Lennox VRF VEC027N432U User manual

Mini VRF

Cooling Only System

User Manual

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and keep it for further reference.

VEC027N432U

VEC034N432U

VEC042N432U

VEC048N432U

VEC055N432U

VEC060N432U

To Users

Thank you for selecting LENNOX’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 is not intended for use by persons (including children) with reduced physical,

sensory or mental capabilities, or lack of experience and knowledge, unless they have been

given supervision or instruction concerning use of the appliance by a person responsibility

for their safety. Children should be supervised to ensure that they do not play with the

appliance.

(2) In order to ensure reliability of product, the product may consume some power under

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 nameplate of product (model, cooling/heating capacity, product No.,

ex-factory date).

2) Malfunction status (specify the situations before and after the error occurs).

(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 LENNOX.

Exception Clauses

Manufacturer will bear no responsibilities when personal injury or property loss is caused by the

following reasons:

(1) Damage the product due to improper use or misuse of the product.

(2) Alter, change, maintain or use the product with other equipment without abiding by the

instruction manual of manufacturer.

(3) After verification, the defect of product is directly caused by corrosive gas.

(4) After verification, defects are due to improper operation during transportation of product.

(5) Operate, repair, maintain the unit without abiding by instruction manual or related

regulations.

(6) After verification, the problem or dispute is caused by the quality specification or

performance of parts and components that produced by other manufacturers.

(7) The damage is caused by natural calamities, bad using environment or force majeure.

Contents

1 Safety Notices (Please be sure to abide)................................................................. 1

2 Product Introduction ................................................................................................. 3

2.1 Names of Main Parts ........................................................................................................ 3

2.2 Combinations of Indoor and Outdoor Units ....................................................................... 4

2.3 Operating Range .............................................................................................................. 4

3 Preparation before Installation ................................................................................. 4

3.1 Standard Parts.................................................................................................................. 5

3.2 Installation Site ................................................................................................................. 5

3.3 Piping Work Requirements ............................................................................................... 6

4 Installation Instruction .............................................................................................. 6

4.1 Dimension of Outdoor Unit and Mounting Hole ................................................................. 7

4.2 Connection Pipe ............................................................................................................... 8

4.3 Installation of Connection Pipe.........................................................................................12

4.4 Disassembly of Compressor Feet ....................................................................................16

4.5 Vacuum Pumping, Refrigerant Adding .............................................................................16

4.6 Electric Wiring..................................................................................................................18

5 Check Items after Installation and Test Operation................................................ 21

5.1 Check Items after Installation...........................................................................................21

5.2 Test Operation and Debugging ........................................................................................21

6 Common Malfunctions and Troubleshooting........................................................ 26

7 Error Indication ........................................................................................................ 27

8 Maintenance and Care............................................................................................. 29

8.1 Outdoor Heat Exchanger .................................................................................................29

8.2 Drain Pipe........................................................................................................................30

8.3 Notice before Seasonal Use ............................................................................................30

8.4 Maintenance after Seasonal Use .....................................................................................30

8.5 Parts Replacement ..........................................................................................................30

9 After-sales Service................................................................................................... 30

DC Inverter Multi VRF System

1 Safety Notices (Please be sure to abide)

WARNING: If not abide strictly, it may cause severe damage to the unit or the people.

NOTE! If not abide 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.

WARNING!

This product can’

t be installed at corrosive, inflammable or explosive environment or the

place with special requirements, such as kitchen. Otherwise, it will affect the normal operation

or shorten the service life of the unit, or even cause fire hazard or serious injury. As for above

special places, please adopt special air conditioner with anti-corrosive or anti-explosion

function.

Please install the unit

according to instructions in this

manual. Read this manual

carefully before starting up or

checking the machine.

Installation should be

performed by distributor or

qualified technicians. Do not

install the product by yourself.

Improper installation may

result in water leakage, electric

shock or fire hazard.

Before installation, please

check the power cord if it

complies with the power

supply requirement on the

nameplate. Make sure the

power supply is safe.

This air conditioner must be

properly grounded through the

receptacle to avoid electric

shock. The ground wire

shouldn’t be connected with

gas pipe, water pipe, lightning

arrester or telephone line.

When installing, specialized

parts and accessories must be

used. Otherwise, it may result

in water leakage, electric

shock or fire hazard.

R410A refrigerant can produce

poisonous gas once it meets

fire, so please ventilate the

room immediately if refrigerant

leaks out during installation.

Diameter of power cord must

be large enough. Damaged

power cord or connecting wire

must be replaced by

specialized electric cable.

After the power cord is

connected, please install the

cover of electric box to avoid

danger.

Nitrogen must be charged

according to technical

requirements.

Short circuit is forbidden. Do

not cancel the pressure switch,

otherwise unit may be

damaged.

DC Inverter Multi VRF System

For units with wired

controllers, do not connect

power supply until the wired

controller is well installed.

Otherwise, the wired controller

cannot be used.

When installation is finished,

please check and make sure

the drain pipe, pipeline and

electric wire are all well

connected so as to avoid

water leakage, refrigerant

leakage, electric shock and fire

hazard.

Do not extend fingers or

objects into air outlet or return

air grille.

If you use gas heater or

petroleum heater in the same

room, please open the door or

window to maintain good air

circulation, otherwise the room

may be lack of oxygen.

Never start or stop the air

conditioner by inserting or

removing the power cord.

Do not turn off the air

conditioner until it runs for at

least 5 minutes. Otherwise, oil

return of the compressor will

be affected.

Children are not allowed to

operate the air conditioner.

