appliances Flashcards
Any gas appliance component, equipment, or accessory must be approved by:
the ULC, CGA, and the CSA
Before installing a used appliance you should:
inspect it and approve it as good as new
when converting appliances and you do not have the manufacturer’s instructions
you should get permission prior to starting
When a space heater is installed in a sleeping room it shall:
have an effective vent AND
have a 100% shut-off AND
have a temperature control
A space heater installed in a bathroom:
shall be of the sealed combustion chamber type
this means dircet vent. sealed combution and vented seperately
Which of the following should be considered when installing an appliance?
Is it a suitable appliance for the job? AND
Has it been approved? AND
Is it the proper gas for the rating plate?
Permission must be obtained from the enforcing authority before:
you do any job or operation that is contrary to the B149 codes
A vented furnace must be:
a) connected directly to the piping system AND
b) installed as close as practical to the chimney
When connecting an unvented appliance to the piping system with a flexible metallic connector you should:
place the appliance close to the outlet
A residential furnace used for construction heat:
requires approved means of support AND
has to have the supply and return connections ducted AND
needs a thermostat in the area that it is heating
All appliances:
need a specific clearance from combustibles
Wherever an appliance is installed, an access opening shall be provided:
24” x 30”
A clear unobstructed passageway to all appliances shall be provided at a minimum size of:
36” x 36”
All appliances installed 10 ft. or more above a floor shall be provided with:
a safe and adequate means of access
When a service water heater is installed in a bathroom:
it must be of the direct-vent type
Boilers installed in domestic residences must conform to:
Provincial boiler and pressure vessel regulations
Installation requirements for a commercial clothes dryer differ in what way from domestic clothes dryer:
clearance to combustibles from the machine
A standard residential water heater shall have a clearance from combustibles all around of:
2”
A counter flow or down flow furnace differs from a horizontal furnace:
in the position of the hot air plenum
If a horizontal furnace is installed in an attic it must have:
a permanent access way
A heating boiler requires________________ minimum service clearance in front:
24”
Most vented appliances must have how much clearance from combustibles around the sides?
6”
Which of the following electrical circuits are found as a part of a gas appliance automatic control system:
series circuit AND
parallel circuit AND
series parallel circuit
A closed circuit is one that:
allows current to flow
The minimum clearance allowable on the control side of a domestic heating appliance is:
24”
Appliances connected for use outdoors shall:
be approved for outdoor use
Appliances installed in hazardous locations shall:
be approved for installation in hazardous locations
After installing an appliance, the gas code requires that:
the customer be instructed in its operation
Which of the following is the correct formula for verifying an input rate using a gas meter:
secs. Per hr. divided by sec. Per rev. times the dial size
A turn down test checks:
the safe operation of the pilot
The match test (or smoke test) proves the operation of:
the vent
“High Input” appliances are any appliances with an input rate in excess of:
400,000 BTUH
Which of the following should not be present in the flue gases of an appliance:
carbon monoxide
Large capacity appliances have their burners adjusted according to the:
flue gas analysis
Any used appliances that are installed must;
be approved by the installer
To determine the safe operation of the heat exchanger of an appliance you would perform:
a sulphur test
Damaged appliances must have the approval of _________________________ before installation:
the enforcing authority
Electrical power for us in a gas appliance is supplied by:
thermocouples AND
thermopiles AND
transformers
After converting an appliance you should:
inform the customer in writing about disconnecting the original fuel
Should you find that an appliance is too small for its intended purpose, which of the following should you do?
Change the appliance.
A domestic range requires a minimum clearance of __________________ from the cooking surface to combustible materials:
30”
A 100% shut-off:
shuts-off all the gas to an appliance
All the control wiring must:
be installed in accordance with an approved wiring diagram
A space heater:
does not require ducts
Which of the following appliances may require a non-combustible floor or base?
a) A residential boiler.
b) An upflow furnace.
c) A horizontal furnace.
d) a) and c) above
a residential boiler
The minimum clearance to combustibles above a free standing space heater is:
36”
Which of the following would never be used in the installation of a moisture exhaust duct?
Sheet metal screws.
An instantaneous water heater:
has no storage capacity AND
uses water flow rate to control gas flow AND
requires more clearance to combustibles than a tank type
An infrared heater with a listed clearance of 6’ is to be installed in a public garage with a door height of 10’. What is the minimum height it could be installed above the floor?
