Sait Racm Rfrg 3Rd: B52 (2023)

Front 1

Dont need to remember actual code numbers

Back 1

Eg. C22.1-02

Front 2

If alberta strays from the B52 national code then it must be more strict, T of F?

Back 2

True

Front 3

Who covers the threshold limits of refrigerant exposure?

Back 3

American conference of Governmental Industrial Hygienists

Annual Manual of

Threshold Limit values

Front 4

What does ASHRAE?

Back 4

ASHRAE (American Society of Heating, Refrigeration and Air-Conditioning Engineers)

Front 5

What is IDLH?

Back 5

IDLH: (Immediately dangerous to life or health); the maximum concentration of a substance from which one can escape within 30 minutes without any escape-impairing symptoms or irreversible health effects.

Front 6

What is LFL?

Back 6

LFL: (Lower Flammability Limit); the minimum concentration of a refrigerant that is capable of propagating a flame through a homogenous mixture of refrigerant and air.

Front 7

What is TLV/TWA?

Back 7

ILV/TWA; Threshold limit value/Time-weighted average; the refrigerant concentration in air during a normal 8 h workday and 40 h workweek, to which nearly all workers can be exposed every day without adverse effect.

Hint 7

ILV/TWA; Threshold limit value/Time-weighted average; the refrigerant concentration in air during a normal 8 h workday and 40 h workweek, to which nearly all workers can be exposed every day without adverse effect.

Front 8

What is a stop valve?

What is a pressure limiting device?

Back 8

(1)Shuts off flow of refrigerant.

(2)high limit shuts off power (first thing that happens)

(3) relieves pressure in the system (second thing that happens)

Front 9

What are the different types of occupancy?

Back 9

4.2.1 General

Refrigeration system locations are classified under occupancy classifications that take into consideration the ability of people to respond to potential exposure to refrigerant (see Clause

4.2.2 to 4.2.8)

4.2.2 Institutional occupancy

The institutional occupancy classification shall apply to that portion of a premises in which persons are Fonfined to receive medical care or treatment, or which persons are held or detained by reason of public or civic duty. Institutional occupancies include hospital, correctional facilities, police stations and courthouses with cells.

4.2.3 Public assembly occupancy

The public assembly occupancy classification shall apply to that portion of a premises in which persons congregate for civic, political, educational, religious, social or recreational purposes.

Public assembly occupancies include armories, assembly rooms, auditoria, ballrooms, broadcasting studios, bus terminals, churches, colleges, courthouses without cells, exhibition halls, fraternity halls, ice rinks, libraries, lodge rooms, mortuary chapels, museums, passenger depots, schools, subway stations and theatres.

4.2.4 Residential occupancy

The residential occupancy classification shall apply to that portion of a building in which sleeping accommodations are provided. Residential occupancies include clubhouse, convents, dormitories, hotels, lodging houses, multi-storey apartments, residences, studios, and tenements. (Tenement; a room or a set of rooms forming a separate residence within a house or block of flats.)

4.2.5 Commercial occupancy

The commercial occupancy classification shall apply to that portion of a premises used for transacting business, rendering professional services, supplying food, drink or other needs and comforts, manufacturing or performance of labor (except as specified in Clause 4.2.6). Commercial occupancies include: bakeries, laboratories, lofts, markets, office buildings, restaurant and stores.

Does Not include single family homes!!!

4.2.6 Industrial occupancy

The industrial occupancy classification shall apply to an entire building or premises, or to that portion of a building used for manufacturing, processing or storage of materials or products.

Industrial occupancies include chemical, food candy and ice cream factories, ice-making plants, meat-packing plants, refineries, perishable food warehouses and similar locations where only authorized persons have access.

4.2.7 Mixed Occupancy

The mixed occupancy classification shall apply to a building in which different parts are occupied or used for different purposes. When a part is cut off from the rest of the building by a tight partition, floors, ceiling and protected by self-closing doors, the requirements for the application type of occupancy specified in Clause 4.2.2 to 4.2.6 shall apply to that part of the building. When the parts are not separated in this manner, the occupancy classification requiring the most stringent requirements shall govern (e.g., the cold-storage spaces in hotels might be classified under industrial occupancy, whereas other portions of the building would be classified under other occupancies).

Note: Occupancy definitions, including fire separation requirements, are usually listed in the applicable provincial code or the National Building Code of Canada, as applicable.

4.2.8 Adjacent locations

Equipment, other than piping, located less than 6.1 m (20 ft.) from any building opening shall be govern by the occupancy classification of the building.

Front 10

What classification of occupancy are hockey arenas?

Back 10

Mixed

The wall that separates the two zones needs to have a 1 hour fire barrier.

Front 11

What refrigerants are allowed in commercial?

Back 11

A-1

Front 12

What is is an adjacent location?

Back 12

A building that is within 20 ft of the main building will recieve the same building designation

4.2.8 Adjacent locations

Equipment, other than piping, located less than 6.1 m (20 ft.) from any building opening shall be govern by the occupancy classification of the building

Front 13

(1) What is 404a, 410a?

(2) What is 290?

(3) what is 717? 718?

