Installing Window-Type Air-conditioning Units

12. Lay-out the conductors carefully
especially in angle turns; be careful
not to put too much stress on the
conductors bend so that the insulation
will not be damage.

13. Cover the molding; snap it by hitting
the capping slightly against the
backing. Be careful not to break the
capping.

14. Install the cover of surface device box.

15. Secure the cover by tightening the two
screws located at the two sides of the
cover.

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16. Terminate the conductors on the
three-prong ACU outlet.

17. Install the 3-prong convenience outlet.
Make sure that the conductors are
terminated properly. Be careful not to
interchange the connection of three
wires, the green screw is intended for
grounding conductor (green wire).

18. Fix the metal strap of the outlet to the
metal box.

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19. Install the plate cover of the
convenience outlet.

20. Connect the wires to the safety switch.

Harness the conductors properly

inside the box to reduce stress on the
conductor’s insulation.

Note: Be careful not to break
conductor’s insulation during

harnessing. If the insulation has

been damaged due to

unavoidable circumstance,

cover it with vinyl tape.

21. Switch on the safety switch and check
the voltage in the convenience
receptacle.

22. This is how your work should look like.

23. Have your instructor check your work.

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Install Air-conditioning Unit

Assessment Criteria:

The learning outcome stated above is attained if you can
demonstrate the following:
 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

requirement

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Objectives: Job Sheet 7

Install Window-type Air-conditioning Unit

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

o Mount the window-type air-conditioning unit
o Test window-type air-conditioning unit for operation
o Provide drainage for the window-type air-conditioning

system
o Demonstrate safety practices while working

Materials, Tools and Equipment:

Materials: - 1 pc
o Installation plan or working drawing - 10 pcs
o Unit’s Manual
o Fastener (wood screw, metal screw, self - 4 pcs
- 10 pcs
threading screw, bolt and nut, concrete

nail, etc)
o Expansion bolt
o Fisher (wall plug)

Tools: - 1 Set
o Screw driver - 1 set
o Drill bit for concrete, wood or metal - 1 pc
o File - 1 set
o Screw driver - 1 set
o Wrench*
o Pliers 1 pc
o Ball peen hammer - 1 pc

Equipment - 1 unit
o Window-type Air-conditioning unit - 1 set
o Multi-meter
o Portable Drill

* - Item is optional

Procedure:

Mounting housing of air-conditioning unit is a simple task. It involves simple metal
works and some alignments. Some of the important things to consider are:

a. The housing must be securely mounted to the cavity.
b. The housing should be tilted towards the drainage, so that the **condensate in the

base plate will freely flow towards the drainage.
c. Steel brackets/frame must be used if the wall cannot support the weight of the air-

conditioning unit to be installed.
d. Electrical source should be compatible with the unit

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1. Install steel brackets. Make sure that the
bracket is slightly, tilted towards the direction
of the drainage to allow condensate to drain.

2. Mark the locations of the holes to be drilled.
You can use the housing as reference.
Consider the thickness of the front cover
before marking. The cover has locks/screws
connected to the housing. If the housing is
mounted inside the cavity, the cover may
never be mounted to the housing. Therefore,
the housing should be mounted with at least
12 mm (or as stated in the air-con manual)
extension away from the surface of the wall.
Consider also the gaps between the wall and
the housing it should be not less than 3 mm
or as stated in the user’s manual.

3. Drill holes in the base part of the cavity
or/and in the bracket where the housing will
be screwed on.
Note: If the base part of the cavity is wood,
the hole must be smaller than the screw. If
the base part of the cavity is steel or
concrete, the hole must be slightly bigger
than the bolt to be used in securing the
housing to the wall.

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4. Place the housing inside the cavity

5. Screw the housing to the edge of the cavity
and bracket.
Note: If the base of the cavity is concrete,
you can use fisher (wall plug) to ensure
secure contact between the wall and the
housing when screwed.

6. Slide the unit into the housing until it is firmly
against the rear of the housing. Care is
required to ensure the foam sealing strips on
the housing remain in position. Ask help for
this step. DO NOT ATTEMPT TO LIFT THE
UNIT ALONE!