16’
An infrared heater uses what principle(s) to transfer the heat from the heater to the objects to be heated?
Radiation.
A direct-fired makeup air heater cannot be installed in:
a space that does not have an exhaust fan
A stationary gas engine must have the exhaust connected to a:
separate high temperature chimney or exhaust
An incinerator has to be installed with a “single-acting” draft regulator because:
the flue gas may contain smoke and odors
A construction heater may be repaired and maintained by:
the qualified gasfitter
How does carbon dioxide generator differ from a standard gas heater?
In the venting system.
A gas-fired water heater must have which of the following?
An effective vent.
A swimming pool heater can only be installed:
on a non-combustible base
Which of the following would you NOT find in an IPI system?
a thermocouple
In a building with only a crawl space, which of the following furnaces would it be best to install?
A counterflow furnace.
Commercial kitchen appliances require:
the fire extinguishing system to be interlocked with the gas supply
when installing a pool heater what is the minimum it must be isntalled away from any property line
18” 450mm
Identify four types of forced air furnace designs based on air flow across the heat exchanger.
Horizontal, Up-flow, Counter-flow and High-boy
Identify the correct statement that describes at least one difference between a low temperature radiant heater and an infrared heater.
Low temperature radiant heaters are vented
Which statement below describes one difference between a pool heater and a boiler.
Pool heaters have a low-temperature by-pass
Unit heaters can be fitted with ductwork to distribute heat evenly.
false
An appliance that has a sealed combustion chamber and takes air supply and discharges flue gas directly to outdoors can be defined as;
direct vented
An appliance that discharges flue gas directly into building is identified as;
Direct fired
What is the main difference between a “heater” and a “furnace”?
furnace supplies heat to an entire house
AND
A heater supplies heat for one room only
Which furnace below would best be suited for buildings with crawlspace or slab-on-grade installation?
Up-flow
Low-boy
Down-flow
Floor furnace
down flow
Which term below describes the duct/s connecting the supply and return air to furnace?
Plenum
tests that are necessary to prove that a new conventional gas water heater is in safe working order.
turndown
dropout
close circuit
open circuit
manifold pressure
match
If you converted a house from propane to natural gas, what do you have to do with the original form of energy?
Advise the user of the appliance, at the time of installation or conversion, to have the former form of energy either removed or left safe and secure from accidental activation.
What is the minimum clearance to combustibles from the front of a boiler?
48”
A downflow furnace that has a downward warm-air discharge and is marked “FOR INSTALLATION ON NONCOMBUSTIBLE FLOORS ONLY” shall be provided with;
The manufacturer’s certified base
Why is it that a conventional domestic water heater cannot be installed in a bathroom?
The humidity in the combustion air will cause rusting and deterioration of the heat exchanger
AND
The exhaust fan can create negative pressure and cause flue gas spillage
What kind of gas water heater could you install in a bathroom or bedroom?
Direct vent
When if ever, would you have to install a combustion air duct to serve a gas fireplace?
Direct vent only
what is required when installing a unit heater in a residential garage?
Min. 8’ above floor / unprotected
AND
Supported with metal hangers
AND
Min. 18” above floor to source of ignition
What is the minimum clearance to combustibles above a free-standing space heater?
36”
What is the minimum clearance to combustibles above a residentl kitchen range?
30”
What is the best location for a level when leveling a commercial range?
On the rack inside the oven
Can a properly installed approved quick disconnect be used for hooking up a domestic dryer?
no
If you can use approved gas hose to connect a domestic natural gas barbecue, can an approved hose be used to connect a residential dryer?
no
Can a gas fireplace be installed in a bedroom?
Direct vent only
What is the minimum dimension a DFMAH can be from the edge of a roof?
6 foot
What device also must be installed in conjunction with a DFMAH?
Exhaust Fan
Before the fan can operate in a DFMAH, what must be proven?
The louvers are fully open
What must be done to the gas supply that feeds appliances in a commercial kitchen installation?
Gas valve has to be manual reset
AND
Interlocked with the fire suppression system
What is the combustible clearance from the sides of a residential under-fired hot water tank?
2”
A unit heater must be installed;
a minimum 8’- 0’ above the floor
AND
a minimum 4’- 0” above the floor
AND
with a clearance of 18” from sides, top and bottom
An appliance installed in a storage garage must be installed so that any source of ignition from that appliance be at least;
18” above the floor
An appliance installed in a service garage must be installed so that any source of ignition from that appliance be at least;
54” above the floor
What is an ECO?
