NORTEK GLOBAL HVAC, LLC DC Inverter VRF Units Owner's Manual

NORTEK GLOBAL HVAC, LLC  DC Inverter VRF Units Owner's Manual
NORTEK GLOBAL HVAC, LLC
DC Inverter VRF Units
Owner's Manual
Heat Recovery
V5BV-R72WMBK
V5BV-R96WMBK
V5BV-R120WMBK
z
z
Please read this owner’s manual carefully before operation and retain it for future reference
Specifications & illustrations subject to change without notice or incurring obligations
Preface
The DC Inverter Multi VRF System, with the most advanced technology in the world, uses
eco-friendly refrigerant R410A. For correct installation and operation, please read this manual
carefully.
WARNING
WARNING NOTICE: Failure to comply with warning notice could result in property
damage, serious personal injury or death
CAUTION
CAUTION NOTICE: Failure to comply with caution notice could result in property
damage or personal injury
NOTICE: Failure to comply with notice could result in property damage
WARNING
(1) Instructions for installation and use of this product are provided by the manufacturer.
(2) Installation must be performed 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 IDUs should be within the gross rated capacity of
ODU. Otherwise, IDU’s cooling/heating performance will be reduced.
(5) This manual must be kept for future reference.
(6) In case of malfunction or operation failure, please examine the following items and contact a qualified
service technician as soon as possible.
1) Nameplate (model, cooling capacity, product code ship date).
2) Malfunction status (detail description of conditions before and after malfunction occured)
(7) All units have been strictly tested and proved to be qualified before shipment. To avoid unit damage or
even operation failure which may be caused by improper service, please do not disassemble units by
yourself.
(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 without prior notice.
(9) If the supply cord is damaged, it must be replaced an appropriate size cord.
Children should not be allowed to play on or near this equipment.
DISPOSAL: Do not dispose this product as unsorted household waste. Recycle according to
local ordinances.
Contents
1 SAFETY PRECAUTIONS .................................................................................................................... 1
2 PRODUCT INTRODUCTION ............................................................................................................... 3
2.1 NAMES OF MAIN PARTS .................................................................................................................... 3
2.2 COMBINATIONS OF OUTDOOR UNITS ................................................................................................. 3
2.3 COMBINATIONS OF INDOOR AND OUTDOOR UNITS .............................................................................. 4
2.4 THE RANGE OF PRODUCTION W ORKING TEMPERATURE ..................................................................... 5
3 PREPARATION BEFORE INSTALLATION ......................................................................................... 6
3.1 STANDARD PARTS ............................................................................................................................ 6
3.2 INSTALLATION SITE ........................................................................................................................... 6
4 INSTALLATION INSTRUCTION ........................................................................................................ 13
4.1 PHYSICAL DIMENSION OF THE OUTDOOR UNIT AND MOUNTING HOLE ................................................ 13
4.2 CONNECTION PIPE ......................................................................................................................... 14
4.3 INSTALLATION OF THE CONNECTION PIPE......................................................................................... 22
4.4 AIR PURGING AND REFRIGERANT CHARGE....................................................................................... 25
4.5 ELECTRIC W IRING .......................................................................................................................... 28
4.6 SYSTEM COMMUNICATION............................................................................................................... 31
4.7 CONNECTION METHOD AND STEPS FOR SYSTEM COMMUNICATION ................................................... 37
4.8 EXTERNAL ELECTRICAL W IRING DIAGRAM ....................................................................................... 44
5 CHECK ITEMS AFTER INSTALLATION AND TRIAL RUN .............................................................. 46
5.1 CHECK ITEMS AFTER INSTALLATION ................................................................................................. 46
5.2 TRIAL RUN ..................................................................................................................................... 46
6 COMMON MALFUNCTION AND TROUBLESHOOTING ................................................................. 59
7 ERROR INDICATION ......................................................................................................................... 61
8 MAINTENANCE AND CARE ............................................................................................................. 65
8.1 OUTDOOR HEAT EXCHANGER ......................................................................................................... 65
8.2 DRAIN PIPE .................................................................................................................................... 65
8.3 NOTICE BEFORE SEASONAL USE ..................................................................................................... 65
8.4 MAINTENANCE AFTER SEASONAL USE ............................................................................................. 65
8.5 PARTS REPLACEMENT .................................................................................................................... 65
9 AFTER-SALES SERVICE .................................................................................................................. 66
Heat Recovery DC Inverter VRF Multi Units
1 Safety Precautions
WARNING
(1) Follow this instruction to complete the installation work. Please read this manual carefully before unit
startup and service.
(2) Wire size of power cord should be sufficient to handle voltage. The damaged power cord and connection
wire should be replaced by appropriate size cable.
(3) After connecting the power cord, please secure the electric box cover properly in order to avoid accident.
(4) Never fail to comply with the nitrogen charge requirements. Charge with nitrogen when welding pipes.
(5) Never short-circuit or bypass the pressure switch.
(6) used Connect wired controller before turning power on to the unit or controller could be damaged .
(7) Before using the unit, please check if the piping and wiring are correct to avoid water leakage, refrigerant
leakage, electric shock, or fire etc..
(8) Do not insert fingers or objects into air outlet/inlet grille.
(9) Allow for adequate ventilation during installation, especially when installing gas/oil heating equipment..
(10) Never start up or shut off the air conditioner by means of directly plug ging or unplugging the power cord.
(11) Turn off the unit after it runs at least five minutes; otherwise it will adversely affect oil return of the
compressor.
(12) Do not allow children operate this unit.
(13) Do not operate this unit with wet hands.
(14) Turn off the unit or cut off the power supply before cleaning, otherwise electric shock or injury may occur.
(15) Never spray or flush water towards unit, otherwise malfunction or electric shock may occur.
(16) Do not expose the unit to the wet or corrosive circumstances.
(17) Under cooling mode, please don't set the room temperature too low and keep the temper ature difference
between indoor and outdoor unit within 5嘙C(9嘙F).
(18) User is not allowed to repair the unit. Faulty service may cause electric shock or fire. Please contact a
qualified technician for help.
(19) Before installation, please check if the power supply matches the requirements specified on the
nameplate..
(20) Installation should be conducted by qualified personnel. Please do not attempt to install the unit by
yourself. Improper handling may result in water leakage, electric shock or fire etc..
(21) Be sure to use the appropriate accessories and parts to prevent the water leakage, electric shock and
fire.
(22) Make sure the unit can be grounded properly and securely to avoid electric shock. Please do not connect
the ground wire to gas pipe, water pipe, lightning rod or telephone line.
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Heat Recovery DC Inverter VRF Multi Units
(23) Turn power on to the unit 8 hours before startup. Do not disconnect the power when you want to stop the
unit for a short period of time, i.e. overnight
(24) If refrigerant leakage occurs during installation, please ventilate immediately. Toxic gas will result if the
refrigerant gas meets spark or fire.
(25) When cleaning the unit, please be aware that volatile liquid, such as paint thinner or gasoline will
damage the unit appearance. Only use soft cloth with a little mild detergent to clean the outer casing of
unit.
(26) If you notice anything unusual (such as burning smell), please cut off the main power supply, and
immediately contact a qualified service technician. Failure to disconnect power could damage the unit
and lead to electric shock or fire.
Manufacture will not assume responsibility of personal injury or equipment damage caused by
improper installation and commission, unnecessary service inability of following instructions listed
in this manual.
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Heat Recovery DC Inverter VRF Multi Units
2 Product Introduction
This Multi VRF Modular System adopts inverter compressor technology. The stepless
capacity modulation allows for an operating range of 10%-100%. Several indoor air handler
models are available with operation range from 72K Btu to 360K. These can be widely used in
working area and are especially applicable in places with variable load requirements..
2.1 Names of Main Parts
Fig.1
NO.
ķ
ĸ
Ĺ
ĺ
Ļ
Name
Fan, Motor
Electric Box
Assembly
Valve interface
Power cord
through-hole
Communication
code through-hole
2.2 Combinations of Outdoor Units
Cooling Capacity
MBH / kW
Combine
Models
144 / 44.8
168 / 50.4
192 / 55.9
V5BV-R72WMBK+
V5BV-R72WMBK
V5BV-R72WMBK+
V5BV-R96WMBK
V5BV-R96WMBK+
V5BV-R96WMBK
3
Heat Recovery DC Inverter VRF Multi Units
Cooling Capacity
MBH / kW
Combine
Models
Cooling Capacity
MBH / kW
Combine
Models
Cooling Capacity
MBH / kW
Combine
Models
216 / 61.5
240 / 67
264 / 78.4
V5BV-R96WMBK+
V5BV-R120WMBK
V5BV-R120WMBK+
V5BV-R120WMBK
V5BV-R72WMBK+
V5BV-R96WMBK+
V5BV-R96WMBK
288 / 84
312 / 89.5
336 / 95
V5BV-R96WMBK+
V5BV-R96WMBK+
V5BV-R96WMBK
V5BV-R96WMBK+
V5BV-R96WMBK+
V5BV-R120WMBK
V5BV-R96WMBK+
V5BV-R120WMBK+
V5BV-R120WMBK
360 / 100.5
V5BV-R120WMBK+
V5BV-R120WMBK+
V5BV-R120WMBK
2.3 Combinations of Indoor and Outdoor Units
Cooling Capacity MBH /
kW
Max number of
connectable IDU
(unit)
Cooling Capacity MBH /
kW
Max number of
connectable IDU (unit)
72 / 22.4
12
240 / 67
41
96 / 28
16
264 / 78.4
45
120 / 33.5
20
288 / 84
49
144 / 44.8
25
312 / 89.5
53
168 / 50.4
29
336 / 95
58
192 / 55.9
33
360 / 100.5
61
216 / 61.5
37
The total capacity of indoor units should be within 50%~135% of that of outdoor units.
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Heat Recovery DC Inverter VRF Multi Units
Fig.2
Fig.2 illustrates the combination of the ODU of Modular DC Inverter Multi VRF System and
the IDU of Multi VRF System. 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.
2.4 The Range of Production Working Temperature
Cooling operation
Ambient temperature: -5嘙C(23嘙F)~50嘙C(122嘙F)
Heating operation
Ambient temperature: -20嘙C(-4嘙F)~24嘙C(75.2嘙F)
NOTICE! Operation outside of Temperature Range may damage this product and will
invalidate the warranty.
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Heat Recovery DC Inverter VRF Multi Units
3 Preparation before Installation
Note: The graphic is only used for reference. Your product may look differently.
Unit: mm(inch).
3.1 Standard Parts
Please use the following standard parts supplied by manufacturer.
Parts for Outdoor Unit
Number
Name
Picture
Quantity
1
Owner's Manual
1
2
Wiring (match with
resistance)
1
Remarks
Must be connected to the last
IDU of communication
connection
3.2 Installation Site
WARNING
Check the support structure to verify that it has sufficient load -carrying capacity to support the weight of the
unit, and it can be securely mounted
Never expose the unit to direct sunlight and rainfall. Installation should also be free from dirt as much as
possible.
Try to keep the unit away from combustible, inflammable and corrosive or exhaust gas.
Leave sufficient space for servicing the equipment.
Place the indoor and outdoor units as close as possible to each other to minimize the pipe length and bends.
Children are not allowed to play on or near equipment.