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7. Check the power source if it is compatible
with the unit. Do corrective action in case the
power is not suited for the unit.

8. Connect the air conditioner in the power. Coil
excess cord beneath the air conditioner base
or convenient outlet.

9. Engage chassis lock into the bottom of the
housing rail and secure to the base with the
screw provided (this step is optional).

10. Switch the unit into fan mode. Check if there
is a vibration in the installation. Check also if
the fan blade is rotating smoothly. If this
happens, pull out the unit again then re-insert
it until proper alignment (no vibration and fan
blade is rotating smoothly) is achieved.

11. Turn off the unit then fit the front panel to the
unit and make sure that it is securely
mounted (see unit’s manual).

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12. Fit the drain chute to the housing and run a
drain line to a suitable location if required.

13. Seal gaps between housing and casing by
using rubber, foam, plastic, silicone. This is
to ensure that the unit is air-tight.

14. Turn the unit into fan mode for at least three
(3) minutes then switch to cool mode. Get
the temperature and refer to the unit’s
manual if the condition of your unit is okay.
Corrective action should be done if the unit is
found to be defective (refer to module in
troubleshooting window-type air-conditioning
and domestic refrigeration system)

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Information Sheet 10

Preparing Job Documentation

In the previous activities, you have learned the technical aspects in installing window-type
air-conditioning unit, now you will be learning the administrative side of it.

The documentation process in a company may vary from one form to another. The most
common is the Service Report or sometimes called Job Order Form.

The Service Report describes the work done in a process and the resources used. These
forms helps in assessing the cost (charge) of the service rendered. It will also serve as the
record for the servicing company, which can be used as reference for future servicing job with
the same client. Service record can also be used as cross reference in requesting materials,
tools and equipment.

Every Service Report has an issue number or control number assigned to it. This is to
identify the work done. This control number will be the reference to all documentation done
related to the job like requisition of supplies, materials, tools and equipment.

Parts of a Service Report
Customer’s Data

In this part you are to fill-up the name of the customer, the contact number, the address
and the date you finished the service.

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Job Done
In this part of the service record, you tick on the type of service you rendered that

costumer.

Parts and Consumables
This part of the service record is where you tick on the parts and consumables you

requested in the company which is used in the job. The cost of the said parts or consumables
will be added to the service fee as the total cost of service.

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Readings
This part of the service record indicates the reading of the low side and high side

refrigeration system after repairing the unit.

Authentication
This part of the service record indicates the authenticity of the document. You as

servicing need to sign this part as proof that you rendered the service stated at the Job Done
Section, indicating also your certification number to prove that you are qualified. In the other
hand, the owner or customer needs also to sign his name as a proof that he receives the
service you rendered. A control number is added to this part which serves as reference to every
document you have done

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Assignment 8

Making Job Report

After reading the importance of making a job report and identifying the different parts of a
job report, your task now is to practice filling up a service report.

1. Secure a copy of Worksheet 2: Service Report
2. Fill up the service record based on the scenario below. Your certification number is your

I.D. Number.
3. Let your trainer sign as your customer for the said job. Then let him check your work.

Scenario:
You have installed a used window-type air-conditioning unit in a class room. The unit

was installed at the window sill in the back part of the room.
In the process of installing the unit, you have used hoses, sealant (foam), metal screws

(8 pcs) and steel brackets. The sealant was provided by the owner. The rest of the materials
were provided by your company.

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Worksheet for Assignment in Installing
Window-type Air-conditioning Unit

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Assignment 9

Install Window-type Air-conditioning Unit

After going through several activities in installing window-type air-conditioning unit your
task now is to look for an on the job training where in you will be able to enhance the skills that
you learned from this module.

1. Get permission from your trainer; inform him that you want to enhance your skill in
installing window-type air-conditioning unit. He may be able to refer you into a
Refrigeration and Air-conditioning service shop where in you can practice installing
window-type air-conditioning unit in a concrete surface, wooden surface and window sills
or he may provide you with the job himself.

2. In every installation you have done in the shop where you are practicing, fill-up an
assignment report (worksheet 3) sign it and let your immediate supervisor sign it.

