Installing Window-Type Air-conditioning Units

COMPETENCY BASED LEARNING MATERIAL

Sector:
HEATING, VENTILATING, AIR-CONDITIONING AND REFRIGERATION (HVAC/R)
Qualification:

RAC Servicing NC II

Unit of Competency:

Installing Window-Type Air-Conditioning Units

Module Title:

Installing Window-Type Air-Conditioning Units

Technical Education and Skills Development Authority

East Service Road, South Superhighway, Taguig, Metro Manila

HOW TO USE THIS COMPETENCY-BASED LEARNING MATERIAL

Welcome to the module Install Window-Type Air-Conditioning Units. This module
contains training materials and activities for you to complete.

The unit of competency "Installing Window-Type Air-Conditioning Units" contains
knowledge, skills and attitudes required for RAC Servicing. It is one of the core modules
leading to National Certificate level II (NC II).

You are required to go through a series of learning activities to complete each learning
outcome of the module. In each learning outcome are Information Sheets and Instruction
Sheets (Reference Materials for further reading to help you better understand the required
activities). Follow these activities on your own and answer the self-check at the end of each
learning outcome. You may remove a blank answer sheet at the end of each module (or get
one from your facilitator/trainer) to write your answers for each self-check. If you have
questions, don’t hesitate to ask your facilitator/trainer for assistance.

Recognition of Prior Learning (RPL)

You may already have some or most of the knowledge and skills covered in this learner's
guide because you have:

 been working for some time
 already completed training in this area.

If you can demonstrate to your trainer that you are competent in a particular skill or skills,
talk to him/her about having them formally recognized so you don't have to do the same training
again. If you have a qualification or Certificate of Competency from previous trainings, show it to
your trainer. If the skills you acquired are still current and relevant to the units of competencies
they may become part of the evidence you can present for RPL. If you are not sure about the
currency of your skills, discuss this with your trainer.

At the end of this module is a Learner’s Diary. Use this diary to record important dates, jobs
undertaken and other workplace events that will assist you in providing further details to your
trainer or assessor. A Record of Achievement is also provided for your trainer to complete
once you complete the module.

This module was prepared to help you achieve the required competencies on Servicing and
Maintaining Window-Type Air-Conditioning/Domestic Refrigeration Units. This will be the source
of information for you to acquire knowledge and skills in this particular trade independently and
at your own pace, with minimum supervision or help from your instructor.

 Talk to your trainer and agree on how you will both organize the Training for this unit.
Read the module carefully. It is divided into sections, which cover all the skills and
knowledge you need to successfully complete this module.

 Work through all the information and complete the activities in each section. Read the
information sheets and complete the self-check. Suggested references are included to
supplement the materials provided in this module.

 Most probably, your trainer will also be your supervisor or manager. He/she is there to
support you and show you the correct way to do things.

 Your trainer will tell you about the important things you need to consider when you are
completing activities. It is important that you listen and take notes.

 You will be given plenty of opportunity to ask questions and practice on-the-job. Make
sure you practice your new skills during regular work shifts. This way, you will improve
both your speed and memory and also your confidence.

 Talk to more experienced workmates and ask for their guidance.

 Use the self-check questions at the end of each section to test your own progress.

 When you are ready, ask your trainer to watch you perform the activities outlined in this
module.

 As you work through the activities, ask for written feedback about your progress. Your
trainer keeps feedback/ pre-assessment reports for this reason. When you have
successfully completed each element, ask your trainer to mark on the reports that you
are ready for assessment.

 When you have completed this module (or several modules), and feel confident that you
have had sufficient practice, your trainer will arrange an appointment with registered
assessor to assess you. The results of your assessment will be recorded in your
competency Achievement Record.

Introduction:

Welcome to the Module on “Installing Window-Type Air-conditioning Units”. This
module covers portion of the required knowledge, skills and attitude of the unit of competency
“Installing Domestic Refrigeration and Air-Conditioning Units,” in a Domestic Refrigeration
and Air Conditioning Service Course NC II Course.

Summary of Learning Outcomes:

On completion of this module you should be able to:
LO1. Conduct Survey
LO2. Install electrical circuits
LO3. Install window-type air-conditioning unit
LO4. Conduct performance test

Assessment Criteria:

To be able to verify that you are competent enough in this module you must be able to
demonstrate the criteria listed below while conducting survey, installing electrical circuits and
installing window-type air-conditioning unit.

