ALPICAIR 224 Commercial Air Conditioners Owner’s Manual

Owner’s Manual
Original Instructions
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models:
model 335 / model 391 / model 446 / model 3571

224 Commercial Air Conditioners

Thank you for choosing commercial air conditioners. Please read this Owner’s Manual carefully before operation and retain it for future reference.
To Users
Thank you for selecting ALPICAIR’s product. Please read this instruction manual carefully before installing and using the product, so as to master and correctly use the product. In order to guide you to correctly install and use our product and achieve expected operating effect, we hereby instruct as below:

1. This appliance can be us ed by children aged from 8 y ears and abo ve and persons with reduced physical, sensory or mental capabilities or lack of experience and knowledge if they have been given supervision or instruction concerning use of the appliance in as afe way and understand the hazards involved. Children shall not play with the appliance. Cleaning and user maintenance shall not be made by children without supervision.

2. In order to ensure reliability of pro duct, the product may consume some poweru nder stand-by status for maintaining normal communication of system and preheating refrigerant and lubricant. If the product is not to be used for long, cut off the power supply; please energize and preheat the unit in advance before reusing it.

3. Please properly select the model according to actual using environment; otherwise it may impact the using convenience.

4. This product has gone through strict inspection and operational test before leaving the factory. in order to avoid damage due to improper disassembly and inspection, which may impact the normal operation of unit, please do not disassemble the unit by yourself. You can contact with the special maintenance center of our company if necessary.

5. When the product is faulted and cannot be operated, please contact with our maintenance center as soon as possible by providing the following information.
   1)Contents of nam eplate of product (model, cooling/heating capacity, product No. , ex-factory date).
   2)Malfunction statuses (specify the situations before and after the error occur).

6. All the illustrations and information in the instruction manual are only for reference. In order to make the product better, we will continuously conduct improvement and innovation. We have the right to make necessary revision to the product from time to time due to the reason of sales or production, and reserve the right to revise the contents without further notice.

7. The final right to interpret for this instruction manual belongs to AlpicAir.

Exception Clauses
Manufacturer will bear no res ponsibilities wnen personal injury or property loss is caused by the following reasons:

1. Damage the product due to improper use or misuse of the product;
2. Alter, change, maintain or use the product with other equipment without abiding by the instruction manual of manufacturer;
3. After verification, the defect of product is directly caused by corrosive gas;
4. After verification, defects are due to improper operation during transportation of product;
5. Operate, re pair, maintaint he uni t without abi ding by i nstructionm anual or rel ated regulations;
6. After v erification, the probl em ordi sputei s caused by the qual ity s pecification or performance of parts and components that produced by other manufacturers;
7. The damage is caused by natural calamities, bad using environment or force majeure.

Safety Notices (Please be sure to abide)

| WARNING: If not abide them strictly, it may cause severe damage to the unit or the people.
---|---
| NOTICE: If not abide them strictly, it may cause slight or medium damage to the unit or the people.
| This sign indicates that the operation must be prohibited. Improper operation may cause severe damage or death to people.
| This sign indicates that the items must be observed. Improper operation may cause damage to people or property.

• This product can’t beinstalled at corrosive, inflammable or ex plosive environment or the place with special requi rements, s uch as_ kitchen. O therwise, it wiIl affect the normal operation or shorten the service life of the unit, or even cause fire hazard or serious injury. As for the above special places, please adopt special air conditioner with anti-corrosive or anti-explosion function.
• Awarning to assure that partial units shall only be connected to an appliance suitable for the same refrigerant
• Follow this instruction to complete the installation work. Please carefully read this manual before unit startup and service.
• This unit is a partial unit air conditioner, complying with partial unit requirements of this Intemational Standard, and must only be connected to other units that have been confirmed as complying to corresponding partial unit requirements of this International Standard.
• Installation should be conducted by dealer or qualified personnel. Please do not attempt to install the unit by yourself. Improper handling may result in water leakage, electric shock or fire disaster etc.
• Before using the unit, please check if the pipe and wiring are correct to avoid water leakage, refrigerant leakage, electric shock, or fire etc.
• Don’t dimb the outdoor unit, and don’t put anything on it. If you fall or turn it over, it will cause damage.
• Before performing related operations (such as maintenance, inspection, etc.) for the equipment, the unit must be tumed off and the power supply must be cut off. Moreover, use the relevant instrument check whether the voltage at the power input terminal is zero. After that, you can perform the operation. Otherwise it will cause electric shock or injury (the unit has low-power standby function. Only the main control board indicator is on under standby status).
• If conducting troubleshooting or maintenance for the modular unit, all outdoor units are required to be de -energized or ener gized at the same time. It’s prohibited to energize or de-energize some outdoor units.
• If anything abnomal happens (such as buming smell), please power off the unit and cut off the main power supply, and then immediately contact AlpicAir appointed service center. If abnormality keeps going, the unit might be damaged and lead to electric shock or fire.
• After connecting the power cord, please fix the electric box cover properly in order to avoid accident.
• Be sure to use the exclusive accessory and part to prevent the water leakage, electric shock and fire accidents.
• Make sure the unit can be earthed properly and soundly after plugging into the socket so as to av oid electric shock. Please do not connect the grou nd wire to gas pipe, water pipe, lightning rod or telephone line.
• The leakage circuit breaker must be installed. If not, it may cause electric shock or Fire.
• If refrigerant leakage happens during installation, please ventilate immediately. Poisonous gas will emerge if the refrigerant gas meets fire.
• Refrigerant gas is heavier than air and oxygen, especially in the basement. A large amount of refrigerant leakage will cause the decrease in oxygen and then cause suffocation, which will affect the health of people.
• After all instaliations are completed, check whether there’s refrigerant leakage.
• Do not install the unit in a flammable place. Otherwise, it will cause an explosion and affect the health of people.
• Disposal of packaging, transportation materials and other parts must comply with the relevant regulations of the local country.

NOTES!

• Before installation, please check if the power supply is in accordance with the requirements specified on the nameplate. And also take care of the power safety.
• Turn off the unit after it runs at least five minutes; otherwise it will influence oil return of the compressor.
• Electrify the unit 2 hours before operation. Please switch on for 2 hours before operation. Do not cut off the power when 24 hours short-time halting (to protect the compressor).
• The air conditioner should be grounded, and the power outlet must be equipped with a ground wire to ens ure that the air conditioner is effectively ground ed through the po wer socket to avoid the risk of electric shock.
• Under cooling mode, please don’t set the room temperature too low.
• When the air conditioner is installed in a small room, take the necessary measures to avoid the concentration of the refrigerant exceeding the limit value for safety.
• When the external temperature is decreased, the heating performance of the unit will be decreased. If so, please use another heating device for heating at the same time. (When you use a he ating de vice with open fire inthe same room, please always open the door or window to keep the air circulation and avoid the lack of oxygen in the room.) Please do not put the heating device with open fire at the air outlet, or put it under the air conditioner.
• When the unit is turned on for heating, it takes time for the room temperature to rise because the unit uses hot air circulation to heat the entire room.
• Openthe door and window and keep good ventilation in the room to avoid oxygen deficit when the gas/oil supplied heating equipment is used.
• Volatile liquid, such as diluent or gas will damage the unit appearance. Only use soft cloth with a little neutral detergent to clean the outer casing of unit.
• Install the air conditioner in a solid place that can withstand its weight. Fully consider the influence of strong winds, typhoons and earthquakes and rei nforced installation. Improper installation will cause the air conditioning unit to fall and then cause injury.
• Please use the electric wire with specified specifications. Electrical installation work must comply with local laws and regulations. Insufficient capacity or improper electrical operation can cause electric shock or fire.
• All electric wires must be confirmed to be connected well so that the wiring terminals and electrical wires are not pulled by external force. Improper installation may cause fire.
• After connecting the power cord, please fix the electric box cover properly in order to avoid accident.
• After confirming that the unit’s power is off, you can touch the electrical components of the unit, otherwise it will cause electric shock.
• Donot modify the unit protection settings. If a pressure switch, end switch or other protective device is short-circuited and forced to operate, it may cause a fire or explosion.
• When installing the unit, make sure that the connection pipe is securely connected before starting up the compressor. If the compressor is started up before the connection of the connecting pipe is completed and the shut-offv alve is opened, mixed air willc ause the system pressure to rise, which may cause compressor bursting accident and injury.
• Heat exchanger fins are sharp. You may be injured if used it incorrectly. Please wear the gloves to avoid injury.
• Donot directly touch the refngerant pipes during the operation and wh en the operation is finished just now, including refrigerant pipes, compressors, and other refrigerant circulation pipes. These pipes are hot and cold. It will scald and frostbite if directly contacts them. To avoid injury, please wait until the pipes reach to normal temperature. Please wear gloves when you must touch it.
• Improper installation of drain pipes can result in water leakage and poor function.
• R410Ais a mixture. The refrigerant must be filled from the liquid pipe. If the refrigerant is filled from the gas pipe, the composition of the refrigerant will change and the system can’t operate normally.
• Take adequate measures to prevent small animals from making nests in the unit. Once small animals touch el ectricalc omponents, it mayc ausem alfunction or firehaz ard. Remind customers to clean around the unit.
• The installed indoor unit, outdoor unit, power cord and connection wire must be at least 1m away from the TV or radio to avoid image interference or noise. If the radio wave is strong, sometimes even if the distance is more than 1 m, it is not enough to avoid interference.
• When disassembling the unit, handling refrigerants, oil and other components of the unit, it must be in accordance with the relevant national/continental regulations.
• Ajr conditioning units or heat pump units are appliances which are not easily accessible to the public.
• The design pressure is 4.3 MPa. The thickness of pipe for installation should comply with the relevant national/continental regulations.
• After the power cord is installed, please note to ensure that the power cord should not direct touch the sheet metal of electric box.

NEVER TO DO

• Never start up or shut off the air conditioner by means of directly plug or unplug the power cord.
• Donot insert fingers or objects into air outlet/inlet grille.
• Donot operate this unit with wet hands.
• Never short-circuit or cancel the pressure switch to prevent unit damage.
• Never fail to comply with the nitrogen charge requirements. Charge nitrogen when welding pipes.
• Never spray or flush water towards unit, otherwise malfunction or electric shock may happen.
• Never allow children to play around or on the top of the unit, otherwise injury may happen.

MUST TO DO

• User is not allowed to repair the unit. Fault service may cause electric shock or fire accidents. Please contact AlpicAir appointed service center for help.
• Donot expose the unit to the moist or corrosive circumstances.
• Do not directly touch the refrigerant leaking from the refrigerant pipe connection place, as it may cause frostbite.
• Please firstly connect the wired controller before energizing, otherwise wired controller can’t be used.
• The power cable diameter should be big enough. If the power cord and connection wire are damaged, they must be replaced with the special cables.
• Once all installations are completed, check whether there is refrigerant leakage.