3. After experiencing installing window-type air-conditioning unit in different locations
(preferably, concrete surface, wooden surface and window sills) Return to your instructor
and submit a copy of the assignment reports signed by you and your immediate
supervisor.

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Worksheet for Assignment in Installing
Window-type Air-conditioning Unit

Name of Customer:

Address of Customer

Contact Number of Installation of window-type air-conditioning unit
Customer:

Service Rendered:

Service Report No.

Location: ( ) Wooden surface ( ) Concrete Surface

( ) Window Sills

Installed by: Signature
(Trainee’s Name and

Signature)

Inspected by: Signature
(Supervisor’s Name

and Signature)

Date started Date finished:

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Competency
Assessment

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Evidence Plan

Before you can take the assessment, take your time to study the evidence plan. An
evidence plan describes the ways of gathering evidence to prove that you are competent
enough in this module. Below are definitions of terms which will help you understand what is
contained in the plan.

 Critical aspect of competency means that you should have a passing rate for that
particular criterion in order to pass the assessment.

 Interview is an assessment method which is a form of questioning orally or in written
form.

 Demonstration with questioning is an assessment method wherein you will prepare a
scenario where in you will demonstrate the skills that you have learned from this
module while you are being interviewed to confirm that you also learned the required
knowledge and attitude

 Observation and questioning is an assessment method wherein you will be observed by
your instructor while you are actually doing your job in the work site.

 Presentation of final product is an assessment method wherein you will be asked to
show your installation output for evaluation. This supplement the result of your
performance assessment.

 Third party report Is an assessment method wherein your direct supervisor, previous
clients will be asked to rate your performance. This supplement the result of your
performance assessment.

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The table below is the plan which includes criteria (rightmost column) and assessment
methods (interview, demonstration with questioning, and observation with questioning
Presentation of final product and third party report). Any of the five assessment method can be
used to gather evidence in a particular criterion. Study them carefully and solicit clarification
from your instructor if needed. When you are ready, make a schedule for assessment with your
instructor.

Ways in which evidence will be collected :
( tick the column )
Interview
Demonstration with
Questioning
Observation with
Questioning
Presentation of Final
Product
Third Party Report
The evidence must show that the candidate can ….
Select locations for installation based on client and unit’s
requirement

Check condition of air conditioning unit to be installed

Prepare cavity of the unit to be installed in line with job
requirements

*Select wires and electrical devices in accordance with
manufacturer’s requirement

*Install electrical circuits based on work plan and prescribed
procedure

*Install air conditioning unit based on manufacturer’s
requirement and prescribed procedure

Install drainage system for condensate based on work plan

*Check installed unit for operation in accordance with
prescribed procedure

Perform housekeeping based on work requirement

Communicate effectively with others if needed in order to
ensure safe and effective work operation

*Incorporate safety practices in line with work requirements

Utilize tools based on work requirements

Items with * is/are critical aspects of competency

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Optional Activities

Optional Activities

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Optional Activities

Reading Meter Scale

Reading meters scale is like analyzing decimal numbers. From one whole, the
linearity of the scale can be divided into several graduations. This graduation can be called
main scale graduation. Each main scale graduation can be divided into several sub-scale
graduations. To generalize the meter scale is made of several main scale graduations and
sub-graduations.

Main scale Sub-scale
graduation division

Scale intended
for ohm meter

Scale intended
for voltmeter AC
or DC and DC

milli-ammeter

To better understand this, let’s look at the illustration below. Line A has two main
graduations (0 and 10). Zero is the lower main graduation and 10 is the higher main
graduation. Within these two graduations is a sub-graduation. What could be the value of
that sub-graduation?

Graduation Graduation
for 10 for 0

Line A

Imagine ten kids, divided into two groups. How many kids belong to each group?

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Optional Activities

Group 1 Group 2

Similar with the problem above, we divide 0-10 into to two (2) graduations. Between 0
and 10 is 5, therefore the value of the sub-graduation between 0 and 10 is 5. This means
that each graduation away from zero has the value of 5. So we can count the graduation as
0, 5, 10.