 Scope of work is determined based on work instructions
 Location for installation are identified based on work instructions
 Tools equipment needed are selected in line with job requirements
 Unit is inspected in accordance with the prescribed procedure
 Unit defects are reported as per prescribed procedure
 Electrical installation is checked for compliance with the latest edition of the

Philippine Electrical Code
 Electrical installation is tested and compared with the unit’s power requirement
 Dimensions for cavity is identified based on work instruction
 Layout is prepared before cutting the cavity in line with work instruction and

prescribed procedure
 Cutting of cavity is done in line with the prescribed procedure and work instruction
 Cavity sides are finished, leveled and plumbed in line with work instruction and

prescribed procedure
 Electrical materials, tools and equipment are prepared according to job requirements.
 Electrical components are rigidly installed in building structures.
 Installed electrical circuit is tested according to standard procedures.
 Electrical installation is done in accordance with the latest provision of PEC.
 Unit is mounted inside the cavity in accordance with the prescribed procedure
 Sealant is installed to ensure airtight seal around the unit in line with work instruction
 Installed unit is tested for operation in line with prescribed procedure
 Drainage system is installed based on work instruction
 Work documentation is prepared and submitted as per prescribed procedure
 Good housekeeping and safety practices is applied in line with job requirements

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Conditions:
The trainee must be provided with the following:

Equipment Tools

 Portable electric drill  Hacksaw
 Portable disc grinder  Push-pull rule
 Portable jig saw  Tri-square
 Welding equipment  Bar level
 Air-con unit  Cross-cut/ rip saw
 chisel
Supplies and Materials  Hammer
 Concrete cutting disc  Masonry tools( e.g. trowel), square,
 Masonry drill bit
 Hacksaw blade etc.
 Jig saw blade  Steel meter stick/Straight edge
 Masonry (cement, sand, etc.)  Pliers
 Marker/ pen, chalk  Diagonal cutting plier
 Bond paper  Flat screw driver
 Wall plugs  Philips screw driver
 Screws
 Expansion bolt Learning Materials
 Flat head screw, ¾ in X 10  Work plan
 *Fisher, # 6 (Tox)  Brochure
 Plastic molding ¾ in X 8 ft.  Catalogue
 Surface metal box (Amco Box)  Fundamentals of refrigeration
 Mica tube, ¼ in. dia.  Learning element in installation of
 Stranded wire, 2.0 mm2 TW window-type air-conditioning unit
 ACU outlet, 3 prong
 Safety switch, 30 A

Personal Protective Equipment
 Helmet /hardhat
 Goggles
 Gloves
 Gas Mask
 Working clothes/ jacket/apron
 Safety shoes

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Reference Materials:

 Althouse A. D., Turnquist C. H., Bracciano A. F.MODERN REFRIGERATION AND AIR
CONDITIONING. 1992. The Goodheart-Willcox Company, Inc.

 Institute of Integrated Electrical Engineers. PHILIPPINE ELECTRICAL CODE, Part 1,
2000 Edition. June 2002. Bookman Inc.

 Jones L., Morse O. SHEET METAL BASICS. 1983. Mid-America Vocational Curriculum
Consortium, Inc.

 CODE OF PRACTICE FOR REFRIGERATION AND AIR CONDITIONING (Philippine
Setting. June 2004. Department of Environment and Natural Resources (DENR)

Prerequisites:

To complete this module you must have the competency in using various tools, splicing
and joining electrical conductors and cement plastering. It is also required that you have the
competence in performing good housekeeping and safety practices. If you still lack these
competencies, meet with your trainer/facilitator to determine what method you will use to
gain the said skill. One option is to complete the information and practice activities in the
following modules:

 Performing Basic Masonry
 Performing Basic Electrical Works
 Performing Mensuration and Calculation
 Performing Good Housekeeping and Safety Practices

About this Competency Based Learning Material

Inside this Competency Based Learning Material are several “Learning Elements”.
Each Learning Element guides the learner to achieve one learning outcome.

In going through each Learning Element, you must follow the “Learning Activity Sheet”.
This Learning Activity Sheet will guide you through different “Instruction Sheets” that will
assist you in performing different learning activities towards the attainment of the learning
outcome.

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The instructions may be in the form of the following:

 Information Sheet - This will provide you with information (concepts,
principles and other relevant information)
needed in performing certain activities.

 Operation Sheet - This will guide you in performing single task,
operation or process in a job.

 Job Sheet - This is designed to guide you how to do job that
will contribute to the attainment of the learning
outcome.

 Assignment Sheet - The assignment sheet is a guide used to
enhance (follow-up) what you have learned in
the information sheet, operation sheet or job
sheet.

 Worksheet - Worksheets are the different forms that you
need to fill-up in certain activities that you
performed.

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Symbols

These symbols are located in the left margin of the module. It illustrates action which
should be taken or resources to be used at the particular stage in this module.

Learning Optional Activity
Outcome

Resources Practice

Reading Activity Self Check

Use Computer Answer Key

View Video Competency
Assessment
Listen to Audio
Tape Safety

Work Sheet

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Reading Activity 1 p 15

Read: Information Sheet 1: Operation of Window-type Air-
conditioning Unit

o This is an informative sheet that discusses the basic operation of a
window type air-conditioning unit

Self-Check 1 p19

Do: Self-Check 1

o This is to self-evaluate what you have learned about the basic operation
of window type air-conditioning unit

o After answering the questionnaire, you may check your answer with the
answer key located at the back part of this learning material

Reading Activity 2 p21

Read: Information Sheet 2: Selecting Area for Installation

o This is an informative sheet that discusses the most appropriate area and
suggested provisions in installing window-type air-conditioning unit.

