Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
103 Cards in this Set
- Front
- Back
- 3rd side (hint)
|
Copper tubing can only be joined by |
Flaring Brazed Compression |
|
|
|
What type copper tube can be used underground max |
Type K Type L & G coated with PVC |
|
|
|
Hoses must have a minimum pressure rating of |
350psi |
|
|
|
Max length of hose (permanent) is |
10ft |
|
|
|
Min length of hose on a construction heater is _____ and a max length of______ |
15ft 75ft |
|
|
|
Max length of hose on portable appliance is |
30ft |
Eg. bbq |
|
|
Hoses cannot be passed between rooms True or False |
True |
|
|
|
Hanger space for 1/2 is |
6ft |
|
|
|
Hanger space for 3/4 to 1in is |
8ft |
|
|
|
1-1/4 to 2-1/2 is |
10ft |
|
|
|
Joints over 2in must be |
Welded |
|
|
|
Max length of vented appliance flex connector is |
2ft |
Garage heater |
|
|
Max length of connector unvented appliance is |
6ft |
Dryer |
|
|
Branch outlets must protrude thru walls and ceiling by at least |
1in |
|
|
|
Branch outlet must protrude from floor at least |
2in |
|
|
|
Minimum depth of a dirt pocket |
3in or the diameter of pipe it serves whichever is greater |
|
|
|
Can defective piping or tubing be used |
No |
|
|
|
Street fittings can be used True or False |
False |
|
|
|
A union or swing joint maybe installed in a concealed space True or False |
False |
|
|
|
Minimum depth of a buried gas line is |
15in |
|
|
|
How far must a commercial gas line be buried under a driveway or parking lot |
24in |
|
|
|
Gas lines covered with more than 25ft of concrete or pavement requires a |
Vent/inspection point |
|
|
|
Commercial gas lines need to be identified by |
Painted yellow Marked every 20ft |
|
|
|
Copper tubing must be marked every |
6ft |
|
|
|
Gas cocks must be installed |
On final drop or riser as close as possible to the appliance |
|
|
|
on a residential gas line the gas cock may be located up to a max _____ft but it must be accessible |
50ft |
|
|
|
Gas SO valves must be located where between two buildings |
At both buildings |
|
|
|
The minimum size of threaded pipe is |
1/2in |
|
|
|
The minimum pressure test is |
15psi for 15min |
|
|
|
The minimum size face on a gauge is |
3in |
|
|
|
For welded pipe the minimum test is |
50psi or 1.5 times max operating pressure for 180min |
|
|
|
After pressure testing the gas line must be purged. When purging a gas line larger than 4in you must use |
Carbon dioxide or nitrogen |
|
|
|
Minimum size fresh air for residential is |
4in dia |
|
|
|
The minimum size of a vent or vent connector is |
3in |
|
|
|
When using ROT the size of vent on a single appliance is |
The same size as the draft hood |
|
|
|
When using a ROT for manifold vent the size of the vent is |
The combined area of all vents A2+B2=sq root C2 |
|
|
|
When sizing a 2psi system size from the meter to where first |
System regulator |
|
|
|
When sizing 2psi system what do you size secondly |
From to the meter to the furthest appliance regulator |
|
|
|
On a 2psi manifold system, size to the system regulator first, then manifold then |
Furthest appliance |
|
|
|
What is the maximum pressure permitted for residential |
2psi |
|
|
|
In a ventilated space you may use a system regulator equipped with a |
Ball check leak limiting device |
|
|
|
The maximum allowable gas vented by a system regulator to a vented space without internal relief is |
1cu ft for propane 2.5 cu ft for nat gas |
|
|
|
Regulators should always be in the vertical plane with the vent |
Pointing down |
|
|
|
For inlet pressures up to 5psi, the discharge set point on the line relief must be no less than |
2 times and no more than 3 times the outlet pressure of the regulator |
|
|
|
Vent terminations must be at least how far from a dryer vent |
3ft |
|
|
|
Vent terminations must be how far from a mechanical inlet |
10ft |
|
|
|
What is the ROT when venting one appliance through a chimney |
One size larger than the appliance outlet |
|
|
|
What is the maximum length of an air supply duct without increasing the size |
20ft |
|
|
|
The maximum pressure drop for a low pressure gas line is |
1in wc |
|
|
|
The maximum pressure drop for high pressure gas line is |
50% of initial pressure |
|
|
|
An outdoor air supply is not required for a single HWT with an input of up to _____ where there are no other appliances requiring air supply |
50mbh |
|
|
|
The ROT for sizing common vent connector is |
A2+B2=C2 Size = sq root C2 |
|
|
|
ROT for sizing two drafthood appliances into a common vent |
100% of largest btu plus 50% of other |
|
|
|
The total vent height must be at least |
10ft |
|
|
|
To size venting only use what rating |
Input |
|
|
|
What venting table is the most economical |
C4 |
|
|
|
If there are a combination of drafthood and fan assist appliances, which should be sized first |
Fan assist |
|
|
|