10, 5, 0

2nd 1st
division division

In mathematical expression we can do it this way:

Given:

Value per sub-graduation = (Higher scale graduation – lower scale graduation)
Number of sub-graduation

Higher scale graduation = 10
Lower scale graduation = 0
Number of sub-graduation = 2 (derived by counting the number of graduations from the

lower scale graduation to the higher scale graduations)

Value of the sub-graduation = (10-0) + 0
2

Value of the sub-graduation = 5

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Optional Activities
To enhance our skill in reading meter scale, we added sub-graduations on the same
scale. What would be the value of each sub graduation from 0 to 5? from 5 to 10?

The value of this
graduation is 5

We know from our activity earlier that the center graduation has the value of 5. We
can also see that there are five sub-graduations from the area of 0 to 5. This means that the
value 5 is divided into 5 graduations, making the value of each sub-graduation 1. How did it
happen?

Imagine five (5) apples to be distributed to five (5) kids. How many apples will each
kid have if we distribute the apples equally for 5 kids? Each kid will have five apples.

In mathematical expression we can do it this way:

Given:

Value per sub-graduation = (Higher scale graduation – lower scale graduation)
Number of sub-graduation

Higher scale graduation = 5
Lower scale graduation = 0
Number of sub-graduation = 5 (derived by counting the number of graduations from the

lower scale graduation to the higher scale graduations)

Value per sub-graduation = (5-0)
5

Value per sub-graduation = 1

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Optional Activities

The sub-graduation between 5 and 10 is 2.5 greater than 5 and 2.5 less than 10. How
does this happen?

We can always assume that the value of any sub graduation between 5 and 10 is
always greater than 5 and less than 10. The difference between 5 and 10 is 5. If we divide 5
into two parts then we will have the value of 2.5. Therefore, based on the illustration, every
graduation from 5 is 2.5 making the value of the sub-graduation 7.5.

10, 7.5, 5

In mathematical expression we can do it this way:

Given:

Value per sub-graduation = (Higher scale graduation – lower scale graduation)
Number of sub-graduation

Higher scale graduation = 10
Lower scale graduation = 5
Number of sub-graduation = 2 (derived by counting the number of graduations from the

lower scale graduation to the higher scale graduations)

Value per sub-graduation = (10-5)
2

Value per sub-graduation = 2.5

To summarize what we have learned, we know that each meter scale is composed of
several graduations. The value of each graduation depends on the number of division of
each meter scale.

Knowing how to compute for the value of each graduation will help us interpret the
message being displayed by any meter. All we have to do is take note on the scale
graduation where the pointer is pointing then compute for its value.

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Optional Activities

Reading Meter Scale

Objectives: At the end of this practice the learner/trainee will be able to:
o Identify the different meter scales in a multi-tester
o Compute for the value of each scale graduation
o Read meter scale

Materials Tools and Equipment:

Equipment - 1 set
o Analog Multi-Tester

* - Item is optional

Introduction:

Analog measuring instruments convert electrical energy into mechanical movement of a
particular device which will enable user to interpret the implication of that energy by using meter
scale.

In multi-meter, the electrical energy will drive a pointer that will point a particular value in
the graduation scale of the meter. This will now be converted into a numerical value.

Procedure:
Let us Use the meter below:

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Optional Activities

1. Take note of 30, since the pointer deflects between 30 and 50. We know that the reading
is not less than 30 but not greater than 50. We also know that the pointer points two sub-
graduations more from 30.

2. Count the number of sub-divisions within the main division of 30 and 50. In the example
we have 10 divisions.

3. Compute for the value of each sub-graduation.

Given:

Value per sub-graduation = (Higher scale graduation – lower scale graduation)
Number of sub-graduation

Higher scale graduation = 50
Lower scale graduation = 30
Number of sub-graduation = 10 (derived by counting the number of graduations from

the lower scale graduation to the higher scale
graduations)

Value per sub-graduation = (50-30)
10

Value per sub-graduation = 2

4. Get the value of the sub-graduation the pointer is pointing on by multiplying excess sub-
graduation with value per division.