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Heat Recovery DC Inverter VRF Multi Units
3.2.1 When the outdoor unit is totally surrounded by walls, please refer to following
figures for clearance dimension.
3.2.1.1 Clearance dimension for single-module unit
Fig.3
3.2.1.2 Space dimension for dual-module unit
Fig.4
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Heat Recovery DC Inverter VRF Multi Units
3.2.1.3 Clearance dimension for three-module unit
Fig.5
3.2.2 When there is wall (or similar obstruction) above the unit, keep the distance
between the unit top and the wall at least 3000mm (10 feet). When the unit is located
in a totally open space with no obstructions in four directions, keep the distance
between the unit top and wall at least 1500mm (5 feet) or above (See Fig.6). When
space is limited within 1500mm (5 feet) or the unit is not set in an open space, air
return duct is required to be installed for ventilation (See Fig.7).
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Heat Recovery DC Inverter VRF Multi Units
Fig.6
Fig.7
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Heat Recovery DC Inverter VRF Multi Units
3.2.3 Space dimension for multiple-module unit
For good ventilation, make sure there are no obstructions above the units.
When the units are located at a half-open space (front and left/right side is open), install the
unit as per these or opposite direction.
Fig.8
Fig.9
Fig.10
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Heat Recovery DC Inverter VRF Multi Units
3.2.4 Consider seasonal wind direction when installing the outdoor unit
Fig.11
3.2.5 Consider snowfall when installing the outdoor unit
Fig.12
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Heat Recovery DC Inverter VRF Multi Units
3.3 Piping Work Requirements
Refer to the table below for piping work requirements.
R410A Refrigeratn System
Outer diameter (mm/inch)
Wall thickness mm(inch)
Type
Φ6.35(1/4)
≥0.8(1/32)
0
Φ9.52(3/8)
≥0.8(1/32)
0
Φ12.70(1/2)
≥0.8(1/32)
0
Φ15.9(5/8)
≥1.0(1/32)
0
Φ19.05(3/4)
≥1.0(1/32)
Φ22.2(7/8)
≥1.2(1/16)
0
1/2H
Φ25.40(1/1)
≥1.2(1/16)
1/2H
Φ28.60(9/8)
≥1.2(1/16)
1/2H
Φ31.80(5/4)
≥1.3(1/16)
1/2H
Φ34.90(11/8)
≥1.3(1/16)
1/2H
Φ38.10(12/8)
≥1.5(1/16)
1/2H
Φ41.30(13/8)
≥1.5(1/16)
1/2H
Φ44.5(7/4)
≥1.5(1/16)
1/2H
Φ51.4(7/4)
≥1.5(1/16)
1/2H
Φ54.1(17/8)
≥1.5(1/16)
1/2H
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Heat Recovery DC Inverter VRF Multi Units
4 Installation Instruction
4.1 Physical Dimension of the Outdoor Unit and Mounting Hole
Outline and Physical Dimension of V5BV-R72WMBK, V5BV-R96WMBK,and
V5BV-R120WMBK unit.
Fig.13
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Heat Recovery DC Inverter VRF Multi Units
4.2 Connection Pipe
4.2.1 Schematic Diagram of Piping Connection
Fig.14
4.2.2 Schematic Diagram of Piping Sequence
V5BV-R72WMBK, V5BV-R96WMBK, and V5BV-R120WMBK
Fig.1
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Heat Recovery DC Inverter VRF Multi Units
4.2.3 Allowable pipe length and drop height between indoor and outdoor units
Y type branch joint is used to connect indoor and outdoor units. Connecting method is shown
in the figure below.
Note: Equivalent length of one Y-type manifold is about 0.5m (1-3/4feet).
Fig.16
L10: 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 (1-3/4feet).
.
R410A Refrigerant System
Allowable Value
m(feet)
Fitting Pipe
Total length (actual length) of fitting pipe
≤1000(3280)
L1+L2+L3+L4+…+L9+a+b+…+i+j
Length of farthest
fitting pipe m(feet)
Actual length
≤165(541)
Equivalent length
≤190(623)
L1+L6+L7+L8+L9+j
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
≤40(131)
L10-L11
Equivalent length from the first branch to the
furthest piping (1)
≤40(131)
L6+L7+L8+L9+j
Height difference
Outdoor unit at upper(2)
between outdoor unit
Outdoor unit at lower(2)
and indoor unit
≤90(295)
——
≤90(295)
——
Height difference between indoor units
≤30(98)
——
Maximum length of Main pipe(3)
≤90(295)
L1
From IDU to its nearest branch (4)
≤10(32)
a,b,c,d,e,f,g,h,i,j
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Heat Recovery DC Inverter VRF Multi Units
Notices:
(1) Normally, the pipe length from the first branch of IDU to the farthest IDU is 40m (131 feet).
Under the following conditions, the length can reach 90m (295 feet).
1) Actual length of pipe in total: L1+L2x2+L3x2+L4x2+…+L9x2+a+b+…+i+j≤1000m (3280
feet).
2) Length between each IDU and its nearest branch a, b, c, d, e, f, g, h, i, j≤40m (131 4feet).
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: L10-L11≤40m (131 feet).
(2) When the outdoor unit is at upper side and height difference is more than 50m (164 feet),
please consult factory agent for the related technical requirement.
(3) When the maximum length of the main pipe from ODU to the first branch of IDU is≥90m
(295 feet), then adjust the pipe size of the gas pipe and liquid pipe of main pipe according to the
following table.
Size of connection between outdoor unit and the first indoor branch
Cooling Capacity MBH / kW
Low pressure gas pipe
mm(inch)
Liquid pipe mm(inch)
High pressure gas
pipe mm(inch)
72 / 22.4
Φ19.05(3/4)
Φ9.52(3/8)
Φ15.9(5/8)
96 / 28
Φ22.2(7/8)
Φ9.52(3/8)
Φ19.05(3/4)
120 / 33.5
Φ28.6(1-1/8)
Φ15.9(5/8)
Φ22.2(7/8)
144/ 44.8
Φ31.8(1-1/8)
Φ15.9(5/8)
Φ25.4(1)
168 / 50.4
Ф34.9(1-3/8)
Ф19.05(3/4)
Φ25.4(1)
192 / 55.9
Ф34.9(1-3/8)
Ф19.05(3/4)
Φ25.4(1)
216 / 61.5
Ф34.9(1-3/8)
Ф19.05(3/4)
Φ28.6(1-1/8)
240 / 67
Φ38.1(1-1/2)
Φ22.2(7/8)
Φ31.8(1-1/2)
264 / 78.4
Φ38.1(1-1/2)
Φ22.2(7/8)
Φ31.8(1-1/2)
288 / 84
Φ38.1(1-1/2)
Φ22.2(7/8)
Φ31.8(1-1/2)
312 / 89.5
Φ38.1(1-1/2)
Φ22.2(7/8)
Φ31.8(1-1/2)
336 / 95
Φ41.3(1-5/8)
Φ22.2(7/8)
Φ34.9(1-3/8)
360 / 100.5
Φ44.5(1-3/4)
Φ22.2(7/8)
Φ34.9(1-3/8)
(4) If the length between an IDU and its nearest branch is above 10m (33 feet), then double
the size of the liquid pipe of IDU (only for the pipe size that is≤6.35mm (1/4inch).
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Heat Recovery DC Inverter VRF Multi Units
4.2.4 Connection Pipe among Outdoor Modules
Fig.17
Fig.18
Note: When the distance between outdoor units exceeds 2m (6-1/2 feet), U-type oil trap should be
added at low-pressure gas pipe. A+B≤10m (33 feet).
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Heat Recovery DC Inverter VRF Multi Units
4.2.5 Size requirement for branch pipe and piping (main pipe)
4.2.5.1 Connection sketch map of single-module system
Fig.19
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Heat Recovery DC Inverter VRF Multi Units
4.2.5.2 Connection sketch map of multi-module system
Fig.20
4.2.5.3 Select appropriate pipe between outdoor unit and the first indoor branch (“L”) as per the
pipe size of outdoor unit. Pipe size of basic outdoor module is shown as follows:
Basic module
Pipe between outdoor unit and the first indoor branch
Low pressure gas pipe
High pressure gas pipe
Liquid pipe mm(inch)
mm(inch)
mm(inch)
V5BV-R72WMBK
Φ19.05(3/4)
Φ9.52(3/8)
Φ15.9(5/8)
V5BV-R96WMBK
Φ22.2(7/8)
Φ9.52(3/8)
Φ19.05(3/4)
V5BV-R120WMBK
Φ28.6(1-1/8)
Φ12.7(1/2)
Φ22.2(7/8)
4.2.5.4 For multi-module system, select appropriate branch (”M1ǃM2ǃM3”) connected to
outdoor module as per the pipe size of basic outdoor module. Pipe size of basic outdoor
module is shown as follows:
Basic module
Size of the pipe between module and outdoor branch
Low pressure gas pipe
Liquid pipe
High pressure gas pipe
mm(inch)
mm(inch)
mm(inch)
V5BV-R72WMBK
Φ19.05(3/4)
Φ9.52(3/8)
Φ15.9(5/8)
V5BV-R96WMBK
Φ22.2(7/8)
Φ9.52(3/8)
Φ19.05(3/4)
V5BV-R120WMBK
Φ28.6(1-1/8)
Φ12.7(1/2)
Φ22.2(7/8)
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Heat Recovery DC Inverter VRF Multi Units
Selection of branch “Y1ǃY2”of outdoor modules:
Selection of branch of outdoor
modules
Module’s capacity (C)
Model
144≤C
ML01R
4.2.5.5 Size of connection pipe ”M4” between branches of each basic module
Size of connection pipe between branches of each basic module is determined by the total
rated capacity of upstream modules.