Self-Check 2 p23

Do: Self-Check 2

o This is to self-evaluate what you have learned about the most appropriate
area where the window type-air conditioning unit will be installed.

o After answering the questionnaire, you may check your answer with the
answer key located at the back part of this learning material.

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Practice Activity 1 p25

Perform: Assignment Sheet 1: Determining the most common
location where window-type Air-
conditioning Units are usually
installed

o This activity aims to help you decide the best location for a window-type
air-conditioning unit to be installed.

o You will be seeking out the help of Refrigerator and Air-conditioning
Technician practitioner for this activity.

Practice Activity 2 p28

Perform: Assignment Sheet 2: Survey Area for Installation

o This activity aims to guide you in surveying the location for installation. It
will help you to identify where would be the exact position of the unit to be
installed and what materials, tools and equipment would you need for the
installation activity.

o You need the assistance of your trainer for this activity.

Reading Activity 3 p29

Read: Information Sheet 3: Pre-inspection of the Window-type
Air-conditioning Unit

o This is an informative sheet that discusses the important factors that
needs to be considered in performing the preliminary inspection of the
unit before installation. It also discusses the basic parts and accessories
included in one package, the physical defects of new and used window-
type air-conditioning unit and the compatibility of the unit with the power
source.

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Self-Check 3 p32

Do: Self-Check 3

o This is to self-evaluate what you have learned about the important factors
that needs to be considered in performing pre-inspection of window-type
air-conditioning

o After answering the questionnaire, you may check your answer with the
answer key located at the back part of this learning material

Practice Activity 3 p34

Perform: Job Sheet 1: Performing Pre-inspection of the
Window-type Air-conditioning Unit

o This is activity aims to guide you on how to inspect new and old window-
type air-conditioning unit before installation.

o Before you can do this activity, you need to know first how to use multi-
tester in measuring resistance and how to use ammeter in measuring
current. If you lack the skill, supplemental activities in using multi-tester in
measuring resistance and using ammeter in measuring current can be
found at pages 130-148

Practice Activity 4 p41

Perform: Assignment Sheet 3: Performing Pre-inspection of the
Window-type Air-conditioning Unit

o This is activity aims to enhance your knowledge and skill in performing
pre-inspection of new and old window-type air-conditioning unit to be
installed.

o You need Work Sheet 1: Checklist for Pre-inspection of Window-type
Air-conditioning Unit on page 43

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Practice Activity 5 p44

Perform: Job Sheet 2: Laying out cavity Dimension of an
Air conditioning Unit

o This activity aims to guide you in making a layout for the cavity.

Practice Activity 6 p50

Perform: Assignment Sheet 4: Laying out cavity of air

conditioning unit

o This activity aims to enhance your skill in making a layout for a cavity.

o You need the assistance of your trainer for this activity.

Practice Activity 7 p51

Perform: Job Sheet 3: Performing Cavity Works in
Concrete Surface

o This activity aims to guide you in making a cavity in concrete surfaces.

Practice Activity 8 p54

Perform: Job Sheet 4: Performing Cavity Works in
Wooden Surface

o This activity aims to guide you in making a cavity in wooden surfaces.

Practice Activity 9 p56

Perform: Job Sheet 5: Performing Cavity Works in
Window Sills

o This activity aims to guide you in making a cavity in window sills

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Reading Activity 4 p59

Read: Information Sheet 4: Mounting of components and fixtures
using wood screws and wall plugs

o This is an informative sheet that discuss how to mount components using
wall plugs and woodscrews on different type of building structures

Practice Activity 10 p67

Perform: Assignment Sheet 5 Mounting of components and fixtures
using wood screws and wall plugs

o This activity will guide you to mount components and fixtures using wood
screws and wall plugs

o Before you can do this activity, you need to know first how to use portable
hand drill. If you lack the skill, supplemental activities about using
portable hand drill can be found on pages 149-152

Reading Activity 5 p69

Read: Information Sheet 5: The Surface Non-Metallic Method
(Plastic Molding)

o This is an informative sheet that discusses the different types and sizes
of surface non-metallic raceway, specifically, the plastic molding.

Self-Check 4 p72

Do: Self-Check 4

o This is to self-evaluate what you have learned about different types of
plastic molding.

o After answering the questionnaire, you can check your answer with the
answer key located at the back part of this learning material.

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Reading Activity 6 p73

Read: Information Sheet 6: Overcurrent Protection

o This is an informative sheet that discusses the different types of
overcurrent current protection used in electrical installation.

Self-Check 5 p76

Do: Self-Check 5

o This is to self-evaluate what you have learned about overcurrent
protection.

o After answering the questionnaire, you can check your answer with the
answer key located at the back part of this learning material.

Reading Activity 7 p77

Read: Information Sheet 7: Load Center and Safety Switch
Enclosures

o This is an informative sheet that discusses the different types of safety
switch and circuit breaker enclosure. It deals with NEMA standard safety
switch and load center enclosures.

Self-Check 7 p81

Do: Self-Check 7

o This is to self-evaluate what you have learned about different types load
centers and safety switch enclosures.

o After answering the questionnaire, you can check your answer with the
answer key located at the back part of this learning material.