Given:

Value of sub-graduation the pointer is pointing on = (excess sub-graduation x value/sub-graduation) + lower
scale graduation

Value of sub-graduation the pointer is pointing on = (2 X 2) + 30

Value of sub-graduation the pointer is pointing on = 34 (this now
becomes the actual
reading)

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Optional Activities

Using Analog Ohm Meter

Objectives: At the end of this practice the learner/trainee will be able to:
o Identify do’s and don’ts in using ohm meter

o Calibrate multi-tester for resistance reading

o Measure resistance in a circuit

Materials Tools and Equipment:

Equipment - 1 set
o Analog Multi-Tester

* - Item is optional

Introduction:

After learning the different parts and function of the multi-tester and how an ohmmeter
works, you will now practice how to use the ohm meter.

Precautions in using ohm meter

1. Since the power source in the circuit
comes from the internal battery of the
multi-tester, make sure that there is
no other power source connected
to the load that is being measured.
Failure to do so may damage the ohm
meter.

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Optional Activities

2. To ensure accurate measurement, the
pointer is checked for correctness
(pointer is pointing at zero of voltage
scale when not in use) and adjusted if
necessary.

When pointer is not in
zero position (the

reference is voltage
scale) adjust zero

corrector

3. Do not hold the metallic tip of the
multi-meter’s test probe to avoid

electrocution or false resistance

reading

4. Every time the range selector of the
ohm meter is changed, pointer is
calibrated to zero by shorting the two
test probe and adjusting the zero ohm
adjusting knob. This is again to
ensure accurate reading.

Adjust zero ohm
adjusting knob
until the pointer
points to zero

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Optional Activities

5. Make sure that the battery of the Pointer does not
meter is fully charged. A good reach zero ohm
indication of drained battery is that, due to drained
when you short the test probe of the
multi-tester in ohm meter setting, the battery
pointer does not reach zero (0) even
though zero ohm adjusting knob is
adjusted to the fullest. Failure to do so
may result false reading.

6. Some electronic device to be tested,
are polarity sensitive. Japanese
standard analog ohm meter emits
negative signal at the red probe.
Digital ohm meter emits negative
signal at the black probe.

7. The ohm meter can only read
resistance and tolerate external
electrical signal within its design
specification. Failure to observe this
may result to false reading or damage
to the unit. Refer to the unit’s manual
for more information.

8. In measuring unknown resistance,
range selector is set to lowest setting.
If the pointer does not deflect at all or
deflects within the scale of 2k – 200,
set the range selector to the next
higher range. Repeat adjusting the
range selector until such time that the
pointer rest from 0 to 200 or the range
setting is the highest for the tester. In
case the pointer does not deflect, the
unit/device’s resistance is greater than
what the multi-tester can measure.
You can now declare the reading
infinite.

9. Shorted means the circuit/device
being measured has no enough
resistance to carry the supply voltage.
It can be measured only at X10 ohm
range and the pointer deflects to zero
Ω (Rightmost portion of the meter
scale).

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Optional Activities

10. Infinite, represented by symbol ∞,

means the circuit/device being
measured is open (no connection or
no continuity) when the ohm meter is
at the highest range (e.g. X 100 k).
This can be identified by the pointer
not deflecting.

Procedure:
1. Make sure that the circuit there is no
electrical signal flowing in the circuit.
This can be done by unplugging the unit
or device to be measured from the
source of supply.

2. Set the multi-tester to appropriate
resistance range (for unknown
resistance, range selector is set to
lowest setting for better measurement)

3. Adjust zero oh corrector if necessary.
This is done when the two test probes
are shorted together and the pointer
does not rest to zero.

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Optional Activities

4. Short the two test probes, then calibrate
the tester by adjust the zero ohm
adjusting knob until such time that the
pointer points to zero (0). This step is
done every time the range setting in
the ohm meter is changed.

5. Connect the probe of the multi-tester in
parallel with the load. Make sure that
you do not hold the metallic tip of the
meters test probe or else it may register
false reading.