Energy Cut Off
When using automatic louvers for combustion air supply to an appliance they must;
be interlocked with the main gas valve
The low water cutoff safety switch on a steam boiler is used to control the;
the gas valve to the main burner
A snap disc high limit on a residential water heater may;
only be replaced with a unit with the same settings
If the temperature on a forced air furnace reaches 280° F the most apparent problem is;
the high limit
How much propane gas will be required to raise the temperature 60 Imperial gallons of water from 40°F to 150°F in a water heater that is 50% efficient?
FIND THE MATH FOR THIS
52.8 CF
An ECO should be wired to control the;
pilot safety valve
Safety devices that control the same final control element (a load or output device), on a ladder diagram are generally wired in ______________ with each other.
A series
A Category IV appliance operates with a _____________ vent static and a flue loss of ________ than 17%.
positive …. less
Deviation or postponement of the B-149.1-10 code, you must obtain permission from the authority having jurisdiction (Municipal Safety Services) in writing upon completion the work.
False
The minimum service clearance for most gas fired appliances is;
24”
An outdoor appliance must be installed on a concrete base extending _________ beyond all sides of the appliance and the top of base must be at least ________ above finished grade.
6 inches and 2 inches
A residential heat exchanger can be permanently repaired provided you have written permission from the authority having jurisdiction.
False
A residential gas range requires a combustible clearance of _________ above the cooking surface.
30”
A residential under-fired hot water tank requires _________ combustible clearance on all sides.
2”
A tube-type radiant heater is considered to be _____ intensity.
Low
Swimming pool heaters that are installed outdoors must have the flue discharge at least _______ from any building opening.
10’
The minimum length of a hose used to connect a portable construction heater is;
15’
A residential range may be connected to the building supply piping with a ______ corrugated metal connector.
6’
A room heater requires a combustible clearance of _______ from the front.
24”
Which vent type is approved for use with a category I recessed wall furnace?
Type - BW
Who is responsible for instructing the customer on the safe operation of an appliance?
the installer of the appliance
What is the minimum distance between a gas clothes dryer vent and a regulator vent?
3’ (1 m)
Which room is not suitable for the installation of a gas range?
a bedroom
Which type of heater is acceptable for installation in a bathroom?
direct vent type
Which category of appliance condenses the water vapour in the flue gas?
Category IV
What is required when an appliance has been damaged by flood or fire?
Have the appliance inspected by an authorised agency.
What must be done when installing a certified gas log into a wood-burning fireplace?
Permanently open the fireplace chimney damper.
What is the minimum clearance required above a gas range when the combustibles are protected with insulating board?
24” (600 mm)
How was the efficiency of central heating appliances increased to mid-efficiency?
The heat exchanger was redesigned.
What should be done with the condensate that forms in the venting system of a Category III appliance?
The water should be neutralized and directed to a drain or sewer.
What is meant by the term recycling control?
The control has more than one trial for ignition.
On a direct-spark ignition system, what happens after the module conducts the safe-start check?
The spark and the main burner gas are turned on.
Why have flame conductivity systems not been used for proving the flame?
The system will not distinguish between a flame and a short to ground.
What is the importance of the ladder diagram?
It shows how the appliance works for troubleshooting.
Aspirated burners require:
a forced draft fan.
The induced draft fan is used on mid-efficient appliances to:
draw the products of combustion through the heat exchanger.
Radiant surface tube heaters:
often use reflector plates above them to reflect heat where needed.
In nozzle mixing burners:
the air and gas are kept separate throughout the burner and mix at the outlet.
What type of efficiency is used to describe the overall efficiency of an appliance?
annual fuel utilization efficiency
Before the gasfitter leaves any gas appliance they have worked on, they must ensure:
the operating instructions and wiring diagrams are with the appliance.
AND
the appliance is operating safely under all rates of firing.
AND
all safety and limit controls are operating normally.
Which combustion chamber designs is not suitable for conversion?
revertible
Who is responsible for instructing the customer on the safe operation the appliance?
the installer of the appliance
What is the minimum service clearance of all appliance from the top side or bottom where service could be necessary?
24”
what is the minimum clearance distance from the front of a boiler?
48”