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Practice Activity 11 p82

Perform: Assignment Sheet 6: Identifying Load Center and Safety
Switch Enclosure

o This activity will help you to identify different type of enclosures used in
your area.

Reading Activity 8 p83

Read: Information Sheet 8: Electrical Conductors and Insulators

o This is an informative sheet that discusses about the different type of
conductors and insulators used in electrical installation.

Reading Activity 9 p85

Read: Information Sheet 9: Selecting Electrical Conductors for

Installation
o This is an informative sheet that discusses how to select appropriate type

and sizes of electrical conductors for installation.

Practice Activity 12 p91

Perform: Assignment Sheet 7: Selecting Conductors for Various

ampacities and Temperatures
o This activity will enable you to select appropriate type and size of

conductor with a given ampacities and temperatures.

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Practice Activity 13 p92

Perform: Assignment Sheet 8: Selecting Conductors for the Given
Horsepower Rating of Load

o This activity will enable you to select appropriate type and size of
conductor with a given ampacities and temperatures.

Practice Activity 14 p93

Perform: Job Sheet 6: Performing single outlet electrical
installation for window type air-
conditioning unit. (Surface Non-
metallic Raceway)

o This activity will enable you to perform electrical installation of single
outlet for window type air conditioning unit.

o In this activity, you will need the assistance of your trainer.

o Before you can do this activity, you need to know first how to use
voltmeter in measuring voltage. If you lack the skill, supplemental
activities about using voltmeter in measuring voltage can be found at
pages 153-155

Practice Activity 15 p101

Perform: Job Sheet 7: Installing Air-conditioning Unit

o This activity aims to guide you in installing air-conditioning unit

o You will need the assistance of your peer for this activity

o Before you can do this activity, you need to know first how to use
anemometer in measuring the airflow. If you lack the skill, supplemental
activities about using anemometer in measuring air flow can be found on
pages 141-143.

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Reading Activity 10 p107

Read: Information Sheet 10 Preparing Documentation

o This activity discusses the different type of job documentation that you
need to fill-up after installing window-type air conditioning system. You
will also be guided in the different parts of the job form that you need to
fill-up.

Practice Activity 16 p110

Perform: Assignment 8 Making Job Report

o This activity aims to enhance your knowledge and skills needed in
preparing job reports.

o You need work sheet 2 (worksheet for the assignment in preparing job
report) for this activity

Practice Activity 17 p112

Perform: Assignment 9 Installing Window-type Air-
conditioning Unit

o This activity aims to enhance your knowledge and skills needed in
preparing job reports.

o You need the assistance of your trainer or Refrigeration and air-
conditioning technician practitioner for this activity

o You need worksheet 3 (worksheet for the assignment in installing window
type air-conditioning unit) for this activity

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Prepare for Installation of Window-type Air-
conditioning Unit

Assessment Criteria:
The learning outcome stated above is attained if you can

demonstrate the following:
 Scope of work is determined based on work instructions
 Location for installation are identified based on work instructions
 Tools equipment needed are selected in line with job requirements
 Unit is inspected in accordance with the prescribed procedure
 Unit defects are reported as per prescribed procedure

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Information Sheet 1
Operation of Window-type Air-conditioning Unit

Air conditioning unit is a control system for temperature, humidity, air movement and air
cleaning in a confined space. The unit can control the temperature by absorbing the heat inside
the room. How does it happen?

First, to fully understand how window-type air-conditioning system works, we need to
learn the some thermal laws related to refrigeration and air-conditioning:

1. Fluids absorb heat while changing from a liquid state to a vapor state and give up heat in
changing from a vapor to liquid.

2. Heat flows only from a body which is at a higher temperature to a body which is at a
lower temperature (hot to cold)

These laws will help us fully understand the operation of the window-type air conditioning
system. Now we can start to discuss the operation of window-type air-conditioning.

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As we set the unit to fan mode, we are supplying power to the fan motor. The movement
of the fan motor will suck air from the air filter side blowing it out to the evaporator side
(compressor is still off therefore no movement on refrigerant line). This process circulates the
air from the room and filters it.

Warm filtered air
passing to the
evaporator side

then returning to
the room

The thermostat is a thermal sensor which can be set. Once the temperature of the
evaporator varies, and the setting of the thermostat becomes the same with the temperature, it
automatically turns off the compressor (provided that the compressor is running) then turns it on
again when the temperature becomes warmer.

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As we set the unit into cool mode, we are energizing the motor compressor. The

compressor will force the refrigerant to circulate through the system. The refrigerant will flow

from discharge line, passing through the condenser, to the metering device, then going to the

evaporator and returning to the suction line of the compressor. This completes the cycle. So

how is heat absorbed?