Total capacity of upstream
modules Q(Btu/h)
Pipe size between manifolds
Low pressure gas pipe
mm(inch)
Liquid Pipe
mm(inch)
High pressure gas pipe
(mm)
76000≥Q
Φ19.05(3/4)
Φ9.52(3/8)
Φ15.9(5/8)
96000≥Q˚76000
Φ22.2(7/8)
Φ9.52(3/8)
Φ19.05(3/4)
153000≥Q˚96000
Φ28.6(1-1/8)
Φ12.7(1/2)
Φ19.05(3/4)
232000≥Q˚153000
Φ28.6(1-1/8)
Φ15.9(5/8)
Φ22.2(7/8)
327000≥Q˚232000
Φ31.8(1-1/4)
Φ19.05(3/4)
Φ25.4(1)
461000≥Q˚327000
Φ38.1(1-1/2)
Φ19.05(3/4)
Φ28.6(1-1/8)
Q˚461000
Φ44.5(1-3/4)
Φ22.2(7/8)
Φ31.8(1-1/2)
4.2.5.6 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
Size of connection between outdoor unit and the first indoor branch
Low pressure gas pipe
mm(inch)
Liquid pipe
mm(inch)
High pressure
gas pipe
mm(inch)
V5BV-R72WMBK
Φ19.05(3/4)
Φ9.52(3/8)
Φ15.9(5/8)
V5BV-R96WMBK
Φ22.2(7/8)
Φ9.52(3/8)
Φ19.05(3/4)
V5BV-R120WMBK
Φ25.4(1)
Φ12.7(1/2)
Φ19.05(3/4)
V5BV-R72WMBK
+ V5BV-R72WMBK
Φ28.6(1-1/8)
Φ12.7(1/2)
Φ22.2(7/8)
V5BV-R72WMBK
+ V5BV-R96WMBK
Φ28.6(1-1/8)
Φ15.9(5/8)
Φ25.4(1)
V5BV-R96WMBK
+ V5BV-R96WMBK
Φ28.6(1-1/8)
Φ15.9(5/8)
Φ25.4(1)
V5BV-R96WMBK
+ V5BV-R120WMBK
Φ28.6(1-1/8)
Φ15.9(5/8)
Φ25.4(1)
V5BV-R120WMBK
+ V5BV-R120WMBK
Ф31.8(1-1/4)
Ф19.05(3/4)
Φ28.6(1-1/8)
V5BV-R72WMBK
+ V5BV-R96WMBK
+ V5BV-R96WMBK
Ф31.8(1-1/4)
Ф19.05(3/4)
Φ28.6(1-1/8)
V5BV-R96WMBK
+ V5BV-R96WMBK
+ V5BV-R96WMBK
Ф31.8(1-1/4)
Ф19.05(3/4)
Φ28.6(1-1/8)
Basic modules
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Heat Recovery DC Inverter VRF Multi Units
V5BV-R96WMBK
+ V5BV-R96WMBK
+ V5BV-R120WMBK
Ф31.8(1-1/4)
Ф19.05(3/4)
Φ28.6(1-1/8)
V5BV-R96WMBK
+ V5BV-R120WMBK
+ V5BV-R120WMBK
Ф31.8(1-1/4)
Ф19.05(3/4)
Φ28.6(1-1/8)
V5BV-R120WMBK
+ V5BV-R120WMBK
+ V5BV-R120WMBK
Ф38.1(1-1/2)
Ф19.05(3/4)
Φ31.8(1-1/4)
4.2.5.7 Branch selection of mode exchanger (“A1, A2)
Select branch of mode exchanger as per total capacity of downstream indoor unit(s).
Please refer to the following table.
R410A refrigerant system
Total Capacity of the Downstream Indoor Unit X(Btu/h)
Model
Y-Type Branch Pipe
X≤19100
19100˘X≤75000
75000˘X≤102360
102360˘X≤232000
232000˘X≤327500
327500˘X≤460620
460620˘X
FQ01Na/A
FQ02Na/A
FQ03Na/A
FQ04Na/A
FQ05Na/A
FQ06Na/A
FQ07Na/A
4.2.5.8 Piping size among upstream branches of heat pump mode exchanger (”n1ǃn2ǃn3ǃ
n4”)
Total rated capacity of downstream
indoor units: X(Btu/h)
Size of connection pipe between branches of mode exchanger
Low pressure gas pipe
mm(inch)
Liquid pipe
mm(inch)
High pressure gas pipe
mm(inch)
X≤48500
Φ19.05(3/4)
Φ9.52(3/8)
Φ15.9(5/8)
48500˘X≤136500
Φ28.6(1-1/8)
Φ12.7(1/2)
Φ22.2(7/8)
136500˘X≤272960
Φ28.6(1-1/8)
Φ15.9(5/8)
Φ22.2(7/8)
272960˘X≤327552
Φ31.8(1-1/4)
Φ19.05(3/4)
Φ28.6(1-1/8)
327552˘X≤460620
Φ38.1(1-1/2)
Φ19.05(3/4)
Φ31.8(1-1/4)
460620˘X
Φ44.5(1-3/4)
Φ22.2(7/8)
Φ38.1(1-1/2)
4.2.5.9 Piping size among downstream branches of heat pump mode exchanger ”aǃh”
Total rated capacity of downstream
indoor units: X ((Btu/h)
X≤19100
Size of piping between indoor branches
Gas pipe
Liquid pipe
mm(inch)
mm(inch)
Φ12.7(1/2)
Φ6.35(1/4)
19100˘X≤48450
Φ15.9(5/8)
Φ9.52(3/8)
48450˘X≤68200
Φ19.05(3/4)
Φ9.52(3/8)
4.2.5.10 Branch selection of downstream indoor unit of mode exchanger (”B1ǃB2”)
R410A
refrigerant system
Y-type branch
Total rated capacity of downstream
indoor units: X(Btu/h)
Model
X≤68200
FQ01A/A
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Heat Recovery DC Inverter VRF Multi Units
4.2.5.11 Piping size between mode exchanger and downstream indoor unit (” bǃcǃdǃ
g”)
Piping size between indoor branches
Total rated capacity of downstream
indoor units: X (Btu/h)
Gas pipe
mm(inch)
Liquid pipe
mm(inch)
X≤19100
Φ12.7(1/2)
Φ6.35(1/4)
19100˘X≤48450
Φ15.9(5/8)
Φ9.52(3/8)
48450˘X≤68200
Φ19.05(3/4)
Φ9.52(3/8)
4.2.5.12 Piping between indoor branch and indoor unit (”eǃfǃiǃj”)
Size of connection pipe between indoor branch and indoor unit should be consistent with
the connection pipe of indoor unit.
Rated capacity of indoor units:
X ((Btu/h)
Size of connection pipe between indoor branch and indoor unit
Gas pipe
mm(inch)
Liquid pipe
mm(inch)
X≤9554
Φ9.52(3/8)
Φ6.35(1/4)
9554˘X≤17060
Φ12.7(1/2)
Φ6.35(1/4)
17060˘X≤47700
Φ15.9(5/8)
Φ9.52(3/8)
47700˘X≤54600
Φ19.05(3/4)
Φ9.52(3/8)
4.3 Installation of the Connection Pipe
4.3.1 Precautions when installing the connection pipe
(1) Adhere 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. Keep number of bends as few as possible. The radius of curvature
should be as large as possible.
(2) Weld the connection pipes between indoor and outdoor unit. Please strictly follow the
requirements for welding process. Rosin joints and pin holes are not allowed.
(3) When laying the pipes, be careful not to distort them. The radius of bending parts should be
more than 200mm (8 inches). The pipes cannot be repeatedly bent or stretched, otherwise
the material will become brittle. Do not bend or stretch a section of pipe over three times.
(4) Please use a torque wrench to connect union nut on the indoor unit. See Fig. 21.
22
Heat Recovery DC Inverter VRF Multi Units
Fig.21
1) Align the expansion end of copper pipe with the center of threaded joint. Tighten the flare
nuts by hand.
2) Tighten the flare nuts with torque wrench until you hear "click" sound.
3) Use sponge to wrap the connecting pipe and joints without thermal insulation and secure it
with plastic tape.
4) A mounting support for the connection pipe is required.
5) The curvature degree of connection pipe be as large as possible, otherwise the pipe might
crack. Installation personnel should use tube bender when bending the pipe.
6) Don't forcibly stretch or pull on the pipe joint, otherwise indoor capillary or other pipes might
be damaged and lead to refrigerant leakage.
4.3.2 Y-type manifold
(1) Y-type manifold
Fig.22
(2) Y-type manifold has several pipe sections with different pipe sizes, which matches various
copper pipe sizes. Use pipe cutter to cut in the middle of the pipe section with proper pipe
size and deburr it. See Fig.23.
(3) Y-type manifold must be installed vertically or horizontally.
23
Heat Recovery DC Inverter VRF Multi Units
Fig.23
Y-type manifold
Total capacity of downstream
indoor unit(s) C (MBH)
Model
Cİ68
FQ01A/A
68˘Cİ102
FQ01B/A
102˘Cİ239
FQ02/A
239˘C
FQ03/A
(4) Manifold is isolated by insulating material that can withstand at least 120嘙C (248̧).
Manifold attached foam cannot be considered as insulating material.
4.3.3 Thermal insulation for pipeline
(1) For multi VRF system, every copper pipe should be labeled to avoid misconnection.
(2) At the manifold inlet, leave at least 500mm (20 inches) straight pipe section, and for FQ04
manifold, leave at least 800mm (31 inches).
(3) Thermal insulation for pipeline
1) To avoid condensate or water leakage on connecting pipe, the gas pipe and liquid pipe
must be wrapped with thermal insulating material and adhesive tape for insulation from
the air.
2) For heat pump unit, liquid pipe should withstand at least 70嘙C (158̧), and gas pipe
should withstand at least 120嘙C (248̧). For cooling only unit, both liquid pipe and gas
pipe should withstand at least 70嘙C (158. Example: Polyethylene foam can withstand
120嘙C (248̧) and foaming polyethylene can withstand 100嘙C (212̧).
3) Joints at indoor and outdoor units should be wrapped with insulating material. No
clearance should be left between pipe and wall. See Fig.24.
24
Heat Recovery DC Inverter VRF Multi Units
Fig.24
4) Manifold attached foam cannot be considered as insulating material.
5) When wrapping the tape, each layer should cover ½ the width of the tape of the previous
layer. Don’t wrap the tape too tightly, otherwise the insulation effect will be weakened.
6) After wrapping the pipe, use sealing material to completely fill the hole to prevent wind
and rain from 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 inches).
(2) To prevent accidental damage a pinch board should be added if the pipeline exceeds 1m
LQFKHV
4.4 Air Purging and Refrigerant Charge
4.4.1 Air purging
(1) Confirm outdoor liquid and gas valves are closed. Attach vacuum pump to nozzle located
on liquid and gas valves. See Fig.25.
(2) When there are more than 2 outdoor units confirm outdoor oil balance valves are closed.
See Fig.26.
25
Heat Recovery DC Inverter VRF Multi Units
Fig.25
Fig.26
4.4.2 Additional refrigerant
Outdoor unit has been charged with refrigerant before delivery.
Charge additional refrigerant for field-installed connecting pipe. If the pipeline is longer than
1m (39 inches), please refer to the following table for charging amount of refrigerant. (Liquid pipe
prevails)
How much additional refrigerant should be charged?
Total refrigerant charging amount R= Pipeline charging amount A + ∑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 (inch) of liquid pipe
Diameter of liquid pipe
28.6(1-1/8)
25.4(1)
22.2(7/8)
19.05(3/4)
26
15.9(5/8)
mm(inch)
12.7(1/2)
9.52(3/8)
6.35(1/4)
Heat Recovery DC Inverter VRF Multi Units
kg/m
0.680
0.520
0.350
0.250
0.170
0.110
0.054
0.022
OZ/inch
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)
IDU/ODU rated
capacity collocation
ratio C
50%≤C≤90%
90%˘C≤105%
105%˘C≤135%
Rated Capacity(1000Btu/h)
Quantity of included
IDUs(N)
72
96
120
N˘4
0
0
0
Nı4
0.5(1.1)
0.5(1.1)
0.5(1.1)
N˘4
1(2.2)
1(2.2)
1.5(3.3)
8˚Nı4
2(4.4)
2(4.4)
3(6.6)
Nı8
4(8.8)
3.5(7.7)
4(8.8)
N˘4
2(4.4)
2(4.4)
2.5(5.5)
8˚Nı4
4(8.8)
3.5(7.7)
4(8.8)
Nı8
4.5(9.9)
4.5(9.9)
5(11.0)
For example:
The OUD is composed of 3 modules: V5BV-R72WMBK, V5BV-R120WMBK, and
V5BV-R120WMBK. The IDUs are made up of 7sets of BDDH-14.0(48)SAK.
