DCC50252- Notes

Lesson Plan W8 W9

W7 Analyze the safety Analyze the safety
procedures in procedures in
Define the handling escalator handling escalator
Transportation & lift & lift
system in high rise
building
Explain the concept
of escalator & lift

Chapter 3.3 Analyze the safety procedures in
handling escalator and lift

3.3.1 Relate safety procedures
during repair works or
maintenance
3.3.2 Identify the best practices in
handling escalator and lift

3.3.1

Relate safety
procedures during
repair works or
maintenance

Safety procedures
during ESCALATOR

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General Working Alone In the Machine Room

GENERAL Procedure of Safety for ESCALATOR
Maintenance

At Site - inform someone in authority on arrival

Site safety risk assessment should be completed
Safety signs displayed

Ensure safety of your colleagues

Report defects or dangerous conditions

GENERAL Procedure of Safety for ESCALATOR
Maintenance

Dismantling or installation carried out in accordance
with company policy

Control the lowering of equipment

Adequate space and protection against live or moving
equipment

Correct storage of materials

Handling and storage of chemicals

WORKING ALONE Procedure of Safety for ESCALATOR
Maintenance

Before start work - Don't work alone in
make sure that the task an unoccupied
can be carried out safely. building
If in doubt contact the Be aware of threat
supervisor of violence
Ensure that others
know where you are
working and keep in
contact

IN THE MACHINE ROOM Procedure of Safety for
ESCALATOR Maintenance

Beware of:- Access:-
Holes in the floor or Guard open
projections access hatched
Overhead beams and keep closed
lower than head height when not in use
Unguarded Close and lock
machinery may move machine rooms
without warning doors when
Exposed electrical unoccupied
commections or cables



Safety procedures
during LIFT repair

works or
maintenance

LIFT All lifts require regular maintenance to
MAINTENANCE ensure smooth and safe operation.
Without adequate maintenance, lifts
would cause inconvenience to users
and expose lift maintenance personnel
to unnecessary risks.
Lift maintenance work generally
covers:

Routine maintenance (lubrication,
cleaning, inspection, alignment, etc.)
Non-routine maintenance
(emergency repair, replacement of
worn or damaged components, re-
calibrating load cell, etc.)

HAZARD CONTROLS

Pinching (e.g. fingers pinched Install emergency
when ropes come into contact stop switch next to
with pulley or sheave) drive sheave.
Install safety
guards for moving
machinery parts.

HAZARD CONTROLS

Electrocution (e.g. worker Use finger safe
coming into contact with non- terminal block with
finger safe terminal block) plastic covering.
Provide clear
markings or labels
on electrical wires
and terminations.

HAZARD CONTROLS

Fall from height (e.g. falling off Adopt a safer
from the top of the lift car to the work position e.g.
bottom of the lift pit) near the centre of
the lift car.
Use fall arrestors
when working at
heights.

HAZARD CONTROLS

Heat stress (e.g. worker Install exhaust fan
perspiring in hot motor room) to cool machinery.
Install ventilation or
ducted HVAC
system in motor
room.
Provide cooling
fans for workers.



3.3.2 The best
practices in

handling escalator
and lift

The best practices in handling lift

Waiting
Boarding
Riding

Exiting
Emergency
Trapped or Stalled

WHILE WAITING FOR THE ELEVATOR

1.Know your destination.
2.Push the elevator call button once for the direction you want

to go in.
3.Look and listen for the signal announcing your car’s arrival.
4.Be aware of health conditions that could contribute to falls or

accidents.
5.Stand clear of the elevator doors and stand aside for exiting

passengers. f) If the arriving car is full, wait for the next car.
6.Don’t attempt to maneuver in or stop closing doors, wait for

the next car.
7.In the event of a fire or other situation that could lead to a

disruption in electrical services, take the stairs

WHILE BOARDING

1.Watch your step – the elevator car may not be perfectly level with
the floor.

2.Stand clear of the doors – keep clothes and carry-ons away from
the opening.

3.Hold children and pets firmly.
4.Passengers nearest to the doors should move first when the car

arrives.
5.Push and hold the DOOR OPEN button if doors need to be held

open, or ask someone to push the button for you.
6.Never try to stop a closing door, wait for the next car.
7.Once on board, quickly press the button for your floor and

move to the back of the car to make room for other passengers.

WHILE RIDING

1.Hold the handrail, if available.
2.Stand next to the elevator wall, if

available.
3.Pay attention to the floor indications.
4.If the doors do not open when the

elevator stops, push the DOOR OPEN
button.

WHILE EXITING

1.Exit immediately at your floor. Do not
wait for others behind you.