6. Take note of the meter reading.

7. Final result (resistance of the load) can be taken by multiply the meter reading with
the range selection.
Example:
Range selector is set to x10 Ω and the meter reading is 22 then

Resistance =Meter reading x Range selection
Resistance = 22 x 10 Ω
Resistance = 220 Ω

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Optional Activities

Using Digital Clamp Ammeter

Clamp ammeter is a measuring instrument used to measure Alternating Current.
This operates though the principle of magnetic field.

When the instrument is clamped in one of the conductor in a power line, it generates
current reading. How does it happen?

We know that the magnetic field is directly proportional to current, when the current
passing through a conductor increases so is the magnetic field. This magnetic field is
sensed by the clamp and converted into electrical energy. This electrical energy will be
amplified to be able to drive a meter coil for analog tester or be sampled in the analog to
digital converter to become digital information then displayed into a Liquid Crystal Diode
(LCD). See figure 1 and 2 for illustration.

Figure 1. Simple representation of analog clamp ammeter operation

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Optional Activities
Figure 2. Simple representation of digital clamp ammeter operation

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Optional Activities
Parts of a Digital Clamp Ammeter

Clamp ammeter is similar to multi-tester. It also have AC volt meters, ohm meter and
AC ammeter.

1

2

3 4
5
8
7 6

1. Current Sensing Clamp 2. Range Selector
3. Range Selection 4. Test Probe
5. Voltage Terminal (Jack) 6. Common Terminal (Jack)
7. Ohm meter Terminal (Jack) 8. LCD Display

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Optional Activities

Objectives: Using Digital Clamp Ammeter

At the end of this practice the learner/trainee will be able to:
o Measure current in a circuit
o Apply safety practices in using ammeter

Materials Tools and Equipment:

Equipment - 1 unit
o Digital Clamp Ammeter

* - Item is optional

Introduction:

Clamp ammeter is an Alternating Current measuring instrument. It is commonly used in
measuring currents flowing through motors. Since refrigerators and air-conditioning operates
using motors, it is important for us to learn how to use this.

Procedure in Measuring Alternating Current

1. Power on the clamp ammeter and the
unit to be measured.

2. Clamp the meter into one of the power
line of the unit to be measured. Do not
split the cord of the unit to be
measured. Use service cord (a form of
extension cord where in the two wires of
the cable are split) for this activity.

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Optional Activities

3. Release the clamp then read the result
from the display. In places where it’s
hard to read from the display, activate
data lock to store reading in the display.
After storing the data, you can now
remove the ammeter then read the
display.

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Optional Activities

Objectives: Using Portable Drill

At the end of this practice the learner/trainee will be able to:
o Set a portable drill
o Select appropriate drill bit for the job
o Drill holes into the wall using portable drill

Materials Tools and Equipment:

Equipment - 1 unit
o Portable Drill - 1 set
o Drill bit

* - Item is optional

Introduction:

Drilling is the process of making a hole using spiral cutting tool called drill bit. Drill bits
have different sizes for different applications like concrete, metal and wood. Below are the
steps and precautions in using portable drill.

Procedure:

1. Select portable drill with enough power
rating to perform the task to be
undertaken.

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Optional Activities

2. Some portable drill have accessory
handle. Loosen the handle so that you
could fit it in the portable drill.

3. After inserting the accessory handle,
position in a way that it would help you
hold the portable drill easier then tighten
it.

4. Select appropriate drill bit for the job.
a. Bit for concrete

b. Bit for metal

c. Bit for wood

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Optional Activities

5. . Insert the bit into the drill’s chuck then
tighten it

6. Some portable drill have stopper. You can
use this to control the depth of the hole to
be drilled.

7. Position the tip of the bit to the mark
where hole will be drilled.
Note: some surface requires

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Optional Activities

8. Hold proper stance in drilling, this will help
you control the depth of the hole to be
drilled. It is also important to apply
enough force in drilling to avoid breaking
the drill bit.

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Optional Activities

Objectives: Using AC Voltmeter

At the end of this practice the learner/trainee will be able to:
o Identify do’s and don’ts in using ohm meter
o Measure voltage in a circuit

Materials Tools and Equipment:

Equipment - 1 set
o Analog Multi-Tester

* - Item is optional

Introduction:

Voltmeter is an instrument used to measure supply voltage in a power source. The
multi-tester can measure both Alternating Current Voltage and Direct Current Voltage.