IDU/ODU rated capacity collocation ratio C= 48×7/(72+120+120)=108%.The quantity of
included IDUs is more than 4 sets. Please refer to the above table.
Refrigerant charging amount B for V5BV-R72WMBKmodule is 4.0kg (8.8pounds).
Refrigerant charging amount B for V5BV-R120WMBKmodule is 4.0kg (8.8pounds).
Refrigerant charging amount B for V5BV-R120WMBKmodule is 4.0kg (8.8pounds).
So, Σ Refrigerant charging amount B of every module=4.0+4.0+4.0=12kg (8.8+8.8+8.8
=26.4pounds).
Suppose the Pipeline charging amount A=Σ Liquid pipe length × refrigerant charging amount
of every 1m (39.37inch) liquid pipe=25kg (55.1 pounds)
Total refrigerant charging amount R=25+12=37kg (55.1+26.4=81.5pounds).
After confirming that there is no leakage from the system, when the compressor is not in
operation, charge additional R410A specified to the unit through the liquid pipe valve of the
outdoor unit. If required additional refrigerant cannot be quickly filled for increase of pressure in the
pipe, set the unit at cooling startup and then fill the refrigerant from gas valve of outdoor unit. If
ambient temperature is low, the unit can’t be set to cooling mode, but only to heating mode.
27
Heat Recovery DC Inverter VRF Multi Units
4.5 Electric Wiring
4.5.1 Wiring precautions
WARNING
(1) All parts, materials, and electric work should be in accordance with local and national codes.
(2) Rated voltage and dedicated power supply should be used.
(3) Power cord should be securely attached. Never forcibly pull the power cord.
(4) Power cord should be sufficiently sized for voltage. Damaged power cord and connecting wire should be
replaced by appropriate cable.
(5) All the electrical work should be performed by professional personnel as per local law, regulation and this
manual.
(6) Connect the unit to the dedicated grounding device and make sure it is secure.
(7) Air switch and circuit breaker are required. Air switch should have both magnetic trip and thermal trip
functions so as to protect the unit if short-circuit or overload occurs. D-type breaker should be used.
(8) Wiring diagram attached on the unit should be followed.
4.5.2 Wiring of power cord
Every unit should have corresponding circuit breaker and overload protection. A main switch
is required to control power supply. See Fig.34.
Fig.27
28
Heat Recovery DC Inverter VRF Multi Units
Outdoor Unit
A
Minimum Circuit
Ampacity
A
Maximum Overcurrent
Protection
A
208V/230V 3~ 60Hz
45
30
45
96 / 28
208V/230V 3~ 60Hz
70
45
70
120 / 33.5
208V/230V 3~ 60Hz
100
74
100
144 / 44.8
208V/230V 3~ 60Hz
70
55
70
168 / 50.4
208V/230V 3~ 60Hz
90
70
90
192 / 55.9
208V/230V 3~ 60Hz
125
99
125
216 / 61.5
208V/230V 3~ 60Hz
125
111
125
240 / 67
208V/230V 3~ 60Hz
150
140
150
264 / 78.4
208V/230V 3~ 60Hz
150
123
150
288 / 84
208V/230V 3~ 60Hz
150
136
150
312 / 89.5
208V/230V 3~ 60Hz
175
164
175
336 / 95
208V/230V 3~ 60Hz
200
177
200
360 / 100.5
208V/230V 3~ 60Hz
225
205
225
Outdoor unit cooling
capacity MBH / kW
Power Supply
Fuse Capacity
V/ Ph /Hz
72 / 22.4
WARNING
(1) Specification of circuit breaker and power cord based on the unit’s maximum power (max. current).
(2) Specification of power cord is based on the working condition where ambient temperature is 40 嘙C (104
̧) and multi-core cable with copper conductor(working temperature is 90 嘙C (194̧), e.g. power cable
with YJV cross-linked copper, insulated PE and PVC sheath) is lying on the surface of slot. If working
condition is different, please adjust according to national standard.
(3) Copper-core cable must be used.
(4) The above sectional area is suitable for a maximum distance of 15m (49 feet). If it’s over 15m (49 feet),
sectional area must be expanded to prevent overload current from burning the wire or causing fire hazard.
(5) Specification of circuit breaker is based on the working condition where the ambient temperature of circuit
breaker is 40嘙C (104̧). If working condition is different, please adjust according to national standard.
(6) The air switch should include magnetic trip function and thermal trip function so that system can be
protected from short circuit and overload.
(7) An all-pole disconnect switch having a contact separation of at least 3mm (1/8inch) in all poles should be
connected with fixed wiring.
4.5.3 Connection of power cord
WARNING
(1) Before accessing terminals, all supply circuits must be disconnected.
29
Heat Recovery DC Inverter VRF Multi Units
(2) If units are type I electrical appliances, they must be reliably grounded.
(3 Ground resistance must be in accord with requirements of local standard.
(4) The green-yellow wire within units is the ground wire. Do not use it for other purposes. Nor should it be cut
off or secured by tapping screws. Otherwise, it may cause electric shock.
(5) Power supply must have reliable ground terminal. Do not connect ground wire to the following places:
1) Water pipe.
2) Gas pipe.
3) Drainage pipe.
4) Other places that are considered unreliable.
(6) Power cord and communication wire should be separated, with a distance of more than 20cm (8 inches).
Otherwise, system’s communication may not work.
Steps and illustrations of power cord connection:
(1) Knock out the opening that’s used for leading the external power cord. Place the rubber
ring on the opening. Then lead the cable through the opening. Connect L1, L2, L3 of
power cord and ground wire separately to the wiring board (for power supply) that are
marked with L1, L2, L3 and the ground screw.
(2) Use cable ties to secure the cable.
(3) Lead the power cord as instructed in the graphic below:
30
Heat Recovery DC Inverter VRF Multi Units
Fig. 28
4.6 System Communication
4.6.1 Communication system include:
(1) Communication among outdoor basic modules.
(2) Communication between ODU and IDU.
(3) Communication among IDUs.
(4) Communication between IDU and wired controller.
(5) Connection between IDU and light board receiver.
(6) Communication between different refrigeration systems.
31
Heat Recovery DC Inverter VRF Multi Units
(7) Graphics of general communication connection.
Fig.29
4.6.2 Communication mode of V5 Modular DC Inverter Units
CAN bus mode is used for communication between IDU and ODU and communication among
IDUs.
4.6.3 Selection and connection mode of V5 communication material
4.6.3.1Select communication material
NOTICE! If air conditioners are installed in places where there’s strong electromagnetic
interference, the communication wire of IDU and wired controller must be shielded and the
communication wire between IDU and IDU/ODU must use shielded twisted pair.
(1)Select communication wire between IDU and wired controller
32
Heat Recovery DC Inverter VRF Multi Units
Material type
Light/Ordinary
polyvinyl chloride
sheathed cord.
Total length of
communication line
between IDU unit and
wired controller L
m(feet)
Lİ250(820)
Wire size
2×AWG18~
2×AWG16
Remarks
1. Total length of communication line can't exceed
250m (820 feet).
2. The cord shall be Circular cord (the cores shall
be twisted together).
3. If unit is installed in places with intense
electromagnetic field or strong interference, it is
necessary to use shielded wire.
Graphic of connection between IDU and wired controller
Fig.30
(2)Select communication wire between ODU and IDU
Material Type
Light/Ordinary
polyvinyl chloride
sheathed cord.
Total Length L(m) of
Communication Cable
between IDU Unit and
IDU (ODU ) Unit
m(feet)
Lİ1000(3280)
Wire size
Remarks
ı2×AWG18
1. If the wire diameter is enlarged to 2 ×AWG16,
the total communication length can reach 1500m
(4921 feet).
2. The cord shall be Circular cord (the cores shall
be twisted together).
3. If unit is installed in places with intense
electromagnetic field or strong interference, it is
necessary to use shielded wire.
Fig.31
NOTE˖All of the selected communication wire must be consistent with local laws and regulations.
33
Heat Recovery DC Inverter VRF Multi Units
4.6.3.2 Connection mode of communication
(1) All communication wires of V5 must be connected in series.
Fig.32
34
Heat Recovery DC Inverter VRF Multi Units
Fig.33
35
Heat Recovery DC Inverter VRF Multi Units
Fig.34
Fig.35
(2) All communication wires of V5 are connected by screws.
Fig.36
(3) It is preferred that single communication wires be used. If a single wire is too short,
another wire may be welded or pressure welded to it. DO NOT simply twist the wires together.
4.6.4 Communication address
Auto addressing technology is used for V5 IDU and ODU. No need to set address codes
manually. Only the addresses of master unit and central control are needed to be set (address of
central control is only needed when there are multiple refrigeration systems).
36
Heat Recovery DC Inverter VRF Multi Units
NOTICE! When installing remote monitor or central controller, you must input the
name and address code for each IDU into the software manually. For detail operation
methods, please refer to the V5 Installation and Maintenance Manual.
4.7 Connection Method and Steps for System Communication
4.7.1 Communication connection between IDU and ODU
NOTICE! The centralized controller can be installed as needed.
Connect IDU and ODU via terminal D1/D2 of wiring board XT2. Below are the connection
graphics for a single unit and for modular units:
Fig.37 Connection of communication for single-module system and single-module converter
system
37
Heat Recovery DC Inverter VRF Multi Units
Fig.38 Connection of communication for single-module system and multi-module converter system
38
Heat Recovery DC Inverter VRF Multi Units
Fig.39 Connection of communication for multi-module system and multi-module converter system
(1)If there are multiple outdoor modules, then the master unit must be the first outdoor module on the
communication wire and should not connect with IDU (master unit is set by SA8 of the outdoor main
board).
(2) If there are multiple outdoor modules, then indoor units must be connected with the last slave module of
ODU (slave module is set by SA8 of the outdoor main board).
(3) Communication wire and power cord must be separated.
(4) Communication wire must be a single cord. Splicing is not allowed.
(5) IDUs must be connected in series. The last IDU must be connected with the communication matched
resistance (supplied in the list of ODU spare parts).
39
Heat Recovery DC Inverter VRF Multi Units
4.7.2 Communication connection between IDU and wired controller
There are 4 kinds of connection between IDU and wired controller, as shown below:
Fig.40 One wired controller controls one IDU
Fig.41 Two wired controller controls one
40
Heat Recovery DC Inverter VRF Multi Units
Fig.42 One wired controller controls multiple IDUs
Fig.43 Two wired controllers control multiple IDUs
When two wired controllers control multiple IDUs, the wired controller can be connected to
any single IDU, provided that the connected IDU is of the same series. Meanwhile, one and only
one of the wired controllers must be set as a slave controller. At most 16 IDUs can be controlled by
wired controllers and the connected IDUs shall be within a same IDU network.
No matter if unit is turned on or off, slave controller can be set.
How to set a slave controller: hold “function” button on the designated controller for 5s, and
temperature display changes to C00. Continue holding “function” button for 5s and parameter
code P00 displays.
Press
button or
button to select parameter code P13. Press “mode” button to switch
to setup of parameter values. Then the parameter value will blink. Press
button or
button
to select code 02. And then press “confirm/cancel” to finish setting.