2.Do not push the people in front of
you when exiting.

3.Watch your step – the elevator car may
not be perfectly level with the floor

WHILE EMERGENCY

1.If the elevator should ever stop
between floors, do not panic. There is
plenty of air in the elevator.

2.Never climb out of a stalled elevator.
3.Use the ALARM or HELP button, the

telephone or the intercom to call for
assistance.

WHILE EMERGENCY

4. Above all, wait for qualified
help to arrive and never try to leave
an elevator that has not stopped
normally.
5. Emergency lighting will come
on in the event of a power failure.

WHILE TRAPPED / STALLED

1.Push the "Door Open" Button - If you are near the
landing the door will open. You can slowly and carefully
step out of the elevator. Be sure to watch your step as
the elevator floor may, or may not, be level with the
landing.

2.Remain Calm - If the door does not open, you are still
safe. Do not try to exit the elevator. Wait for trained
emergency personnel to arrive. Even if the air
temperature feels warm, there is plenty of air circulating
in the elevator and its shaft way

WHILE TRAPPED / STALLED

3. Press the Alarm or Help Button, and use any available communication
systems

Push the alarm button and wait for someone to respond to you.
In newer elevators, there will be a "PHONE" or "HELP" button instead of
an alarm button this will place a call to a party that is trained to take
action (i.e. elevator company, alarm company, etc.). It will give the exact
location of the building and elevator you are in.
Trained emergency personnel will answer the call for service within
several minutes. Some elevators have a two-way speaker system or
telephone that will allow for communication between you and the building
or rescue personnel.
Do not be alarmed if you cannot be heard or if the phone does not work.
Some phones are designed to only receive calls.
Trained personnel should call when they arrive at the building.

REMAIN CALM

Relax, and do not try to extract yourself from
the elevator

Never try to exit a stalled elevator car. It is
extremely dangerous. always wait for trained
emergency personnel.
Your best course of action is to relax, get
comfortable, and wait for professional
assistance.
You may be inconvenienced but you are safe.

The best practices in handling
ESCALATOR

1.Do not TAKE...
a.Baggage trolleys, hand trolleys or similar items
b.Baby carriages, wheelchairs or similar items
This may lead to accidents such as falling off or slipping from escalator

1.Do not try to TRAVEL in the opposite direction
2.Do not SIT on the escalator step. It may cause serious injury
3.Do not TOUCH the step (moving path), comb, skirt guard panel or handrail inlet.

This may lead to serious injury such as the hang may becoming entangled
4.Do not PLACE any package on the moving steps, handrail, deck board or landing

plate
5.Do not LEAN OVER the side of the handrail as it may cause serious injury

especially at the escalator intersections.
6.Do not RUN at the escalator as it can lead an accident
7.Do not PLAY near the escalator
8.Do not USE escalator in the event of FIRE
9.Do not USE escalator when it is NOT IN OPERATION
10.Keep away your FEET away from the skirting or yellow strips to avoid getting your

feet caught



THANK YOU

REVISION

TEST 1: CHAPTER 1, 2 & 3

Chapter 1:
Apply the safety procedures, rules and regulations for
electrical installation system

Explain the safety procedures based on MS IEC standard
Apply the safety procedures, rules and regulations

Chapter 2:
Explain the fire safety and prevention system

cause and fire spreading
fire prevention
classes of fire
Identify fire appliance symbols

Chapter 3:
Analyse the safety procedures in handling escalator and lif

DCC 50252

AIR
CONDITIONING
SYSTEM

Mdm Adilen @ Lucia bt Suil
Lecturer
Dept. of Civil Engineering
POLISAS

CLO 1 : COURSE LEARNING OUTCOME
CLO 2 :
CLO 3 : choose appropriate building services system with consideration of safety
procedures, rules and regulations by the authority

identify building services system with consideration of the
environmental impact
display teamwork in completing a case study of a building services system

4.1 4.2 4.3

DEFINE THE USE OF APPLY THE PROCESS IDENTIFY THE EFFECTS
THE AIR CONDITIONING OF THE AIR OF AIR CONDITIONING
SYSTEM TOWARDS THE
SYSTEM CONDITIONING SYSTEM
ENVIRONMENT

4.1: DEFINE THE USE OF THE AIR
CONDITIONING SYSTEM

4.1.1. 4.1.2

Describe the basic Identify the cycles and its
function of air conditioning
principles of the air
system
conditioning system

WHAT IS AIR CONDITIONING

Conditioner Air Conditioning

Conditioner is usually the second A system used to cool down the
step to hair washing after hair temperature in an inside space by
shampoo
removing the existing heat and
moisture from the room

4.1.1 Air conditioning, often abbreviated as A/C or
AC, is the process of removing heat and
BASIC PRINCIPLE controlling the humidity of air in an
OF AIR enclosed space to achieve a more
CONDITIONING comfortable interior environment.
SYSTEM
4 methods of treatment for removing heat
are as below:-

CONTROL CONTROL AIR AIR
TEMPERATURE HUMIDITY VENTILATION PURIFIER

CONTROL
TEMPERATURE

Air temperature is controlled by
heating or cooling the air
(technically means the removal of
heat, in contrast to heating, the
addition of heat).

