Red Seal Gas (simplified Q&A's) Flashcards
Fitting that is prohibited
Continuous thread
Set point of low temperature boilers with a cut-in of 20 degrees F?
180 degrees F
Max allowable measurement for CO
400 ppm
Number of expansion loops for 1 1/2” pipe at 250 ft?
2
Pipe reused has to be
Inspected, cleaned and tested
High limit actuates in a boiler system does what?
Cuts power to gas valve
Final test (finish piping) tested for how long?
Test for 10 min
How do you verify draft?
Smoke pen before draft hood
What device is faulty?
Open circuit - 20mV DC
Closed circuit - 12mv DC
Dropout Test - 6mV DC
Thermocouple
How do you convert natural gas to propane gas on an appliance?
Change the rating plate info
Shortest sensing paddle is too long to fit in appliance, what do you do?
Trim the paddle
Max length of flex connector?
2 feet
Storage garage combustable clearance?
18”
Repair garage combustable clearance?
54”
High limit continues to activate when there’s a call for heat, what’s the issue?
Dirty filter
Input exceeds manufacturers rating, what do you adjust?
Lower manifold pressure
How many lbs of propane will a cylinder with a WC (water capacity) of 260 hold at max filling density?
106 lbs
260 x 0.8 = 208 lbs
208 lbs x 0.51 RD = 106.08 lbs C3H8
Method to seal PP pipe
Gasket
With regards to properly threaded connections, how many exposed threads can there be?
2-3
Class 2 Transformer VA rating
100 VA
Max VAC output rating for a Class 2 Transformer
30 VAC
Min VAC output rating for a Class 2 Transformer
24 VAC
Combustion air fan capacity number to remember
1.08
What condition must be met when installing a boiler on a non-combustable floor?
Level floor
Allowable CO concentration in a dwelling?
5 ppm
What causes a lifting flame?
Too much gas pressure and/or too much primary air
What is the pipe schedule used for liquid propane?
Schedule 80
Plastic pipe must be installed with what for underground installations?
Tracer wire (14g)
Max reading on test gauge for a 50 psig pressure test?
200 psig
(6.22.2b)
50 psig x 3 = 150 + 50 = 200 psig MAX range
Material that can’t be “field bent”
Soft drawn
Spark gap for IPI?
1/8”
Thermocouple must be inserted into a pilot flame by how much?
3/8” - 1/2”
Teflon tape applied how?
Clockwise with 50% overlap leaving 2 starter threads (6.9.6)
Flare fitting tightened how?
With a wrench and no pipe dope
Ventilation opening sizing rule
Minimum 10sq.in or 10% of the combustion air opening, whichever is largest
Example of an operating control
Thermostat
Double-acting barometric damper used for what appliance?
Incinerator
Color of wire normally used for 24 V power
Red
Line relief or OPPD sizing method?
100% of largest + 50% of the rest
No relief regulators sizing method?
2 times the total area
What is the dirt pocket size for a 400,000 BTUH pool heater with a 3” pipe?
A) 3”
B) 2”
C) 4”
D) 6”
B) 2”
What would best describe a document required when adding components to a heating system?
A) Mechanical drawing
B) As built drawing
C) Architechual drawing
D) Hydronic drawing
B) As built drawing
A combustion air supply duct is not required for which of the following?
A) A 40,000 BTU power burner water heater and a 45,000 BTU water heater w/ a draft hood
B) A counter-flow furnace
C) An 80 MBH direct vent furnace and a 40 MBH water heater
D) A 60,000 BTU power burner furnace and a 40,000 BTU power burner water heater
C) An 80 MBH direct vent furnace and a 40 MBH water heater
(8.2.3)
An outdoor air supply shall not be required for a single water heater with an input of 50,000 BTUH or less within an enclosure or structure where there are no other appliances that require an air supply.
Max distance between identification labels on a residential copper gas line?
A) 3 feet
B) 4 feet
C) 5 feet
D) 6 feet
D) 6 feet
Prior to electro-fusion joining of HDPE, the pipe surface should be prepared by using what tool?
An approved rasp-type tool (file)
After the pipe surface has been prepared for electro-fusion joining and virgin surface has been exposed, any surface contamination should be removed using;
A) Warm water
B) Scraper
C) Fine-grit sand cloth
D) 70% isopropyl alcohol concentration
D) 70% isopropyl alcohol concentration
What steps are required to prepare piping for a mechanical compression joint?
Cut, ream, bevel and mark
Minimum distance required between a direct vent outlet and a combustion air hood?
A) 8 feet
B) 6 feet
C) 3 feet
D) 10 feet
C) 3 feet (8.14.8g)
What hazardous material would most likely be component of older boiler refractory?
Asbestos (If not shown choose silica)
Propane tanks are inspected by whom?
Provincial Boiler Pressure Vessels Branch - ABSA (Alberta Boilers Safety Association)
Where is the proper installation location of a cooling coil in an up-flow furnace system?
In the discharge plenum, downstream of the heat exchanger
How would a totally blocked vent affect the operation of a gas regulator?
A) Pressure fluctuates
B) Pressure increase
C) Pressure decrease
D) Pressure is hunting
B) Pressure increase
Who is responsible to establish and uphold PPE standards?
OH & S
What is the mass of one cubic foot of propane liquid?
31.7 lbs
(Half of water)
62.4lbs x 0.51 RD = 31.82 lbs/CF
What clearance is required between a regulator and an AC unit outside?
3 feet
Where should a gas fitter install a LWCO on a hydronic heating system?
In the supply or return piping above the boiler