Product Introduction

2.1 Product Features
AlpicAir Multi VRF Modular System adopts inverter compressor technology. According to change the displacement of compressor, s tepless c apacity regul ation wi thin range of 10% -100% can be realized. Various product lineup is provided with capacity range from 22.4kW to 246kW, which can be widely used in working area and especially applicable to the place with variable load change.
2.2 Product List
2.2.1 Combinations of Outdoor Units

Model| model 224| model 280| model 335| model 400| model 450| model 504| model 560| model 615
---|---|---|---|---|---|---|---|---
model 224| | | | | | | |
model 280| | | | | | | |
model 335| | | | | | | |
model 400| | | | | | | |
model 450| | | | | | | |
model 504| | | | | | | |
model 560| | | | | | | |
model 615| | | | | | | |
model 680| | | | | | | |
model 730| | | | | | | |
model 784| | | | | | | |
model 840| | | | | | | |
model 895| | | | | | | |
model 950| | | | | | | |
model 1015| | | | | | | |
model 1065| | | | | | | |
model 1119| | | | | | | |
model 1175| | | | | | | |
model 1230| | | | | | | |
model 1290| | | | | | | |
Model| model 224| model 280| model 335| model 400| model 450| model 504| model 560| model 615
---|---|---|---|---|---|---|---|---
model 1345| | | | | | | |
model 1400| | | | | | | |
model 1455| | | | | | | |
model 1510| | | | | | | |
model 1565| | | | | | | |
model 1630| | | | | | | |
model 1680| | | | | | | |
model 1734| | | | | | | |
model 1790| | | | | | | |
model 1845| | | | | | | |
model 1905| | | | | | | |
model 1959| | | | | | | |
model 2015| | | | | | | |
model 2070| | | | | | | |
model 2125| | | | | | | |
model 2180| | | | | | | |
model 2245| | | | | | | |
model 2295| | | | | | | |
model 2349| | | | | | | |
model 2405| | | | | | | |
model 2460| | | | | | | |

NOTE!
means a basic module
2.2.2 Combinations of Indoor and Outdoor Units
(1) The following table indicates the number of IDU for ODU:

ODU model| Max number of connectable IDU (unit)| ODU model| Max number of connectable IDU (unit)
---|---|---|---
model 224| 13| model 1400| 66
model 280| 16| model 1455| 69
model 335| 19| model 1510| 71
model 400| 23| model 1565| 74
model 450| 26| model 1630| 77
model 504| 29| model 1680| 80
model 560| 33| model 1734| 80
model 615| 36| model 1790| 80
model 680| 39| model 1845| 80
model 730| 43| model 1905| 80
model 784| 46| model 1959| 80
model 840| 50| model 2015| 80
model 895| 53| model 2070| 80
model 950| 56| model 2125| 80
model 1015| 59| model 2180| 80
model 1065| 63| model 2245| 80
model 1119| 64| model 2295| 80
model 1175| 64| model 2349| 80
model 1230| 64| model 2405| 80
model 1290| 64| model 2460| 80
model 1345| 64| ——| ——

(2) The total capacity of indoor units should be within 50%~135% of that of outdoor units.
(3) When any one of the indoor units receives the operation command, the outdoor unit starts running according to the required capability; wnen all indoor unit stops running, the outdoor unit stops operation.
2.3 Names of Main Parts

2.4 Product Working Principle
2.4.1 Working Principle Introduction
The outdoor unit of GMV6 multi VRF unit can be realized by parallel combination of modules, and the indoor unit can also be composed of multiple units in parallel. The working principle is as follows: when the indoor unit is running in the cooling mode, the outdoor units tarts the out door module according to the running load demand of the indoor unit. The outdoor heat exchanger is used as the condenser of the system, and the heat exchangers of indoor units are connected in parallel as the evaporator of system. It realizes the adjustment of the air temperature and humidity for indoor space through the return air circulation of the indoor unit; when the indoor unit is in the heating mode, all the four-way valves of the outdoor unit module are switched to the energizing state, the outdoor heat exchanger is used as the evaporator of the system and the heat exchanger of indoor unit is used as the condenser of the system. The air temperature and humidity in the indoor space is realized by the return air circulation of the indoor unit.
2.4.2 Working principle Diagram
System principle diagram of model 224 , model 280 , model 335System principle diagram of model 400 , model 450System principle diagram of model 504 , model 560 , model 615 2.5 The Range of Production Working Temperature

When the indoor units are all VRF fresh air processor, the unit operating range is as follows:

NOTE!
if exceeding the temperature range for working, the product may be damaged, which is not within the warranty range.
2.6 Standard Parts
Please use the following standard parts supplied by AlpicAir.

Parts for Outdoor Unit

Number| Name| Picture| Quantity| Remarks
1| Owner’s Manual| | 1| ——

2

| Wiring (match with resistance)| |

1

| Must be connected to the last IDU of communication connection
---|---|---|---|---
3| L-shape pipe| | 1| Used for connecting pipes

Product Installation

3.1 Safety Precautions for Installing, Repairing and Moving Units

1. The uni ts hould not be installedin pl aces wi th hi gh en vironmental pH, hi gh v oltage fluctuations, vehicles and ships.

2. Do not touch the fins of the heat exchanger. Improper touch can cause damage or injury.

3. Do not mix any substances except the refrigerant when installing or moving the refrigerant circuit, and donot leave any airin the pipe. If air or ot her substances are mixed in the refrigerant circuit, the system pressure will rise and it will cause compressor explosion.

4. Do not charge the refrigerant other than the specified one when installing or moving the unit. Otherwise, it may cause problems such as poor operation, malfunction, mechanical fault, etc., and even cause major safety accident.

5. When moving or rep airing the unit, be sure to use the pressure gauge. First, perform the cooling oper ation, and then completely close the high pres sure side valve (liquid valve).
   When the pressure gauge reads 0~0.05MPa, completely close the low pressure side valve (air valve), and then immediately stop operation and cut off the power.

6. When recovering the refrigerant, it is necessary to ensure that the connection pipe can be disassembled only after the liquid valve and the air valve are completely closed and the power is tumed off. If disassembling the connection pipe when the power hasn’t been cut off and the compressor still running, the air will be mixed into the system and then the pressure will rise, which will cause compressor explosion.

7. When installing the unit, make sure that the connection pipe is securely connected before tuming on the compressor. If the compressor is turned on bef ore the connection of the connection pipe is completed and the shut-off valve is opened, the air will be mixed into the system and then the pressure will rise, which will cause compressor explosion.

8. Wiring between indoor unit and outdoor unit must be properly connected by adopting the specified electric wires and the terminals should be fixed well and not affected by external forces. Poor connection or fixing may cause a fire accident.

9. No connection is allowed in the middle of the wire. When the length of the connection wire is not enough, please contact the designated service store to re-equip a dedicated electric wire with sufficient length.

Outline and Physical Dimension of model 400,model 450,model 504,model 560,model 615, unit.

3.2.2 Select Installation Position
Conditions for selecting the installation position:

1. Install the unit at a place where is adequate to withstand the weight of the unit and make sure the unit would not shake or fall off.
2. Fully consider the influence of strong winds, typhoons and earthquakes when selecting the installation site, and strengthen the installation.
3. The influence of flammable, explosive, corrosive gases or exhaust gases should be avoided.
4. Ensure that there is acertain space for heat ex changing and maintenance, so that the ventilation is smooth and the running is reliable.
5. Outdoor units and indoor units should be as close as possible to minimize the length and angle of the cooling pipes.
6. Do not allow children to approach the unit. Preventive measures should be taken to prevent children from contacting the unit.
7. The units hould not be installed in pl aces with highenv ironmental pH or high voltage fluctuations, and places such as vehicles and ships.
8. Donot install the unit att he pl ace where is closet othe equipment that generat es electromagnetic waves. Electromagnetic waves can affect the controls ystem and cause fault.

3.2.2.1 Take Seasonal Wind into Consideration When Installing the Outdoor Unit
(1) Anti-monsoon installation requirements for unit not connecting exhaust duct.
When the exhaust duct is not connected, a protective cover should be installed according to the seasonal wind circumstances.
NOTE!
The photo is only for reference. Please refer to the installation locale.(2) Anti-monsoon installation requirements for unit connecting exhaust duct: 3.2.2.2 Take Snow into Consideration When Installing the Outdoor Unit
When the unit is installed, the snow should be taken into consideration for the height of the base.
NOTE!
The photo is only for reference. Please refer to the installation locale. 3.2.3 Installation Space Requirements
The installation space of the unit should consider the maintenance space of the unit and the ventilation of the unit. Select an installation method according to the actual situation.

b≥100
c≥100
d≥500| a≥300
b≥300
Status 2| a≥300
b≥100
c≥100
d≥500
e≥100| a≥300
b≥300
e≥400
Status 3| a≥300
b≥100
c≥100
d≥500
e≥200
f≥600| ——
Status 4| a≥300
b≥100
c≥100
d≥100
e≥200
f≥500| ——
---|---|---
Status 5| a≥300
b≥500
c≥100
d≥500
e≥200
f≥900| ——

NOTE!

1. The installation space shown above is based on the cooling operation when the outdoor temperature is 35°C. If the outdoor temperature exceeds 35°C or the heat load is large, and all outdoor units are operating at an excess capacity, the space at the suction side should be increased.
2. When disassembling or installing the unit, the operation may be affected by obstacles, and the distance from the unit to the wall surface may be appropriately increased.
3. When two or more units are installed and pl aced, the operation may be affected by the adjacent units. The distance between the two adjacent units is “e” 2 100mm.
4. When the unit is installed in place around by walls, the height of left and right side walls is not limited; the height of air inlet side wall is below 500mm, and the height of front side wall is below 1500mm.
5. If the wall exceeds the above value, increase the space as follows.
6. If there is an obstacle above the unit, install the unit as follows.
   In principle, the top of the unit is required to be more than 3000 mm from the top wall. if the space around the front, back, left and right sides of the unit is open space, the top of the unit is required to be 1500mm or more from the top wall, as shown in the fig. as below. If the size is less than 1500mm, or if the space around the unit is not open, you need to connect an exhaust duct for smooth ventilation, as shown below.

3.2.4 Installation Space Requirements for Equipment Floor
When the outdoor unit is installed in the equipment floor, it needs to connect an air exhaust duct. The opening ratio of the shutters in the equipment floor is not less than 60%, and the horizontal angle of louvers is less than 20°.
3.2.5 Diagram of installation foundation
The concrete foundation of the ODU must be strong enough. Ensure that the drainage is smooth and that the ground drainage or floor drainage is not affected.
Requirements on the concrete foundation are as follows:

1. The concrete foundation must be flat and have enough rigidity and strength to undertake the unit’s weight during running. The height of the foundation is 200 mm to 300 mm, which is determined based ont he size of the unit. If itis installed in pl ace with I arge s nowfall, increase the height of the foundation so that the air inlet side is not buried by snow.
2. Build a drainage ditch around the foundation to discharge the condensate water.
3. Ifthe air conditioner is installed on the roof, check the intensity of the building and take waterproof measures.
4. If au-steel foundation is adopted, the structure must be designed with sufficient rigidity and strength.
5. Cement foundation diagram is shown as follows:

3.2.6 Shock absorption requirements
The outdoor unit should be firmly fixed. Thick rubber sheets or corrugated rubber damping rubber mats with a thickness of 20mm at least and a width of 100mm at least should be placed between the unit and the foundation. The installation requirements are shown as follows. 3.3 Pipeline Design
3.3.1 Notices for Pipeline Design

1. Air-conditioning installation should not damage the load-bearing structure and decorative style of the building.
2. Air-conditioning pipes should be laid along the bottom of the beam. If the pipes meet at the same elevation, they should be treated as follows:

1. Drain pipes, ducts and pressure pipes avoid gravity pipes.
2. Ducts and small tubes give priority to big tubes.

3. It should be ensured that the direction is correct, the branch is reasonable, the length is the 0shortest, and the brazed joint and bend are minimized.
4. The ref rigerantpi pe m ust by pass thei nspection port of the unit, leaving sufficient maintenance space.
5. The vertical pipe should be laid in the air conditioning pipe well. The horizontal pipe should be laid in the ceiling.

3.3.2 Pipeline Requirement
Pipe specification is shown as follows:

R410A Refrigerant System

External diameter(mm)| Thickness(mm)| Type
Ф6.35| ≥0.8| O
Ф9.52| ≥0.8| O
Ф12.70| ≥0.8| O
Ф15.9| ≥1.0| O
Ф19.05| ≥1.0| 1/2H
Ф22.2| ≥1.2| 1/2H
Ф25.40| ≥1.2| 1/2H
Ф28.60| ≥1.2| 1/2H
Ф31.80| ≥1.3| 1/2H
Ф34.90| ≥1.3| 1/2H
Ф38.10| ≥1.5| 1/2H
Ф41.30| ≥1.5| 1/2H
Ф44.5| ≥1.5| 1/2H
Ф51.4| ≥1.5| 1/2H
Ф54.1| ≥1.5| 1/2H

Remarks:

1. The inner and outer surfaces of the pipeline shall befree of pinholes, cracks, skinning, foaming, inclusions, copper powder, carbon deposits, green rust, dirt and severe oxide film, and shall not allow obvious scratches, pits and spots. defect.
2. Once the inside of the copper tube is cleaned and dried, the nozzle must be tightly sealed with a cap, plug or tape.

3.3.3 Allowable pipe length and height difference among indoor and outdoor units
Y type branch joint is adopted to connect indoor and outdoor units. Connecting method is shown in the figure below.![ALPICAIR 224 Commercial Air Conditioners

• parts16](https://manuals.plus/wp-content/uploads/2024/02/ALPICAIR-224 -Commercial-Air-Conditioners-parts16.jpg)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.

