(140) N6 (71)
N7
(71)
N9
(56)
N8
(28)
N2
(71)
N4
(28)
N1
(71)
N10
(56)
ABC
DEⅡ
ⅣⅢ
Ⅰ
b
c
d
f
g
j
h
i
l
km n
e
L1L2
L7
L11
L9
L8L10
L3
a
MS1 MS2
MS3
MS4
MS5
MS6
L4
L5
L6
Outdoor unit
(one or more outdoor units)
(From the first line branch pipe) Maximum


The first line branch pipe
Drop height between indoor 
indoor unit to indoor unit 
Indoor unit

MCAC-VTSM-2011-09 Installation
Piping Selection
65
1.1.2 Select the refrigerant piping
Note: In the above drawing, the capacity unit of indoor side is (×100W), and the outdoor side is HP.
The Pipe Type
The Detailed Pipe Place
Code
The main pipe
The pipe between outdoor and the first indoor branch
L1
Indoor main pipe
The pipe between indoor main branches
L2~L11
Indoor auxiliary pipe
The pipe between indoor branches
a, b, n
Indoor main branch
The branch for MS equipment
A,B,C,D,E
Indoor auxiliary branch
The branch connecting directly to indoor unit
I, II, III, IV
Outdoor branch
The outdoor branch assy.
L,M
Outdoor unit pipe
The pipe between outdoor unit and outdoor branch, pipe between
outdoor branches
g1, g2, g3, G1
MS Equipment
For shift heating/cooling mode.
MS1, MS6
1.1.2.1 Selection of the main pipe (L1)
E.g. The main pipe (L1) in the above drawing
Please refer to the following table:
Model
The Max. equivalent length of tubing ﹤90m
The Max. equivalent length of tubing ≥90m
Suction
Gas pipe
High-pressure
gas pipe
High-pressure
liquid pipe
The first
branch
Suction
Gas pipe
High-pressure
gas
High-pressure
liquid
The first branch
8HP

.1

FQZHN-02S



FQZHN-02S
10HP



FQZHN-02S



FQZHN-02S
16HP
28.6

15.9
FQZHN-03S
31.8
28.6
15.9
FQZHN-03S
18~20HP
31.8
28.6
15.9
FQZHN-03S
31.8
28.6

FQZHN-03S
24HP
34.9
28.6
15.9
FQZHN-04S
34.9
28.6

FQZHN-04S
26~30HP
34.9
28.6

FQZHN-04S
38.1
31.8
22.2
FQZHN-04S
Notice: main pipe dia.
L1
W3
(8) W2 (8) W1 (10)
ML
g1
j j j j j j
g2 g3
G1
N3
(140)
N5
(140) N6 (71)
N7
(71)
N9
(56)
N8
(28)
N2
(71)
N4
(28)
N1
(71)
N10
(56)
ABC
DEⅡ
ⅣⅢ
Ⅰ
b
c
d
f
g
j
h
i
l
km n
e
L2
L7
L11
L9
L8L10
L3
a
MS1 MS2
MS3
MS4
MS5
MS6
L4
L5
L6

MCAC-VTSM-2011-09 Installation
66 Piping Selection
according to the bigger one.
If the size of tubing for connecting outdoor unit is different from main pipe, a transfer connector should be
mounted.
Indoor main pipe/
indoor branch
Outdoor（HP）
Pipe dimension
(suction gas/discharge gas/Liquid)
Branch
L1/A
W1+W2+W3 =28
38.131.822.2
FQZHN-04S
1.1.2.2 Selection of indoor unit main pipe and the branching pipe
E.g. The branches (A,B,C,D,E, Indoor unit main pipe is between the 1st branching pipe A and the MS. The
branching pipe ( A B, C, D, E) is between the first branching pipe A and MS equipment. And indoor main pipe
(L2~L11) in the above drawing.
Please refer to the following table.
A: The total capacity of subordinate indoor units of tubing (The indoor unit from this tubing to the end)
A (×100W)
Suction Gas pipe
High-pressure gas pipe
High-pressure liquid pipe
Branch joint
A＜56



FQZHN-01S
＜166
9.1


FQZHN-01S
＜230

9.1

FQZHN-02S
＜330

9.1

FQZHN-02S
＜460
28.6


FQZHN-03S
＜660
28.6


FQZHN-03S
＜920
34.9
28.6
9.1
FQZHN-04S
＜1100
41.3
31.8
9.1
FQZHN-04S
1.1.2.3 Selection of the indoor auxiliary pipe and auxiliary branch
E.g. The pipe (a ~ n) in the above drawing. Branch I,II,III,IV
Please refer to the following table.
The total capacity of
Indoor units(×100W)
When indoor unit 
When indoor unit pipe length>10m
Branch
Gas side
Liquid side
Gas side
Liquid side





