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115 Cards in this Set
- Front
- Back
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Where must pilot burners be located |
So that it can satisfactorily ignite the main burner under all conditions and not impinge the thermoelectric device(180 sec) |
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What are the characteristics of a continuous pilot |
A pilot that burns 24/7 without turn down regardless whether the main burner is fired or not |
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Characteristics of expanding pilot |
On standby. The flame is small when there's a call for heat pilot increases to ignite the main burner gas increases the flow remains throughout the main burner cycle |
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What is the maximum gas consumption of the intermittent or interrupted pilot |
5% the appliance input |
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What is the maximum gas consumption of a standing pilot |
3% of the appliance input |
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What material are pilot burners typically made of |
Nickel for natural gas brass or brown for propane |
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Characteristics of a post aerated pilot |
Has no mixing tube and entrains air past the pilot flame ( the most common pilot in residential appliances) |
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Characteristics of aerated pilot burner |
Has primary air entrained creating a blue flame |
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Characteristics of a interrupted pilot |
Pilot is lit on call for heat extinguishes after lighting the main burner |
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Characteristics of an intermittent pilot |
The pilot is lit on a call for heat and remains on throughout standby. Extinguished when the call for heat ends |
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What is the function of a pilot burner |
To light the main burner safely at all times under any condition |
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Tubing fittings shall be rated for |
125 PSIG If above 125 must be rated for 250 PSIG |
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Hangar spaces 1/2 inch to 2 and 1/2 |
1/2" or less 6' 3/4-1" 8' 1-1\4-2-1/2" 10' |
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Can a defective residential heat exchanger be temporarily |
Yes with approval from Authority having jurisdiction and must be replaced as soon as possible |
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When gas pressure is greater than the appliance requirements what must you do to correct the issue |
Install an appliance regulator |
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What is the smallest threaded pipe that may be concealed |
Half inch |
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Unthreaded pipe is smaller than 1/2 inch what must you do |
The pipe must be such 80 |
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When using valuable bushings to reduce you must |
Reduce 2 pipe sizes |
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Gas hoses must be rated for |
350 PSIG |
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What material must gaskets be made of |
Neoprene |
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Fire suppression systems for commercial kitchens equipment without a flame Safeguard protection require |
Interlocking between fire suppression activation and gas supply shut off |
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Minimum bury depth for a gas line in residential |
15 in |
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Minimum very depth for gas line in a commercial |
24 in |
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How do you size a dirt pocket |
Minimum 3 inch or the diameter of the pipe that serves either the diameter of piping being served or two in whichever is less |
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In commercial how far apart can identification for gas line be |
20' |
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Pe pipe max temp |
122°f |
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What is the temperature that you fuse PE pipe at |
500°f |
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Max length for a hose on a permanent installation |
10 ft |
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Max length for a hose on a portable Appliance |
30 ft |
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Min and Max length for a hose on a construction heater |
15 feet and 75 feet |
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Max length for a flex connector |
6 feet |
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Can a high temperature limit control on a boiler be temporarily bypass when a new one is on backorder |
Know this practice is prohibited |
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What is the minimum distance between the floor of a residential garage and a component in an appliance capable of igniting A flammable vapour |
18 in |
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Which type of wire diagram shows scale representation of the controls |
A ladder diagram |
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What is the minimum dimension of a vent or chimney if it is not round |
2 in |
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What is required to connect a infrared tube heater to the gas line |
Type 1 gas hose 36in long plus or minus 6 in |
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What is the purpose of the e c o |
To act as a manual reset high temperature limit control |
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How do you connect your multimeter to a circuit to read the current |
In parallel with the power on |
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What is the purpose of the bypass hole in the excess flow valve |
To allow the valve to return to its open position in the event of a break |
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What is the minimum clearance required for the burner side of a direct vent water heater |
3 in |
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What type of temperature sensor is used in a typical room thermostat |
Bi-metal coil |
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Which type of diagram is best suited to show which wire connects to a particular control |
Connection diagram it will also show the colour code of wire |
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What is the importance of the OPD |
It prevents The Accidental overfilling of a cylinder |
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What type of temperature sensor is used on a thermostatic gas valve |
A liquid bulb |
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What is the minimum unprotected clearance from floor level to a unit heater in a garage |
8 feet |
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What type of damper is allowed for installation on a air supply duct in a dwelling unit |
Certified automatic damper |
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On a construction site what is required to be used with all propane cylinders larger than 1 lb propane capacity |
An excess flow valve |
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What is the principle of operation of a rod and Tube thermostat used on a water heater control |
The tube expands in contacts but the rod does not |
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Where should air supply duct terminate |
2 feet horizontal 1 feet above the burner of the largest Appliance |
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What is the principle of operation of a fluid expansion thermostat |
The fluid expands when heated and closes a valve |
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Which category would an appliance with a draft Hood be |
CategoryI |
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What is the purpose of a bypass on a modulating gas valve |
It keeps a small stable flame on the burner |
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What must be done when installing a certified gas log into a wood burning fireplace |
Permanently open the fireplace chimney damper |
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A vent must terminate |
2 feet above any obstruction within 10 ft |