L1+L2+L3+L4+….+L9+a+b+….+i+j
Length of farthest fitting pipe(m)| Actual length| ≤200| L1+L6+L7+L8+L9+j
Equivalent length| ≤240
Equivalent length from the first branch to the furthest indoor unit1| ≤120| L6+L7+L8+L9+j
Height difference between outdoor unit and indoor unit H2| Outdoor unit at upper| ≤100| ——
Outdoor unit at lower| ≤110| ——
Height difference between indoor units| ≤40| ——

NOTES!

1. Note 1: Normally, the pipe length from the first branch of IDU to the farthest IDU is 40m.
   When those three conditions as below are satisfied, the length can reached 120m.

1. Actual length of pipe in total: L1+L2x2+L3x2+L4x2+…+L9x2+a+b+…+i+js1000m:;
2. Length between each IDU and its nearest branch a, b, c, d, e, f, g, h, i, js40m:;
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.

2. Note 2: When the ODU is at the up side and the height drop exceeds 50m, please contact the engineer; when the ODU is at the lower side and the height drop exceeds 90m, please contact the engineer.
   When the ODU is at the up side and the height drop between the IDU and ODU is more than 50m, the liquid pipe size from the ODU to the first manifold of IDU must be enlarged.
   When the ODU is at the lower side and the height drop between the IDU and ODU is more than 40m, the liquid pipe size from the ODU to the first manifold of IDU must be enlarged.

3. When the height drop among IDUs is more than 15m, the liquid pipe size from the ODU to the first manifold of IDU must be increased.

4. When the maximum length of the main pipe from ODU to the first branch of IDU is290m, then adj ust the pipe size of the gas pipe and I iquid pipe of main pipe according to the following table.
   Outdoor Model| Gas pipe size(mm)| Liquid pipe size(mm)
   ---|---|---
   model 224| No need to enlarge pipe size| No need to enlarge pipe size
   model 280| No need to enlarge pipe size| Ф12.7
   model 335| Ф28.6| Ф15.9
   model 400| Ф28.6| Ф15.9
   model 450| Ф31.8| Ф15.9
   model 504| Ф31.8| Ф19.05
   model 560| Ф31.8| Ф19.05
   model 615| Ф31.8| Ф19.05
   model 680| Ф31.8| Ф19.05
   model 730| Ф38.1| Ф22.2
   model 784| Ф38.1| Ф22.2
   model 840| Ф38.1| Ф22.2
   model 895| Ф38.1| Ф22.2
   model 950| Ф38.1| Ф22.2
   model 1015| Ф41.3| Ф22.2
   model 1065| Ф41.3| Ф22.2
   model 1119| Ф41.3| Ф22.2
   model 1175| Ф41.3| Ф22.2
   model 1230| Ф41.3| Ф22.2
   model 1290| Ф41.3| Ф22.2
   model 1345| Ф41.3| Ф22.2
   model 1400| Ф41.3| Ф22.2
   model 1455| Ф44.5| Ф22.2
   model 1510| Ф44.5| Ф22.2
   model 1565| Ф44.5| Ф22.2
   ---|---|---
   model 1630| Ф44.5| Ф22.2
   model 1680| Ф44.5| Ф22.2
   model 1734| Ф44.5| Ф22.2
   model 1790| Ф44.5| Ф22.2
   model 1845| Ф44.5| Ф22.2
   model 1905| Ф44.5| Ф22.2
   model 1959| Ф44.5| Ф22.2
   model 2015| Ф51.4| Ф25.4
   model 2070| Ф51.4| Ф25.4
   model 2125| Ф51.4| Ф25.4
   model 2180| Ф51.4| Ф25.4
   model 2245| Ф51.4| Ф25.4
   model 2295| Ф51.4| Ф25.4
   model 2349| Ф51.4| Ф25.4
   model 2405| Ф51.4| Ф25.4
   model 2460| Ф51.4| Ф25.4

5. If the liquid pipe is enlarged for a situation from (2) ~ (4), please do not enlarged any more.

6. If the length between an IDU and its nearest branch is above 15m, then increase the size of the liquid pipe (only for the pipe size that iss6.35mm) and gas pipe (only for the pipe size that iss9.52mm) of IDU.

3.3.4 Connection Pipe among Outdoor Modules
(1) The pipe among the outdoor modules must be at the same level or tilted upwards. Otherwise, the refrigeration oil will remain in the pipe.(2) The drop and the length of the pipe between the outdoor units are as follows. NOTE!
When the distance A+B between the outdoor modules exceeds 2m, U-type oil trap should be added at low-pressure gas pipe and isnom orethan2m away fromthe outdoor manifold, and A+Bs10m. The height drop among the outdoor units is Om.
3.3.5 Pipe Selection (1) When it’s modular units connection, the ODU must be installed in capacity order: ODU 4 ≥ ODU 3 ≥ ODU 2 ≥ ODU 1.
(2) Pipe “A” between the outdoor unit and the manifold of outdoor unit.
The pipe size is based on the capacity of upstream module.

(3) Fitting pipe “B” between outdoor unit manifold; fitting pipe “C” from outdoor unit to indoor manifold.
Pipe size (between two manifolds from basic modules) is based on the total capacity of upstream modules.

(4) Fitting pipe “D” between indoor side manifolds.
Pipe size (between two manifolds at indoor unit side) is based on the total capacity of downstream indoor unit(s).

Total capacity of downstream indoor unit(s) C(kW)| Dimension of the pipe of indoor branch
---|---
Gas pipe(mm)| Liquid pipe(mm)
C≤5.0| Ф12.7| Ф6.35
5.0<C≤14.2| Ф15.9| Ф9.52
14.2<C≤25.2| Ф19.05| Ф9.52
25.2<C≤30.0| Ф22.2| Ф9.52
30.0<C≤40.0| Ф25.4| Ф12.7
40.0<C≤45.0| Ф28.6| Ф12.7
45.0<C≤68.0| Ф28.6| Ф15.9
68.0<C≤96.0| Ф31.8| Ф19.05
96.0<C≤135.0| Ф38.1| Ф19.05
135.0<C≤186.0| Ф41.3| Ф19.05
186.0<C| Ф44.5| Ф22.2

(5) Fitting pipe “E” between indoor unit and manifold.
Manifold should be matched with fitting pipe of indoor unit.

Rated capacity of indoor unit C(kW)| Pipe between indoor branch and IDU
---|---
Gas pipe(mm)| Liquid pipe(mm)
C≤2.8| Ф9.52| Ф6.35
2.8<C≤5.0| Ф12.7| Ф6.35
5.0<C≤14.2| Ф15.9| Ф9.52
14.2<C≤25.2| Ф19.05| Ф9.52
25.2<C≤30.0| Ф22.2| Ф9.52
30.0<C≤40.0| Ф25.4| Ф12.7
40.0<C≤45.0| Ф28.6| Ф12.7

(6) Select the branch “1” of outdoor module.

(7) Select the manifold “2” at indoor side.
Manifold at indoor unit side can be selected as per total capacity of downstream indoor unit(s).
Refer to the following table.

R410A Refrigerant System| Total capacity of downstream indoor unit(s) C(kW)| Model
---|---|---
Y-type Manifold| C<20.0| FQ01A/A
20.0≤C≤30.0| FQ01B/A
30.0<C≤70.0| FQ02/A
70.0<C≤135.0| FQ03/A
135.0<C| FQ04/A
T-type Manifold| C≤40.0| FQ14/H1
C≤68.0| FQ18/H1
68.0<C| FQ18/H2

3.4 Pipeline Installation and Insulation
3.4.1 Pipeline Installation of Refrigeration System

1. Before welding the pipeline sealing cap, please make sure there’s no refrigerant in pipeline.
   If welding it directly, it may cause unnecessary property damage or personal injury.

2. Conform to the following principles during pipe 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 little as possible. The radius of curvature should be as large as possible.

3. Weld the connection pipes between indoor and outdoor unit. Please strictly conform to the requirements for welding process. Rosin joints and pin holes are not allowable.

4. When laying the pipes, be careful not to deform them. The radius of bending parts should be more than 200mm. The pipes can’t be repeatedly bent or stretched, otherwise the material will get harden. Do not bend or stretch the pipe over three times at the same position.

5. Please use a torque wrench to connect union nut on the indoor unit. See the Fig. 3.4.1 as below.

1. Align the expansion end of copper pipe with the center of threaded joint. Tighten the flare nuts with your hands.
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 tie it up with plastic tape.
4. A mounting support for the connection pipe is required.
5. The curvature degree of connection pipe should not be small, otherwise the pipe might crack. Installation personnel should use tube bender when bending the pipe.
6. Don’t forcibly stretch the pi pe j oint, ot herwise indoor c apillary or ot her pipes might be damaged and lead to refrigerant leakage.

3.4.2 Installation of the manifold
The main function of manifold is used to shunt the refrigerant. Pay attention to the following points when installing it:

1. When installing the manifold, it should be as close as possible to the indoor unit to reduce the influence of the indoor unit manifold on the refrigerant distribution.
2. The manifold m ust be m atched wi th t he equi pment. The ot her pro ducts which are not specified by the manufacturer shall not be used.
3. Check the model before installing the manifold. Do not use it incorrectly.

1. Y-type manifold, see in Fig. 3.4.2(a). T- type manifold, See the Fig. 3.4.2(b)

2. Manifold has several pipe sections with different pipe size, which facilitates to match with various copper pipe. Use pipe cutter to cut in the middle of the pipe section with different pipe size. See the Fig. as below.3) Y-type manifold can be installed vertically or horizontally. Confirm the position and then weld the manifold pipe. See Fig. 3.4.4(a). T-type manifold must be installed horizontally with inclination, see the Fig. 3.4.4(b).![ALPICAIR 224 Commercial Air Conditioners

• parts24](https://manuals.plus/wp-content/uploads/2024/02/ALPICAIR-224 -Commercial-Air-Conditioners-parts24.jpg)4) The length of a straight pipe between two manifolds cannot be less than 500 mm.

5. The length of a straight pipe before the main pipe port of the manifold cannot be less than 500 mm.
6. The length of a straight pipe between the branch of the manifold and the IDU cannot be less than 500 mm. 3.4.3 Fixation of Manifold
   (1) There must be three fixing point for both horizontal and v ertical installation of the Y-type manifold.
   Fixing point 1: 100 mm on the main inlet manifold from the welding point.
   Fixing point 2: 200 mm on the main branched pipe from the welding point.
   Fixing point 3: 250 mm on the branched pipe from the welding point.

1. Fixing point 3 hanger rod
2. Fixing point 2 hanger rod
3. Fixing point 1 hanger rod
4. Welding point 3
5. Welding point 2
6. Welding point 1

(2) Suspend the header t o the ceiling, and be s ure to install the T-type manifold so that the outlet pipes are horizontal at the lower side.(3) The branches of the manifold should be parallel and should not be overlapped.
(4) The liquid pipe and t he gas pipe should have the same pipe length and t he same laying circuit.
Since the structure of the manifold is relatively complicated, it must be rigorous and careful for heat preservation to ensure the tight insulation.
3.4.4 Refrigerant Pipe Insulation
(1) Insulation Material Selection

1. Insulation materials should be made of materials that can withstand pipeline temperature:
   For heat pump unit, liquid pipe should bear 70°C or above, and gas pipe should bear 120°C or above. For cooling only unit, both liquid pipe and gas pipe should bear 70°C or above.
   Example: heat -resistant pol yethylene f oam (re sistantt o1 20°C orm ore); f oamed polyethylene (resistant to 100 ‘C or more).
2. When the diameter of the copper pipe is more than or equal to ©15.9mm, the wall thickness of the insulation material is no less than 20mm; when the diameter of the copper pipe is less than 15.9mm, the wall thickness of the insulation material is no less than 15mm.
   (2) Pipeline Wrapping

1. To avoid condensate or water leakage on connecting pipe, the gas pipe and liquid pipe must be wrapped wi th thermal insulating material and adh esive pipe for insulation from the air.
2. Joints at indoor and outdoor units should be wrapped with insulating material and leave no clearance between pipe and wall. See Fig. 3.4.8.
3. When wrapping the tape, the later circle should cover half of the former one. Don’t wrap the tape so tightly, otherwise the insulation effect will be weakened.
4. After wrapping the pipe, adopt sealing material to completely fill the hole.

