BTS AC SYSTEM

7/29/2019 BTS AC SYSTEM

1/40

1


2/40

2

Split Air Conditioning System

Course Code: Split AC-01

Engineer M Rouf Khan


3/40

AIM

. SCOPE

. Safety Points

Introduction to HVAC

. International Standards

Designing Parameters

. System Design

General Points for Mobiserve Sites

Installation at Mobiserve Sites

Use of AC Tools

Working of Split AC

Precautions

Most Common Problems

Inspection & Maintenance

Contents

3


4/40

4

AIM

Provide Thermal Comfort

To Increase:

Technical Knowledge & Professional Skills,

To Reduce:

Human Errors at sites,Trouble shooting time,

Number of Repeated Alarms

Maintenance Cost.


5/40

5

SCOPE

Build a project team

aware to use method(s) & technique(s) to form a

CoolingSystem by locally available resources i.e.

materials & manufacturing techniques and be

able to run & maintain it.


6/40

6

Safety Points

Always follow instructions.

Keep the work area clean.

Keep flammable and combustible items away

from spark producing activities.

Know where the emergency stop buttons are positioned in the

workshop.

Always be patient, never rush in the working area.

Keep hands away from moving/rotating machinery.


7/40

7

H- Heating

V- Ventilation

AC- Air Conditioning

1. Room Temperature2. Humidity

3. Air Quality

4. Air Flow

Factors

Introduction to HVAC System


8/40

8

ASHRAE American Society of Heating,Refrigerating and Air-Conditioning

Engineers

National Fire Protection AssociationNFPA

International Standards


9/409

Room cooling requirements

Temperature and Humidity range

Placement of IDU & ODU

Space considerations

Effect on Equipment performance

Efficiency

Environmental Impact



10/4010


Heat Load Calculations:

Outside temp -5 C to +50 C

Room size 15 X 10

Heat due to opaque surfaces = 1866.2 W

Heat due to fenestration = 732 W

Internal Loads ( equipment ) = 2689.66 W

Total Load = 5.287 kW


11/4011


Heat Load = 5.287 kW

Cabin Relative Humidity = 40%

Evaporator Temperature = 4C

Refrigerant Used = R22

Refrigeration Cycle : Vapor Compression


12/4012

Result

Evaporator Pressure = 3 bar

Condenser Pressure = 12 bar

Heat Load = 5.287 KW

Condenser Cooling Load= 6.308 KW

Compressor Work = 1.02 KW

Mass Flow Rate = 1.94 l/min


13/4013

System Design


14/4014

System Design

OD unit

ID unit


15/4015

System Design


16/4016

System Design

Split Air Conditioner


17/4017

System Design

Split Air Conditioner


18/40

18


Zones

1-Inside Shelter

2- Outside Shelter

Thermostat


19/40

19


Coil

NC NO

27 Thermostat

Fuse

2

Amp 2

From A/C1 C.B From A/C2 C.B

L

F

A2 A2

24 Hrs Timer

A/C1 Contactor A/C2 Contactor

C 1

A1 A1

N

To A/C1 To A/C2

To control the time

of working for each

A/C and it consistsof:

24 Hrs timer + 2

contactors + fuse

base with fuse 2

Amp + thermostat

Time Control circuit


20/40

20

Central Station



21/40

21

Indoor Unit


Thermostat

Remote


22/40

Outdoor Unit

Condenser

Compressor


22


23/40

23

Thermostat

Indoor Items Outdoor Items

Indoor Bracket & Hole Outdoor Bracket

Pipe Connection Outdoor UnitPipe Connection Indoor Unit

Electric Connection Outdoor door Unit

Installation


24/40

Use of AC Tools

Swaging & Flaring Tool 2 way Valve for liquid

3 way Valve for Gas

Refrigerant 22

Mani Fold Valve Piping & Accessories

24


25/40

25

Thermostat



26/40

Working of Split AC

26


27/40

Routing of Cable.

Routing of Pipes.

Should be routed through areas oflow risk

Angle of pipe and cable hole should be proper

If Cables are installed less than 2.25m above the

floor should they normally be protected.

Precautions


28/40


Remote Control

Wall Thermostat

Dirty Air Filter

Coils Blockage

Capacitor

Fuses

Refrigerant Leakage


29/40


Thermostat

Remote

Air Filter


30/40


Capacitor

In case of LG system we

have a combine capacitor for

motor and fan

30

Compressor


31/40


Fuse on PCB Assembly

31


32/40


Out Door Unit

Flare Nut


33/40

Inspection and Maintenance

Leak check by Soapy water

33


34/40


Proper Purging of Air

34


35/40


Proper charging of gas through low pressure side

35


36/40


Indoor & Outdoor Unit

DAILY

WEEKLY

Monthly

inspections and issue a certificate after each inspection. It is

normal practice to be cleaned and checked on each monthly visit

so that the entire system has been properly maintained after the

fourth visit.


37/40


Proper cleaning of Condenser and Evaporator.

Keep the air filters clean

Keep the indoor evaporator & outdoor condensercoils clean

Every yearLubricate Indoor blower motor and outdoor unit fan

motor bearings.

Finally, a record should be kept of all maintenance and repairsmade to the system. It is always helpful to have a history of the

system.

37


38/40

38

Thank You


39/40

39

SURPRISE


40/40

40

Documents

BTS AC SYSTEM