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How far must a chimney terminate |
3 ft above the roof 2 feet anyting within 10 ft |
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What is the purpose of a heat anticipator |
It shortens the time the gas valve is on |
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Which type of furnace may be serviced but not allowed to be installed |
Floor furnace |
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Which appliance is the only appliance that may be vented using type B W vent |
recessed wall heater |
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How do you take operating pressure |
Downstream of the service regulator and Upstream of the appliance regulator with the appliance main burner on |
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How do you take manifold pressure |
Downstream of the appliance regulator with main burner on |
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When looking for volts how do you connect your metre |
Parallel power on |
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How do you connect the metre looking for ohms |
Parallel power off |
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What do you need for a complete circuit |
A switch a load and a power source |
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How do you measure the resistance in a circuit |
Ohm's is the measurement |
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Whenever you are not sure of the voltage and amperage or resistance in the circuit what should you do |
Set the metre to the highest setting and work your way down until you get a reading |
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If the voltmeter is flashing or the letters o l is on what does represent |
The scale has been exceeded |
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On the first stage regulator what is the maximum pressure and what is the maximum pressure for the second stage regulator |
10 psi the first stage 11 inch water column second stage |
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The term inversely proportional means |
As one factor increases the other Factor will decrease |
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Directly proportional means |
That's one factor increases the other Factor will also increase |
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What is the minimum service clearance for a gas Appliance |
Two feet |
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Where in the gas system is aluminum tubing allowed |
To the supply pilot burner only |
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What is the smallest pipe that may be concealed |
Half inch pipe |
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What position should a diaphragm gas valve be installed |
Horizontal pipe with the gas valve head vertical |
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What is the maximum allowable setting for a limit control on a forced air furnace |
250 degrees Fahrenheit |
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What is the minimum clearance to combustibles for a water heater |
2 in |
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What is the minimum size of a vent or vent connector |
Equal to the area of 3 in |
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What is the maximum size of propane cylinder that may be used indoors without needing permission from The Authority having jurisdiction |
5 lb |
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How do you test the limit control on a forced air furnace to ensure that it shuts off |
Fire the furnace stop the airflow through the furnace and allowed to heat up you can do this by putting a piece of cardboard in the filter area |
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Ignition temperature for natural gas |
1200 degrees Fahrenheit |
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Flame temperature for propane |
3500 degrees Fahrenheit |
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Boiling point for propane |
-44 degrees Fahrenheit |
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Boiling point for natural gas |
-258 degrees Fahrenheit |
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What type of gas CH4 |
Natural gas AKA methane |
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Density of water pounds per imperial gallon |
10 imperial gallon |
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Flame temperature for natural gas |
3350 degrees Fahrenheit |
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Liquification ratio foot cubed per gallon for propane |
43.6 |
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Specific gravity for propane relative to water |
0.51 |
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Calorific value for propane |
2500BTU |
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Range of flammability for propane |
2.3 to 9.5% |
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What is C3 h8 |
Propane |
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Tell riffic value BTU per imperial gallon |
109 560 |
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Density of water pounds per foot cubed |
62.4 lb per foot cubed |
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Natural gas range of flammability |
5 to 15% |
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How do you determine the efficiency of an appliance |
Output divided by input |
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Calorific value for natural gas |
1000 BTUs |
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What do you need for complete combustion |
Heat fuel oxygen |
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Ignition temperature for propane |
950 degrees Fahrenheit |
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Liquification ratio foot cubed per foot cubed propane |
270 |
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The minimum size of fresh air intake and duct is |
4 in diameter and must be insulated and have a vapour barrier |
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What is the minimum size of an opening in a screen Louver or grill used for Air Supply |
Quarter inch |
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What is the maximum developed length of an air supply duct allowed without increasing the size |
20 ft |
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Which category would an appliance with a draft Hood be |
Category I |
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What is the pressure in the vent serving in operating category I Appliance |
Non positive |
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Which category of an appliance condenses the water vapour in the flue gas |
Category IV |
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Which type of vent would be normally used with a categoryI Appliance |
Type B vent |
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Who is responsible for instructing the customer on the safe operation of an appliance |
The installer of the appliance |
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What should you do with the manuals that are supplied with new appliances |
Turn them over to the owners of the appliance |
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What is required when an appliance has been damaged by flood or fire |
Have the appliance inspected by The Authority having jurisdiction |
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What is required when an unvented refrigerator is installed inside a dwelling unit |
Carbon monoxide detector |
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How do you take the amperage in a circuit |
Series with the power on |
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1 hp= |
476 watts |
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What type of regulator is required when the outlet pressure exceeds .5psig |
Positive shut-off type |
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De rating a appliance for high altitude |
2000-4500ft 10% Each additional 1000ft over 4500 additional 4% Do each separate on the calculator |
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Clocking meter formula |
Size of proving dial÷number of sec/revolution x3600=cu/hr If u need btu/hr then take the cu/hr and multiply by calorific valve of the gas u are using |
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Thermostat should be installed at what height |
At eye level aka 5ft |