3.4.5 Support and Protection of Pipelines

1. The s uspended c onnection pi pes s hould be s upported, andt he distance bet ween the supports should not exceed 1m.
2. The outdoor pipeline should be protected against accidental damage. If the pipeline exceeds 1m, a gusset plate must be added to the pipeline.

3.5 Static Pressure Ventilation Pipe Installation
Refer to this section when a static pressure ventilation duct should be installed for the unit.
3.5.1 Preparation of Static Pressure Ventilation Pipe Installation

1. Install the outdoor unit well.
2. Thes teel pl ate v entilation pi pei s designed ac cording t ot he uni t and engi neering requirements, and is installed well in accordance with the engineering regulations.
3. According to the size of the unit and s teel plate ventilation pipe, prepare suitable canvas casing, tin foil paper, steel strip and self-tapping screws, and prepare tools such as electric drill, screwdriver, etc.

3.5.2 Ventilation Pipe Installation
When the effective area of the air inlet is less than 70% of the total inlet area of all outdoor unit, it needs to add an induced draft fan. The total air volume of the induced draft fan is not less than 80% of the total intake air volume.
NOTE!
Inthe following table, “1” indicates the steel plate ventilation pipe, “2” indicates the outdoor unit, “3”indicates the top cover assembly, “4” indicates the canvas casing and “5” indicates the steel bar. The specific operations are as below:

it well;
2. Determine the installation position of the ventilation pipe according to the position of the outdoor unit;
3. Refer to the left figure to complete the fabrication and installation of the ventilation pipe.| 1. Ventilation pipe material: steel plate or iron sheet;
2. Ventilation pipe should be purchased by the user.
Step 2| | 1. Remove the self-tapping screws around the top cover assembly with screwdriver and t hen remove the top cover assembly.
2. Remove the grille on the top of the top cover assembly.| The top cover grille must be removed; otherwise it will affect the air volume and the operation effect.
Step 3| | Face the inside of the prepared canvas casing outwards, cover it from the top of the unit until the end of the canvas is flush with the unit or slightly higher than the unit.| ——
---|---|---|---
Step 4| | 1. Reinstall the top cover and press the canvas sleeve tightly;
2. Fasten the top cover to the unit with  self-tapping screws.| ——
Step 5| | 1. Pull the canvas casing upside down and press it on the butt flange of the steel pipe ventilation pipe with steel bars;
2. Drill holes with the manual drill and fix them with self-tapping screws;
3. Seal the two butt joints with tinfoil panel and check the reliability of the connection.| ——
---|---|---|---

3.6 Vacuum and Drying of Refrigeration System
3.6.1 Air Tightness Test
(1) Notices

1. The range of test pressure gauge for R410A system should be above 4.5MPa.
2. Record the pressure gauge readings, ambient temperature and test time.
3. Pressure correction: The temperature changes by 1 °C, and the pressure changes by 0.01MPa.
4. The pressure should remain unchanged to be qualified.
5. If it is necessary to maintain pressure for a long time, the pressure should be reduced to 0.5MPa or less. Long periods of high pressure can cause leakage at the weld site and there is safety hazard.
6. Before the air tightness test for the refrigerant pipe is completed, itis not allowed to conduct the insulation and wrapping work for any joints between the welding point and the bell mouth of indoor unit. Please increase pressure from the outdoor side pipes at the same time. It is forbidden to increase pressure from one side pipe:

NOTE!
All welding points can’t be heat-insulated and wrapped until the air tightness test is completed.
(2) Operation procedures for the air tightness test
When leaving the factory, gas pipe, liquid pipe and cut-off valve of outdoor unit have been closed. Please confirm it during installation.
Before the test, a small amount of lubricant oil required by the corresponding system should be smeared at the nut and the end of the pipe. Two wrenches should be used when fixing the nut.
It is not allowed to connect the pipeline of outdoor unit for test during the air tightness test.
The test pressure for R410A system is 4.15MPa. The air tightness test must use nitrogen as the medium and the nitrogen should be dried. Slowly increase the pressure in three steps:
Step 1: slowly increase the pressure to 0.5MPa, stay for 5 m inutes and c onduct the leakage inspection. You may find big leakage;
Step 2: slowly increase the pressure to 1.5MPa, stay for 5 minutes, conduct the air tightness inspection, and you may find small leakage;
Step 3: Slowly increase the pres sure for R410A system to 4.15MPa, stay for 5 m inutes and conduct the strength test. You may find small penetration or blisters. After increasing the pressure to the test pressure, hold the pressure for 24 ho urs, and obs erve whether the pressure drops. If the pressure does not drop, it is qualified.
3.6.2 Vacuum Drying

1. Selection requirements for vacuum pumps.

1. Can’t vacuumize different refrigerant systems with the same vacuum pump.
2. The ultimate vacuum of the vacuum pump should be -0.1Mpa.
3. The air displacement of the vacuum pump should be above 4L/s.
4. The accuracy of the vacuum pump should be above 0.02mmHg.
5. The system vacuum pump must have a check valve.

2. Operation procedures of vacuum drying.

1. Before vacuuming, confirm that the stop valves of gas pipe and liquid pipe are at closed status.
2. Connect the regulating valve and vacuum pump to the inspection joint of the gas pipe valve and liquid pipe valve valves with a filling tube.
3. Vacuumize it for 4 hours, and check if the vacuum degree reaches -0.1MPa or above. If not, there may be a leak. It needs to conduct the leakage test once again. If there is no leak, vacuumize it for another 2 hours.
4. If the vacuum degree cannot be maintained by two times of vacuums, you can confirm that there is water inside the pipeline under the condition that there is no leakage. At this time, the water should be removed by vacuum destruction. The specific method is: fill the pipeline with 0.0SMPa nitrogen gas, vacuumize it for 2 hours, and keep vacuum for 1 hour. If it still can’t reach the vacuum degree of -0.1MPa, repeat this operation until the water is drained.
5. After vacuuming, close the valve of the regulating valve and stop vacuuming for 1 hour. Confirm that the pressure of the regulating valve has not risen.

3. Notices for vacuum drying

1. Vacuumize it from both the gas pipe and liquid at the same time.2) When the vacuum pump is turned off to stop vacuuming, the valve should be closed at first and then cut off the power for the vacuum pump.
2. Keep the vacuum for 2 hours and confirm that the pressure of the vacuum gauge has not risen.

3.7 Additional refrigerant charging
3.7.1 Calculation Method of Adding Refrigerant
Total refrigerant charging amount R= Pipeline charging amount charging amount B of every module.
(1) Pipeline charging amount:
Pipeline charging amount Liquid pipe length x refrigerant charging amount of every 1m liquid pipe

Diameter of liquid pipe (mm)| Ф28.6| Ф25.4| Ф22.2| Ф19.05| Ф15.9| Ф12.7| Ф9.52| Ф6.35
---|---|---|---|---|---|---|---|---
kg/m| 0.680| 0.520| 0.350| 0.250| 0.170| 0.110| 0.054| 0.022

(2) ∑ Refrigerant charging amount B of every module

NOTES!

1. Rated capacity configuration rate of indoor unit and outdoor unit C = sum of indoor unit rated cooling capacity / sum of outdoor unit rated cooling capacity.
2. If all indoor units are all fresh air indoor units, the added refrigerant amount for each module B is Okg.
3. If all fresh air indoor units are mixed with the general VRF indoor units, charge the refrigerant according to the refrigerant-charging method of the general indoor unit.

For example:
Outdoor unit consists of one 28kW module and one 45kW module. Five 14kW duct type units are used as indoor units.
IDU/ODU rated capacity collocation ratio C= 14.0*5/ (28.0+45.0) =96%. The quantity of included IDUs is more than 4 sets. Please refer to the above table.
Additional refrigerant quantity B for 28kW module is 2.0 kg.
Additional refrigerant quantity B for 45kw module is 4 kg.
So, ∑ Refrigerant charging amount B of every module=2.0+4=6 kg.
Suppose the Pipeline charging amount Liquid pipe length x refrigerant charging amount of every 1m liquid pipe=20kg.
Total refrigerant charging amount R=20+6=26kg. For example 2:
Outdoor unit is a 45kW module and the indoor unit is a 45kW fresh air unit. The quantity (B) of refrigerant added to this module is Okg.
So, > Refrigerant charging amount B of every module= Okg.
Suppose the Pipeline charging amount Liquid pipe length x refrigerant charging amount of every 1m liquid pipe = 5kg.
Total refrigerant charging amount R = 5+0=5kg.
Modular combination of outdoor unit subjects to combinations that is currently available.
3.7.2 Refrigerant-charging Method
Refrigerant charging for multi VRF unit includes two parts: pre-charging and start-up charging.
(1) Pre-charging of refrigerant.
Step 1: Connect the pipe of high pressure gauge of the pressure gauge to the detection port of liquid pipe, the pipe of low pressure gauge to the detection port of gas pipe valve, and the pipe of intermediate pressure gauge to the vacuum pump. Put through the power for the vacuum pump to conduct the vacuum drying work.
Step 2: Once vacuum drying is completed, close the high pressure gauge valve and t he low pressure gauge valve. Disassemble the intermediate gauge pipe and the vacuum pump connection end, and then connect the refrigerant tank.
Step 3: Properly loosen the pi pe of intermediate gauge an d the connection end of pressure gauge, slightly open the refrigerant tank valve, and empty the pipe of intermediate gauge. After that, retighten the joint and open the refrigerant tank valve.
Step 4: If the refrigerant tank itself does not have a siphon, then the refrigerant tank needs to be inverted and placed on the electronic scale to record the current weight of m1; if the refrigerant tank itself has a siphon, the refrigerant tank should be kept in an upright state, and record the current weight of m1. Step 5: Open the high pressure gauge valve (the low pressure gauge valve remains closed), charge the system with refrigerant, and record the weight change of the refrigerant tank.
Step 6: When refrigerant tank is over and the refrigerant can’t be charged to the system any more, record the current weight of m2.
Step 7: Close the high pressure gauge valve and replace the refrigerant tank.
Step 8: Re-execute “step 3”.
Step 9: Repeat “step 5” and “step 6” to record the weight of m3 before charging refrigerant and the weight of m4 after charging refrigerant.
Step 10: If the refrigerant cannot be c ontinuously charged into the system and the calculated added am ount of refrigerant hasn ot been fullyc hargedi nto the system, record current total pre-charging amount:
m=(m1-m2) +(m3-m4) +…+(mn-1-mn)
Remained refrigerant for start-up charging m’=M-m
“M” is the calculated total required refrigerant-charging volume.
If the amount of pre-charging refrigerant “m” has reached the total added am ount of refrigerant for the system, close the refrigerant tank valve immediately to complete the refrigerant-charging work. Skip to the “step 11”.
Step 11: Complete the refrigerant-charging work and remove the pressure gauge, etc.
(2) Start-up charging of refrigerant.
Step 1: Close the refrigerant tank valve and reconnect the pipe of pressure gauge. Remove the pipe of low pressure gauge from the check port of gas pipe valve and connect it to the low pressure check valve (as shown in the Fig.). Step 2: Fully open the liquid pipe valve and gas pipe valve of each module.
Step 3: Make the complete unit enter into debugging operation by the debugging software or the main board of outdoor unit. (see the debugging part for the specific operation).
Step 4: When it comes to the procedure of charging refrigerant, open the refrigerant tank valve and charge the residual refrigerant “m’”.
Step 5: When all refrigerant has been charged, close the refrigerant tank valve and wait until the automatic debugging for the complete unit is finished.
Step 6: Once debugging is finished, disassemble the pressure gauge, etc., to complete the refrigerant-charging work.
3.7.3 Precautions on Refrigerant Leakage
(1) Personnel related to airc onditioning engi neering des ign and installation operators must abide by the safety requirement for preventing refrigerant leakage specified in local laws and regulations.
(2) Multi VRF unit adopts R410A refrigerant. When the unit is installed in the place where there are people, the refrigerant mustn ot exceed the maximum allowablec oncentration. Otherwise, p eople involved can be stifled by the refrigerant. For ex ample the maximum allowed concentration Ievel of refrigerant to a hum anly space for R410A according to the appropriate European Standard is limited to 0.44 kg/m°.
The maximum am ount of refrigerant(kg)in the system = The volume of the room (m3) xThe maximum allowed concentration level of refrigerant (kg/m?)
Total amount of refrigerant (kg) in the system = Total additional charging amount (kg) + Amount of refrigerant (kg) which is charged before leaving the factory (for the system consisting of multiple modules in parallel, the accumulative charge quantity of modules before leaving the factory is used)
Total amount of refrigerant (kg) in the system s the maximum amount of refrigerant (kg) in the system
(3) When the total amount of refrigerant in the system is more than the maximum amount of refrigerant, the cooling system should be designed again. In this case, the cooling system canal sob es eparatedi ntos everalc oolings ystems wi ths mall capacity, oradd corresponding ventilation measures or alarming display.1. Flow direction for refrigerant leakage.
2. Room for refrigerant leakage. Since the concentration of refrigerant is greater than that of air, pay attention to the spaces where the refrigerant may residue, for example, the basement.
3.8 Electrical Installation
3.8.1 Notices for Electrical Installation