The refrigerant from the discharge line is a high pressure vapor. And we know that high

pressure vapor is directly proportional to temperature making the temperature in the condenser

hot. The air which had been suck by the condenser fan from outside of the room is a little bit

lower compared to the temperature of the condenser. This will now cool down the temperature

of the refrigerant in the condenser as stated in law number two (2); Heat flows only from a body

which is at a higher temperature to a body which is at a lower temperature (hot to cold). As the

condenser gives off heat to the surrounding medium, the refrigerant changes state from gas to

liquid but still it is high temperature high pressure liquid as stated in law number one (1); Fluids

absorb heat while changing from a liquid state to a vapor state and give up heat in changing

from a vapor to liquid.

The liquid will now pass through the metering device where pressure will drop through its

throttling effect. Again as we know, if the pressure decreases, temperature also decreases. As

a result the refrigerant absorbs heat (air coming from the room sucked by the evaporator fan)

from room. When the refrigerant absorbs heat, it boils and changes its state from liquid to vapor

as stated in law number (1); Fluids absorb heat while changing from a liquid state to a

vapor state and give up heat in changing from a vapor to liquid.

As low temperature low pressure vapor travels down the suction line it continues to

absorb heat turning it to superheated refrigerant. When the refrigerant enters the suction line

and passing to the compressor, it becomes more superheated. It continues to be superheated

until such time that it reaches the first coil of condenser. This cycle keeps on repeating until

desired temperature of the room is achieved.

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Self Check 1
Test what you have learned about the basic operation of
window-type air-conditioning

Direction: Read the questions carefully. Write the letter of best answer on the space provided.

1. What is the function of a metering device?

a. To heat the refrigerant going to c. To block the refrigerant going to the
the evaporator evaporator

b. To filter the refrigerant going to d. To reduce the flow of the refrigerant
the evaporator going to the evaporator

2. When will the air conditioning unit absorb heat?

a. When the refrigerant turns from c. When refrigerant turns from high
low pressure vapor to high pressure vapor to high pressure liquid
pressure vapor

b. When the refrigerant turns from d. When the refrigerant turns from high

low pressure liquid to low vapor pressure liquid to low pressure liquid

3. Why is blower needed in the evaporator side?

a. To allow air circulation inside c. To help air circulate inside the room
the room and help evaporator and cool down evaporator coil
coil absorb heat.

b. To cool down the evaporator d. To serve as air booster of the unit
coil

4. Why is blower needed in the condenser side?

a. To allow air circulation in the c. To help the condenser coil absorb heat
condenser side coming from the outside

b. To cool down the condenser d. To serve as air booster of the unit
coil and help in convert the high
pressure gas to high pressure
liquid

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5. On what part of the air conditioning system does superheated refrigerant build
up?

a. On the latter part of the c. In the early part of the evaporator
condenser

b. Inside the compressor d. From the latter part of the evaporator to
the early part of the condenser

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Information Sheet 2
Selecting an Area for Installation

In selecting an area for installation, the following should be avoided to prevent damage
or harmful effect to the unit:

 Greasy areas (e.g. areas near a machine)
 Salty areas (e.g. places/areas near the coast )
 Areas where sulfuric gas is present ( such as hot spring areas)
 Areas near flammable gas (e. g. LPG)

The following are general rules which needs to be considered in installing window-type
air-conditioning unit

a. It is important that the location selected where the unit will be placed suits the
customer’s needs.

b. Install the unit in an area with good ventilation. Any obstacles affecting the airflow near
the air inlet and the air outlet will cause blockage to the airflow

c. Install the unit away from heat or vapor.

d. Install the unit in an area away from television and audio units, cordless phones,
fluorescent lighting fixtures and other electrical appliances (at least 1 meter clearance).
This is to eliminate or reduce interference to other units generated by the motors running
from air-con.

e. Install the unit in an area that provides easy drainage for condensed water.

f. Install the unit in an area not exposed to the rain or direct sunlight. (Install a separate
sunblind if exposed to direct sunlight.)

g. Fix the unit firmly if it is mounted in a high place. See to it that the area would be able to
endure the vibration from the unit.

h. Install the unit where it will not cause neighbors to suffer hot wind and noise generated
by the unit.

i. Install the unit where power source conforms with the unit’s power requirements.

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The illustration below shows the general provisions in installing window-type air-
conditioning unit that may help us select the appropriate area for installation.

Side view

Top view

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Shelf Check 2
Test what you have learned about selecting area for
installation of window type air-conditioning unit

Direction: Read the questions carefully. Write the letter of the best answer on the space
provided.

1. What is the most important thing to consider in selecting an area for the
installation of window-type air-conditioning unit?

a. Select an area that allows good c. Select an area where source power
drainage for condensed water supply is nearest.

b. Select an area that is in high d. Select area based on the needs of
place. the client

2. To give better servicing space, the distance between the top parts of the unit
from the ceiling should be not less than _____________.

a. 10 cm c. 20 cm

b. 15 cm d. 25 cm

3. Why is there a need to have at least 15 cm open space at the sides of the unit
when installed?

a. To allow better air circulation for c. To have a better design for the
the unit. installation

b. To allow better servicing space d. To have tolerance in the installation
for the unit.