Back 13

(1) A-1

(2) Propane? A3

It can be in public spaces (used to be 8oz)

(3) NH3 ammonia is 717 B-2 (best refrigerant in subzero applications)

Water is 718 (best refrigerant known to man)

CO2 is 744 A-1 (second best in sub-zero)

Front 14

Can refrigeration systems be in stairways?

Places that give you access to different to different floors?

Back 14

No you cannot, not even the lines.

4.6.1 Public Stairways

Front 15

Can a refrigeration system interfere with the flow of traffic in a public hallway or lobby?

Back 15

No

4.6.2 public hallways or lobby

Front 16

Can you use copper with ammonia?

Back 16

No

5.4.1

Only use construction materials that do not deteriorate in the presence of refrigerant.

Front 17

Can you use magnesium?

Back 17

No

Front 18

Can you have copper windings and bronze bearings in an ammonia compressor?

Back 18

Yes, as long as it doesn’t come in contact with the ammonia

Front 19

The line set of a system with a pressure vessel shall be tested equal or higher that the pressure vessel? T or F?

Back 19

True

Front 20

Who certifies the pressure vessels?

What code does it comply with?

Back 20

ABSA (Alberta Boiler Safety Association)

B-51

Front 21

What copper tubing can be used?

Back 21

K or L

K is for king

L is for Losers

K is thicker because its king

Front 22

Can you install soft copper above 1 3/8 if it is unprotected (aka outside of the unit)

Back 22

No

Front 23

Can you use compressed air?

Back 23

No

Front 24

Can you use wood as supports for a condenser?

Back 24

No

Front 25

What are the 4 ways that a system can be deemed safe to access?

Back 25

(1) space to walk around on the floor

(2) if it has ladder access then you will need a platform with railings around the equipment OR you need a lift!

(3) back 10ft from any edge

(4) if less than 10ft then you need railings and fall arrest

Front 26

Machinery rooms should allow for free access to all equipment? T or F?

Back 26

True

Front 27

All mechanical room should open outwards?

Back 27

True.

Also…The door should not open into a public space

Front 28

Should a refrigerant leak detector be located in the most likely place where a leak might occure?

Back 28

Yes

Not for Ammonia

Front 29

Can you have an open flame in machinery room with refrigerant?

Back 29

No, unless the refrigerant is CO2.

You can use a contaned flame

Front 30

Machinery room on main floor: Ventilation will turn on if there is a fire for the stairwell.

penthouse machinery room: It can be natural draft.

Below grade machinery room: must have 24hr ventilation

Back 30

True

Front 31

What are the 10 things needed for a class T machinery room?

Ammonia!!

Back 31

a) There shall be no flame producing device or hot surface over 427°C (800°F) permanently installed in the room.

b) The room shall have at least 1 exit door that opens directly to the outer air. Other exist communicating with the building shall be permitted, but shall be through a vestibule equipped with approved self-closing, tight-fitting doors.

c) The machinery room envelope, including any vestibule, shall be of tight construction.

d) The machinery room envelope, including any vestibule, shall have not less than one-hour fire-resistive construction as defined by the National Building Code of Canada.

e) Exterior openings, if present, shall not be under any fire escape or any open stairway. Ammonia is lighter than air. So it would fill up the stairway.

f) All pipes piercing the interior walls, ceiling, or floor of a Class T machinery room shall be tightly sealed to the walls, ceiling or floor through which they pass.

g) Air duct passing through a Class T machinery room shall be of tight construction and shall have no openings in such rooms.

h) Remote pilot control of the mechanical equipment in the machinery room shall be located immediately outside the machinery room and shall be provided solely for shutting down the equipment in an emergency. Ventilation fans shall have a control switch on a separate circuit located immediately outside the machinery room, and shall be permitted to run as long as power is available.

i) An independent mechanical ventilation system shall be provided as specified in Clause 6.2.5.5. In basements, the ventilation system shall be operated continuously. All locations shall be equipped with a vapour detector that shall automatically start the ventilation system and actuate and alarm at the lowest practical detection levels not exceeding the concentration limits specified in item (c)(iii) of Clause 4.5.2 or 300 ppm for ammonia. The vapour detector shall also initiate a supervised alarm so that corrective action can be initiated.

j) When refrigerants of groups A2, A3, B2 other than ammonia and B3 are used, the machinery room shall conform to the requirements for Class 1, Zone 2 locations as defined in the Canadian Electrical Code, Part 1.

Front 32

Can you put refrigerant lines in a stairwell or any shaft that has moving objects?

Back 32

No

Or has openings to living quarters or main exits.

Front 33

Pressure limiting device on a system with less than 22 lbs?

Back 33

If its less than 22 lbs and is factory sealed then you dont need one on a A1 refrigerant.

Front 34

Systems operating above atmosphere and contains over 400 lbs will need what kind of relief valve?

Back 34

Must be discharged outside of the building envelope

Front 35

Who made the “classification of refrigerant chart?

Ex: A1 is for commercial applications

Back 35

ASHAE

Front 36

What are pressure relief valves rated in for refrigerants?

Back 36

Lbs of dry air per minute

Front 37

What is the maximum oxygen percentage of a gas that can be used for pressure testing?

Back 37

20%

Atmospheric air has 21% percent. So no using air compressors.