FQZHN-01S





FQZHN-01S
1.1.2.4 Selection of MS:
A (×100W)
MS Box Model
A＜56
GIA-MS02/N1-A

GIA-MS04/N1-A
1.1.2.5 Selection of the Outdoor branch (L, M) and the outdoor unit pipe (g1, g2, g3, G1)
E.g. The branch (L, M) and outdoor unit pipe (g1, g2, g3, G1) in the above drawing.
When there is only single outdoor unit (), please refer to the
following table:
Model
The outdoor unit pipe dia. (mm)
Suction Gas pipe
High-pressure gas pipe
High-pressure liquid pipe
GIA-2528WD1RN1TB



GIA-28010WD1RN1TB



When multi outdoor units are paralleled, please refer to the following table:
Outdoor unit
quantity
Drawing example
Outdoor unit pipe dia.(mm)
Outdoor branch

MCAC-VTSM-2011-09 Installation
Piping Selection
67
1
25.419.1/2.7;
/
2
g1,g2：
16HP: 28.6/;
18-20HP: 28.6/19.1.
L：
FQZHW-02N1S
3
g1,g2,g3：
24HP: 34.928.69.1;
26-30HP: 38.131.822.2
G1: 28.6/
FQZHW-03N1S
Notice: All branches must be purchased from Midea.
1.1.3 Pipe selection example
Please See above Drawing same as 1.1.2, suppose total equivalent pipe length beyond 90m.
1.1.3.1 Select each indoor unit pipe according to the following table
The total capacity of
Indoor units(×100W)
When indoor unit pipe length≤10m
When indoor unit pipe length>10m
Gas side
Liquid side
Gas side
Liquid side










1.1.3.2 Select the indoor unit main pipe (L2~L11) and the branching pipe (B.C.D.E) refer table 4.4
Indoor main pipe/ indoor
branch
Total capacity of
indoor units (×100W)
Range
Pipe dimension
(Suction/Discharge
/Liquid)
Branch
L2/B
N1+N2+N3+N4=310

9.1
FQZHN-02S
L3
N1+N2=172
166230
9.19.5
-----
L4/C
N3+N4=168
166230
9.19.5
FQZHN-02S
L5
N3=140
56166
15.9
-----
L6
N4=28
A<56
.4
-----
L7/D
N510=422
3460

FQZHN-03S
L8/E
N5+ N6+N7=282

9.1
FQZHN-02S
L10
N5=140
56166
15.9
----
L11
N6+N7=142
56166
15.9
----
L9
N8+N9+N10=140
56166
15.9
----
1.1.3.3 ),the branching pipe (eg.Ⅰ,Ⅱ,Ⅲ,Ⅳ)after MS
equipment refer table
*.
Indoor aux. pipe/ indoor
branch
Total capacity of
indoor units (×100W)
Range
Pipe dimension
(gas/Liquid)
Branch
a/Ⅰ
N1+N2=142
A≥56
15.99.5
FQZHN-01C
b
N1=71
A≥56
15.99.5
----
c
N2=71
A≥56
15.99.5
----
d
N4=28
A≤45
12.76.4
----
e
N3=140
A≥56
15.99.5
FQZHN-01C
f
N5=140
A≥56
15.99.5
----
g/Ⅱ
N6+N7=142
A≥56
15.99.5
FQZHN-01C

MCAC-VTSM-2011-09 Installation
68 Piping Selection
h
N6=71
A≥56
15.99.5
----
i
N7=71
A≥56
15.99.5
----
j/Ⅳ
N8140
A≥56
15.99.5
FQZHN-01S
k/Ⅲ,
N9+N10=112
A≥56
15.99.5
FQZHN-01S
m
N9=56
A≥56
15.99.5
----
n
N10=56
A≥56
15.99.5
----
i
N8=28
A≤45
12.76.4
----
1.1.3.4 Select the MS equipment refer table 4.5
MS equipment
Total capacity of indoor units (×100W)
Range
MS model
MS1
N1+N2=142
A≥56
GIA-MS04/N1-A
MS2
N3=140
A≥56
GIA-MS04/N1-A
MS3
N4=28
A≤45
GIA-MS02/N1-A
MS4
N5=140
A≥56
GIA-MS04/N1-A
MS5
N6+N7=142
A≥56
GIA-MS04/N1-A
MS6
N8+N9+N10=140
A≥56
GIA-MS04/N1-A
1.1.3.5 Select the main pipes and branch pipes of indoor units after MS according to table 3.7
Total number of indoor
units under 1 MS
Main Pipe dimension
(gas/Liquid)
Range
Branch Pipe dimension
(gas/Liquid)
MS
1
15.99.5
A≤45
12.76.4
FQZHN-01C
A≥56
15.99.5
2
15.99.5
A≤45
12.76.4
FQZHN-01C
A≥56
15.99.5
3