Continue to press “confirm/cancel” to return to the previous display until you exit from the
setup of parameter values.
Below are user’s parameter settings:
Parameter
code
Parameter
name
P13
Set up
address for
wired
controller
Parameter scope
Default
value
Remark
01
When 2 wired controllers control one or
more IDUs, they must have different
addresses. Slave wired controller (02) can
only set up parameters for its own address.
01: master wired
controller
02: slave wired
controller
41
Heat Recovery DC Inverter VRF Multi Units
4.7.3 Communication connection between duct type IDU and light board receiver
When the duct type IDU needs to be connected to light board remote receiver, it can be
connected via Dsp1 and Dsp2 on the IDU main board.
IDU type
Connection wire
Main board interface of corresponding IDU
Duct type IDU
Between boards (17-core)
Dsp1 (direct to 8-core interface)
Dsp2 (direct to 9-core interface)
Fig.44
(1) Wired controller and light board remote receiver can be used at the same time.
(2) When light board remote receiver is used, please use remote controller at the same time.
42
Heat Recovery DC Inverter VRF Multi Units
4.7.4 Communication connection of central controlling units
NOTICE! The centralized controller can be installed when desired.
Port connection G1 and G2 on the wiring board XT2 of master unit among each multi VRF
system (see below)
Fig.45
43
Heat Recovery DC Inverter VRF Multi Units
4.8 External Electrical Wiring Diagram
Each unit should be equipped with a circuit breaker for short circuit and overload protection. A
separate circuit breaker shall be provided to connect or disconnect power of the entire system.
4.8.1 External wiring diagram of a single unit
Fig.46
NOTICE! Maximum number of IDU is based upon ODU capacity. For details, please refer to
44
Heat Recovery DC Inverter VRF Multi Units
the introduction of units’ combination.
4.8.2 External wiring diagram of modular connection
Fig.47
NOTICE! Maximum number of ODU (N) and maximum number of IDU (n) are based on the
combination type of ODU. For details, please refer to the introduction of units’
combination.
45
Heat Recovery DC Inverter VRF Multi Units
5 Check Items after Installation and Trial Run
5.1 Check Items after Installation
The unit is installed securely?
Gas leakage test is taken or not?
Unit is properly insulated?
Does the unit drain well?
Is the voltage in accordance with the rated
voltage specified on the nameplate?
Is the electric wiring and pipe connection
installed correctly?
Unit is securely grounded?
Power cord meets the required
specification?
Is the air inlet/outlet blocked?
Possible conditions due to improper
installation
Unit may fall, vibrate or emit noise
Insufficient cooling (heating) capacity
There may be condensation and dripping.
There may be condensation and dripping.
Unit may have malfunction or
components may get damaged.
Unit may have malfunction or
components may get damaged.
Electrical short
Unit may have malfunction or
components may get damaged.
Insufficient cooling (heating) capacity
Length of refrigerant pipe and the charging
amount of refrigerant are recorded or not?
The refrigerant charging amount is not
accurate.
Is the address code of outdoor modules and the
module quantity correct?
Does the wired controller connected properly and
are all indoor units address codes accurate?
Has the communication line been connected
correctly?
The unit cannot run normally. Communication
malfunction might occur.
The unit cannot run normally. Communication
malfunction might occur.
The unit cannot run normally. Communication
malfunction might occur.
The unit cannot run normally. The unit might be
damaged.
The unit cannot run normally. Phase sequence
error may occur.
Check items
Is the piping connection and valve status correct?
Does the external power cord sufficient for
electrical voltage?
Check
5.2 Trial Run
Note: during debugging, one AND ONLY ONE module must be set as a master module.
During debugging, one AND ONLY ONE IDU must be set as a master IDU.
When no special requirement is needed, there’s no need to set other functions. Unit can
operate according to default settings. When special function is needed, please read the Service
Manual or Debugging and Maintenance Manual.
5.2.1 Preparation before trial run
(1) The power supply should be turned on only after the installation is complete.
(2) Check that all the control wires and cables are connected correctly and safely. Completely
open the gas and liquid valves.
(3) All the objects like metal filings and other debris should be cleared away after installation.
(4) Check if the unit and piping system has been damaged due to transportation.
(5) Check the terminals of electrical element and the phase sequence.
(6) Check the valve: For single-module unit, fully open the gas and liquid valve and close oil
balance valve. For dual/three module unit, fully open the gas, liquid valve and oil balance
valve.
46
Heat Recovery DC Inverter VRF Multi Units
5.2.2 Trial run
5.2.2.1 Notices
(1) Before test operation, make sure unit is power on and compressor has been preheated for
more than 8 hours. Touch the compressor to check whether it’s noticeably preheated.
Staring the test operation without preheating the compressor might cause damage.
Debugging must be performed by professional technicians.
Fig.48
(2) When debugging starts, system will operate according to the ambient temperature.
1) When outdoor temperature is above 20嘙C (68°F), debugging shall be in cooling mode.
2) When outdoor temperature is below 20嘙C (68°F), debugging shall be in heating mode.
(3) Before debugging, confirm again whether the cut-off valve of each basic module is fully
turned on.
(4) During debugging, front panel of the outdoor unit must be fully closed; otherwise,
debugging accuracy will be affected (see below).
Fig.49
(5) Before debugging, make sure the appropriate amount of refrigerant has been added to the
pipe (at least 70% of the required refrigerant must be added).
(6) Description of each stage of debugging stage:
Description of each stage of debugging progress
——
Debugging code
Progress code
Status code
47
Meaning
Heat Recovery DC Inverter VRF Multi Units
LED1
Stage
LED2
LED3
Code
Display
status
Code
Display
status
Code
Display
status
db
On
01
On
A0
On
System is not debugged.
db
On
01
On
CC
On
Master unit hasn’t been set. Please set it.
db
On
01
On
CF
On
Master unit is two or more than two. Please
reset.
db
On
01
On
OC
On
Master unit has been set successfully. Next
step will start automatically.
db
On
02
On
Ad
Blink
System is allocating addresses.
db
On
02
On
L7
Blink
No master indoor unit. Please the maser indoor
unit. If master indoor unit is not set within 1min,
the system will set it randomly.
db
On
02
On
OC
On
Address allocation is finished. Next step will
start automatically.
03_Confirm
the quantity
of module
db
On
03
On
01~04
Blink
LED3 displays the quantity of module. In this
case, please confirm if the quantity is correct
manually.
db
On
03
On
OC
On
System has confirmed the quantity of module.
Next step will start automatically.
04_Confirm
the quantity
of IDU
db
On
04
On
01~80
Blink
LED3 displays the quantity of IDU. In this case,
please confirm if the quantity is correct
manually.
db
On
04
On
OC
On
System has confirmed the quantity of IDU.
Next step will start automatically.
db
On
05
On
C2
On
Communication between master ODU and
inverter compressor driver has error.
db
On
05
On
C3
On
Communication between master ODU and
inverter fan driver has error.
db
On
05
On
CH
On
Rated capacity ratio between IDU and ODU is
too high.
db
On
05
On
CL
On
Rated capacity ratio between IDU and ODU is
too low.
db
On
05
On
OC
On
System detection is done. Next step will start
automatically.
01_ Set
master unit
02_ Allocate
addresses
05_Internal
communicati
on detection
Description of each stage of debugging progress
——
Stage
06_Detect
outdoor
components
07_Detect
indoor
components
08_Confirm
Debugging code
Progress code
Status code
LED1
LED2
LED3
Code
Display
status
db
db
Meaning
Code
Display
status
Code
Display
status
On
06
On
Relate
d error
code
On
System detects that outdoor components have
error.
On
06
On
OC
On
System detects no error on outdoor
components. Next step will start automatically.
On
System detects error on indoor components.
XXXX means the project code of IDU with
error. 3s later, related error code will be
displayed. For instance, if no.100 IDU has d5
error, then the LED3 will display circularly as
below: 01(2s later), 00(2s later), d5.
db
On
07
On
XXXX/
Relate
d error
code
db
On
07
On
OC
On
System detects no error on indoor
components. Next step will start automatically.
db
On
08
On
U0
On
Preheat time for compressor is less than 8
48
Heat Recovery DC Inverter VRF Multi Units
preheated
compressor
hours.
db
On
08
On
OC
On
Compressor has been preheated for 8 hours.
Next step will start automatically.
09_Refrigera
nt judgments
before
startup
db
On
09
On
U4
On
System is lack of refrigerant. System stops with
balance equalizing pressure lower than
0.3Mpa.
db
On
09
On
OC
On
Refrigerant is normal. Next step will start
automatically.
10_Status
judgments of
outdoor
valves
before
startup
db
On
10
On
ON
On
Outdoor valves are being inspected.
db
On
10
On
U6
On
Outdoor valves are not fully opened.
db
On
10
On
OC
On
Outdoor valves open normally.
The refrigerant charging amount status is in
manual calculation status (additional
refrigerant charging amount must be
calculated correctly and recorded).
11_Calculat
e refrigerant
charging
amount
status
manually
db
On
11
On
AE
On
db
On
12
On
AP
Blink
db
On
12
On
AE
On
13_
——
——
——
——
——
——
No meaning.
14_
——
——
——
——
——
——
No meaning.
db
On
15
On
AC
On
Debugging for cooling mode. (Debugging
operation mode, the system will select
automatically with no need of manual setting).
db
On
15
On
Relate
d error
code
On
Malfunction occurs when debugging for cooling
mode.
db
On
15
On
J0
On
Malfunction of other module occurs when
debugging for cooling mode.
db
On
15
On
U9
On
Pipeline or valve of outdoor unit is faulty.
12_Confirm
debugging
startup
15_Cooling
debugging
16_Heating
debugging
Ready for units to start debugging.
The unit has been set in debugging operation
status of manual calculation of refrigerant
charging amount.
db
On
15
On
XXXX/
U8
On
System detects error on indoor pipeline. XXXX
means the project code of IDU with error. 3s
later, U8 will be displayed. For instance, if
no.100 IDU has U8 error, then the LED3 will
display circularly as below: 01(2s later), 00(2s
later), U8.
db
On
16
On
AH
On
Debugging for heating mode. (Debugging
operation mode, the system will select
automatically with no need of manual setting).
db
On
16
On
Relate
d error
code
On
Malfunction occurs when debugging for
heating mode.
db
On
16
On
J0
On
Malfunction of other module occurs when
debugging for heating mode.
db
On
16
On
U9
On
Pipeline or valve of outdoor unit is faulty.
On
System detects error on indoor pipeline. XXXX
means the project code of IDU with error. 3s
later, U8 will be displayed. For instance, if
no.100 IDU has U8 error, then the LED3 will
display circularly as below: 01(2s later), 00(2s
later), U8.
db
On
16
On
XXXX/
U8
49
Heat Recovery DC Inverter VRF Multi Units
17_Debuggi
ng
01~04
completion
status
On
OF
On
Debugging operation has been done and the
unit is in standby status. LED1 displays module
address. LED2 and LED3 display “OF”.
On
OF
5.2.2.2 Debugging operation mode
V5 multi VRF system has two debugging modes: one is direct operation on main board of
outdoor units while the other is PC operation via special software. In PC software debugging,
indoor/outdoor parameters can be displayed and historical data can be recorded and queried.