1. Wiring should conform to national rules. All the parts, materials, electric work should be in accordance with local codes.
2. The special power supply for the air conditioning unit must be used, and the power supply specification must be the same as the rated power supply of the unit.
3. Power cord should be fixed soundly and reliable. Never forcibly pull the power cord.
4. Wire size of power cord should be large enough. The damaged power cord and connecting wire should be replaced by exclusive cable.
5. All the electrical work should be pe rformed by prof essional pers onnel as per I ocal I aw, regulation and this manual.
6. The unit must be grounded reliably and it should comply with the relevant requirements of the local country.
7. Acircuit breaker and a leakage switch that can cut off the power of the entire system must be installed (a single unit must be equipped with a 30 mA leakage switch).
8. Circuit breaker should have both magnetic trip and thermal trip functions so as to protect the unit when short-circuit and overload happens. D-type breaker is advised to be used.
9. As for wiring on site, please refer to the wiring diagram attached on the unit.
10. Wiring between indoor and outdoor units must be properly connected by using the specified wires, and the terminals should not be directly affected by external forces. Poor connection or fixing may cause a fire accident.
11. No connection is allowed in the middle of the wire. When the length of the connection wire is not enough, please contact the designated service store to re-equip a dedi cated wire with sufficient length.

3.8.2 Electrical Parameters
Every unit should have corresponding short-circuit and ov erload protection. And also a main switch is required to control power supply or disconnection. See Fig. 3.8.1.Please refer to the following table for outdoor unit power cord specifications and circuit breakers.

Model| Combination method| Power supply| Capacity of circuit breaker of each combination module (A)| Minimum cross-sectional area of grounding wire (mm2)| Recommended wire (cross-sectional area) (mm2)
---|---|---|---|---|---
model 224| –| 380-415V 3N~ 50/60Hz| 25| 2.5| 2.5×5
model 280| –| 380-415V 3N~ 50/60Hz| 25| 2.5| 2.5×5
model 335| –| 380-415V 3N~ 50/60Hz| 25| 4.0| 4.0×5
model 400| –| 380-415V 3N~ 50/60Hz| 40| 6.0| 6.0×5
model 450| –| 380-415V 3N~ 50/60Hz| 40| 6.0| 6.0×5
model 504| –| 380-415V 3N~ 50/60Hz| 50| 10.0| 10.0×5
model 560| –| 380-415V 3N~ 50/60Hz| 50| 10.0| 10.0×5
model 615| –| 380-415V 3N~ 50/60Hz| 50| 10.0| 10.0×5
model 680| 280+400| 380-415V 3N~ 50/60Hz| 25+40| 2.5+6.0| 2.5×5+6.0×5
model 730| 280+450| 380-415V 3N~ 50/60Hz| 25+40| 2.5+6.0| 2.5×5+6.0×5
model 784| 280+504| 380-415V 3N~ 50/60Hz| 25+50| 2.5+10.0| 2.5×5+10.0×5
model 840| 280+560| 380-415V 3N~ 50/60Hz| 25+50| 2.5+10.0| 2.5×5+10.0×5
model 895| 280+615| 380-415V 3N~ 50/60Hz| 25+50| 2.5+10.0| 2.5×5+10.0×5
model 950| 335+615| 380-415V 3N~ 50/60Hz| 25+50| 4.0+10.0| 4.0×5+10.0×5
model 1015| 400+615| 380-415V 3N~ 50/60Hz| 40+50| 6.0+10.0| 6.0×5+10.0×5
model 1065| 450+615| 380-415V 3N~ 50/60Hz| 40+50| 6.0+10.0| 6.0×5+10.0×5
model 1119| 504+615| 380-415V 3N~ 50/60Hz| 50+50| 10.0+10.0| 10.0×5+10.0×5
model 1175| 560+615| 380-415V 3N~ 50/60Hz| 50+50| 10.0+10.0| 10.0×5+10.0×5
model 1230| 615+615| 380-415V 3N~ 50/60Hz| 50+50| 10.0+10.0| 10.0×5+10.0×5
model 1290| 280+450+560| 380-415V 3N~ 50/60Hz| 25+40+50| 2.5+6.0+10.0| 2.5×5+6.0×5+10.0 x5
model 1345| 280+450+615| 380-415V 3N~ 50/60Hz| 25+40+50| 2.5+6.0+10.0| 2.5×5+6.0×5+10.0 x5
model 1400| 335+450+615| 380-415V 3N~ 50/60Hz| 25+40+50| 4.0+6.0+10.0| 4.0×5+6.0×5+10.0 x5
model 1455| 280+560+615| 380-415V 3N~ 50/60Hz| 25+50+50| 2.5+10.0+10.0| 2.5×5+10.0x 5+10.0×5
model 1510| 280+615+615| 380-415V 3N~ 50/60Hz| 25+50+50| 2.5+10.0+10.0| 2.5×5+10.0x 5+10.0×5
model 1565| 335+615+615| 380-415V 3N~ 50/60Hz| 25+50+50| 4.0+10.0+10.0| 4.0×5+10.0x 5+10.0×5
model 1630| 400+615+615| 380-415V 3N~ 50/60Hz| 40+50+50| 6.0+10.0+10.0| 6.0×5+10.0x 5+10.0×5
model 1680| 450+615+615| 380-415V 3N~ 50/60Hz| 40+50+50| 6.0+10.0+10.0| 6.0×5+10.0x 5+10.0×5
model 1734| 504+615+615| 380-415V 3N~ 50/60Hz| 50+50+50| 10.0+10.0+10.0| 10.0×5+10.0x 5+10.0×5
model 1790| 560+615+615| 380-415V 3N~ 50/60Hz| 50+50+50| 10.0+10.0+10.0| 10.0×5+10.0x 5+10.0×5
model 1845| 615+615+615| 380-415V 3N~ 50/60Hz| 50+50+50| 10.0+10.0+10.0| 10.0×5+10.0x 5+10.0×5
model 1905| 280+450+560+615| 380-415V 3N~ 50/60Hz| 25+40+50+50| 2.5+6.0+10.0+10.0| 2.5×5+6.0×5+10.0 x5+10.0×5
model 1959| 280+504+560+615| 380-415V 3N~ 50/60Hz| 25+50+50+50| 2.5+10.0+10.0+10.0| 2.5×5+10.0x 5+10.0×5+10.0h5
model 2015| 280+560+560+615| 380-415V 3N~ 50/60Hz| 25+50+50+50| 2.5+10.0+10.0+10.0| 2.5×5+10.0x 5+10.0×5+10.0×5
model 2070| 280+560+615+615| 380-415V 3N~ 50/60Hz| 25+50+50+50| 2.5+10.0+10.0+10.0| 2.5×5+10.0x 5+10.0×5+10.0×5
model 2125| 280+615+615+615| 380-415V 3N~ 50/60Hz| 25+50+50+50| 2.5+10.0+10.0+10.0| 2.5×5+10.0x 5+10.0×5+10.0×5
model 2180| 335+615+615+615| 380-415V 3N~ 50/60Hz| 25+50+50+50| 4.0+10.0+10.0+10.0| 4.0×5+10.0x 5+10.0×5+10.0×5
model 2245| 400+615+615+615| 380-415V 3N~ 50/60Hz| 40+50+50+50| 6.0+10.0+10.0+10.0| 6.0×5+10.0x 5+10.0×5+10.0×5
model 2295| 450+615+615+615| 380-415V 3N~ 50/60Hz| 40+50+50+50| 6.0+10.0+10.0+10.0| 6.0×5+10.0x 5+10.0×5+10.0×5
model 2349| 504+615+615+615| 380-415V 3N~ 50/60Hz| 50+50+50+50| 10.0+10.0+10.0+10.0| 10.0×5+10.0x 5+10.0×5+10.0×5
model 2405| 560+615+615+615| 380-415V 3N~ 50/60Hz| 50+50+50+50| 10.0+10.0+10.0+10.0| 10.0×5+10.0x 5+10.0×5+10.0×5
model 2460| 615+615+615+615| 380-415V 3N~ 50/60Hz| 50+50+50+50| 10.0+10.0+10.0+10.0| 10.0×5+10.0x 5+10.0×5+10.0×5

NOTES!

1. Specification of circuit breaker and power cord is selected on the basis of unit’s maximum power (max. current).
2. Specification of power cord is based on the working condition where ambient temperature is 40°C and multi-core copper cable (working temperature is 90°C) is lying on the surface of slot (IEC 60245) .1 fworking condition changes, please adjust the specification ac cording to standard IEC 60245. Power cord used for outdoor unit should not be below standard 60245 IEC57.
3. Copper-core cable must be used.
4. The engineering wiring should meet the requirements of IEC 60364-5-52 to ensure that the line voltage drop meets the requirements and the voltage is not lower than the lower limit of the nominal value of equipment.
5. Specification of circuit breaker i s bas ed ont he work ing c ondition where t he am bient temperature of circuit breaker is 40 ‘C. If working condition is different, please ad just the specification according to national standard.
6. The circuit breaker should include magnetic trip function and thermal trip function so that system can be protected from short circuit and overload.
7. An all-pole disconnection switch having a contact separation of at least 3mm in all poles should be connected in fixed wiring.

3.8.3 Power Cord Connection
3.8.3.1 Power Cord Installation Procedures
Step 1: Pass the external power cord through the wire-passing rubber gasket of the chassis seal board, and connect the power cord’s “L1, L2, L3, N, ” and ground wire to the power wiring board marked with “L1, L2, L3, N, ” respectively and the grounding screw beside the power wiring board. Step 2: Tighten the cable with a cable tie.
Step 3: Please refer to the engineering wiring mark on the unit for the power cord connection.
WARNING!
When the strong wire and the communication line pass through the wire hole, they must be equipped with wire rubber ring.
3.8.3.2 External Wiring Diagram
Each unit should be equipped with a circuit break er for s hort circuit and abno rmal o verload protection. The circuit breaker is normally closed. NOTE!
The maximum connection number “N” of outdoor unit and the maximum connection number “n” of indoor unit are decided by the combination method of outdoor unit. For details, please refer to the part of unit capacity configuration.
3.8.4 Wiring Diagram
Refer to the wiring diagram attached on the unit.
3.9 Communication Line Connection
Adopt CAN bus communication mode between indoor unit and outdoor unit as well among indoor units.
3.9.1 Connection Method of Communication Line Terminal
Communication connections adopts screws for fixing. 3.9.2 Communication Material Selection
NOTE!
If the air conditioning unit is installed in a pl ace with strong electromagnetic interference, the communication line between the indoor unit and the wired controller must adopts shielded wires; the communication line bet ween indoor uni ts (bet ween indoor unit and out door unit) mustuse the shielded twisted pairs.
(1) Selection of communication line between indoor unit and wired controller.

Wire type| Length of communication line between indoor unit and wired controller(m)| Wire diameter (mm2)| Wire standard| Remark
---|---|---|---|---
Light / ordinary PVC sheathed twisted copper core cord| L≤250| 2×0.75~2×1.25| IEC 60227-5:2007| The length of communication line can’t exceed 250m.
Shielded light/ordinary PVC sheathed twisted copper core cord| L≤250| 2×0.75~2×1.25| IEC 60227-5:2007| When the installation environment of the unit is in strong magnetic or strong interference, the shielded wires shall be used.