A≤45
12.76.4
FQZHN-01C
A≥56
15.99.5
4

A≤45
12.76.4
FQZHN-01C
A≥56
15.99.5
1.1.3.6 Select the main pipes and the branching pipes of outdoor unit refer table 3.8
Outdoor unit
connective pipe
capacity of outdoor units
(Hp)
Pipe dimension
(Suction/Discharge Gas/Liquid)
Branching pipes
g1/M
8
25.419.112.7
FQZHW-03N1S
g2/L
8
25.419.112.7
FQZHW-03N1S
g3
10
25.419.112.7
----
G1
18
38.128.619.1
----
1.1.3.7 Compare the total capacity from indoor side and outdoor side, select the main pipe dia. according to
the bigger one.
1.1.4 Branch drawing
1.1.4.1 Indoor branch drawing
Indoor
branch
Liquid side
Suction Gas side
High Pressure Gas side

MCAC-VTSM-2011-09 Installation
Piping Selection
69
FQZHN01S
FQZHN02S
FQZHN03S
FQZHN04S
1.1.4.2 Outdoor branch drawing
branch
model
FQZHW02N1S FQZHW03N1S
Discharge
Gas side
joint
Suction gas
side joint
Liquid side
joint
ID:25.4
ID:19.1
ID:19.1
0D:25.4
ID:22.2
ID:25.4
ID:19.1
ID:19.1
0D:25.4
ID:22.2
ID:28.6 ID:31.8
OD:28.6
ID:28.6
ID:19.1
ID:22.2
OD:28.6
ID:19.1
ID:22.2
OD:28.6
ID:15.9
0D:34.9ID:34.9
ID:38.1
ID:34.9
ID:31.8
ID:31.8
0D:31.8
ID:25.4
0D:31.8
ID:31.8
ID:25.4
ID:31.8
0D:34.9
ID:31.8
ID:38.1
ID:34.9
0D:31.8
ID:25.4
0D:31.8 ID:38.1
ID:41.3
ID:31.8
0D:31.8
ID:31.8
ID:25.4
ID:31.8
ID:25.4
ID:15.9
0D:19.1
ID:19.1
ID:15.9
ID:22.2
ID:19.1
ID:15.9
0D:15.9
ID:12.7
ID:12.7
0D:15.9
ID:15.9
ID:15.9
ID:19.1
ID:15.9
0D:15.9
ID:12.7
ID:12.7
0D:15.9 ID:19.1 0D:22.2ID:22.2
ID:19.1
ID:15.9
0D:15.9
ID:15.9
ID:12.7

MCAC-VTSM-2011-09 Installation
70 Piping Selection
Oil-Balance
pipe
1.1.4.3 Branch pipe drawing after MS
Name
Gas side joints
Liquid side joints
FQZHN01C
1.3 Installation Procedure
1.3.1 Importance of the Installation Operation
Effect of installation issues on equipment:
ID:6.4
P
ID:12.7
(ID:15.9)
OD:19.1
ID:19.1
OD:19.1
ID:19.1
ID:15.9
ID:12.7
(ID:15.9)
OD:19.1
OD:12.7
ID:9.5
ID:9.5
ID:6.4
OD:9.5
ID:6.4 OD:9.5
ID:9.5
Insufficient refrigerant
Over heated running
Compressor fault
Filth blockage of refrigerant pipe
Leakage of refrigerant pipe
Product of the chemical reaction between ice or water of
throttling parts and the refrigerant damages the insulation
Moisture of refrigerant pipe
Degraded efficiency or
abnormal protection
Improper
installation
location
Degraded heat exchange effect of indoor unit
No maintenance space leading to difficult in upkeep
Poor heat dissipation of outdoor unit
No insulation test for power supply line
Damaged electric parts
Cross connection between power cable and signal
cable

MCAC-VTSM-2011-09 Installation
Unit Installation
71
1.3.2 General procedure
Pipe pre-install engineering...............................Ensure that the water drainage pipe inclines downward
Installing indoor unit Check the model to avoid incorrect installation
Refrigerant piping engineering ...........................Keep the refrigerant pipes dry, clean and sealed
Water drainage piping engineering ......................Downward inclination
Air duct engineering........................................Ensure sufficient ventilation rate
Thermal insulation engineering...........................Ensure no gap between the thermal insulation materials
Electric engineering ........................................Select proper power cables
(signal cable, power cable) ............................. (Use 3-cores shielded wires)
On-site setup Follow the wiring diagram (to avoid incorrect setup)
Civil work for outdoor unit .................................Avoid short-circuit ventilation and ensure sufficient maintenance
space
Installing outdoor unit......................................Avoid short-circuit ventilation and ensure sufficient maintenance
space
Air tightness test............................................Check whether the air pressure remains at 4.0Mpa (R410a) after
correction is made within 24 hours
Vacuum drying Use vacuum pump that has a vacuum degree of less than -775mmHg
recharging refrigerant......................................Record the amount of refrigerant to be recharged on the outdoor
unit and document it
Installing decorative panel ................................Ensure no gap between decorative panel and ceiling
Test Running and commissioning........................Run the indoor units one by one to check whether any pipe or cable
is incorrectly installed
Delivering operation instructions .........................Deliver relatedmaterials while providing operation instructionto the
user
Note: The general procedure for refrigerant machine is subject to change according to the situation