Since most of our activities are for AC
voltage measurement, we will be focusing our
discussion in AC source.

The AC voltmeter works by taking the
potential difference between line 1 and line 2 of the
voltage source. A resistor is connected in series
with the coil of the meter to limit the voltage of the
signal flowing into it. This signal will now be
converted into mechanical movement which
displays the voltage reading.

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Optional Activities

Precaution in using Voltmeter

1. In measuring voltage in a circuit, make sure that the circuit has power on it.

2. In measuring unknown voltage, set the range of the voltmeter to the highest range
setting or else damage on the meter may occur to the unit in case the source is
higher than the set range.

3. In measuring known voltage, set the voltmeter range a little bit higher than the
voltage source for accurate measurement.

4. Do not touch the metallic part of the multi-tester’s test probe or bared metal part of
the terminal being tested while measuring voltage to avoid electrocution.

5. Avoid making the tip of the two test probe contact while measuring voltage.

6. The meter reading will not exceed the selected voltage range (e.g. if the selected
voltage range is 250 volts AC, the highest reading on the display will not exceed 250
volts)

Procedure:

We can measure voltage by following the steps below:

1. Set the appropriate voltmeter range (little
bit higher than the source for known
voltage, highest range for unknown
voltage)

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Optional Activities

2. Connect the test probe to the terminal of
the source. In case the pointer exceeds
the scale from the meter remove the
probe from connection then set the range
to the higher setting.

o Make sure that tip of the test probe will in
no way contact each other.

o Do not hold the metallic part of the test
probe to avoid electrocution.

3. Take note of the meter reading. This will
be the final reading.

Note: The meter reading will not exceed the
voltage range selected

.

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Optional Activities

Objectives: Using Anemometer

At the end of this practice the learner/trainee will be able to:
o Measure air flow
o Check condition of air conditioning unit

Materials Tools and Equipment:

Equipment - 1 unit
o Digital Anemometer

* - Item is optional

Introduction:

Anemometer is a measuring instrument used to measure air velocity or the speed of air.
Its application in air-conditioning system is to measure the conditioned air blown by the air
conditioning unit. If the measurement is less than the expected air velocity (refer to the unit’s
specification sheet), then the units evaporator, air filter or fan blade may be dirty which causes
restriction to the flow of air. A defective fan motor may also cause this trouble.

Procedure in Measuring Air Velocity

1. Slide the OF/ON/Hold selector to the “ON”
position.

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Optional Activities

2. Slide the Function Selector to the “m/s”,
“km/h” “f/min” or knots position based on

the measuring requirement.

3. Hold the Sensor Handle by hand and let the
Sensor Head placed opposite to the air flow
source.

4. Read the display value. You can slide the
OFF/ON/Hold switch into Hold position to
store the reading value in the display.

5. Compare the value of the reading with the
unit’s specification sheet (unit’s
specification about air throw) to identify
whether the unit is working properly.
The reading and the unit’s air throw must
not have big discrepancy for the unit to be
in good working condition. In case the unit
is not in good working condition, corrective
action should be done (refer to module in
servicing and maintaining window type air
conditioning system).

Below is the sample table describing the specification of Carrier air-conditioning unit
Performance Series.

For both X and Y Series Units: XHC101D XHB123D XHB153D XHD183D YHE243D

Model Installing Window Type Date: Developed Date: Revised Page #
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Optional Activities