4. Why is there a need to fix the unit firmly when installed in high places?

a. So that it would not fall c. So that it would not vibrate
b. So that it would endure vibration d. None of the above

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5. Why should you avoid placing the unit’s backside away from your neighbors?

a. To allow better air circulation c. To allow better servicing space
d. To have better drainage
b. To prevent the unit from blowing
hot air on your neighbors

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Assignment Sheet 1
Determining the Most Common Location Where
Window-type Air-conditioning Units are Usually
Installed

After learning the things that needs to be considered in selecting the area for the
installation of window-type air-conditioning you are to perform another activity that will give you
idea what is the usual practice in installing window-type air-conditioning unit. Below are the
instructions that you need to follow.

1. Get permission from your trainer; inform him that you are going to conduct a
survey of installed window-type air-conditioning unit for him to give you necessary
assistance.

2. Conduct an interview with a refrigeration and air-conditioning technician
practitioner. Ask him the following questions.
a. How long have you been practicing this profession?

b. In installing window-type air-conditioning unit, where do you usually place the
unit? In the wall? In the window? Others? Why?

c. If given a choice, you were to install the unit in a wood surface, concrete
surface or window sills, where would you install the unit? Why?

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d. What is the usual elevation of the unit, 1 m above the ground? 1.5 m above the
ground? 2 m above the ground? Why?

e. Where do you usually place the back part of the unit? Do you allow restriction
to the airflow?

f. What do you do to eliminate condensed water from dripping and cause
disturbance to others?

3. After conducting the interview, look for a house which has an air-conditioning unit
installed. Observe the installation of the unit. Answer the following questions?
a. Where is the unit installed? Is it in the wall or in a window sill?

b. How high away is the base of the unit from the floor?

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c. Is there any restriction for airflow in the sides, and back part of the unit?

d. Does it have proper drainage system?

e. Is it installed in a way that it will disturb others?

f. Based on what you have learned from the factors that needs to be considered
in installing window type air-conditioning system, is the unit installed properly?
Support your answer?

4. Based on your interview and your observation give your idea what is the most
suited area for the unit to be installed in terms of location, type of surface where
the unit will be mounted, elevation, drainage and others.

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Assignment Sheet 2

Survey area for installation

On the past activities you have found out that a window-type air-conditioning unit can be
installed in the wall concrete or wood and in window sills. In every type of surface, different
preparations must be made that’s why in practice before the unit is installed, a survey at the
area is conducted. The purpose of this survey is to select the most appropriate location of the
unit to be installed, to identify the needed preparation to be done before installation and to
identify the needed materials, tools and equipment.

In this activity you will be doing a simulated survey and you will be selecting the most
appropriate location for installation and identifying the needed materials, tools and equipment.

Your tasks are:

1. Ask your trainer for the location of the room where he wants the unit to be
installed.

2. Survey the room and select for the most appropriate location of the unit to be
installed.

3. List down the needed materials, tools and equipment for this job.
4. After identifying the location, the needed materials, tools and equipment for this

job, let your trainer check your work.

You will be asked by your instructor, the reason for choosing that particular location for
installation, and why do you need the materials, tools and equipment that you listed. Good
Luck!

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Information Sheet 3

Pre- inspection of Window-type Air-conditioning Unit

Before installing the air-conditioning unit, preliminary inspections should be done to
ensure that the unit‘s parts are complete, its body is in good condition and the unit is in good
operational condition.

Basically, the air-conditioning unit package has the following parts:

a. air-conditioning unit

b. front panel

c. air-filter

d. housing

Brand new units have the basic components and some of the following:

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a. foam

b. brackets

c. screws

d. drain pan

e. remote control
For brand new units, you need to inspect whether the unit‘s parts are complete. You may
do this by comparing the actual parts by what is listed in the manual. You should check for paint
for scratches or *dents in the body and/or housing. If there are some defects found in the unit or
lacking of parts, it is important to inform your local distributor to avail warranty services. They
will be happy to help you because it’s part of their service.

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For used units, you need to check the base plate of the unit for defects or corrosion.
Defective or corroded base plate may cause misalignment of the mechanical parts of the air-
con (usually the fan blade) when installed and operated. It may also reduce the lifespan of the
unit if not remedied.

Corroded base plate

Lastly, you need to make sure that the unit is compatible to the power source. In the
Philippines, we have the standard power source is 220 volts 60 Hz AC. In case the unit‘s power
requirement is not the same as the power source, step-down transformer may be used.

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Self Check 3
Test what you have learned about pre-inspecting air-
conditioning unit before installation

Direction: Read the questions carefully. Write the letter of the best answer on the space
provided.

1. What are the basic parts of the air-conditioning unit that needs to be checked
before installation?

a. The unit, front panel, housing, c. The unit, front panel, housing and air-
air-filter and steel brackets filter

b. The unit, front panel, housing, d. The unit, front panel, housing, air-filter,
air-filter, steel brackets and steel brackets, screws foams, drain
screws pan and remote control

2. In inspecting used air-conditioning unit, you must check the base plate of the
unit for defects because it may cause __________.

a. continuous oxidation to the body c. restriction to the flow of liquid
of the unit condensate

b. misalignment, which may cause d. unattractiveness to the design of the
restriction to the movement of unit
fan blade.