The connection between the indoor unit and the wired controller is shown as below:(2) Selection of communication line between outdoor unit and indoor unit.

Wire type| Length of communication line between indoor unit and wired controller(m)| Wire diameter (mm2)| Wire standard| Remark
---|---|---|---|---
Light / ordinary PVC sheathed twisted copper core cord| L≤1000| ≥2×0.75| IEC 60227-5:2007| If the wire diameter is increased to 2x1mm2, the length of communication line can’t be increased, while the length of the communication line can’t be more than 1500m.
Shielded light/ordinary PVC sheathed twisted copper core cord| L≤1000| ≥2×0.75| IEC 60227-5:2007| When the installation environment of the unit is in strong magnetic or strong interference, the shielded wires shall be used.

3.9.3 Communication Line Connection
Communication bus connection between indoor unit and outdoor unit must be connected in series, rather than star connection; the endmost indoor unit of communication bus between indoor unit and out door unit must connect with the communication matching r esistor(in the out door unit plastic bag); the fresh air indoor unit is not recommended to be set as the main indoor unit. 3.9.4 Communication Address Setting
The indoor unit and outdoor unit adopt automatic addressing technology. It is not necessary to manually set the address code. it only needs to set the main module and centralized control address (set it when centralized control of multiple refrigeration systems is required).
3.9.5 Communication Connection between IDU and ODU
Communication bet ween IDU and ODU isc onnectedt hrought he D1/D2 po rtof t he communication terminal block.
Central control communication among multiple multi VRF system is connected through G1 and G2 ports on the communication terminal block of main module.
Below are the connection graphics of single unit and modular units: NOTES!

• As for modular indoor unit, if there are multiple outdoor unit modules, the master module must be the first outdoor unit module on the communication line, andi t must not connect to the indoor unit (main module is set by SA8 of indoor unit main board).
• As for modular outdoor unit, if there are multiple outdoor unit modules, the indoor unit must be connected to the last outdoor unit’s slave module (slave unit is set by SA8 of indoor unit main board).
• The communication line and the power cord must be routed separately to avoid interference.
• The communication line must be of suitable length and must not be connected.
• The indoor unit must be connected in series, and the last indoor unit must be connected to the communication matching resistor (provided in the outdoor unit parts list).
• Please refer to the relevant manual for the centralized controller wiring method and settings.

3.9.6 Communication Connection Between Indoor Unit and Wired Controller
There are four types of connection between the indoor unit and wired controller, as shown in the following figure:When two wired controllers control multiple IDUs, the wired controller can be connected to any one 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 when unit is turned on or off, slave controller can be set.
How to setas lave controller: hold “function” button on t he designated controller for 5s, and temperature z one di splays C00. Cont inue hol ding “f unction” but ton for 5s and s etting screen of controller parameter will come out. Default temperature zone displays POO.
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.
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| Parameter scope| Default value| Remark
---|---|---|---|---
P13| Set up address for wired controller| 01: master wired controller
02: slave wired controller| 01| When 2 wired controllers control one or more IDUs, they shall have different addresses. Slave wired controller (02) can’t set up units’ parameters except its address.

3.9.7 Other Communication Connection Methods
For the communication connection among indoor units, between ducted type indoor unit and the receiving light board, please refer to the indoor unit manual.
3.10 Check Items after Installation

Is the voltage in accordance with the rated voltage specified on the nameplate?| It may cause malfunction or damage the part.|
Is the electric wiring and pipe connection installed correctly and securely?| It may cause malfunction or damage the part.|
Has the unit been earthed securely?| It may cause electrical leakage.|
Is the power cord specified?| It may cause malfunction or damage the part.|
Has the inlet and outlet been blocked?| It may cause insufficient cooling/heating capacity.|
Has the pipe length and refrigerant charging amount been recorded?| The refrigerant charging amount is not accurate.|
Is the address code of outdoor modules correct?| The unit can’t run normally. Communication malfunction might happen.|
Is the address code of indoor units and wired controller correct?| The unit can’t run normally. Communication malfunction might happen.|
Has the communication line been connected correctly?| The unit can’t run normally. Communication malfunction might happen.|
Is the pipe connection and valve status right?| The unit can’t run normally.|
Whether phase sequence of external power cord is correct or not?| Operation fault occurs or unit is damaged.|

The above inspectioni tems after installation are the inspection for some keyc omponents.
Please conduct the check according to actual needs.

Debugging and Operation

NOTES!

1. Do set one (only one) module as the main module during debugging.
2. When there is no special requirement, the other functions do not need to be set, and it can be operated according to the factory settings. For s pecial functions, please refer to the related technical documents.
3. Button description: short press: press the button for 3s and then release it; hold the button for 5s: press the button for 5-10s and then release it; hold the button for 10s: press the button for 10s and then release it.

4.1 Preparation before Test Run

1. Installation and debugging operation must comply with the relevant regulations of the local country or region.
2. Debugging must be carried out by a professional or under the guidance of a professional. Do not debug the air conditioning unit by yourself.
3. All scattered objects, especially metal chips, wire ends and clamps, should be removed from the body.
4. Check if the terminals of the electrical components in the unit are loose and the phase sequence is correct.
5. Before debugging, all pipeline valves of the unit are required to be open.
6. Power cannot be supplied until all installation work is completed.

4.2 Notices for Unit Debugging

1. Before conducting the debugging, please ensure that the compressor has been preheated for more than 2 hours, and check whether the preheating is normal by hand. Debugging can be started up onlywh en the pr eheating is nor mal, ot herwise the compressor m ay be damaged.
2. When starting up the debuggi ng, the s ystem aut omatically selects the operat ing mode according to the current ambient temperature.
3. When debugging, the front panel of the outdoor unit must be completely closed, otherwise it will affect the accuracy of debugging (as shown in the Fig. as below).
4. Display instruction for each stage progress at the time of debugging:

Instruction for each stage progress at the time of debugging

——| Debugging code| Progress code| Status code| Meaning
Progress| LED1| LED2| LED3
Code| Display status| Code| Display status| Code| Display status
01 set up master unit| db| ON| 01| ON| A0| ON| Undebugged status.
db| ON| 01| ON| CC| ON| The system hasn’t set master module. It needs to reset it.
db| ON| 01| ON| CF| ON| The system has set more than 2 master modules. It needs to reset it.
db| ON| 01| ON| OC| ON| Master module setting is succeeded. It will automatically enter into the next step.
02 allocate addresses| db| ON| 02| ON| Ad| Flash| The system is conducting the address assignment.
db| ON| 02| ON| OC| ON| Address assignment is succeeded. It will automatically enter into the next step.
03_module qunaity confirmation| db| ON| 03| ON| 01~04| Flash| LED3 displays the module quantity. It needs to manually confirm the module quantity.
db| ON| 03| ON| OC| ON| Once the system module quantity is confirmed, it will automatically enter into the next step for judgment.
04indoor unit’s quantity confirmation| db| ON| 04| ON| ××/ The quantity of online indoor units| Flash| LED3 displays the quantity of online indoor units.
db| ON| 04| ON| OC| ON| Indoor unit’s quantity inspection is finished. Enter into the next step automatically.
05 detect internal communicatio n| db| ON| 05| ON| C2| ON| The system has detected “communication malfunction between main control and inverter compressor driver”.
db| ON| 05| ON| C3| ON| The system has detected “communication malfunction between main control and inverter fan driver”.
db| ON| 05| ON| CH| ON| Indoor/outdoor unit’s “rated capacity ratio is too high”.
db| ON| 05| ON| CL| ON| Indoor/outdoor unit’s “rated capacity ratio is too low”.
db| ON| 05| ON| OC| ON| System inspection is finished. Enter into the next step automatically.
06_ outdoor unit’s internal components confirmation| db| ON| 06| ON| correspod ing error code| ON| The system has detected the fault of outdoor unit’s components.
db| ON| 06| ON| OC| ON| The system detected that there’s no outdoor unit fault. Enter into the next step automatically.
07_indoor unit componets inspection| db| ON| 07| ON| XXXX/cor respoding error code| ON| The system detected an indoor unit fault. XXXX indicates engineering number of fault indoor unit, and the corresponding fault code is displayed 2s later. For example, if there is D5 fault in the No. 100 indoor unit, LED3 displays as follows: 01 (after 2s) 00 (after 2s) d5, and they will be displayed circularly.
---|---|---|---|---|---|---|---
db| ON| 07| ON| OC| ON| The system detected that there’s no outdoor unit fault. Enter into the next step automatically.
08_compress or reheat comfirmation| db| ON| 08| ON| U0| ON| Preheat time for compressor is insufficient.
db| ON| 08| ON| OC| ON| Preheat time for compressor is enough. Enter into the next step automatically.
09refrigerant judge before startup| db| ON| 09| ON| U4| ON| The system refrigerant is insufficient. Please charge the refrigerant until the fault is eliminated.
db| ON| 09| ON| OC| ON| The system refrigerant judge is normal. Enter into the next step automatically.
10 status judgment of main pipeline before starting| db| ON| 10| ON| ON| ON| Starting up the operation.
db| ON| 10| ON| U6| ON| Main pipeline status is abnormal.
db| ON| 10| ON| OC| ON| Main pipeline status is normal.
11 reserved function| db| ON| 11| ON| AE| ON| ——
12 reserved function| db| ON| 12| ON| 01| ON| ——
13~15_pilot run stage| db| ON| 13/14/15| ON| AC| ON| Test run under heating mode.
db| ON| 13/14/15| ON| AH| ON| Test run under cooling mode.
db| ON| 13/14/15| ON| Correspo nding error code| ON| There is fault in the pilot run stage. Note: fault module display.
db| ON| 13/14/15| ON| J0| ON| There is fault in the pilot run stage. Note: non-fault module display.
db| ON| 13/14/15| ON| XXXX/U8| ON| The system detected the indoor unit’s pipeline is abnormal. XXXX indicates the engineering number of fault indoor unit. Error code U8 is displayed after 2s. For example, if the U8 fault occurs in the No. 100 indoor unit, LED3 displays as follows: 01 (after 2s) 00 (after 2s) U8, and they will be displayed circularly.

Note: In the pilot run s tage, the unit will display corresponding procedures according to actual circumstances.
When master module displays as below, the complete unit has conducted the debugging and it stays at the standby status.

the unit is under standby status. LED1 displays module address; LED2 and LED3 displays “OF”.

4.3 Basic Introduction for Engineering Debugging
4.3.1 Debugging Method
DC inverter multi VRF unit has three debugging methods at present:

1. Conduct it by pressing the buttons on the main board of outdoor unit.
2. Install proprietary software to conduct the debugging through PC. Indoor and outdoor units’ parameters displayed simultaneously through PC software.
3. Use multi-functional debugger.

NOTE!
As for the detailed oper ation method for debug ging, please refer to corresponding instruction manual.
4.3.2 Debugging Through the Main Board of Outdoor Unit
When conducting the debugging through the main board of outdoor unit, the main board has the following debugging operation functions.
Step 1: Cover all the front panels of the outdoor unit and o pen the debugging window of each basic module.
Step 2: When the outdoor unit is powered off, set one of the modules as the master module. For the setting method, see “Master Module DIP Switch Code Setting (SA8_MASTER-S)”.
Step 3: Under the power-on state of the out door unit, set the corresponding static p ressure module for the unit according to the design requirements of the outdoor static pressure of the project.
Step 4: The module address is displayed as “01” is the master module. On the master module, press and hold the SW3 confirmation button for 5 seconds or press the SW3 confirmation button for more than 10 seconds to enter the unit debugging function.
Step 5: Wait. The unit automatically runs the steps 01 and 02 at this time.
If the master module is set incorrectly in step 01, the following corresponding fault is displayed in step 01:

in the system. It needs to reset it.
db| ON| 01| ON| CF| ON| More than two master modules are set in the system and it needs to reset it.
db| ON| 01| ON| OC| ON| Mater module of system has been set successfully. Enter into the next step  automatically.