Do not operate the air

conditioner with wet hands.

Please turn off and unplug

your air conditioner before

cleaning. Otherwise, it may

cause electric shock or

personal injury.

Do not spray water on the air

conditioner or it will cause

malfunction or electric shock.

Do not expose the air

conditioner directly under

damp or corrosive

surroundings.

Connect power 8 hours before

operation. Do not disconnect

power when you want to stop

the unit in a short period of

time, e.g. in one night (This is

for protecting the compressor).

Volatile liquid like thinner or

gasoline will damage the

appearance of air conditioner

(Please use soft dry cloth and

wet cloth with mild detergent to

clean unit’s outer case).

Under cool mode, do not set

the indoor temperature too

low. Keep the difference

between indoor temp and

outdoor temp within 5°C.

DC Inverter Multi VRF System

If abnormal condition occurs

(e.g. unpleasant smell), please

turn off the unit at once and

disconnect power supply.

Then contact LENNOX authorized

service center. If the air

conditioner continues to

operate despite of abnormal

condition, it may be damaged

and cause electric shock or

fire hazard.

Do not repair the air

conditioner by yourself.

Improper repair will cause

electric shock or fire hazard.

Please contact LENNOX

authorized service center and

ask professional technicians to

repair it.

This appliance can be used by children aged from 8 years and above and persons with reduced physical, sensory or

mental capabilities or lack of experience and knowledge if they have been given supervision or instruction concerning

use of the appliance in a safe way and understand the hazards involved. Children shall not play with the appliance.

Cleaning and user maintenance shall not be made by children without supervision.

Install units according to national wiring codes.

If the supply cord is damaged, it must be replaced by the manufacturer or its service agent or a similarly qualified

person in order to avoid a hazard.

An all-pole disconnection device which has at least 3mm clearances in all poles, and disconnection must be

incorporated in the fixed wiring in accordance with the wiring rules.

LENNOX will not assume responsibility for any personal injury or property loss caused

by improper installation, improper debugging, unnecessary repair or not following the instructions of this manual.

2 Product Introduction

LENNO Multi VRF System adopts inverter compressor technology. By changing the displacement

of compressor, stepless capacity regulation within range of 10%~100% can be realized. Various

product lineups are provided with capacity range from 8kW to 18kW, which can be widely used in

residential, commercial and working area and especially applicable to places with big load change.

LENNOX residential air conditioner is absolutely your best choice.

2.1 Names of Main Parts

Fig 2.1.1

VEC048N432U

VEC055N432U

VEC060N432U

DC Inverter Multi VRF System

No.

①②③④⑤

Name Motor Fan blade Electric box

assembly

Gas pipe valve Liquid pipe valve

Fig 2.1.2

No.

①②③④⑤

Name Motor Fan blade Electric box

assembly

Gas pipe valve Liquid pipe valve

2.2 Combinations of Indoor and Outdoor Units

(1) See below the number of indoor units that can be connected to the outdoor unit.

(2) The total capacity of indoor units should be within 50%~135% of that of the outdoor unit.

Model

Min sets of connectable IDUs

Max sets of connectable IDUs

VEC027N432U

VEC034N432U

VEC042N432U

VEC048N432U

VEC055N432U

VEC060N432U

(3) Can be connected to various indoor units. When any one of the indoor units receives

operating command, outdoor unit will start operation as per required capacity. When all

indoor units stop, outdoor unit will be shut off.

2.3 Operating Range

Cooling

Outdoor temperature: -5°C~48°C

3 Preparation before Installation

NOTE! Graphics here are only for reference. Please refer to actual products. Unspecified

dimensions are all in mm.

VEC027N432U

VEC034N432U

VEC042N432U

DC Inverter Multi VRF System

3.1 Standard Parts

Please use the supplied standard parts as required.

Parts for Outdoor Unit

No.

Name

Appearance

Qty

Remark

1 User Manual 1

2 Wiring (match with

resistance) 1

Must be connected to the

last IDU of communication

connection

3 Corrugated pipe 1

4 Chassis gluey plug 3

5 Drainage joint 1

6 Tube Connector

Sub-assy 1

VEC027N432U

VEC034N432U

VEC042N432U

3.2 Installation Site

Forbidden item! Improper operation might lead to personal injury or even death.

Item needs to be followed. Improper operation might lead to personal injury or property damage.

Select a location which is strong

enough to hold unit’s weight so

that unit can stand still and

erect.

The installation position should

withstand strong wind, typhoon

and earthquake. The unit must be

installed stably.

Please keep the unit away from

inflammable, explosive and

corrosive gas or waste gas.

Make sure the location has space

for heat exchange and

maintenance so that unit can

operate reliably with good

ventilation.

ODU and IDU should stay as

close as possible to shorten the

length of refrigerant pipe and

reduce bend angles.

Select a location which is out of

children’s reach. Keep the unit

away from children.

DC Inverter Multi VRF System

If the ODU is totally surrounded by walls, please refer to the following figures for space

dimension:

Fig 3.2.1

3.3 Piping Work Requirements

Refer to the table below for piping work requirements:

R410A Refrigerant System

Outer diameter (mm/inch) Wall thickness (mm)

Φ6.35(1/4)

≥0.8

Φ9.52(3/8)

≥0.8

Φ12.70(1/2)

≥0.8

Φ15.9(5/8)

≥1.0

Φ19.05(3/4)

≥1.0

4 Installation Instruction

NOTE! Graphics here are only for reference. Please refer to actual products. Unspecified

dimensions are all in mm.

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