3. When checking brand new units for physical defects you should look for
____________.

a. scratches c. both a and b

b. knocks d. None of the above

4. What will you do if a brand new air conditioning unit is found for defects?

a. Try to remedy it by your self so c. Disregard minor defects. Inform only
as not to trouble the dealer the dealer of major defects.

b. Inform the dealer to avail d. Contact qualified service personnel
warranty services and have your unit serviced.

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5. Why do you need to compare the power requirement of the unit with the power
source before installation?

a. To make necessary adjustment, c. To stop the work when the power
if needed source is not compatible with the unit’s

requirement

b. To make sure that the unit is d. None of the above
compatible with the power
source.

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Job Sheet 1
Performing pre-inspection of air-conditioning unit
to be installed

Objectives: At the end of this practice, the learner/trainee should be able to:

o Inspect the physical condition of the unit;
o Test the operational condition of the unit;
o Described the importance of performing pre-testing procedure

before installing the air-condition unit.
o Report result of inspections

Materials, Tools and Equipment:

Materials:

o Checklist for pre-inspection of the air-con - 1 pc

o Pencil or Pen and Paper - 1 set

o Unit’s Service Manual/Owners Manual* - 1 pc

Tools: - 1 pc
o Extension cord - 1 pc
o Universal Plug coupler/adapter*

Equipment - 1 unit
o Window-type Air-conditioning unit - 1 unit
o Multi-meter

* - Item is optional

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Procedure:
Inspection procedure for new window-type air-conditioning units
1. Unpack the unit from the box or container.

2. Check the air-con parts and accessories
included in the package. Use the user’s
manual as reference. Contact your dealer for
any missing parts or accessories.

3. Inspect the unit for noticeable physical
defects like dents and scratches. Report
them to your dealer, if there are any.

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Inspection procedure for used window-type air-conditioning units

1. Check the air-con parts and accessories
(cover and filter) which are supposedly
included in the package.

2. Inspect the base plate/pan and the housing
of the air-con. The base should be strong
enough to support the weight of the air-con
unit when installed. An indication of good
base plate is that the unit should not bend or
twist when one side is lifted.
The housing should also be in good
condition, enough to cover the components
of the air-con or it should not restrict any air
passage or drainage of the unit. If any
defects from the base and housing are
present, fix them first before installing the
units. (Refer to module in servicing and
maintaining window-type air-conditioning
unit.)

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Procedure in Testing Window-type Air-condition Unit

It is important to test the unit first before installing it on to the wall permanently. This
will help you ensure that the unit is in good condition. Doing so will also save you time,
energy and resources. Imagine yourself installing the unit without testing first and pulling it
out from the cavity because it is found defective. How would you feel?

Below are the steps in testing the unit:

1. Check the supply requirement of the unit.
The source line for the unit should be the
same or within the tolerable limit of the
supply requirement. In the Philippines, our
source line is 220 volts 60 Hz; before
using the unit for this supply, check if it is
for 220 volts 60 Hz also. In case the
source is greater than the required supply,
step-down transformers should be used to
reduce the source line.

2. Set the air-con unit on the floor or any flat
base. Make sure that the unit is flat or
else, the housing will be misaligned. This
may cause restriction to the movement of
blade when powered on.

3. Manually rotate the fan blade of the unit
while on the floor or flat base to make sure
that the blade would rotate smoothly.

4. Check the resistance of the unit by
connecting the test probe of the tester to
the two line terminals of the unit’s plug.

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a. When the air-con is off, high
resistance/infinite should be
measured.

b. When the air-con is switched on to fan
mode, resistance could be measured
but not to the point that the meter
would indicate zero resistance.

c. When the air-con is switched on to
low cool or in any setting where
compressor is expected to run, the
resistance of the unit would become
lower (almost zero Ohm to some
units). Theoretically the unit is still in
good condition because the
compressor is a high current device.
Its resistance in direct current signal is
very low. Therefore, it is advisable
that your source must be protected
(with fuse or circuit breaker) in case
the compressor is really defective.
This is to prevent further damage to
the unit and your electrical system.

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5. If you’re sure that the unit is not shorted,
switch the air-con off then plug it. Make
sure that the plug is suited to the
convenience outlet, if not; plug coupler can
be used temporarily.

6. Switch-on the unit into fan mode, Observe
if the fan blade would rotate smoothly.
Sluggish or screeching sound will be heard
on the unit if the blade movement is
restricted. If your unit is brand new,
contact your dealer for warranty services.
If your unit is not new, perform necessary
corrective actions (Refer to module in
servicing and maintaining window-type air-
conditioning unit).

7. Connect clamp tester on one line of the
service cord in order to measure the
current drawn by the unit both in fan mode
and cooling mode. Refer to nameplate
F.L.A. High amperage reading indicates
defective fan motor. Necessary corrective
action should be performed first before
installing the unit.