Cooling Capacity (Btu./Hr.) 10200 12000/1160 15000/1470 17800/1750 23500/2310
0000
Heating Capacity (Btu./Hr.) 5200
9200/7600 14600/1180 15600/1310 15200/1240
Volts 115 000
EER 10.0
Watts (Cooling) 1020 230/208 230/208 230/208 230/208
Watts (Heating) 1840
Amperes (Cooling) 11.0 10.2/10.2 10.2/10.2 9.7/9.7 8.5/8.5
Amperes (Heating) 16.1
Fuse Size 20 1180/1140 1470/1440 1830/1810 2770/2720
Receptacle Type 2
Fan Speeds (Cooling) 3 3080/2540 4790/3950 5200/4300 5240/4340
Fan Speeds (Heating) 2
Moisture Removal 2.7 5.2/5.5 6.5/7.0 8.3/8.8 12.3/13.3
(Pts./Hr.)
CFM, Hi/Lo 290/170 13.4/12.3 20.9/19.0 23.6/20.9 22.8/20.9
Air Throw (Feet) 34
Air Flow Control 6-Way 20 30 30 30
Ventilation No
Exhaust Yes 4555
Energy Saver Switch Yes
Height 16 3/4 3333
Width 25 3/16
Depth 23 3/4 2222
Depth (without grille) 10 1/2
Chassis Type Slide-Out 3.6 4.3 5.3 7.2
Window Installation Kit Accessory
Weight (net/ship) 110/119 290/170 370/270 420/300 580/420
34 43 49 63
6-Way 6-Way 6-Way 6-Way
No No No Yes
Yes Yes Yes Yes
Yes Yes Yes Yes
16 3/4 16 3/4 16 3/4 17 9/16
25 3/16 25 3/16 25 3/16 26
23 3/4 23 3/4 23 3/4 27 9/16
10 1/2 10 1/2 10 1/2 11 1/2
Slide-Out Slide-Out Slide-Out Slide-Out
Accessory Accessory Accessory Accessory
115/124 121/131 123/132 159/169

Table is taken from: http://www.residential.carrier.com/res/details/0,3041,CLI1_DIV109_ETI8826_MID3774,00.html

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Answer Keys

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Learning Element 1

Answer Key for Self-Check 1

1. D
2. B
3. A
4. B
5. D

Answer Key for Self-Check 2

1. D
2. B
3. A
4. C
5. B

Answer Key for Self-Check 3

1. C.
2. B.
3. C.
4. B
5. A

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Learning Element 3

Answer Key for Self-Check 1

1. The method has many advantages over the surface metal raceway method:
preparation is very easy because it is made of PVC it can be easily cut or bend to
desired shape or turn by applying miter joint.

2. PEC rules and regulations on PVC molding. (any 3 of the following)
a. Size of Conductor. No conductor larger than that for which the
raceway is designed shall be installed in raceways/moldings.
b. Maximum number of conductors in Raceway/Molding. The combined
cross sectional area of all conductors of the interior cross-sectional
area of the raceway or molding.
c. Splices and Taps. Splices and taps shall be made only in junction
boxes.
d. Non-metallic surface raceway/wire moldings and their elbows and
similar fittings shall be so designed that the sections can be
mechanically coupled together without subjecting the wires to
abrasion. Heads of screws shall be flush with the raceway/molding
surface.

Answer Key for Self-Check 2

(Matching Type)

1. C
2. D
3. E
4. A
5. B

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Answer Key for Self-Check 2

(Essay)

1. Under sustained overload conditions, the restricted portions of the fuse element
heat to their predetermined melting point, thus opening and interrupting the flow of
current.

2. Under sustained overload conditions, the trigger spring fractures the fusing alloy
and releases the “S” connector.

3. Edison base plug fuse, Type “S” plug fuse (fustat), Ferrule type cartridge fuse,
Bladed type cartridge fuse and circuit breaker.

4. They both protect the circuit from overloads and short circuit. The thermal type
circuit breaker uses bimetallic strips that heats and bends that releases the
latching mechanism to open the circuit while the electromagnetic type uses coil
that produces strong magnetic field when overload/short circuit occurs to open the
circuit.

Answer Key for Self-Check 4

1. NEMA 3R (rainproof)
2. NEMA 4X (watertight, corrosion resistant)
3. Surface Type (NEMA 1)
4. Eccentric knockout
5. NEMA 1 (indoor)
6. Exterior Surface (NEMA 3R)
7. 2-wire S/N, 1 blade, 1 fuse
8. 2-pole, nonfusible, 2 blades
9. 2-wire, 2 blades, 2 fuses
10. 3-wire S/N, 2 blades, 2 fuses

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