According to the above fault phenom enon, reset the master module according to the setting method of “M aster Module DIPS witch Code S etting (S A8_MASTER-S)’, and re-enter into the debugging after setting.
During the assignment process, all module digital tubes displays are as below:

Step 6: When the unit is running to step 03, it displays the number of modules connected to the outdoor connection. At this time, the main board of each module is displayed as below:

After 30s of display, the automatic display is as follows; if press SW3 button within 30s, the display is as follows. The unit automatically enters the next step of debugging:

NOTE!
tis important to confirm that the number of online outdoor unit modules is the same as that of actual modules; otherwise it will need to conduct the inspection and debugging again.
Step 7: When the unitis running to step 04, the number of online connected indoor unitis displayed. At this time, the main board of each module is displayed as below:

After 30s of display, the display is as follows; if press SW3 button within 30s, the display is as follows. The unit automatically enters the next step of debugging:

NOTE!
It is important to confirm that the number of online indoor unit modules is the same as that of actual connected indoor units for the project; otherwise it will need t o conduct the inspection and debugging again.
Step 8: Step 05 of the unit debugging is “confirmation of internal communication of outdoor unit”. if there is no abnormality in the detection, the display is below, and then it automatically enters the next step of detection.

inspection is completed, it will enter into the next step automatically.

If an abnorm ality is det ected, it wills tayin the current state and m anual troubleshooting is required. The corresponding faults are as below:

detected “communication malfunction between main control and inverter compressor driver”.
db| ON| 05| ON| C3| ON| The system has detected “communication malfunction between main control and inverter fan driver”.
db| ON| 05| ON| CH| ON| Indoor/outdoor units’ rated capacity ratio is too high.
db| ON| 05| ON| CL| ON| Indoor/outdoor units’ rated capacity ratio is too low.

Refer to the part of “Troubleshooting” for the corresponding troubleshooting method.
Step 9: The unit debugging step 06 is “outdoor unit’s parts inspection”.
If there is no abnormality in the detection, the display is below, and then it automatically enters the next step of detection.

detected that there’s no fault for outdoor unit’s parts. Then it will automatically enter into the next step.

If an abnor mality is det ected, it will stay in the current state and m anual troubleshooting is required. The corresponding faults are as below:

Refer to the part of “Troubleshooting” for the corresponding troubleshooting method.
Step 10: The unit debugging step 07 is “indoor unit’s parts inspection”.
If there is no abnormality in the detection, the display is as below, and then it automatically enters the next step of detection.

that there’s no fault for indoor unit’s parts. Then it will automatically enter into the next step.

If an abnor mality is det ected, it will stay in the current state and m anual troubleshooting is required. The corresponding faults are as below:

XXXX indicates the engineering no. of fault indoor unit. 3s later, the corresponding error code will be displayed. For example, if d5 fault occurs for No.100 indoor unit, LED3 displays as below: 01 (2s later) 00(2s later) d5, and they will display like that circularly.
Refer to the part of “Troubleshooting” for the corresponding troubleshooting method.
Step 11: The debugging step 08 is “compressor preheat confirmation’.
If the preheat time has reached for 2h, the display is as below. Then it will enter into the next step for inspection.

preheat time has reached 2h, and then it will enter into the next step.

If the preheat time for compressor hasn’t reached 2h, there will be abnormal phenomenon. The display is as below.

for compressor hasn’t reached 2h.

Step 12: Unit debugging step 09 is “refrigerant judgment before startup”.
If the amount of refrigerant inside the system satisfies the requirements for starting the operation, the display is as below. Then it will automatically enter into the next step.

refrigerant judgment is normal. It will automatically enter into the next step.

If thereis noref rigerantin thes ystem or the am ountof ref rigerant does notmeet the requirements for starting operation, the unit will display U4 “Refrigerant-lacking protection”, as shown below. The unit will enter into the next step. At this time, it is necessary to check whether there is a leak or charge some refrigerant until the abnormality is eliminated.

refrigerant in the system is insufficient. Please charge refrigerant until the fault disappears.

Step 13: Unit debugging step 10 is “status judgment of main pipeline before starting’.
If the main module displays as below, it indicates the unit is starting the operation for judgment.

Starting and operating

If the unit has detected the abnormal status, the display is as below:

Main pipeline is abnormal

At this time, it is necessary to check whether the gas valve and the liquid valve are completely open or whether the main pipeline is blocked. Once inspection is completed, you can return to the previous step by pressing SW4 button to re-enter the judgment.
If inspection valve of the unit is normal, the display is as below. The unit will automatically enter into the next step.

The main pipeline is turned on normally

Step 14: Unit debugging step 11 is “reserved function”.
The main module display is as below. The unit automatically enters into the next step.

Step 15: Unit debugging step 12 is “reserved function’.
The master module display is as below. Then the unit automatically enters into the next step.

Step 16: After the unit debugging method is confirmed, the system automatically selects cooling or heating mode according to the ambient temperature.
Once cooling/heating mode is selected, the relevant display is as below.

run stage. Note: fault module display
db| ON| 13/14/15| ON| J0| ON| There’s fault on pilot run stage. Note: non- fault module display
db| ON| 13/14/15| ON| U9| ON| Outdoor unit’s pipeline or valve is abnormal.
db| ON| 13/14/15| ON| XXXX/ U8| ON| The system detected the indoor unit’s pipeline is abnormal. XXXX indicates engineering number of fault indoor unit. 2s later, U8 fault occurred for No. 100 indoor unit. LED3 will display as below: 01 (2s later) 00 (2s later) U8, and it will display like that circularly.

Note: In the pilot run stage, the unit will display corresponding procedures according to actual circumstances.

stays at standby status. LED1 displays module address; LED2 and LED3 displays “OF”.

Once debugging is completed, resume the standby status and the display is as below:
Once the debugging for the complete unit is finished, please set relevant functions for the unit according to the actual functional requirements of the project. Refer to relative technical materials for the detailed operation method. If there is no special requirement, skip this step directly.
When delivery it to the user for operation, explain the precautions to the user.
4.4 Parameter Judgment Reference Value for Unit Normal Operation

Debugging Parameter Reference Value for DC Inverter VRF Unit

No.| Debugging item| Parameter name| Unit| Reference value| Remark
1| System parameter| Outdoor unit’s parameter| Outdoor ambient temperature| °C| ——| ——
2| Discharge pipe temperature of inverter compressor 1| °C| ● When the compressor starts running, the normal discharge pipe of cooling or shell top temperature is 70~95°C, above 10°C higher than the saturation temperature of system high pressure; the normal heating temperature is 65~90 °C, above 10°C higher than the saturation temperature of system high pressure.| ——
3| Shell top tube temperature of inverter compressor 1| °C| ——
4| Discharge pipe temperature of inverter compressor 2| °C| ——
5| Shell top tube temperature of inverter compressor 2| °C| ——
6| Temperature of defrosting temperature sensor| °C| ● When the system is running in cooling mode, the temperature of defrosting temperature sensor is 5~11°C lower than system high pressure;
● When the system is running in heating mode, the temperature difference between the defrosting temperature sensor and the system low pressure is about 2°C.| ——
7| System high pressure| °C| ● The normal high pressure value of the system is 20°C~55°C. According to the change of ambient temperature and the change of operating capacity of the system, the high pressure value of the system is 10ć~40ć higher than the ambient temperature. The higher the ambient temperature, the smaller the temperature difference;
● When the unit operating in the cooling mode at the ambient temperature of 25~35°C, the system high pressure value is 44~56°C;
● When the unit operating in the heating mode at the ambient temperature of -5~10°C, the system high pressure value is 40~56°C;| ——
8| System low pressure| °C| ●  When the unit operating in the cooling mode at the ambient temperature of 25~35°C, the system low pressure value is 0~8°C;
●  When the unit operating in the heating mode at the ambient temperature of -5~10°C, the system low pressure value is -15~5°C;| ——
9| Opening of electronic expansion valve of heating|

PLS

| ● During cooling operation, the electronic expansion valve of heating is 3000PLS;
● During heating operation, the adjustable range of the opening of electric expansion valve opening is 720~3000PLS.| ——
10| Operation frequency of inverter compressor| Hz| ● Change among 20Hz~140Hz| ——
11| IPM module temperature of inverter compressor| °C| ● IPM module temperature is lower than 80ć. The highest temperature doesn’t exceed 95°C.| ——
12| System parameter| Outdoor unit’s parameter| Drive bus voltage of inverter compressor| V| ● The normal bus voltage is 1.414 times of the power supply voltage. For example, if the three-phase power supply voltage is 390V, then the rectified bus voltage is: 390V X 1.414 = 551V. The normal deviation between the measured value and the calculated value within 15V.| ——
---|---|---|---|---|---|---
13| Fan operation frequency|

Hz

| ● Adjust the operation in the range of 0~90Hz according to the system pressure adjustment.| ——
14| Indoor unit’s parameter| Inlet tube temperature of indoor heat exchanger| °C| ● According to the ambient temperature, the inlet temperature is 1°C~7°C lower than the outlet temperature for the same indoor unit under cooling mode.
● The inlet temperature is 1°C~7°C lower than the outlet temperature for the same indoor unit under the heating mode.| ——
15| Outlet tube temperature of indoor heat exchanger| °C| ——
16| Opening of indoor electronic expansion valve| PLS| ●  2000PLS electronic expansion valve: the opening is adjusted automatically in the range of 200~2000PLS;
●  480PLS electronic expansion valve: the opening is adjusted automatically in the range of 70~480PLS.| ——
17| Drainage system| ——| —| ● The indoor unit drains smoothly and thoroughly, and the condensate water pipe has no slope water storage; the outdoor unit can drain water from the drain pipe without dripping directly from the unit foundation.| ——
18| Other| ——| —| ●  There is no abnormal noise for the operation of the compressor, indoor fan and outdoor fan. The unit is running normally.| ——

Operation Instruction

For instructions on ho w to use the air conditioner, please refer to the user manual of wired controller or remote controller.

Maintenance

Regular inspection and maintenance can extend the service life of the air conditioning unit.
6.1 Heat Exchanger of Outdoor Unit
The heat exchanger of outdoor unit should be cleaned regularly. A vacuum cleaner can be used with a nylon brush to clean dust and debris from the surface of the heat exchanger. If there is compressed air source, the compressed air can be used to blow dust from the surface of the heat exchanger. Do not wash it with tap water.
6.2 Drain Pipe
The drain pipe should be checked regularly to allow the condensate to drain smoothly.
6.3 Precautions at the Beginning of Using Season

1. Check whether all air inlet and air outlet of indoor unit and outdoor unit are not blocked.
2. Check if the grounding is reliable.
3. Check if the battery of the remote controller has been replaced.
4. Check if the air filter is properly installed.
5. When restart up t he unit after it has been stop operation for along time, turn ont he air conditioner’s power switch 2 hours before starting the op eration to pre heat t he out door compressor crankcase.
6. Check if the outdoor unit is installed firmly. If there is any abnormality, please contact AlpicAir service center.

6.4 Maintenance at the End of Using Season

1. Cut off the main power of the air conditioning unit.
2. Clean the filter and indoor and outdoor units’ body.
3. Remove dust and debris from indoor and outdoor units.
4. If the outdoor unit is rusted, smear the oil paint to prevent it from expansion.

6.5 Parts Replacement
Accessories are available through the nearby AlpicAir office or AlpicAir dealer.
  NOTE!
Do not mix dangerous gases such as oxygen and acetylene into the refrigeration circuit during air tightness and leak test! To avoid danger, it is best to use nitrogen for such tests.

Troubleshooting

7.1 Common Malfunction and Troubleshooting
Check the following items before asking for repair.

wired controller
Fan speed is set too low| Adjust setting at wireless remote controller or wired controller
Wind direction is not correct| Adjust setting at wireless remote controller 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

NOTE!
If problem cannot be solved after checking the above items, please contact AlpicAir service center and show phenomena and models.
Following circumstances are not malfunction.

rapidly
Noise is emitted| Slightc racking s ound is heard when just t urned on| It is noise when electronic expansion valve initialization
There is consecutive sound when cooling| That’s sound for gas refrigerant flowing in unit
There is sound when unit starts or stops| That’s sound for gas refrigerant stops to flow
There is s light and c onsecutive s ound when unit is running or after running| That’s sound for operation of drainage system
Cracking sound is heard when unit is operating and after operating| That’s soundc aused by expansion of p anel and other parts due to temperature change
The unit blows out duct| When un it runs af ter no operation for along period| Dust in indoor unit is blew out
The unit emits odor| Operating| The room odor abs orbed by the uni ti sblew out again
Indoor unit still runs after switch off| After everyi ndoor uni tr eceive ” stop” s ignal, f an will keep running| Indoor fan motor will keep running 20-70s so as to take good use of excess cooling and heating and prepare for next operation
Mode conflict| COOL or HEAT mode can’t be operated| When the indoor oper ating modec onflicts with that of outdoor unit, indoor fault indicator will flash a nd conflict will be s hown on the wired controller af ter 5 m inutes. Indoor unit stops to run and meanwhile change out door operating mode as 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.