8. If the blade runs smoothly, wait for about 5
minutes then try switching the unit into low
cool. You will be hearing another sound,
which only indicates that the compressor
motor is now running. Measure again the
current then refer to nameplate F.L.A. High
amperage reading indicates defective
compressor motor. Necessary corrective
action should be performed first before
installing the unit.

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9. Feel the outlet of air for change in
temperature (from warm air to slightly cold
air). If there is a change in temperature,
the unit is working properly. If there is no
change at all and your unit is brand new,
contact your dealer to avail of the service
warranty, if your unit is not brand new, do
the necessary actions to rectify the defects
(Refer to module in troubleshooting
window-type air-condition unit).

10. If the unit is working properly, the unit can
now be switched-off and unplugged. It is
now ready to be installed.

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Assignment Sheet 3
Performing pre-inspection of air-conditioning unit
to be installed

After learning the procedure in inspecting a window-type air-conditioning unit, you will be
performing the activity on your own.

1. Inform your instructor when you are ready to inspect a window-type air-conditioning unit.
He will be assigning you an air-conditioning unit to check.

2. Check the unit based on the information that you have learned on the previous activity
and record your answer in the checklist in performing pre-inspection of window type air-
conditioning unit.

3. After completing the inspection let your instructor check your work.

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Perform Cavity Works

Assessment Criteria:

The learning outcome stated above is attained if you can
demonstrate the following:
 Dimensions for cavity is identified based on work instruction
 Layout is prepared before cutting the cavity in line with work

instruction and prescribed procedure
 Cutting of cavity is done in line with the prescribed procedure and

work instruction
 Cavity sides are finished, leveled and plumbed in line with work

instruction and prescribed procedure
 Good housekeeping and safety practices is applied in line with job

requirements

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Checklist for Pre-inspection of Window-type Air-conditioning Unit

NO STATUS Tick on the box if Recommendation
the status of the unit

being checked
YES NO N/A

Parts and accessories are complete as

1 stated in the service manual (for brand new
air-condition unit)

Basic parts are complete (for used air-
2 condition units)

Housing and base plate has no physical
3 defects

Supply requirement of the unit is the same
4 as the power source

5 Resistance of the unit is theoretically okay

Power plug of the unit is suited with the
6 convenient outlet

7 The unit operates smoothly in fan mode
8 The unit operates smoothly in cool mode

If there is a NO answer in the status, recommendations or remedy should be provided so
that corrective actions could be done before installing the unit to the cavity. This is to ensure
that your effort and time will not be wasted when the unit is found out to be defective after being
installed.

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55 Job Sheet 2
Objectives:
Laying Out Cavity Dimension of an Air conditioning
unit

At the end of this practice the learner/trainee should be able to:

o Get the dimension of the air-conditioning unit
o Select appropriate location for the air-conditioning unit to be

installed.
o Layout mounting location of the air-conditioning unit based on

working drawing

Materials, Tools and Equipment:

Materials: - 1 pc
- 1 pc
o Pencil or Pen and Marker - 1 pc

o Installation plan or working drawing
o Unit’s Specification Manual*

Tools: - 1 pc
o Pull-push rule or any measuring device suited for 1 pc

the activity
o Spirit level Bar

Equipment - 1 unit
o Window-type Air-conditioning unit

Personal Protective Equipment - 1 pc
o Gloves

* - Item is optional

Procedure:

Laying out or marking the location of air-con to be installed is the process of
transferring the data from the installation plan or working drawing into the wall where the unit
will be installed. The purpose of this is to eliminate the risk of committing error while cutting
through the wall.

If you already have a working drawing with complete specification (measurements,
sizes and locations in the floor plan) there is no need to measure the dimension of the air-
conditioning unit and find a suitable location (wall location and positioning). All you have to
do is set the reference line where all the measurement will start then draw the line which will
form the layout.

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If there is no working plan, we can start with step no 1 but if working plan is
available proceed to step no. 3.
1. Get the dimension of the air-condition unit

to be installed.
a. Measure the height of the unit.

b. Measure the width of the unit.

2. Select the appropriate location and position
for the air-condition unit (refer to
information sheet about selecting an area
for installation).

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3. Read your working plan and take note of
the following data:

Data Measurement in
centimeters (cm)

o Elevation of the

unit:

o Distance of the

unit away from

the adjacent

wall:

o Height of the

unit:

o Width of the

unit

Note: In measuring, consider the tolerance

between the cavity and the housing. For

concrete, at least 5.5 cm for finishing plaster, 3

mm for other surfaces.

4. Measure the elevation of the cavity. Mark
this as point A.

5. Measure the distance of the cavity from the
adjacent wall.

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6. From point A, draw the base line of the
cavity. Use a bar level to ensure levelness
of the base to the ground. Make sure that
the bubble in the level is at the center of
the tube.

Bubble must be at the
center of the tube

7. Place the level bar across the base line.
Again, make sure that the bubble in the
level is at the center of the tube to ensure
perpendicularity of this line with the base
line. Draw a vertical line.

Bubble must be at the center
of the tube

8. Finalize the base line by measuring the
required width of the cavity along this line
and marking it (consider the mark as end
of the line).

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