(Operation details can be found in software instruction manuals)
(1)Debugging through operation on main board of outdoor units
In this debugging mode, the following debugging functions are included on the main board:
Step 1: front panel of the outdoor units must be fully closed. Open the debugging window of
each basic module;
Step 2: disconnect power for outdoor units. According to design requirements of external
static pressure, set up corresponding static pressure mode for the units. Setting methods can be
seen in Outdoor Fan Static Pressure Setup SA6_ESP_S;
Step 3: disconnect power for outdoor units and set one module as a master unit. Setting
methods can be seen in Master Unit Setup SA8_MASTER_S;
Step 4: Connect power for all indoor units. Make sure all IDUs are power on. Then all outdoor
modules will display “Debugging not enabled”;
Step 5: Find the module with “01” module address to be the master module. Hold SW7 button
on the master module for at least 5s to enable debugging;
Step 6: Wait. Unit will then start stage 01 and 02; in stage 01, if master unit is not correctly set,
stage 01 will show the following errors:
Stage
01_01 Set
up master
unit:
Debugging
Code
Progress Code
Status Code
LED1
LED2
LED3
Display
Code
status
Meaning
Code
Display
status
Code
Display
status
System doesn’t have master unit. Reset
master unit.
db
light
01
light
CC
light
db
light
01
light
CF
light
More than 2 master units are set. Reset
master unit.
db
light
01
light
OC
light
Master unit is successfully set. Start next
stage.
According to the above errors, reset the master unit as instructed in Master Unit Setup
SA8_MASTER_S. After reset is finished, start debugging again.
In stage 02, if master IDU is not detected, then stage 02 will show the following errors:
LED1
LED2
LED3
Function code
Display mode
Current stage
Display mode
Current status
Display mode
db
light
02
light
L7
blink
At this time, all buttons are ineffective. Set master IDU in 1min via debugging software. If
50
Heat Recovery DC Inverter VRF Multi Units
master IDU is not set in 1min, system will set up a master IDU randomly. Next, system will start
next stage.
Step 7: in stage 03, the quantity of modules needs to be confirmed manually. Main board of
each module will display:
Debugging code
Stage code
Status code
LED1
LED2
LED3
Stage
03_Quantity of
modules
Code
Display
status
Code
Display
status
Code
Display
status
db
light
03
light
Quantity of
modules
blink
If the quantity displayed is the same with actual quantity, then press SW7 confirmation button
on the master unit to confirm it. Unit will start next stage:
Debugging code
Stage code
Status code
LED1
LED2
LED3
Stage
03_Confirm the
quantity of
modules
Code
Display
status
Code
Display
status
Code
Display
status
db
light
03
light
OC
light
If the quantity displayed is different from actual quantity, then disconnect power and check
whether communication wire among each module is correctly connected. After the check, start
debugging again.
Step 8: in stage 04, the quantity of IDUs needs to be confirmed manually. Main board of each
module will display:
Debugging code
Stage code
Status code
LED1
LED2
LED3
Stage
04_Confirm the
quantity of IDUs
Code
Display
status
Code
Display
status
Code
Display
status
db
Light
04
Light
Quantity of
connected
IDUs
blink
If the quantity displayed is the same with actual quantity, then press SW7 confirmation button
on the master unit to confirm it. Unit will start next stage:
Debugging code
Stage code
Status code
LED1
LED2
LED3
Stage
04_Confirm the
quantity of IDUs
Code
Display
status
Code
Display
status
Code
Display
status
db
Light
04
Light
OC
Light
Step 9: stage 05 is “Detect internal communication”
If no error is detected, system will display as below and then start next stage.
51
Heat Recovery DC Inverter VRF Multi Units
——
Debugging code
Stage code
Status code
LED1
LED2
LED3
Stage
05_Detect
internal
communication
Code
Display
status
code
Display
status
Code
Display
status
db
Light
05
Light
OC
Light
Meaning
Detection is finished. Start next stage.
If error is detected, system will stay at current stage. Error has to be solved manually. Below
are relevant errors:
——
Debugging code
Stage code
Status code
LED1
LED2
LED3
Stage
05_Detect
internal
communication
Meaning
Code
Display
status
code
Display
status
Code
Display
status
db
Light
05
Light
C2
Light
System detects “driven communication
error between master unit and inverter
compressor”.
db
Light
05
Light
C3
Light
System detects “driven communication
error between master unit and inverter
fan”.
db
Light
05
Light
CH
Light
IDU/ODU “high proportion of rated
capacity”.
db
Light
05
Light
CL
Light
IDU/ODU “low proportion of rated
capacity”.
Elimination methods of above errors can be found in Troubleshooting.
Step 10: stage 06 is “Detect outdoor components”
If no error is detected, system will display as below and then start next stage.
——
Debugging code
Stage code
Status code
LED1
LED2
LED3
Stage
06_Detect
outdoor
components
Code
Display
status
code
Display
status
Code
Display
status
db
Light
06
Light
OC
Light
Meaning
No error is detected in outdoor
components. Start next stage.
If error is detected, system will stay at current stage. Error has to be corrected manually.
Below is relevant error:
——
Debugging code
Stage code
Status code
LED1
LED2
LED3
Stage
Code
06_Detect
outdoor
components
db
Display
status
Light
code
06
Display
status
Code
Display
status
Light
Erro
r
cod
e
Light
52
Meaning
System detects error in outdoor
components.
Heat Recovery DC Inverter VRF Multi Units
Elimination methods of above error can be found in Troubleshooting.
Step11: stage 07 is “Detect indoor components”
If no error is detected, system will display as below and then start next stage.
——
Debugging code
Stage code
Status code
LED1
LED2
LED3
Stage
07_Detect indoor
components
Meaning
Code
Display
status
code
Display
status
Code
Display
status
db
Light
07
Light
OC
Light
No error is detected in indoor
components. Start next stage.
If error is detected, system will stay at current stage. Error has to be corrected manually.
Below is relevant error:
——
Debugging code
Stage code
Status code
LED1
LED2
LED3
Stage
Code
07_Detect indoor
components
db
Display
status
Light
code
07
Display
status
Code
Display
status
Light
XXXX
or
Error
code
Light
Meaning
System detects error in indoor
components.
XXXX is the project no. of the faulty IDU. 3s later, relevant error code is displayed. For
example, IDU no. 100 has d5 error, then LED3 displays like this: 01 (2s later) 00 (2s later) d5, and
repeat again.
Elimination methods of above error can be found in Troubleshooting.
Step 12: stage 08 is “Confirm preheated compressor”
If more than 8h of preheat time is detected, system will display as below and start next stage.
——
Debugging code
Stage code
Status code
LED1
LED2
LED3
Stage
08_Confirm
preheated
compressor
Code
Display
status
code
Display
status
Code
Display
status
db
Light
08
Light
OC
Light
Meaning
Preheat time for compressor is 8h.
Start next stage.
If less than 8h of preheat time is detected, system will give error alarm and display as below.
You CAN press SW7 confirmation button to skip the wait time and start next stage, BUT this will
force start the compressor, which may cause damage.
——
Debugging code
Stage code
Status code
Stage
LED1
LED2
LED3
Meaning
53
Heat Recovery DC Inverter VRF Multi Units
08_Confirm
preheated
compressor
Code
Display
status
code
Display
status
Code
Display
status
db
Light
08
Light
UO
Light
Preheat time for compressor is less
than 8h.
Step 13: stage 09 is “Refrigerant check before startup”
If the refrigerant quantity meets the requirement of operation startup, system will display as
below and start next stage.
——
Debugging code
Stage code
Status code
LED1
LED2
LED3
Stage
09_Refrigerant
check before
startup
Code
Display
status
code
Display
status
Code
Display
status
db
Light
09
Light
OC
Light
Meaning
System refrigerant is normal. Start next
stage.
If there’s not enough refrigerant in the system, system will display U4 “refrigerant shortage
protection.” Check if there’s any leakage and add refrigerant until error eliminated.
——
Debugging code
Stage code
Status code
LED1
LED2
LED3
Stage
09_Refrigerant
judgments
before startup
Code
Display
status
code
Display
status
Code
Display
status
db
Light
09
Light
O4
Light
Meaning
System refrigerant is low. System
downtime equilibrium pressure is lower
than 0.3MPa(4-2/5psig).
Step 14: stage 10 is “Status check of outdoor valves before startup”
If master unit displays below, status judgments are enabled.
——
Debugging code
Stage code
Status code
LED1
LED2
LED3
Stage
10_Status check
of outdoor valves
before startup
Code
Display
status
code
Display
status
Code
Display
status
db
Light
10
Light
ON
Light
Meaning
Outdoor valves are being turned on.
If unit detects that valve status is not normal, it will display as below:
——
Debugging code
Stage code
Status code
LED1
LED2
LED3
Stage
10_Status check
of outdoor valves
before startup
Code
Display
status
code
Display
status
Code
Display
status
db
Light
10
Light
U6
Light
54
Meaning
Outdoor valves are not fully turned on.
Heat Recovery DC Inverter VRF Multi Units
Then check the big and small valves whether they are fully turned on. After the check, press
SW6 return button to restart the judgments.
If unit detects that valve status is normal, it will display as below and start next stage.
——
Debugging code
Stage code
Status code
LED1
LED2
LED3
Stage
10_Status check
of outdoor valves
before startup
Code
Display
status
code
Display
status
Code
Display
status
db
Light
10
Light
OC
Light
Meaning
Outdoor valves are turned on normally.
Step 15: stage 11 is “Calculate refrigerant quantity manually”
No need to operate. System will start next stage.
Step 16: stage 12 is “Confirm debugging startup”
In order to make sure all preparation work is done before startup, this step is designed for
user to confirm the startup again. Operate as below:
If master unit displays as below, system is waiting for confirmation signal.
——
Debugging code
Stage code
Status code
LED1
LED2
LED3
Stage
12_Status check
of outdoor valves
before startup
Code
Display
status
code
Display
status
Code
Display
status
db
Light
12
Light
AP
Blink
Meaning
Ready for units to start debugging.
If it’s confirmed, press SW7 confirmation button. Unit will display as below and start next
stage.
——
Debugging code
Stage code
Status code
LED1
LED2
LED3
Stage
12_Status check
of outdoor valves
before startup
Code
Display
status
code
Display
status
Code
Display
status
db
Light
12
Light
AE
Light
Meaning
Manual calculation of refrigerant
quantity is set up.
Step 17: after unit has started debugging, system select cooling/heating mode according to
ambient temperature.
A If cooling mode is selected, display is as below:
——
Debugging code
Stage code
Status code
LED1
LED2
LED3
Stage
Code
Display
status
code
Display
status
Code
55
Display
status
Meaning
Heat Recovery DC Inverter VRF Multi Units
15_Cooling
debugging
db
Light
15
Light
AC
Light
Debugging is enabled in cooling mode
(debugging mode, automatically
selected by system).
db
Light
15
Light
Error
code
Light
Error occurs during debugging in
cooling mode.
db
Light
15
Light
J0
Light
Error of other modules occurs during
debugging in cooling mode.
db
Light
15
Light
U9
Light
Outdoor pipeline and valves are not
operating normally.