7.2 Error Indication
NOTE!
For specific uni tfaultand maintenance, please ref er to the engi neering d ebugging and after-sales maintenance manual of DC inverter VRF unit.

protection
L6| Mode conflict| L7| No main IDU
L8| Power supply is insufficient| L9| For single control over multiple units, number of IDU is inconsistent (HBS network)
LA| For single control over multiple units, IDU series is inconsistent (HBS network)| LH| Alarm due to bad air quality
LC| IDU is not matching with outdoor unit| LL| Malfunction of water flow switch
LE| Rotation speed of EC DC water pump is abnormal| LF| Malfunction of shunt valve setting
LJ| Setting of functional DIP switch code is wrong| LP| Zero-crossing malfunction of PG motor
LU| Zero-crossing malfunction of PG motor| Lb| For single control over multiple units, IDU is inconsistent (reheating-dehumidifying system)
d1| Indoor PCB is poor| d2| Malfunction of lower water temperature sensor of water tank
d3| Malfunction of ambient temperature sensor| d4| Malfunction of entry-tube temperature sensor
d5| Malfunction of mid-tube temperature sensor| d6| Malfunction of exit-tube temperature sensor
d7| Malfunction of humidity sensor| d8| Malfunction of water temperature sensor
d9| Malfunction of jumper cap| dA| Web address of IDU is abnormal
dH| PCB of wired controller is abnormal| dC| Setting capacity of DIP switch code is abnormal
dL| Malfunction of air outlet temperature sensor| dE| Malfunction of indoor CO2 sensor
dF| Malfunction of upper water temperature sensor of water tank| dJ| Malfunction of backwater temperature sensor
dP| Malfunction of inlet tube temperature sensor of generator| dU| Malfunction of drainage pipe temperature sensor of generator
db| Debugging status| dd| Malfunction of solar power temperature sensor
dn| Malfunction of swing parts| dy| Malfunction of water temperature sensor
y1| Malfunction of entry-tube temperature sensor 2| y2| Malfunction of exit- tube temperature sensor 2
y7| Malfunction of fresh air inlet temperature sensor| y8| Malfunction of IDU’s air box sensor
yA| Malfunction of IFD| o1| Low-voltage protection of IDU’s bus bar
o2| High-voltage protection of IDU’s bus bar| o3| IPM module protection of IDU
o4| Failure startup of IDU| o5| Over-current protection of IDU
o6| Malfunction of current detection circuit of IDU| o7| Desynchronizing protection of IDU
o8| Communication malfunction of IDU’s driver| o9| Communication malfunction of IDU’s main control
——| Error Code| Content| Error Code| Content
---|---|---|---|---
Indoor| oA| Drive IPM high temperature protection of IDU| ob| Malfunction of drive temperature sensor of IDU
oC| Malfunction of charging loop of IDU| o0| Other malfunction of drive
Outdoor| E0| Malfunction of ODU| E1| High-pressure protection
E2| Discharge low-temperature protection| E3| Low-pressure protection
E4| High discharge temperature protection of compressor| Ed| Drive IPM low temperature protection
F0| Main board of ODU is poor| F1| Malfunction of high-pressure sensor
F3| Malfunction of low-pressure sensor| F5| Malfunction of discharge temperature sensor of compressor 1
F6| Malfunction of discharge temperature sensor of compressor 2| F7| Malfunction of discharge temperature sensor of compressor 3
F8| Malfunction of discharge temperature sensor of compressor 4| F9| Malfunction of discharge temperature sensor of compressor 5
FA| Malfunction of discharge temperature sensor of compressor 6| FC| Current sensor of compressor 2 is abnormal
FL| Current sensor of compressor 3 is abnormal| FE| Current sensor of compressor 4 is abnormal
FF| Current sensor of compressor 5 is abnormal| FJ| Current sensor of compressor 6 is abnormal
FP| Malfunction of DC motor| FU| Malfunction of casing top temperature sensor of compressor 1
Fb| Malfunction of casing top temperature sensor of compressor 2| Fd| Malfunction of exit tube temperature sensor of mode exchanger
Fn| Malfunction of inlet tube temperature sensor of mode exchanger| J0| Protection for other modules
J1| Over-current protection of compressor 1| J2| Over-current protection of compressor 2
J3| Over-current protection of compressor 3| J4| Over-current protection of compressor 4
J5| Over-current protection of compressor 5| J6| Over-current protection of compressor 6
J7| Gas-mixing protection of 4-way valve| J8| High pressure ratio protection of system
J9| Low pressure ratio protection of system| JA| Protection because of abnormal pressure
JC| Water flow switch protection| JL| Protection because high pressure is too low
JE| Oil-return pipe is blocked| JF| Oil-return pipe is leaking
b1| Malfunction of outdoor ambient temperature sensor| b2| Malfunction of defrosting temperature sensor 1
b3| Malfunction of defrosting temperature sensor 2| b4| Malfunction of liquid outlet temperature sensor of sub-cooler
b5| Malfunction of gas outlet temperature sensor of sub-cooler| b6| Malfunction of inlet tube temperature sensor of vapor liquid separator
b7| Malfunction of exit tube temperature sensor of vapor liquid separator| b8| Malfunction of outdoor humidity sensor
b9| Malfunction of gas temperature sensor of heat exchanger| bA| Malfunction of oil-return temperature sensor 1
bH| Clock of system is abnormal| bE| Malfunction of inlet tube temperature sensor of condenser
bF| Malfunction of outlet tube temperature sensor of condenser| bJ| High- pressure sensor and low-pressure sensor are connected reversely
bP| Malfunction of temperature sensor of oil-return 2| bU| Malfunction of temperature sensor of oil return 3
bb| Malfunction of temperature sensor of oil return 4| bd| Malfunction of gas inlet temperature sensor of sub-cooler
bn| Malfunction of liquid inlet temperature sensor of sub-cooler| P0| Malfunction of driving board of compressor
P1| Driving board of compressor operates abnormally| P2| Voltage protection of driving board power of compressor
Outdoor| P3| Reset protection of driving module of compressor| P4| Drive PFC protection of compressor
---|---|---|---|---
P5| Over-current protection of inverter compressor| P6| Drive IPM module protection of compressor
P7| Malfunction of drive temperature sensor of compressor| P8| Drive IPM high temperature protection of compressor
P9| Desynchronizing protection of inverter compressor| PA| Malfunction of drive storage chip of compressor
PH| High-voltage protection of compressor’s drive DC bus bar| PC| Malfunction of current detection circuit drive of compressor
PL| Low voltage protection for DC bus bar of drive of compressor| PE| Phase- lacking of inverter compressor
PF| Malfunction of charging loop of driven of compressor| PJ| Failure startup of inverter compressor
PP| AC current protection of inverter compressor| PU| AC input voltage of drive of inverter compressor
H0| Malfunction of driving board of fan| H1| Driving board of fan operates abnormally
H2| Voltage protection of driving board power of fan| H3| Reset protection of driving module of fan
H4| Drive PFC protection of fan| H5| Over-current protection of inverter fan
H6| Drive IPM module protection of fan| H7| Malfunction of drive temperature sensor of fan
H8| Drive IPM high temperature protection of fan| H9| Desynchronizing protection of inverter fan
HA| Malfunction of drive storage chip of inverter outdoor fan| HH| High- voltage protection of fan’s drive DC bus bar
HC| Malfunction of current detection circuit of fan drive| HL| Low voltage protection of bus bar of fan drive
HE| Phase-lacking of inverter fan| HF| Malfunction of charging loop of fan drive
HJ| Failure startup of inverter fan| HP| AC current protection of inverter fan
HU| AC input voltage of drive of inverter fan| G0| PV reversed connection protection
G1| PV anti-islanding protection| G2| PV DC overcurrent protection
G3| PV power generation overload| G4| PV leakage current protection
G5| Phase-lacking protection at power grid side| G6| PV LVRT
G7| Grid over/underfrequency protection| G8| Overcurrent protection at power grid side
G9| Drive IPM module protection at power grid side| GA| Low/high input voltage protection at power grid side
GH| Photovoltaic DC/DC protection| GC| Photovoltaic DC hardware overcurrent protection
GL| Grid side hardware overcurrent protection| GE| High or low photovoltaic voltage protection
GF| DC bus neutral-point potential unbalance protection| GJ| Grid side module high-temperature protection
GP| Grid side temperature sensor protection| GU| Charging circuit protection
Gb| Grid side relay protection| Gd| Grid side current side protection
Gn| Insulation resistance protection| Gy| Power protection (PV)
Debugging| U0| Preheat time of compressor is insufficient| U2| Wrong setting of ODU’s capacity code/jumper cap
U3| Power supply phase sequence protection| U4| Refrigerant-lacking protection
U5| Wrong address for driving board of compressor| U6| Alarm because valve is abnormal
U8| Malfunction of pipeline for IDU| U9| Malfunction of pipeline for ODU
Debugging| UC| Setting of main IDU is succeeded| UL| Emergency operation DIP switch code of compressor is wrong
---|---|---|---|---
UE| Charging of refrigerant is invalid| UF| Identification malfunction of IDU of mode exchanger
Ud| Drive board of grid-connection is abnormal| Un| Communication malfunction between the drive board of grid-connection and the main board
C0| Communication malfunction between IDU, ODU and IDU’s wired controller| C1| Communication malfunction between main control and DC-DC controller
C2| Communication malfunction between main control and inverter compressor driver| C3| Communication malfunction between main control and inverter fan driver
C4| Malfunction of lack of IDU| C5| Alarm because project code of IDU is inconsistent
C6| Alarm because ODU quantity is inconsistent| C7| Abnormal communication of converter
C8| Emergency status of compressor| C9| Emergency status of fan
CA| Emergency status of module| CH| Rated capacity is too high
CC| No main unit| CL| The matching ratio of rated capacity for IDU and ODU is too low
CE| Communication malfunction between mode exchanger and IDU| CF| Malfunction of multiple main control units
CJ| Address DIP switch code of system is shocking| CP| Malfunction of multiple wired controller
CU| Communication malfunction between IDU and the receiving lamp| Cb| Overflow distribution of IP address
Cd| Communication malfunction between mode exchanger and ODU| Cn| Malfunction of network for IDU and ODU of mode exchanger
Cy| Communication malfunction of mode exchanger| –| –
Status| A0| Unit waiting for debugging| A2| Refrigerant recovery operation of after-sales
A3| Defrosting| A4| Oil-return
A6| Heat pump function setting| A7| Quiet mode setting
A8| Vacuum pump mode| AH| Heating
AC| Cooling| AL| Charge refrigerant automatically
AE| Charge refrigerant manually| AF| Fan
AJ| Cleaning reminding of filter| AP| Debugging confirmation when starting up the unit
AU| Long-distance emergency stop| Ab| Emergency stop of operation
Ad| Limit operation| An| Child lock status
Ay| Shielding status| n0| SE operation setting of system
n3| Compulsory defrosting| n4| Limit setting for max. capacity/output capacity
n5| Compulsory excursion of engineering code of IDU| n6| Inquiry of malfunction
n7| Inquiry of parameters| n8| Inquiry of project code of IDU
n9| Check quantity of IDU on line| nA| Heat pump unit
nH| Heating only unit| nC| Cooling only unit
nE| Negative code| nF| Fan model
nJ| High temperature prevention when heating| nU| Eliminate the long-distance shielding command of IDU
nb| Bar code inquiry| nn| Length modification of connection pipe of ODU

After-sales Service

In case the air-conditioning unit you bought has any quality problem or you have any inquiry, please contact the local after-sales service agency designated by AlpicAir.
Warranty should meet the following requirements:

1. First run of the unit should be operated by professional personnel from AlpicAir appointed service center.
2. Only AlpicAir manufactured 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 fails to obey any item mentioned above.

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