CONTROL
HUMIDITY

Air humidity, the water vapor
contents of the air, is controlled
by adding or removing water
vapor from the air.

AIR VENTILATION

Air motion refers to air velocity
and to where the air is distributed.
It is controlled by appropriate air
distributing equipment

AIR
PURIFIER

Air cleanliness or air quality, is controlled
by either filtration, the removal of
undesirable contaminants using filter or
other device, or by ventilation, the
introduction of outside air into the space
which dilutes the concentration of
contaminants. Often both filtration and
ventilation are used in an installation

4.1.2.
THE CYCLES AND ITS
FUNCTION OF AIR
CONDITIONING SYSTEM

Air conditioner in a room or a car works by
absorbing hot air from a particular room,
processing it into itself with the help of a
refrigerant and a series of coils, and then releasing
cool air into the same room where the hot air was
originally collected

4.1.2.
THE CYCLES AND ITS FUNCTION OF AIR
CONDITIONING SYSTEM

AIR CONDITIONING COMPONENTS

01 COMPRESSOR 03 EXPANSION

EVAPORATOR The compressor is CONDENSER The expansion
responsible for valve reduces the
An evaporator is moving the A condenser (or AC
basically a heat refrigerant condenser) is the pressure of the
exchanger coil between the outdoor portion of refrigerant fluid
evaporator and upstream of the
condenser coils an air conditioner or
heat pump that evaporator
02 either releases or
collects heat. 04

EVAPORATOR 1 COOLING COIL Cooling coil is a part of
evaporator
2 HEAT
EXCHANGER where the heat from the area
or item being cooled is
3 AIR FLOW transferred to the refrigerant

4 REFRIGERANT The main purpose of this coil is
FLOW to provide a surface over which
air from the room can flow

At the same time, the cooling
coil provides a passage
through which the refrigerant
flows

EVAPORATOR COMBINATION The combination of warm air
flowing over the cold refrigerant
5 AIR & causes the air to lose heat and
the refrigerant to gain heat
REFRIGERANT
FLOW By supplying a cool surface to
the air, the cooling coil serves
HEAT as heat transfer device

6 TRANSFER

DEVICE

Heat is transferred the air to the coil

7 surface, and then to the refrigerant in the

coil

refrigerant flowIn effect, heat is transferred from

8 the air to the refrigerant through the coil (heat

transfer) surface

COMPRESSOR

What is compressor?

An air conditioner compressor is the
component in the system that raises the
temperature and pressure of the vapor
refrigerant that leaves the evaporator coil

The compressor serves TWO (2) purposes:

Suction

It draws the refrigerant from the cooling coil and forces it into the
condenser
It keeps the pressure at a low level to allow the refrigerant to boil
or vaporize and absorb heat in the process.
Refrigerant boils at a relatively low temperature when the
pressure on the refrigerant is reduced

COMPRESSOR

Discharge

The compressor increase the pressure
of the refrigerant and also increase the
refrigerant vapor temperature
As a result, it is easier for the condenser
to do its job

CONDENSER

A heat exchanged by the where the heat
absorb by the refrigerant is transferred to the
cooler outdoor air or another cooler
substance

The condenser serves TWO (2) important functions
It removes the heat picked up by the refrigerant in
the cooling coil ( evaporator)

It condenses the refrigerant vapor to a liquid

The heat removal and condensing processes can
take place in two ways

Water – cooling process
Air – cooling process

CONDENSER

Water cooling process

- The refrigerant vapor is passed through a
coil that is submerged in a container filled
with water.
- The water supplied to the container is
maintained at a lower temperature than the
refrigerant vapor.
- Heat from the refrigerant is transferred to
the water through the coil walls.
- The water then carries the heat from the
container through a discharge or drain line

CONDENSER

Air-cooling process

The refrigerant vapor is passed
through a fan cooled coil

The air blown over the coil is cooler
than the refrigerant vapor

Thus, the vapor gives off heat to
the air through the coil walls.

The air is then blown to the
outdoors and the heat is dissipated
in the atmosphere

Continue....