Light
System detects error in indoor
pipeline. XXXX is the project no. of
the faulted IDU. 3s later, error code
U8 is displayed. For example, IDU no.
100 has U8 error, then LED3 displays
like this: 01 (2s later) 00 (2s later) U8,
and repeat again.
db
Light
15
Light
XXXX
/U8
B If heating mode is selected, relevant display is as below:
——
Debugging code
Stage code
Status code
LED1
LED2
LED3
Stage
16_Heating
debugging
Meaning
Code
Display
status
code
Display
status
Code
Display
status
db
Light
16
Light
AE
Light
db
Light
16
Light
Error
code
Light
Error occurs during debugging in
heating mode.
db
Light
16
Light
J0
Light
Error of other modules occurs during
debugging in heating mode.
db
Light
16
Light
U9
Light
Outdoor pipeline and valves are not
operating normally.
Light
System detects error in indoor
pipeline. XXXX is the project no. of
the faulted IDU. 3s later, error code
U8 is displayed. For example, IDU no.
100 has U8 error, then LED3 displays
like this: 01 (2s later) 00 (2s later) U8,
and repeat again.
db
Light
16
Light
XXXX
/U8
Debugging is enabled in heating
mode (debugging mode,
automatically selected by system).
Step 18: if there’s no error during operation for about 40min, system will automatically confirm
that debugging is finished and then stop. System resumes standby condition and displays as
below:
——
Debugging code
Stage code
Status code
LED1
LED2
LED3
Stage
Code
17_Debugging
finished
0104
Display
status
Light
code
OF
Display
status
Light
Code
OF
Meaning
Display
status
Light
Debugging is finished. System is on
standby condition. LED1 displays
module address. LED2 and LED3
display “OF”.
Step 19: after debugging is finished, some functions can be set up according to project needs.
56
Heat Recovery DC Inverter VRF Multi Units
For specific details, please refer to System Functions Setup. If no special requirements, skip this
step.
Step 20: deliver the product to user and inform user about usage precautions.
5.2.3 Appendix: judgment reference of normal operational parameters
Reference of Debug Parameters of GMV5 DC Inverter Multi VRF System
No
.
1
2
3
4
5
6
7
8
Debug item
Parameter name
Outdoor ambient temp
Unit
Reference
ºC(°F) ——
Discharge tube temp of
● When system compressor starts up, temp of
ºC(°F)
inverter compressor 1
discharge tube or casing top in cooling mode is
within 70~95ºC (158~203°F), and at least 10
Casing top temp of
ºC(°F) ºC (18°F) higher than system high pressure
inverter compressor 1
saturation temp; Temp in heating mode is within
Discharge tube temp of
ºC(°F) 65~80ºC (149~176°F), and at least 10ºC (18°F)
inverter compressor 2
higher than system high pressure saturation temp.
● When inverter compressor starts but inverter
Casing top temp of
compressor 2 stops, the discharge tube temperature
ºC(°F)
inverter compressor 2
of inverter compressor 2 is almost the same as
ambient temp.
Defrost temp 1
System
System high pressure
ODU
parameters
System low pressure
● In cooling mode, defrost temp1 is 5~11ºC
(5~19.8°F) lower than system high pressure value;
ºC(°F)
● In heating mode, defrost temp1 is about 2ºC
(3.6°F) different from system low pressure value.
● System’s normal high pressure value is within
20~25ºC (68~77°F) According to the change in
ambient temp and system operational capacity,
system’s high pressure value is 10~40ºC (18~72°F)
higher than ambient temp The higher ambient temp
is, the smaller temp difference is.
ºC(°F)
● When ambient temp is 25~35ºC (77~95°F),
system’s high pressure value in cooling mode is
44~53ºC (111.2~127.4°F).
● When ambient temp is -5~10ºC (23~50°F),
system’s high pressure value in heating mode is
40~52ºC (104~125.6°F).
● When ambient temp is 25~35ºC(77~95°F),
system’s low pressure value in cooling mode is
0~8ºC(32~46.4°F).
ºC(°F)
● When ambient temp is -5~10ºC(23~50°F),
system’s low pressure value in heating mode is
-15~5ºC(5~41°F).
● In cooling mode, heating electronic expansion
valve remains 480PLS.
● In heating mode, the opening angle of adjustable
electronic expansion valve varies within
120~480PLS.
9
Opening angle of
heating EXV
10
Operating freq. of
inverter compressor 1
Hz
Varies from 20Hz to 95Hz
11
Current of inverter
compressor 1
A
According to different operating freq. and different
load, current will vary from 7A to 40A.
12
IPM temp of inverter
compressor 1
ºC(°F)
When ambient temp is lower than 35ºC(95°F), IPM
temp is below 85ºC(185°F). Highest temp won’t be
PLS
57
Heat Recovery DC Inverter VRF Multi Units
above 95ºC(203°F).
13
Inverter compressor 1
driven bus voltage
V
Normal bus voltage is 1.414 times of power voltage.
For example, if 3-phase power voltage is 220V, then
the bus voltage after rectification is: 220V X
1.414=311V. It’s normal if actual voltage varies 15v
from the calculated voltage.
14
Operating freq. of
inverter compressor 2
Hz
Varies from 30Hz to 100Hz
15
Current of inverter
compressor 2
A
According to different operating freq. and different
load, current will vary from 7A to 25A.
16
IPM temp of inverter
compressor 2
Inverter compressor 2
driven bus voltage
17
When ambient temp is lower than 35ºC(95°F), IPM
ºC(°F) temp is below 80ºC(176°F). Highest temp won’t be
above 95ºC(203°F).
Normal bus voltage is 1.414 times of power voltage.
For example, if 3-phase power voltage is 220V , then
the bus voltage after rectification is: 220V X
1.414=311V. It’s normal if actual voltage varies 15v
from the calculated voltage.
V
Reference of Debug Parameters of V5 DC Inverter Multi VRF System
No.
Debug item
Parameter name
Unit
Operating freq of fan
motor 1
Hz
Current of fan motor 1
A
20
Operating freq of fan
motor 2
Hz
21
Current of fan motor 2
A
18
19
ODU
22
System
parameters
23
IDU
Reference
Adjusts in 0~65Hz according to system pressure.
Adjusts in 0~65Hz according to system pressure.
Ambient temp of IDU
ºC(°F) ——
Inlet tube temp of
indoor heat exchanger
ºC(°F)
● According to different ambient temp, for a same
IDU under cooling mode, inlet tube temp will be
1~7ºC (1.8~12.6°F) lower than outlet tube temp.
● For a same IDU under heating mode, inlet tube
ºC(°F) temp will be 10~20ºC (18~36°F) lower than outlet
tube temp.
24
Outlet tube temp of
indoor heat exchanger
25
Opening angle of
indoor EXV
PLS
Communication data
—
Quantity of IDU and ODU detected by software is the
same with actual quantity. No communication error.
Adjusts opening angle automatically in
200~2000PLS.
26
Communi
-cation
parameter
27
Drainage
system
——
—
IDU can drain water out completely and smoothly.
Condensate pipe has no backward slope. Water of
ODU can be drained completely through drainage
pipe. No water dripping from unit base.
28
Others
——
ºC(°F)
Compressor and indoor/outdoor fan motor has no
strange noise. Unit operates normally.
58
Heat Recovery DC Inverter VRF Multi Units
6 Common Malfunction and Troubleshooting
Check the following items before contacting for repair.
Phenomenon
The unit doesn’t
run.
Reason
Measure
No power supply connected
Connect to power supply
Voltage is too low
Check if the voltage is within rating range
Broken fuse or breaker trips off
Replace fuse or flip breaker switch
No signal from remote controller
Replace battery
Remote controller is out of control scope
Move remote to within 8m (26 feet)
Unit runs but stop Air intake or outlet of indoor or outdoor unit is
Remove obstruction
immediately
blocked
Air intake or outlet of indoor or outdoor unit is
Remove obstruction
blocked
Adjust setting at wireless remote controller
Improper temperature setting
or wired controller
Adjust setting at wireless remote controller
Fan speed is set too low
or wired controller
Adjust setting at wireless remote controller
Wind direction is not correct
or wired controller
Abnormal cooling
or heating
Door or windows are opened
Close the door or windows
Direct sunshine
Draw curtain or louver
Too many people in the room
Too many heat resources in the room
Reduce heat resources
Filter is blocked for dirt
Clean the filter
(1) When installing remote monitor or central controller, transition on indoor units’ project codes must be
made. Otherwise, there will be confusion of the project codes. For detail operation methods, please refer
to the V5 Installation and Maintenance Manual.
(2) If problem cannot be solved after checking the above items, please contact a qualified technician.
Following circumstance are not malfunction.
“Malfunction”
Unit doesn’t run
Reason
When unit is started immediately after it is just Overload protection switch requires a 3
turned off
minutes delay
When power is turned on
Standby operating for about 1 minute
Mist comes from
Under cooling
the unit
Noise is emitted
Indoor high humidity air is cooled rapidly
Slight cracking sound is heard when just
turned on
It is noise when electronic expansion
valve initialization
There is repeated sound when cooling
That's sound of gas refrigerant flowing in
unit
59
Heat Recovery DC Inverter VRF Multi Units
There is sound when unit starts or stops
That's sound of gas refrigerant flow
stopping
There is slight and continuous sound when
unit is running or after running
That's sound of the drainage system
Cracking sound is heard when unit is
operating and after turning off
That’s sound caused by expansion of
panel and other parts due to temperature
change
The unit blows out
When unit runs after a period of inactivity
dust
The unit emits
odor
The room odor absorbed by the unit is
recirculated
Operating
Indoor unit still
After every indoor unit receive "stop" signal,
runs after switch
fan will keep running
off
Mode conflict
Dust in indoor unit is blown out
COOL or HEAT mode cannot be operated
60
Indoor fan motor will keep running 20-70s
so as to take advantage of excess cooling
and heating and prepare for the next
operation
When the indoor operating mode conflicts
with that of outdoor unit, indoor fault
indicator will flash and conflict will be
shown on the wired controller after 5
minutes. Indoor unit stops. Outdoor
operating mode changes to the same as
that of indoor unit, then the unit will go
back to normal. COOL mode doesn't
conflict with DRY mode. FAN mode
doesn't conflict with any mode.
Heat Recovery DC Inverter VRF Multi Units
7 Error Indication
Inquiry method of error indication: combine division symbol and content symbol to check the
corresponding error.
For example, division symbol L and content symbol 4 together means over-current protection.