If a fan assist vent has more than one elbow, derate the “max” from the table by ______% to determine size |
15% |
|
|
|
If a drafthood appliance has more than one elbow, derate the “max” from the table by ____% to determine size |
10% |
|
|
|
If a common vent connector has more than two elbows, derate the CVC by ____% for each additional elbow |
10% |
|
|
|
If the CVC has an offset, derate the “max” from the table by ____% to determine size |
20% |
|
|
|
If corrugated chimney liner is used, derate the “max” from table by ____% |
20% |
|
|
|
The maximum length of a manifold CVC is |
1.5 times the diam of the CVC |
|
|
|
What appliance cannot be vented individually into a chimney |
Fan assist |
|
|
|
When venting a fan assist appliance into a chimney you must also have |
Drafthood appliance venting into chimney |
|
|
|
The smallest allowable size of a chimney is equal to |
4in diam pipe |
|
|
|
The maximum capacity of a chimney is not more than ____% of the input of the appliance |
125% |
|
|
|
A single appliance cannot be connected to a chimney without |
A lateral horizontal offset |
|
|
|
What is the minimum gsg to be used on an incinerator |
20gsg |
|
|
|
What is the minimum gsg for single wall venting under 6in |
28gsg |
|
|
|
The minimum dimension for a vent is ____in but in no case shall the area of the vent be less than the area of a ____in inside diam |
2in 3in |
|
|
|
BH vent must terminate ____in above a roof or ____in above any obstruction within _____in |
18in 18in 18in |
|
|
|
ROT for chimney size. Always size the chimney how many sizes larger than the drafthood or flue collar |
1 size |
|
|
|
A chimney must terminate at least ____ft above a roof or ____ft above any portion within _____ft |
3ft 2ft 10ft |
|
|
|
What tables are to be used for sizing air supply for a type A |
8.1 or 8.2 |
|
|
|
When an appliance is located in an enclosure (type B) a permanent opening of not less than ___in per _____btu shall be installed not more than ____in or less than ____in above the floor |
1in per 1000btu 18in 6in |
|
|
|
When one or more appliances are in an enclosure (type b), an additional opening shall be located as near the ______ as practicable. But in no case _____ than the _____drafthood |
Ceiling Lower Lowest |
|
|
|
An air duct shall terminate within ____ft above and within ____ft horizontally from the burner |
1ft 2ft |
|
|
|
A drafthood or flue collar cannot be reduced except from |
5in to 4in |
|
|
|
Appliances over 400mbh shall be ventilated at the highest point practical but shall not terminate within ____in of a combustion inlet and shall not be smaller than____in |
12in 10in |
|
|
|
Appliances over 400mbh shall have a permanent opening not less than_____in per _____btu upto and including 1000btu |
1in/7000btu |
|
|
|
An appliance over 1000mbh shall have a permanent opening not less than _____in per ____btu for the first 1000mbh plus 1in for every ______btu for the remaining btu |
1in per 7000mbh 1in per 14000mbh |
|
|
|
Power burners should have a permanent opening not less than _____in per ______btu |
1in/30000btu |
|
|
|
A manual damper cannot be used on _______ appliances |
Residential |
|
|
|
What appliance may be installed in a bathroom |
Direct vent |
|
|
|
What is the minimum distance from a building opening of a vent terminal |
12in |
|
|
|
What is the minimum distance from a mechanical air intake of a direct vent terminal |
10ft |
|
|
|
The minimum distance from a direct vent terminal to ground level is |
12in |
|
|
|
The minimum distance between a direct vent terminal and a public sidewalk is |
7ft |
|
|
|
A vent must have two free to air sides and the deck must be at least _____in above the vent |
12in |
|
|
|
If a power vent is installed to a Cat 1 appliance side wall vented, they must be |
Interlocked |
|
|
|
What is the minimum required fixed opening when a automatic damper is installed on appliance with a standing pilot |
20% |
|
|
|
A “tight” building is what type |
Type A |
|
|
|
A “loose” building is what type |
Type B |
|
|
|
Type A building When two types of appliance are in the same enclosed space size the _______ first using table 8.1 and then the combined btu on table 8.2 |
Drafthood |
|
|
|
The maximum temperature of vent gasses allowed into a B vent is |
470F |
|
|
|
What height above a roof must a vent terminate |
2ft |
|
|
|
What is the minimum height above grade for a vent to terminate |
12in |
|
|
|
What is the minimum size vent for a Cat 1 appliance |
3in |
|
|
|
What is the minimum clearance to combustibles for a single wall vent connector |
6in |
|
|
|
What is the minimum effective vent height for a Cat 1 appliance |
5ft |
|
|
|
Can ROT be applied to two different types of appliances using one B vent connector |
No. Can not combine drafthood and fan assist appliances into a dbl wall vent connector |
|
|
|
What is the minimum size of a ventilation air opening when input exceeds 400mbh |
10% or 10in2 |
|
