Gas RED SEAL Flashcards
what is the maximum pilot input?
3% of total input in BTU
Which procedure would be used to measure manifold pressure?
remove outlet screw, screw in adaptor, connect manometer and turn on gas.
Which appliance listed below cannot use a double-acting barometric damper?
Incinerator
how would a totally blocked vent affect operation of a gas regulator?
the pressure would increase
A combustion fan receives an output signal from a/an:
electronically commutated motor ECM
how is a flare fitting tightened?
wrench and no pipe dope
how is draft verified on a draft hood?
a smoke pen before the draft hood
the expected voltage measured between the “L1” and “R” terminals on a conventional furnace with the secondary voltage grounded to the earth ground would be:
96 volts
Whats is the limit of the CO gas in a dwelling
5 ppm
what is the positive pressure relief setting required for a system supply pressure of 2 psig and an appliance rating of 30” wc?
30 “w.c.
Burner output calculation?
efficiency?
3600/ avg rev per minute x gauge size x CV = Output
% x output - output = efficiency
when can pipe be re-used?
after being inspected, cleaned and tested.
What is the maximum reading on a test gauge for a 50 psig pressure test?
200 psig
which is not allowed to be installed?
a domestic gas fired clothes dryer in a bathroom
LOOK up PROPANE FILL NUMBERS
what would happen if the high limit actuates in a boiler system?
cuts power to gas valve
With direct reference to the electrical measurements below, what device is faulty?
i. open circuit test: 20 mv DC
ii. closed circuit test: 12 mv DC
iii. dropout test 6: mv DC
Thermocouple
what method is used to seal polypropylene pipe?
gasket
what is the maximum distance between identification labels on a residential copper gas line:
6 feet
what is the minimum height a b vent can terminate above a sloped roof with a 16/12 pitch?
6.5 feet
what is the minimum distance required between a direct vent and a combustion air hood?
3 feet
what steps are required to prepare piping for a mechanical compression joint?
cut, ream, bevel, and mark
what schedule pipe is required for liquid propane?
schedule 80
what size outlet is required for an unknown future connection with a 1-1/4” pipe size downstream of a regulator?
1-1/4”
FULL SIZE
what would best describe a document required when adding components to a heating system?
As built drawings
what is the problem if the furnace high limit continues to activate during a call for heat?
Dirty filter
what is the dirt pocket size for a 4000,000 btuh pool heater with a 3” pipe?
2”
what is the minimum time required to pressure test 280 feet of gas line operating at 50 psig?
3 hours
propane tanks are inspected by?
provincial boiler pressure vessels branch
what is the minimum appliance combustible clearance from a source of ignition in a storage garage?
18”
when performing combustion analysis on a natural draft gas fired furnace with an output of 325000 BTUH what is the maximum allowable measurement for CO
400 PPM
when a final gas line is connected to the appliance, what test is done?
dial test for 10 mins
if the fan switch contact(s) do not close during normal operation, which of the following will occur first?
the limit switch will open
what is the mass of 1 cubic foot of propane liquid?
31.7 lbs
a properly joined threaded connection will have how many exposed threads?
2-3
what is the maximum support distance for a 1” horizontal gas line?
8 feet
what is the minimum bury depth for type “L” copper tubing?
15 inches
What is the recommended method to join polyethylene piping at a temperature below -20 deg C?
electro-fusion
how would a partially blocked vent affect the operation of a gas regulator?
slow or sluggish operation
what is the symptom of a lifting pilot burner flame?
too much primary air
what is the C to C measurement required for an expansion joint for 2” rooftop gas piping?
6.5 feet
what is the minimum clearance required from grade to a vent termination below a veranda?
1 foot
what is the maximum length of flex connector for a decorative appliance.
2 foot
what are the steps used when replacing an oil fired furnace with a natural gas furnace?
remove the furnace, cap the oil line, and remove the storage tank
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
transformers are sized by:
the VA rating
what is required for a steam boiler when installed on a non- combustible floor
level flat surface
from the listed materials below, what hazardous material would most likely be a component of older boiler refractory?
asbestos
how could a gas fitter determine if a regulator is not a positive shut off type?
downstream pressure increases
what is the VA limit for a class 2 transformer
100 va
what fitting cannot be used inside a concealed wall?
Union
where should a GF install a LWCO on a hydronic heating system?
in the supply or return piping above the boiler
which of the following materials can be bent?
soft drawn
what must be installed with plastic piping?
a tracer wire ( allows it to be located )
14 gauge
what is required when converting an appliance from natural gas to propane?
change the information on the rating plate
who is responsible to establish and uphold PPE standards?
OH&S
what must be done after clocking an appliance and the clocked input exceeds the manufacturer’s rating?
lower manifold pressure
after the pipe surface has been prepared for electro fusion joining and the virgin surface has been exposed, any surface contamination should be removed with:
70% isopropyl alcohol concentration
what colour wire would normally be 24V power?
red
how is teflon tape applied?
clockwise direction with 50% overlap leaving 2 starter threads
when installing a hydronic heating flow switch in a small diameter piping, what can be done if the shortest sensing paddle is too long to fit in the piping?
trim the paddle to fit
prior to electro fusion of joining HDPE the pipe surface should be prepared by using:
an approved rasp tool
From the list below, which fitting is prohibited?
Continuous thread
what is the set point of a low temp boiler with a cut in temp of 20 deg F
180 deg F
what is the noticeable difference between type “BH” and Type “B” vent?
corrosion resistance
before entering confine space, what must a GF first check:
proper access and egress
the recommended spark gap on an intermittent pilot ignition (IPI) pilot assembly is:
1/8”
what clearance is required between a regulator and an AC unit outside?
10 feet
AC unit counts as a source of ignition
what is the maximuim allowable pressure in a domestic propane gas distribution system?
2 psig
a combustion air supply duct is not required for which of the following?
an 80 MBH direct vent furnace and a 40 MBH heater
when is a permit required to be obtained?
when installing a branch run to a new appliance.
Pick the tool/s and equipment required to ACCURATELY adjust a regulator.
Flat Blade Screwdriver
Multi-meter
Manometer
Thermometer
Flat Blade screwdriver AND Manometer
Would the regulators used on the burners in the SAIT gasfitting shop require the vent to be piped outside?
Yes
No
NO
If a regulator vent becomes blocked or restricted, what would be the expected effect on the operation of the regulator?
Decrease in outlet pressure
Slow / sluggish response to load changes
Increased outlet pressure
No noticeable effect
Slow / sluggish response to load changes
The primary purpose of a regulator is to reduce pressure.
True False
True
When down-stream gas pressure overcomes the force exerted by the regulator spring, would the gas still be able to flow through the regulator?
Yes/No
No
When gas flow is stopped completely by the regulator, this is known as;
Lock-out
Lock-in
Lock-out
Lock-up
Lock-up
How would a ripped or torn regulator diaphragm affect the outlet pressure?
Decrease in outlet pressure
Increase in outlet pressure
No-flow through regulator
None of the above
Increase in outlet pressure