Content
symbol
Division
symbol
L
0
1
2
3
4
5
Malfunction of
IDU
Protection of
indoor fan
Auxiliary heating
protection
Water-full
protection
Abnormal power
supply for wired
controller
Freeze
prevention
protection
Indoor PCB is
poor
Malfunction of
lower water
temperature
sensor of water
tank
Malfunction of
ambient
temperature
sensor
Malfunction of
entry-tube
temperature
sensor
Indoor
d
E
Malfunction of
High-pressure
ODU
protection
Discharge
low-temperature
protection
High discharge
Low-pressure
temperature
protection
protection of
compressor
Malfunction of
discharge
temperature
sensor of
compressor 1
Outdoor
F
Main board of
ODU is poor
Malfunction of
high-pressure
sensor
J
Protection for
other modules
Over-current
protection of
compressor 1
Over-current
protection of
compressor 2
Over-current
protection of
compressor 3
Over-current
protection of
compressor 4
Over-current
protection of
compressor 5
Malfunction of
outdoor ambient
temperature
sensor
Malfunction of
defrosting
temperature
sensor 1
Malfunction of
defrosting
temperature
sensor 2
Malfunction of
liquid
temperature
sensor of
sub-cooler
Malfunction of
gas temperature
sensor of
sub-cooler
P
malfunction of
driving board
of compressor
Driving board of
compressor
operates
abnormally
Voltage
protection of
driving board
power of
compressor
Reset protection
of driving module
of compressor
Drive PFC
protection of
compressor
Over-current
protection of
inverter
compressor
H
Malfunction of Driving board of
driving board
fan operates
of fan
abnormally
Voltage
protection of
driving board
power of fan
Reset protection
Drive PFC
of driving module
protection of fan
of fan
b
Preheat time
U
of compressor
Debugging
is insufficient
C
Communicatio
n malfunction
between IDU,
ODU and
IDU’s wired
controller
Malfunction of
low-pressure
sensor
Over-current
protection of
inverter fan
Wrong address
Wrong setting of Power supply
Refrigerant-lacki
ODU’s capacity phase sequence
for driving board
ng protection
code/jumper cap protection
of compressor
Communication
malfunction
between main
control and
inverter
compressor
driver
61
Communication
malfunction
between main
control and
inverter fan
driver
Malfunction of
lack of IDU
Alarm because
project code of
IDU is
inconsistent
Heat Recovery DC Inverter VRF Multi Units
Content
symbol
Division
symbol
0
n
SE operation
setting of
system
Status
A
Unit waiting for
debugging
Content
symbol
Division
symbol
6
L
1
2
Refrigerant
recovery
operation of
after-sales
3
4
Defrosting
Oil-return
Compulsory
defrosting
7
No main IDU
8
9
5
Limit setting for
Compulsory
max.
excursion of
capacity/output engineering code
capacity
of IDU
A
H
Indoor
For single control
For single control
over multiple
Power supply is
over multiple Alarm due to bad
units, number of
insufficient
air quality
units, IDU series
IDU is
is inconsistent
inconsistent
Malfunction of
exit-tube
Malfunction of
temperature humidity sensor
sensor
Malfunction of
water
temperature
sensor
Malfunction of
jumper cap
Web address of
IDU is abnormal
PCB of wired
controller is
abnormal
F
Malfunction of
discharge
temperature
sensor of
compressor 2
Malfunction of
discharge
temperature
sensor of
compressor 3
Malfunction of
discharge
temperature
sensor of
compressor 4
Malfunction of
discharge
temperature
sensor of
compressor 5
Malfunction of
discharge
temperature
sensor of
compressor 6
Current sensor of
compressor 1 is
abnormal
J
Over-current
protection for
compressor 6
Gas-mixing
protection of
4-way valve
b
Malfunction of Malfunction of
exit tube
Malfunction of
inlet tube
Malfunction of
temperature
gas temperature
temperature
outdoor humidity
sensor of vapor
sensor of heat
sensor of
sensor
exchanger
vapor liquid liquid separator
separator
d
E
Outdoor
Debugging
P
Drive IPM
module
protection of
compressor
Malfunction of
drive
temperature
sensor of
compressor
H
Drive IPM
module
protection of
fan
Malfunction of
drive
temperature
sensor of fan
U
Alarm
because valve
is abnormal
C
Alarm
Abnormal
because ODU
communication
quantity is
of converter
inconsistent
Statu
s
A
Heat pump
function
High pressure
Low pressure
ratio protection of ratio protection of
system
system
Malfunction of
oil-return
temperature
sensor 1
Clock of system
is abnormal
Desynchronizing
protection of
inverter
compressor
Malfunction of
drive storage
chip of
compressor
High-voltage
protection of
compressor’s
drive DC bus bar
Drive IPM high Desynchronizing
temperature
protection of
protection of fan
inverter fan
Malfunction of
drive storage
chip of inverter
outdoor fan
High-voltage
protection of
fan’s drive DC
bus bar
Drive IPM high
temperature
protection of
compressor
Malfunction of
pipeline for IDU
Quiet mode
setting
Protection
because of
abnormal
pressure
Emergency
status of
compressor
Vacuum pump
mode
62
Malfunction of
pipeline for ODU
Emergency
status of fan
Emergency
Rated capacity is
status of module
too high
Heating
Heat Recovery DC Inverter VRF Multi Units
Content
symbol
6
Division
symbol
7
8
9
A
H
setting
n
Inquiry of
malfunction
Content
symbol
Division
symbol
Inquiry of
parameters
Inquiry of project Check quantity of
Heat pump unit Heating only unit
code of IDU
IDU on line
C
L
E
F
J
P
L
IDU is not
matching
with
outdoor unit
Malfunction
of water flow
switch
Rotation speed
of EC DC water
pump is
abnormal
Malfunction
of shunt
valve setting
Setting of
functional DIP
switch code is
wrong
Zero-crossing
malfunction of
PG motor
d
Setting
capacity of
DIP switch
code is
abnormal
Malfunction of
backwater
temperature
sensor
Malfunction of
inlet tube
temperature
sensor of
generator
Current
sensor of
compressor 6
is abnormal
Malfunction of
DC motor
Indoor
Malfunction
of air outlet
temperature
sensor
Malfunction of
indoor CO2
sensor
Malfunction
of upper
water
temperature
sensor of
water tank
E
Outdoor
F
Current
sensor of
compressor
2 is
abnormal
J
Water flow
switch
protection
b
P
H
U
Protection
because
the
temperature
sensor at
the top of
compressor
1 is loose
Malfunction
of current
detection
circuit drive
of
compressor
Malfunction
of current
detection
circuit of fan
drive
Setting of
main IDU is
succeeded
Debugging
C
No main
unit
Current
sensor of
compressor
3 is
abnormal
Protection
because
high
pressure is
too low
Current sensor
of compressor
4 is abnormal
Current
sensor of
compressor
5 is
abnormal
Oil-return pipe
is blocked
Oil-return
pipe is
leaking
Protection
because the
temperature
sensor at the
top of
compressor
2 is loose
Malfunction of
inlet tube
temperature
sensor of
condenser
Malfunction
of outlet
tube
temperature
sensor of
condenser
High-pressure
sensor and
low-pressure
sensor are
connected
reversely
Malfunction of
temperature
sensor of
oil-return 2
Low voltage
protection for
DC bus bar
of drive of
compressor
Phase-lacking
of inverter
compressor
Malfunction
of charging
loop of
driven of
compressor
Failure
startup of
inverter
compressor
AC current
protection of
inverter
compressor
Low voltage
protection of
bus bar of
fan drive
Phase-lacking
of inverter fan
Malfunction
of charging
loop of fan
drive
Failure
startup of
inverter fan
AC current
protection of
inverter fan
Charging of
refrigerant is
invalid
Identification
malfunction
of IDU of
mode
exchanger
Communication
malfunction
between mode
exchanger and
IDU
Malfunction
of multiple
main control
units
Address DIP
switch code of
system is
shocking
Malfunction of
multiple wired
controller
Emergency
operation
DIP switch
code of
compressor
is wrong
The
matching
ratio of rated
capacity for
IDU and
63
Heat Recovery DC Inverter VRF Multi Units
ODU is too
low
A
Cooling
n
Cooling
only unit
Charge
refrigerant
automatically
Charge
refrigerant
manually
Fan
Cleaning
reminding of
filter
Fan model
High
temperature
prevention
when heating
Status
Content
symbol
Division
symbol
Negative code
U
d
Malfunction of drainage
pipe temperature sensor
of generator
Indoor
L
Indoor unit’s branch is
not inconsistent for
one-to-more unit of heat
recovery system
b
d
n
Debugging status
Malfunction of
solar power
temperature
sensor
Malfunction of
swing parts
Debugging
confirmation
when starting
up the unit
y
E
F
Outdoor
Malfunction of
Malfunction of casing Malfunction of casing top
exit tube
top temperature sensor temperature sensor of
temperature
of compressor 1
compressor 2
sensor of mode
exchanger
Malfunction of
inlet tube
temperature
sensor of mode
exchanger
J
b
Malfunction of
temperature sensor of
oil return 3
P
AC input voltage of drive
of inverter compressor
H
AC input voltage of drive
of inverter fan
Malfunction of
temperature sensor of oil
return 4
U
Debugging
Status
C
Communication
malfunction between
IDU and the receiving
lamp
A
Long-distance
emergency stop
n
Eliminate the
long-distance shielding
command of IDU
Communication
Malfunction of
Communication
malfunction
Overflow distribution of IP
network for IDU
malfunction of
between mode
address
and ODU of
mode exchanger
exchanger and
mode exchanger
ODU
Emergency stop of
operation
Bar code inquiry
Limit operation
Child lock status Shielding status
Length
modification of
connection pipe
of ODU
Note: For detailed malfunction and maintenance, please refer to the engineering debugging
and after-sales maintenance manual.
64
Heat Recovery DC Inverter VRF Multi Units
8 Maintenance and Care
Maintenance and care should be performed every six months by professional personnel,
which will prolong the unit life span. Disconnect the power supply before cleaning and
maintenance.
8.1 Outdoor Heat Exchanger
Outdoor heat exchanger is required to be cleaned once every six months. Use vacuum
cleaner with nylon brush to clean up dust and sundries on the surface of heat exchanger. Blow
away dust by compressed air if it is available. Never use water to wash the heat exchanger.
8.2 Drain Pipe
Regularly check if the drain pipe is clogged in order to drain condensate smoothly.
8.3 Check before Seasonal Use
(1) Check if the inlet/outlet of the indoor/outdoor unit is clogged.
(2) Check if the ground wire is secured reliably.
(3) Check if battery of remote wireless controller needs to be replaced.
(4) Check if the filter screen has been set securely.
(5) After long period of shutdown, turn on main power 8 hours before startup to preheat the
compressor crankcase.
(6) Check if the outdoor unit is installed securely. If service is required, contact a qualified
technician.
8.4 Maintenance after Seasonal Use
(1) Cut off main power supply of the unit.
(2) Clean filter screen and indoor and outdoor units.
(3) Clean the dust and debris on the indoor and outdoor units.
(4) In the event of rusting, use the anti-rust paint to keep it from spreading.
8.5 Parts Replacement
Purchase parts from an authorized dealer if necessary.
Note:
During airtight and leakage test, never mix oxygen, ethylene or other dangerous gas into
refrigeration circuit. In case of hazard, it's better to use nitrogen or refrigerant for testing.
65
Heat Recovery DC Inverter VRF Multi Units
9 After-sales Service
In case the air-conditioning unit you bought has any quality problem or you have any inquiry,
please contact the installing technician.
Warranty should meet the following requirements:
(1) Startup of the unit should be performed by a qualified technician.
(2) Only approved accessories can be used on the machine.
(3) All the instructions listed in this manual should be followed.
(4) Warranty will be automatically invalid if these conditions are not met.
66
Specifications & illustrations subject to change without notice
or incurring obligations.
O’Fallon, MO (12/15) © Nortek Global HVAC, LLC 2015
All Rights Reserved. 548E-1215
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